/**
* 将某个日期以固定格式转化成字符串
*
* @param date
* @return String
*/
public static String dateToStr(java.util.Date date)
{
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String str = sdf.format(date);
return str;
}
/**
* 判断任意一个整数是否素数
*
* @param n
* @return boolean
*/
public static boolean isPrimes(int n)
{
for (int i = 2; i <= Math.sqrt(n); i++)
{
if (n % i == 0)
{
return false;
}
}
return true;
}
/**
* 获得任意一个整数的阶乘，递归
*
* @param n
* @return n!
*/
public static int factorial(int n)
{
if (n == 1)
{
return 1;
}
return n * factorial(n - 1);
}
/**
* 将指定byte数组以16进制的形式打印到控制台
*
* @param hint String
* @param b byte[]
* @return void
*/
public static void printHexString(String hint, byte[] b)
{
System.out.print(hint);
for (int i = 0; i < b.length; i++)
{
String hex = Integer.toHexString(b[i] & 0xFF);
if (hex.length() == 1)
{
hex = '0' + hex;
}
System.out.print(hex.toUpperCase() + " ");
}
System.out.println("");
}
常用的java函数（二) 常用字符串处理
/**
* 分割字符串
*
* @param str String 原始字符串
* @param splitsign String 分隔符
* @return String[] 分割后的字符串数组
*/
public static String[] split(String str, String splitsign) {
int index;
if (str == null || splitsign == null)
return null;
ArrayList al = new ArrayList();
while ((index = str.indexOf(splitsign)) != -1) {
al.add(str.substring(0, index));
str = str.substring(index + splitsign.length());
}
al.add(str);
return (String[]) al.toArray(new String[0]);
}
/**
* 替换字符串
*
* @param from String 原始字符串
* @param to String 目标字符串
* @param source String 母字符串
* @return String 替换后的字符串
*/
public static String replace(String from, String to, String source) {
if (source == null || from == null || to == null)
return null;
StringBuffer bf = new StringBuffer("");
int index = -1;
while ((index = source.indexOf(from)) != -1) {
bf.append(source.substring(0, index) + to);
source = source.substring(index + from.length());
index = source.indexOf(from);
}
bf.append(source);
return bf.toString();
}
/**
* 替换字符串，能能够在HTML页面上直接显示(替换双引号和小于号)
*
* @param str String 原始字符串
* @return String 替换后的字符串
*/
public static String htmlencode(String str) {
if (str == null) {
return null;
}
return replace("\"", """, replace("<", "<", str));
}
/**
* 替换字符串，将被编码的转换成原始码（替换成双引号和小于号）
*
* @param str String
* @return String
*/
public static String htmldecode(String str) {
if (str == null) {
return null;
}
return replace(""", "\"", replace("<", "<", str));
}
private static final String _BR = "<br/>";
/**
* 在页面上直接显示文本内容，替换小于号，空格，回车，TAB
*
* @param str String 原始字符串
* @return String 替换后的字符串
*/
public static String htmlshow(String str) {
if (str == null) {
return null;
}
str = replace("<", "<", str);
str = replace(" ", " ", str);
str = replace("\r\n", _BR, str);
str = replace("\n", _BR, str);
str = replace("\t", " ", str);
return str;
}
/**
* 返回指定字节长度的字符串
*
* @param str String 字符串
* @param length int 指定长度
* @return String 返回的字符串
*/
public static String toLength(String str, int length) {
if (str == null) {
return null;
}
if (length <= 0) {
return "";
}
try {
if (str.getBytes("GBK").length <= length) {
return str;
}
} catch (Exception ex) {
}
StringBuffer buff = new StringBuffer();
int index = 0;
char c;
length -= 3;
while (length > 0) {
c = str.charAt(index);
if (c < 128) {
length--;
} else {
length--;
length--;
}
buff.append(c);
index++;
}
buff.append("
");
return buff.toString();
}
/**
* 判断是否为整数
*
* @param str 传入的字符串
* @return 是整数返回true,否则返回false
*/
public static boolean isInteger(String str) {
Pattern pattern = Pattern.compile("^[-\\+]?[\\d]*$");
return pattern.matcher(str).matches();
}
/**
* 判断是否为浮点数，包括double和float
*
* @param str 传入的字符串
* @return 是浮点数返回true,否则返回false
*/
public static boolean isDouble(String str) {
Pattern pattern = Pattern.compile("^[-\\+]?[.\\d]*$");
return pattern.matcher(str).matches();
}
/**
* 判断输入的字符串是否符合Email样式.
*
* @param str 传入的字符串
* @return 是Email样式返回true,否则返回false
*/
public static boolean isEmail(String str) {
Pattern pattern = Pattern.compile("^\\w+([-+.]\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*$");
return pattern.matcher(str).matches();
}
/**
* 判断输入的字符串是否为纯汉字
*
* @param str 传入的字符窜
* @return 如果是纯汉字返回true,否则返回false
*/
public static boolean isChinese(String str) {
Pattern pattern = Pattern.compile("[\u0391-\uFFE5]+$");
return pattern.matcher(str).matches();
}
/**
* 是否为空白,包括null和""
*
* @param str
* @return
*/
public static boolean isBlank(String str) {
return str == null || str.trim().length() == 0;
}
/**
* 判断是否为质数
*
* @param x
* @return
*/
public static boolean isPrime(int x) {
if (x <= 7) {
if (x == 2 || x == 3 || x == 5 || x == 7)
return true;
}
int c = 7;
if (x % 2 == 0)
return false;
if (x % 3 == 0)
return false;
if (x % 5 == 0)
return false;
int end = (int) Math.sqrt(x);
while (c <= end) {
if (x % c == 0) {
return false;
}
c += 4;
if (x % c == 0) {
return false;
}
c += 2;
if (x % c == 0) {
return false;
}
c += 4;
if (x % c == 0) {
return false;
}
c += 2;
if (x % c == 0) {
return false;
}
c += 4;
if (x % c == 0) {
return false;
}
c += 6;
if (x % c == 0) {
return false;
}
c += 2;
if (x % c == 0) {
return false;
}
c += 6;
}
return true;
}
/**
* 全角字符转半角字符
*
* @param QJStr
* @return String
*/
public static final String QJToBJChange(String QJStr)
{
char[] chr = QJStr.toCharArray();
String str = "";
for (int i = 0; i < chr.length; i++)
{
chr[i] = (char) ((int) chr[i] - 65248);
str += chr[i];
}
return str;
}
/**
* 去掉字符串中重复的子字符串
*
* @param str
* @return String
*/
private static String removeSameString(String str)
{
Set<String> mLinkedSet = new LinkedHashSet<String>();
String[] strArray = str.split(" ");
StringBuffer sb = new StringBuffer();
for (int i = 0; i < strArray.length; i++)
{
if (!mLinkedSet.contains(strArray[i]))
{
mLinkedSet.add(strArray[i]);
sb.append(strArray[i] + " ");
}
}
System.out.println(mLinkedSet);
return sb.toString().substring(0, sb.toString().length() - 1);
}
//过滤特殊字符
public static String encoding(String src){
if (src==null)
return "";
StringBuilder result=new StringBuilder();
if (src!=null){
src=src.trim();
for (int pos=0;pos<src.length();pos++){
switch(src.charAt(pos)){
case '\"':result.append(""");break;
case '<':result.append("<");break;
case '>':result.append(">");break;
case '\'':result.append("'");break;
case '&':result.append("&");break;
case '%':result.append("&pc;");break;
case '_':result.append("&ul;");break;
case '#':result.append("&shap;");break;
case '?':result.append("&ques;");break;
default:result.append(src.charAt(pos));break;
}
}
}
return result.toString();
}
//反过滤特殊字符
public static String decoding(String src){
if (src==null)
return "";
String result=src;
result=result.replace(""", "\"").replace("'", "\'");
result=result.replace("<", "<").replace(">", ">");
result=result.replace("&", "&");
result=result.replace("&pc;", "%").replace("&ul", "_");
result=result.replace("&shap;", "#").replace("&ques", "?");
return result;
}
/**
*判断任意一个整数是否素数
*@paramn
*@return boolean
*/
public boolean isPrimes(int n)
{
for (int i = 2; i <= Math.sqrt(n); i++) {
if(n%i==0)
{
return false;
}
}
return true;
}
常用的java函数（三）数据库连接
/* * Db.java
Created on 2007年8月20日, 上午 8:37
*/
import java.io.*;
import java.sql.*;
import java.util.Properties;
public class Db {
private String driver;
private String url;
private String user;
private String password;
private Connection conn;
private Statement stm;
private ResultSet rs;
public Db(){
this("DBConf.properties");
}
public Db(String conf) {
loadProperties(conf);
setConn();
}
public Connection getConn(){
return this.conn;
}
//handle the properties file to get the informations for connection
private void loadProperties(String conf){
Properties props = new Properties();
try {
props.load(new FileInputStream(conf));
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
this.driver = props.getProperty("driver");
this.url = props.getProperty("url");
this.user = props.getProperty("user");
this.password = props.getProperty("password");
}
//implement the Connection
private void setConn(){
try {
Class.forName(driver);
this.conn = DriverManager.getConnection(url,user,password);
} catch(ClassNotFoundException classnotfoundexception) {
classnotfoundexception.printStackTrace();
System.err.println("db: " + classnotfoundexception.getMessage());
} catch(SQLException sqlexception) {
System.err.println("db.getconn(): " + sqlexception.getMessage());
}
}
public void doInsert(String sql) {
try {
Statement statement = conn.createStatement();
int i = stm.executeUpdate(sql);
} catch(SQLException sqlexception) {
System.err.println("db.executeInset:" + sqlexception.getMessage());
}
}
public void doDelete(String sql) {
try {
stm = conn.createStatement();
int i = stm.executeUpdate(sql);
} catch(SQLException sqlexception) {
System.err.println("db.executeDelete:" + sqlexception.getMessage());
}
}
public void doUpdate(String sql) {
try {
stm = conn.createStatement();
int i = stm.executeUpdate(sql);
} catch(SQLException sqlexception) {
System.err.println("db.executeUpdate:" + sqlexception.getMessage());
}
}
public ResultSet doSelect(String sql) {
try {
stm = conn.createStatement(java.sql.ResultSet.TYPE_SCROLL_INSENSITIVE,java.sql.ResultSet.CONCUR_READ_ONLY);
rs = stm.executeQuery(sql);
} catch(SQLException sqlexception) {
System.err.println("db.executeQuery: " + sqlexception.getMessage());
}
return rs;
}
public static void main(String[] args){
try{
Db db = new Db();
Connection conn = db.getConn();
if(conn != null && !conn.isClosed()) {
System.out.println("連結成功");
ResultSet rs = db.doSelect("select * from content");
while(rs.next()){
System.out.println(rs.getString(1)+":"+rs.getString(2)+":"+rs.getString(3));
}
rs.close();
conn.close();
}
}catch(SQLException e) {
e.printStackTrace();
}
}
}
常用的java函数（四）中文转拼音
/**
* <p>
* Title:
* Description:中文转换为拼音
* @version 1.0
*/
public class ChineseSpelling {
private static int[] pyvalue = new int[] { -20319, -20317, -20304, -20295, -20292, -20283, -20265, -20257, -20242, -20230, -20051, -20036, -20032, -20026, -20002, -19990, -19986, -19982, -19976, -19805, -19784, -19775, -19774, -19763, -19756, -19751, -19746, -19741, -19739, -19728, -19725, -19715, -19540, -19531, -19525, -19515, -19500, -19484, -19479, -19467, -19289, -19288, -19281, -19275, -19270, -19263, -19261, -19249, -19243, -19242, -19238, -19235, -19227, -19224, -19218, -19212, -19038, -19023, -19018, -19006, -19003, -18996, -18977, -18961, -18952, -18783, -18774, -18773, -18763, -18756, -18741, -18735, -18731, -18722, -18710, -18697, -18696, -18526, -18518, -18501, -18490, -18478, -18463, -18448, -18447, -18446, -18239, -18237, -18231, -18220, -18211, -18201, -18184, -18183,
-18181, -18012, -17997, -17988, -17970, -17964, -17961, -17950, -17947, -17931, -17928, -17922, -17759, -17752, -17733, -17730, -17721, -17703, -17701, -17697, -17692, -17683, -17676, -17496, -17487, -17482, -17468, -17454, -17433, -17427, -17417, -17202, -17185, -16983, -16970, -16942, -16915, -16733, -16708, -16706, -16689, -16664, -16657, -16647, -16474, -16470, -16465, -16459, -16452, -16448, -16433, -16429, -16427, -16423, -16419, -16412, -16407, -16403, -16401, -16393, -16220, -16216, -16212, -16205, -16202, -16187, -16180, -16171, -16169, -16158, -16155, -15959, -15958, -15944, -15933, -15920, -15915, -15903, -15889, -15878, -15707, -15701, -15681, -15667, -15661, -15659, -15652, -15640, -15631, -15625, -15454, -15448, -15436, -15435, -15419, -15416, -15408, -15394,
-15385, -15377, -15375, -15369, -15363, -15362, -15183, -15180, -15165, -15158, -15153, -15150, -15149, -15144, -15143, -15141, -15140, -15139, -15128, -15121, -15119, -15117, -15110, -15109, -14941, -14937, -14933, -14930, -14929, -14928, -14926, -14922, -14921, -14914, -14908, -14902, -14894, -14889, -14882, -14873, -14871, -14857, -14678, -14674, -14670, -14668, -14663, -14654, -14645, -14630, -14594, -14429, -14407, -14399, -14384, -14379, -14368, -14355, -14353, -14345, -14170, -14159, -14151, -14149, -14145, -14140, -14137, -14135, -14125, -14123, -14122, -14112, -14109, -14099, -14097, -14094, -14092, -14090, -14087, -14083, -13917, -13914, -13910, -13907, -13906, -13905, -13896, -13894, -13878, -13870, -13859, -13847, -13831, -13658, -13611, -13601, -13406, -13404,
-13400, -13398, -13395, -13391, -13387, -13383, -13367, -13359, -13356, -13343, -13340, -13329, -13326, -13318, -13147, -13138, -13120, -13107, -13096, -13095, -13091, -13076, -13068, -13063, -13060, -12888, -12875, -12871, -12860, -12858, -12852, -12849, -12838, -12831, -12829, -12812, -12802, -12607, -12597, -12594, -12585, -12556, -12359, -12346, -12320, -12300, -12120, -12099, -12089, -12074, -12067, -12058, -12039, -11867, -11861, -11847, -11831, -11798, -11781, -11604, -11589, -11536, -11358, -11340, -11339, -11324, -11303, -11097, -11077, -11067, -11055, -11052, -11045, -11041, -11038, -11024, -11020, -11019, -11018, -11014, -10838, -10832, -10815, -10800, -10790, -10780, -10764, -10587, -10544, -10533, -10519, -10331, -10329, -10328, -10322, -10315, -10309, -10307,
-10296, -10281, -10274, -10270, -10262, -10260, -10256, -10254 };
private static String[] pystr = new String[] { "a", "ai", "an", "ang", "ao", "ba", "bai", "ban", "bang", "bao", "bei", "ben", "beng", "bi", "bian", "biao", "bie", "bin", "bing", "bo", "bu", "ca", "cai", "can", "cang", "cao", "ce", "ceng", "cha", "chai", "chan", "chang", "chao", "che", "chen", "cheng", "chi", "chong", "chou", "chu", "chuai", "chuan", "chuang", "chui", "chun", "chuo", "ci", "cong", "cou", "cu", "cuan", "cui", "cun", "cuo", "da", "dai", "dan", "dang", "dao", "de", "deng", "di", "dian", "diao", "die", "ding", "diu", "dong", "dou", "du", "duan", "dui", "dun", "duo", "e", "en", "er", "fa", "fan", "fang", "fei", "fen", "feng", "fo", "fou", "fu", "ga", "gai", "gan", "gang", "gao", "ge", "gei", "gen", "geng", "gong", "gou", "gu", "gua", "guai", "guan", "guang", "gui", "gun",
"guo", "ha", "hai", "han", "hang", "hao", "he", "hei", "hen", "heng", "hong", "hou", "hu", "hua", "huai", "huan", "huang", "hui", "hun", "huo", "ji", "jia", "jian", "jiang", "jiao", "jie", "jin", "jing", "jiong", "jiu", "ju", "juan", "jue", "jun", "ka", "kai", "kan", "kang", "kao", "ke", "ken", "keng", "kong", "kou", "ku", "kua", "kuai", "kuan", "kuang", "kui", "kun", "kuo", "la", "lai", "lan", "lang", "lao", "le", "lei", "leng", "li", "lia", "lian", "liang", "liao", "lie", "lin", "ling", "liu", "long", "lou", "lu", "lv", "luan", "lue", "lun", "luo", "ma", "mai", "man", "mang", "mao", "me", "mei", "men", "meng", "mi", "mian", "miao", "mie", "min", "ming", "miu", "mo", "mou", "mu", "na", "nai", "nan", "nang", "nao", "ne", "nei", "nen", "neng", "ni", "nian", "niang", "niao",
"nie", "nin", "ning", "niu", "nong", "nu", "nv", "nuan", "nue", "nuo", "o", "ou", "pa", "pai", "pan", "pang", "pao", "pei", "pen", "peng", "pi", "pian", "piao", "pie", "pin", "ping", "po", "pu", "qi", "qia", "qian", "qiang", "qiao", "qie", "qin", "qing", "qiong", "qiu", "qu", "quan", "que", "qun", "ran", "rang", "rao", "re", "ren", "reng", "ri", "rong", "rou", "ru", "ruan", "rui", "run", "ruo", "sa", "sai", "san", "sang", "sao", "se", "sen", "seng", "sha", "shai", "shan", "shang", "shao", "she", "shen", "sheng", "shi", "shou", "shu", "shua", "shuai", "shuan", "shuang", "shui", "shun", "shuo", "si", "song", "sou", "su", "suan", "sui", "sun", "suo", "ta", "tai", "tan", "tang", "tao", "te", "teng", "ti", "tian", "tiao", "tie", "ting", "tong", "tou", "tu", "tuan", "tui", "tun",
"tuo", "wa", "wai", "wan", "wang", "wei", "wen", "weng", "wo", "wu", "xi", "xia", "xian", "xiang", "xiao", "xie", "xin", "xing", "xiong", "xiu", "xu", "xuan", "xue", "xun", "ya", "yan", "yang", "yao", "ye", "yi", "yin", "ying", "yo", "yong", "you", "yu", "yuan", "yue", "yun", "za", "zai", "zan", "zang", "zao", "ze", "zei", "zen", "zeng", "zha", "zhai", "zhan", "zhang", "zhao", "zhe", "zhen", "zheng", "zhi", "zhong", "zhou", "zhu", "zhua", "zhuai", "zhuan", "zhuang", "zhui", "zhun", "zhuo", "zi", "zong", "zou", "zu", "zuan", "zui", "zun", "zuo" };
private StringBuilder buffer;
private String resource;
private static ChineseSpelling chineseSpelling = new ChineseSpelling();
public static ChineseSpelling getInstance() {
return chineseSpelling;
}
public String getResource() {
return resource;
}
public void setResource(String resource) {
this.resource = resource;
}
private int getChsAscii(String chs) {
int asc = 0;
try {
byte[] bytes = chs.getBytes("gb2312");
if (bytes == null || bytes.length > 2 || bytes.length <= 0) { // 错误
// log
throw new RuntimeException("illegal resource string");
// System.out.println("error");
}
if (bytes.length == 1) { // 英文字符
asc = bytes[0];
}
if (bytes.length == 2) { // 中文字符
int hightByte = 256 + bytes[0];
int lowByte = 256 + bytes[1];
asc = (256 * hightByte + lowByte) - 256 * 256;
}
} catch (Exception e) {
System.out.println("ERROR:ChineseSpelling.class-getChsAscii(String chs)" + e);
// e.printStackTrace();
}
return asc;
}
public String convert(String str) {
String result = null;
int ascii = getChsAscii(str);
// System.out.println(ascii);
if (ascii > 0 && ascii < 160) {
result = String.valueOf((char) ascii);
} else {
for (int i = (pyvalue.length - 1); i >= 0; i--) {
if (pyvalue[i] <= ascii) {
result = pystr[i];
break;
}
}
}
return result;
}
public String getSelling(String chs) {
String key, value;
buffer = new StringBuilder();
for (int i = 0; i < chs.length(); i++) {
key = chs.substring(i, i + 1);
if (key.getBytes().length == 2) {
value = (String) convert(key);
if (value == null) {
value = "unknown";
}
} else {
value = key;
}
buffer.append(value);
}
return buffer.toString();
}
public String getSpelling() {
return this.getSelling(this.getResource());
}
public static void main(String[] args) {
// ChineseSpelling finder = new ChineseSpelling();
ChineseSpelling finder = ChineseSpelling.getInstance();
finder.setResource("中文字符");
System.out.println(finder.getSpelling());
System.out.println(finder.getSelling("英文字符Eng"));
}
}
常用的java函数（五）人民币转成大写
/**
* 人民币转成大写
*
* @param value
* @return String
*/
public static String hangeToBig(double value)
{
char[] hunit = { '拾', '佰', '仟' }; // 段内位置表示
char[] vunit = { '万', '亿' }; // 段名表示
char[] digit = { '零', '壹', '贰', '叁', '肆', '伍', '陆', '柒', '捌', '玖' }; // 数字表示
long midVal = (long) (value * 100); // 转化成整形
String valStr = String.valueOf(midVal); // 转化成字符串
String head = valStr.substring(0, valStr.length() - 2); // 取整数部分
String rail = valStr.substring(valStr.length() - 2); // 取小数部分
String prefix = ""; // 整数部分转化的结果
String suffix = ""; // 小数部分转化的结果
// 处理小数点后面的数
if (rail.equals("00"))
{ // 如果小数部分为0
suffix = "整";
}
else
{
suffix = digit[rail.charAt(0) - '0'] + "角" + digit[rail.charAt(1) - '0'] + "分"; // 否则把角分转化出来
}
// 处理小数点前面的数
char[] chDig = head.toCharArray(); // 把整数部分转化成字符数组
char zero = '0'; // 标志'0'表示出现过0
byte zeroSerNum = 0; // 连续出现0的次数
for (int i = 0; i < chDig.length; i++)
{ // 循环处理每个数字
int idx = (chDig.length - i - 1) % 4; // 取段内位置
int vidx = (chDig.length - i - 1) / 4; // 取段位置
if (chDig[i] == '0')
{ // 如果当前字符是0
zeroSerNum++; // 连续0次数递增
if (zero == '0')
{ // 标志
zero = digit[0];
}
else if (idx == 0 && vidx > 0 && zeroSerNum < 4)
{
prefix += vunit[vidx - 1];
zero = '0';
}
continue;
}
zeroSerNum = 0; // 连续0次数清零
if (zero != '0')
{ // 如果标志不为0,则加上,例如万,亿什么的
prefix += zero;
zero = '0';
}
prefix += digit[chDig[i] - '0']; // 转化该数字表示
if (idx > 0)
prefix += hunit[idx - 1];
if (idx == 0 && vidx > 0)
{
prefix += vunit[vidx - 1]; // 段结束位置应该加上段名如万,亿
}
}
if (prefix.length() > 0)
prefix += '圆'; // 如果整数部分存在,则有圆的字样
return prefix + suffix; // 返回正确表示
常用的java函数（六）异常处理类
/**
* (#)ThrowableManager.java 1.0 Apr 10, 2008
*
* Copyright 2007- wargrey , Inc. All rights are reserved.
*/
package net.wargrey.application;
import java.awt.Component;
import javax.swing.JOptionPane;
/**
* This class <code>ExceptionManager</code> and its subclasses are a form of
* <code>Exception</code>. It is used to wrap all the <code>Throwable</code> instances
* and handle them in a unified way. It will show the information which consists of
* StackTraces and Messages by using JOptionPanel.
*
* @author Estelle
* @version 1.0
* @see java.lang.Exception
* @since jdk 1.5
*/
public class ExceptionManager extends Exception {
/**
* This field <code>alerter</code> is used to show the information the Class offered.
*
* @see javax.swing.JOptionPane
*/
private JOptionPane alerter;
/**
* This static method create an instance of the ExceptionManager by invoking the
* constructor <code>ExceptionManager(String msg)</code>.
*
* @param msg The message will pass the specified constructor
* @return An instance of the ExceptionManager created by invoking the constructor
* <code>ExceptionManager(String msg)</code>.
*/
public static ExceptionManager wrap(String msg){
return new ExceptionManager(msg);
}
/**
* This static method create an instance of the ExceptionManager by invoking the
* constructor <code>ExceptionManager(Throwable throwable)</code>.
*
* @param throwable The cause will pass the specified constructor
* @return An instance of the ExceptionManager created by invoking the constructor
* <code>ExceptionManager(Throwable throwable)</code>.
*/
public static ExceptionManager wrap(Throwable throwable){
return new ExceptionManager(throwable);
}
/**
* This static method create an instance of the ExceptionManager by invoking the
* constructor <code>ExceptionManager(String msg,Throwable throwable)</code>.
*
* @param msg The message will pass the specified constructor
* @param throwable The cause will pass the specified constructor
* @return An instance of the ExceptionManager created by invoking the constructor
* <code>ExceptionManager(String msg, Throwable throwable)</code>
*/
public static ExceptionManager wrap(String msg,Throwable throwable){
return new ExceptionManager(msg,throwable);
}
/**
* Constructs a new instance with the specified detail message. The concrete handler
* is its super class. This constructor always used to construct a custom exception
* not wrapping the exist exception.
*
* @param msg the detail message which is the part of the information will be
* shown.
*/
public ExceptionManager(String msg){
super(msg);
}
/**
* Constructs a new instance with the specified detail cause. The concrete handler
* is its super class. This constructor always used to wrap an exist exception.
*
* @param throwable the cause which has been caught. It's detail message and
* stacktrace are the parts the information will be shown.
*/
public ExceptionManager(Throwable throwable){
super(throwable);
}
/**
* Constructs a new instance with the specified detail message and cause. The
* concrete handler is its super class. This constructor always used to construct
* an exception wrapping the exist exception but requires a custom message.
*
* @param msg the detail message which is the part of the information will
* be shown.
* @param throwable the cause which has been caught. It's stacktrace is the parts
* the information will be shown.
*/
public ExceptionManager(String msg,Throwable throwable){
super(msg,throwable);
}
/**
* Show the information with everything is default.
*/
public synchronized void alert(){
alert((Component)null);
}
/**
* Show the information in a dialog with the specified title
* "ThrowableManager Alerter". The dialog belongs to the given component which
* default is the screen.
*
* @param parent The component cause the exception.
*/
public synchronized void alert(Component parent){
alert(parent,"ThrowableManager Alerter");
}
/**
* Show the information in a dialog with the specified title.
*
* @param title The title of the dialog.
*/
public synchronized void alert(String title){
alert((Component)null,title);
}
/**
* Show the information in a dialog which has the specified title and belongs to the
* specified component.
*
* @param parent The component cause the exception.
* @param title The title of the dialog.
*/
public synchronized void alert(Component parent,String title){
StringBuilder errorMessage=new StringBuilder();
errorMessage.append(this.toString());
for (StackTraceElement st:((this.getCause()==null)?this:this.getCause()).getStackTrace()){
errorMessage.append("\n\t at ");
errorMessage.append(st.toString());
}
alerter.showMessageDialog(parent, errorMessage, title ,JOptionPane.ERROR_MESSAGE);
}
}
常用的java函数（七）各类数据库连接
MySQL：
String Driver="com.mysql.jdbc.Driver"; //驱动程序
String URL="jdbc:mysql://localhost:3306/db_name"; //连接的URL,db_name为数据库名
String Username="username"; //用户名
String Password="password"; //密码
Class.forName(Driver).new Instance();
Connection con=DriverManager.getConnection(URL,Username,Password);
Microsoft SQL Server 2.0驱动(3个jar的那个):
String Driver="com.microsoft.jdbc.sqlserver.SQLServerDriver"; //连接SQL数据库的方法
String URL="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=db_name"; //db_name为数据库名
String Username="username"; //用户名
String Password="password"; //密码
Class.forName(Driver).new Instance(); //加载数据可驱动
Connection con=DriverManager.getConnection(URL,UserName,Password); //
Microsoft SQL Server 3.0驱动(1个jar的那个): // 老紫竹完善
String Driver="com.microsoft.sqlserver.jdbc.SQLServerDriver"; //连接SQL数据库的方法
String URL="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=db_name"; //db_name为数据库名
String Username="username"; //用户名
String Password="password"; //密码
Class.forName(Driver).new Instance(); //加载数据可驱动
Connection con=DriverManager.getConnection(URL,UserName,Password); //
Sysbase:
String Driver="com.sybase.jdbc.SybDriver"; //驱动程序
String URL="jdbc:Sysbase://localhost:5007/db_name"; //db_name为数据可名
String Username="username"; //用户名
String Password="password"; //密码
Class.forName(Driver).newInstance();
Connection con=DriverManager.getConnection(URL,Username,Password);
Oracle(用thin模式):
String Driver="oracle.jdbc.driver.OracleDriver"; //连接数据库的方法
String URL="jdbc:oracle:thin:@loaclhost:1521:orcl"; //orcl为数据库的SID
String Username="username"; //用户名
String Password="password"; //密码
Class.forName(Driver).newInstance(); //加载数据库驱动
Connection con=DriverManager.getConnection(URL,Username,Password);
PostgreSQL:
String Driver="org.postgresql.Driver"; //连接数据库的方法
String URL="jdbc:postgresql://localhost/db_name"; //db_name为数据可名
String Username="username"; //用户名
String Password="password"; //密码
Class.forName(Driver).newInstance();
Connection con=DriverManager.getConnection(URL,Username,Password);
DB2：
String Driver="com.ibm.db2.jdbc.app.DB2.Driver"; //连接具有DB2客户端的Provider实例
//String Driver="com.ibm.db2.jdbc.net.DB2.Driver"; //连接不具有DB2客户端的Provider实例
String URL="jdbc:db2://localhost:5000/db_name"; //db_name为数据可名
String Username="username"; //用户名
String Password="password"; //密码
Class.forName(Driver).newInstance();
Connection con=DriverManager.getConnection(URL,Username,Password);
Informix:
String Driver="com.informix.jdbc.IfxDriver";
String URL="jdbc:Informix-sqli://localhost:1533/db_name:INFORMIXSER=myserver"; //db_name为数据可名
String Username="username"; //用户名
String Password="password"; //密码
Class.forName(Driver).newInstance();
Connection con=DriverManager.getConnection(URL,Username,Password);
JDBC-ODBC:
String Driver="sun.jdbc.odbc.JdbcOdbcDriver";
String URL="jdbc:odbc:dbsource"; //dbsource为数据源名
String Username="username"; //用户名
String Password="password"; //密码
Class.forName(Driver).newInstance();
Connection con=DriverManager.getConnection(URL,Username,Password);
常用的java函数（八）TXT转XML
/*
*txt转换xml
*/
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.util.StringTokenizer;
public class TxtToXml {
private String strTxtFileName;
private String strXmlFileName;
public TxtToXml() {
strTxtFileName = new String();
strXmlFileName = new String();
}
public void createXml(String strTxt, String strXml) {
strTxtFileName = strTxt;
strXmlFileName = strXml;
String strTmp;
try {
BufferedReader inTxt = new BufferedReader(new FileReader(
strTxtFileName));
BufferedWriter outXml = new BufferedWriter(new FileWriter(
strXmlFileName));
outXml.write("<?xml version= \"1.0\" encoding=\"gb2312\"?>");
outXml.newLine();
outXml.write("<people>");
while ((strTmp = inTxt.readLine()) != null) {
StringTokenizer strToken = new StringTokenizer(strTmp, "，");
String arrTmp[];
arrTmp = new String[3];
for (int i = 0; i < 3; i++)
arrTmp[i] = new String("");
int index = 0;
outXml.newLine();
outXml.write(" <students>");
while (strToken.hasMoreElements()) {
strTmp = (String) strToken.nextElement();
strTmp = strTmp.trim();
arrTmp[index++] = strTmp;
}
outXml.newLine();
outXml.write(" <name>" + arrTmp[0] + "</name>");
outXml.newLine();
outXml.write(" <sex>" + arrTmp[1] + "</sex>");
outXml.newLine();
outXml.write(" <age>" + arrTmp[2] + "</age>");
outXml.newLine();
outXml.write(" </students>");
}
outXml.newLine();
outXml.write("</people>");
outXml.flush();
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
String txtName = "testtxt.txt";
String xmlName = "testxml.xml";
TxtToXml thisClass = new TxtToXml();
thisClass.createXml(txtName, xmlName);
}
}
常用的java函数（九）时间计算函数
import java.text.DecimalFormat;
import java.util.Arrays;
/**
* 时间计算工具类
*/
public class Time {
/**
* 时间字段常量，表示“秒”
*/
public final static int SECOND = 0;
/**
* 时间字段常量，表示“分”
*/
public final static int MINUTE = 1;
/**
* 时间字段常量，表示“时”
*/
public final static int HOUR = 2;
/**
* 时间字段常量，表示“天”
*/
public final static int DAY = 3;
/**
* 各常量允许的最大值
*/
private final int[] maxFields = { 59, 59, 23, Integer.MAX_VALUE - 1 };
/**
* 各常量允许的最小值
*/
private final int[] minFields = { 0, 0, 0, Integer.MIN_VALUE };
/**
* 默认的字符串格式时间分隔符
*/
private String timeSeparator = ":";
/**
* 时间数据容器
*/
private int[] fields = new int[4];
/**
* 无参构造，将各字段置为 0
*/
public Time() {
this(0, 0, 0, 0);
}
/**
* 使用时、分构造一个时间
* @param hour 小时
* @param minute 分钟
*/
public Time(int hour, int minute) {
this(0, hour, minute, 0);
}
/**
* 使用时、分、秒构造一个时间
* @param hour 小时
* @param minute 分钟
* @param second 秒
*/
public Time(int hour, int minute, int second) {
this(0, hour, minute, second);
}
/**
* 使用一个字符串构造时间<br/>
* Time time = new Time("14:22:23");
* @param time 字符串格式的时间，默认采用“:”作为分隔符
*/
public Time(String time) {
this(time, null);
}
/**
* 使用天、时、分、秒构造时间，进行全字符的构造
* @param day 天
* @param hour 时
* @param minute 分
* @param second 秒
*/
public Time(int day, int hour, int minute, int second) {
set(DAY, day);
set(HOUR, hour);
set(MINUTE, minute);
set(SECOND, second);
}
/**
* 使用一个字符串构造时间，指定分隔符<br/>
* Time time = new Time("14-22-23", "-");
* @param time 字符串格式的时间
*/
public Time(String time, String timeSeparator) {
if(timeSeparator != null) {
setTimeSeparator(timeSeparator);
}
String pattern = patternQuote(this.timeSeparator);
String matcher = new StringBuffer()
.append("\\d+?").append(pattern)
.append("\\d+?").append(pattern)
.append("\\d+?")
.toString();
if(!time.matches(matcher)) {
throw new IllegalArgumentException(time + ", time format error, HH"
+ this.timeSeparator + "mm" + this.timeSeparator + "ss");
}
String[] times = time.split(pattern);
set(DAY, 0);
set(HOUR, Integer.parseInt(times[0]));
set(MINUTE, Integer.parseInt(times[1]));
set(SECOND, Integer.parseInt(times[2]));
}
/**
* 设置时间字段的值
* @param field 时间字段常量
* @param value 时间字段的值
*/
public void set(int field, int value) {
if(value < minFields[field]) {
throw new IllegalArgumentException(value +
", time value must be positive.");
}
fields[field] = value % (maxFields[field] + 1);
// 进行进位计算
int carry = value / (maxFields[field] + 1);
if(carry > 0) {
int upFieldValue = get(field + 1);
set(field + 1, upFieldValue + carry);
}
}
/**
* 获得时间字段的值
* @param field 时间字段常量
* @return 该时间字段的值
*/
public int get(int field) {
if(field < 0 || field > fields.length - 1) {
throw new IllegalArgumentException(field + ", field value is error.");
}
return fields[field];
}
/**
* 将时间进行“加”运算，即加上一个时间
* @param time 需要加的时间
* @return 运算后的时间
*/
public Time addTime(Time time) {
Time result = new Time();
int up = 0; // 进位标志
for (int i = 0; i < fields.length; i++) {
int sum = fields[i] + time.fields[i] + up;
up = sum / (maxFields[i] + 1);
result.fields[i] = sum % (maxFields[i] + 1);
}
return result;
}
/**
* 将时间进行“减”运算，即减去一个时间
* @param time 需要减的时间
* @return 运算后的时间
*/
public Time subtractTime(Time time) {
Time result = new Time();
int down = 0; // 退位标志
for (int i = 0, k = fields.length - 1; i < k; i++) {
int difference = fields[i] + down;
if (difference >= time.fields[i]) {
difference -= time.fields[i];
down = 0;
} else {
difference += maxFields[i] + 1 - time.fields[i];
down = -1;
}
result.fields[i] = difference;
}
result.fields[DAY] = fields[DAY] - time.fields[DAY] + down;
return result;
}
/**
* 获得时间字段的分隔符
* @return
*/
public String getTimeSeparator() {
return timeSeparator;
}
/**
* 设置时间字段的分隔符（用于字符串格式的时间）
* @param timeSeparator 分隔符字符串
*/
public void setTimeSeparator(String timeSeparator) {
this.timeSeparator = timeSeparator;
}
/**
* 正则表达式引用处理方法，源自 JDK @link java.util.regex.Pattern#quote(String)
*/
private String patternQuote(String s) {
int slashEIndex = s.indexOf("\\E");
if (slashEIndex == -1)
return "\\Q" + s + "\\E";
StringBuilder sb = new StringBuilder(s.length() * 2);
sb.append("\\Q");
slashEIndex = 0;
int current = 0;
while ((slashEIndex = s.indexOf("\\E", current)) != -1) {
sb.append(s.substring(current, slashEIndex));
current = slashEIndex + 2;
sb.append("\\E\\\\E\\Q");
}
sb.append(s.substring(current, s.length()));
sb.append("\\E");
return sb.toString();
}
public String toString() {
DecimalFormat df = new DecimalFormat("00");
return new StringBuffer().append(fields[DAY]).append(", ")
.append(df.format(fields[HOUR])).append(timeSeparator)
.append(df.format(fields[MINUTE])).append(timeSeparator)
.append(df.format(fields[SECOND]))
.toString();
}
public int hashCode() {
final int PRIME = 31;
int result = 1;
result = PRIME * result + Arrays.hashCode(fields);
return result;
}
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
final Time other = (Time) obj;
if (!Arrays.equals(fields, other.fields)) {
return false;
}
return true;
}
}
常用的java函数（十）随机函数
/**
* @author talent_marquis<��˺��>
* Email: talent_marquis@163.com
* Copyright (C) 2007 talent_marquis<��˺��>
* All rights reserved.
*/
package com.dextrys.trilogy.util;
import java.util.Arrays;
import org.eclipse.swt.graphics.RGB;
public class RandomUtil
{
/**
* @param args
*/
public static void main( String[] args )
{
//System.out.println( getRandomNormalString( 8 ) );
int[] test = getRandomIntWithoutReduplicate( 0, 40, 39 );
Arrays.sort( test );
for( int i : test )
{
System.out.println( i );
}
}
/**
* get a integer array filled with random integer without reduplicate [min, max)
* @param min the minimum value
* @param max the maximum value
* @param size the capacity of the array
* @return a integer array filled with random integer without redupulicate
*/
public static int[] getRandomIntWithoutReduplicate( int min, int max, int size )
{
int[] result = new int[size];
int arraySize = max - min;
int[] intArray = new int[arraySize];
// init intArray
for( int i = 0 ; i < intArray.length ; i++ )
{
intArray[i] = i + min;
}
// get randome interger without reduplicate
for( int i = 0 ; i < size ; i++ )
{
int c = getRandomInt( min, max - i );
int index = c - min;
swap( intArray, index, arraySize - 1 - i );
result[i] = intArray[ arraySize - 1 - i ];
}
return result;
}
private static void swap( int[] array, int x, int y )
{
int temp = array[x];
array[x] = array[y];
array[y] = temp;
}
/**
* get a random Integer with the range [min, max)
* @param min the minimum value
* @param max the maximum value
* @return the random Integer value
*/
public static int getRandomInt( int min, int max )
{
// include min, exclude max
int result = min + new Double( Math.random() * ( max - min ) ).intValue();
return result;
}
/**
* get a random double with the range [min, max)
* @param min the minimum value
* @param max the maximum value
* @return the random double value
*/
public static double getRandomDouble( double min, double max )
{
// include min, exclude max
double result = min + ( Math.random() * ( max - min ) );
return result;
}
/**
*
* @return a random char with the range ASCII 33(!) to ASCII 126(~)
*/
public static char getRandomChar()
{
// from ASCII code 33 to ASCII code 126
int firstChar = 33; // "!"
int lastChar = 126; // "~"
char result = ( char ) ( getRandomInt( firstChar, lastChar + 1 ) );
return result;
}
/**
*
* @return a random rgb color
*/
public static RGB getRandomRGB()
{
int red = getRandomInt(0,256);
int green = getRandomInt(0,256);
int blue = getRandomInt(0,256);
return new RGB( red, green, blue );
}
/**
*
* @return a random char with the range [0-9],[a-z],[A-Z]
*/
public static char getRandomNormalChar()
{
// include 0-9,a-z,A-Z
int number = getRandomInt( 0, 62 );
int zeroChar = 48;
int nineChar = 57;
int aChar = 97;
int zChar = 122;
int AChar = 65;
int ZChar = 90;
char result;
if( number < 10 )
{
result = ( char ) ( getRandomInt( zeroChar, nineChar + 1 ) );
return result;
}
else if( number >= 10 && number < 36 )
{
result = ( char ) ( getRandomInt( AChar, ZChar + 1 ) );
return result;
}
else if( number >= 36 && number < 62 )
{
result = ( char ) ( getRandomInt( aChar, zChar + 1 ) );
return result;
}
else
{
return 0;
}
}
/**
*
* @param length the length of the String
* @return a String filled with random char
*/
public static String getRandomString( int length )
{
// include ASCII code from 33 to 126
StringBuffer result = new StringBuffer();
for( int i = 0; i < length; i++ )
{
result.append( getRandomChar() );
}
return result.toString();
}
/**
*
* @param length the length of the String
* @return a String filled with normal random char
*/
public static String getRandomNormalString( int length )
{
// include 0-9,a-z,A-Z
StringBuffer result = new StringBuffer();
for( int i = 0; i < length; i++)
{
result.append( getRandomNormalChar() );
}
return result.toString();
}
}
常用的java函数（十一）文件拷贝代码
import java.io.*;
import java.util.ArrayList;
import java.util.List;
public class FileCopy {
private String message = "";
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
/**
* 将源文件拷贝到目标文件
*
* @param src
* 写源文件地址，需文件名
* @param des
* 写目标文件地址，无需文件名
*/
public boolean copyFile(String src, String des) {
File srcFile = new File(src);
File desDir = new File(des);
File desFile = new File(des + "/" + srcFile.getName());
// 判断源文件是否存在
if (!srcFile.exists()) {
this.setMessage("源文件不存在！");
return false;
} else if (!srcFile.isFile()) {
this.setMessage("源文件格式错！");
return false;
}
// 判断源文件是否存在
if (!desDir.exists()) {
this.setMessage("目标目录不存在！");
return false;
} else if (!desDir.isDirectory()) {
this.setMessage("不是有效的目录！");
return false;
}
BufferedReader reader = null;
BufferedWriter writer = null;
String str;
try {
reader = new BufferedReader(new FileReader(srcFile));
writer = new BufferedWriter(new FileWriter(desFile));
// 判断目标文件是否存在及其格式，不存在就创建，格式不对先删除，存在就替代
if (!desFile.exists() || !desFile.isFile()) {
if (desFile.exists()) {
desFile.delete();
}
desFile.createNewFile();
}
// 从源文件读取数据，并写入目标文件
str = reader.readLine();
while (str != null) {
writer.write(str);
writer.newLine();
str = reader.readLine();
}
} catch (IOException e) {
this.setMessage(e.getMessage());
return false;
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
this.setMessage(e.getMessage());
}
}
if (writer != null) {
try {
writer.close();
} catch (IOException e) {
this.setMessage(e.getMessage());
}
}
}
return true;
}
private List fileList = new ArrayList();
/**
* 列出所有文件
* @param srcFile
*/
private void file(File srcFile) {
if (srcFile.isDirectory()) {
String[] files = srcFile.list();
for (int i = 0; i < files.length; i++) {
File f = new File(srcFile + "/" + files[i]);
// 如果是文件加入列表，否则递归列出
if (f.isFile()) {
fileList.add(f);
} else
file(f);
}
}else this.setMessage(srcFile.getAbsolutePath()+"不是目录");
}
/**
* 建立目录
* @param des
* @throws IOException
*/private void mkdir(File des) {
if (!des.exists() || !des.isDirectory()) {
mkdir(des.getParentFile());
if (des.exists()) {
des.delete();
}
des.mkdir();
}
}
/**
* 复制目录 将源目录下所有文件拷贝到目标目录下
* @param src 源目录
* @param des 目标目录
*/
public boolean copyDir(String src, String des) {
File srcFile = new File(src);
if (!srcFile.exists()) {
this.setMessage("源目录不存在！");
return false;
} else if (!srcFile.isDirectory()) {
this.setMessage(src+"不是有效的目录！");
return false;
}
file(srcFile);
for (int i = 0; i < fileList.size(); i++) {
String srcName = ((File) fileList.get(i)).getPath();
String desName = srcName.substring(src.length(), srcName.length());
desName = des + desName;
File dir=new File(desName).getParentFile();
mkdir(dir);
if(!copyFile(srcName, dir.getPath())){
return false;
}
}
return true;
}
public static void main(String[] args) {
FileCopy t = new FileCopy();
System.out.println(t.copyFile("D:/aaa.txt","E:"));
String src="D:/asdf";
String des="E:/adf";
System.out.println(t.copyDir(src, des));
System.out.println(t.getMessage());
}
}
常用的java函数（十二）正则表达式用于字符串处理
正则表达式用于字符串处理、表单验证等场合，实用高效。现将一些常用的表达式收集于此，以备不时之需。
匹配中文字符的正则表达式： [\u4e00-\u9fa5]
评注：匹配中文还真是个头疼的事，有了这个表达式就好办了
匹配双字节字符(包括汉字在内)：[^\x00-\xff]
评注：可以用来计算字符串的长度（一个双字节字符长度计2，ASCII字符计1）
匹配空白行的正则表达式：\n\s*\r
评注：可以用来删除空白行
匹配HTML标记的正则表达式： <(\S*?)[^>]*>.*? </\1> ¦ <.*? />
评注：网上流传的版本太糟糕，上面这个也仅仅能匹配部分，对于复杂的嵌套标记依旧无能为力
匹配首尾空白字符的正则表达式：^\s* ¦\s*$
评注：可以用来删除行首行尾的空白字符(包括空格、制表符、换页符等等)，非常有用的表达式
匹配Email地址的正则表达式：\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*
评注：表单验证时很实用
匹配网址URL的正则表达式：[a-zA-z]+://[^\s]*
评注：网上流传的版本功能很有限，上面这个基本可以满足需求
匹配帐号是否合法(字母开头，允许5-16字节，允许字母数字下划线)：^[a-zA-Z][a-zA-Z0-9_]{4,15}$
评注：表单验证时很实用
匹配国内电话号码：\d{3}-\d{8} ¦\d{4}-\d{7}
评注：匹配形式如 0511-4405222 或 021-87888822
匹配腾讯QQ号：[1-9][0-9]{4,}
评注：腾讯QQ号从10000开始
匹配中国邮政编码：[1-9]\d{5}(?!\d)
评注：中国邮政编码为6位数字
匹配身份证：\d{15} ¦\d{18}
评注：中国的身份证为15位或18位
匹配ip地址：\d+\.\d+\.\d+\.\d+
评注：提取ip地址时有用
匹配特定数字：
^[1-9]\d*$ //匹配正整数
^-[1-9]\d*$ //匹配负整数
^-?[1-9]\d*$ //匹配整数
^[1-9]\d* ¦0$ //匹配非负整数（正整数 + 0）
^-[1-9]\d* ¦0$ //匹配非正整数（负整数 + 0）
^[1-9]\d*\.\d* ¦0\.\d*[1-9]\d*$ //匹配正浮点数
^-([1-9]\d*\.\d* ¦0\.\d*[1-9]\d*)$ //匹配负浮点数
^-?([1-9]\d*\.\d* ¦0\.\d*[1-9]\d* ¦0?\.0+ ¦0)$ //匹配浮点数
^[1-9]\d*\.\d* ¦0\.\d*[1-9]\d* ¦0?\.0+ ¦0$ //匹配非负浮点数（正浮点数 + 0）
^(-([1-9]\d*\.\d* ¦0\.\d*[1-9]\d*)) ¦0?\.0+ ¦0$ //匹配非正浮点数（负浮点数 + 0）
评注：处理大量数据时有用，具体应用时注意修正
匹配特定字符串：
^[A-Za-z]+$ //匹配由26个英文字母组成的字符串
^[A-Z]+$ //匹配由26个英文字母的大写组成的字符串
^[a-z]+$ //匹配由26个英文字母的小写组成的字符串
^[A-Za-z0-9]+$ //匹配由数字和26个英文字母组成的字符串
^\w+$ //匹配由数字、26个英文字母或者下划线组成的字符串
评注：最基本也是最常用的一些表达式
常用的java函数（十三）日期公用处理类
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.LinkedHashMap;
/**
* 日期公用处理类
*
* @author SongJun
* @version 1.3
*/
public class DateUtil {
/**
* 解析一个日期之间的所有月份
*
* @param beginDateStr
* @param endDateStr
* @return
*/
public static ArrayList getMonthList(String beginDateStr, String endDateStr) {
// 指定要解析的时间格式
SimpleDateFormat f = new SimpleDateFormat("yyyy-MM");
// 返回的月份列表
String sRet = "";
// 定义一些变量
Date beginDate = null;
Date endDate = null;
GregorianCalendar beginGC = null;
GregorianCalendar endGC = null;
ArrayList list = new ArrayList();
try {
// 将字符串parse成日期
beginDate = f.parse(beginDateStr);
endDate = f.parse(endDateStr);
// 设置日历
beginGC = new GregorianCalendar();
beginGC.setTime(beginDate);
endGC = new GregorianCalendar();
endGC.setTime(endDate);
// 直到两个时间相同
while (beginGC.getTime().compareTo(endGC.getTime()) <= 0) {
sRet = beginGC.get(Calendar.YEAR) + "-"
+ (beginGC.get(Calendar.MONTH) + 1);
list.add(sRet);
// 以月为单位，增加时间
beginGC.add(Calendar.MONTH, 1);
}
return list;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
/**
* 解析一个日期段之间的所有日期
*
* @param beginDateStr
* 开始日期
* @param endDateStr
* 结束日期
* @return
*/
public static ArrayList getDayList(String beginDateStr, String endDateStr) {
// 指定要解析的时间格式
SimpleDateFormat f = new SimpleDateFormat("yyyy-MM-dd");
// 定义一些变量
Date beginDate = null;
Date endDate = null;
Calendar beginGC = null;
Calendar endGC = null;
ArrayList list = new ArrayList();
try {
// 将字符串parse成日期
beginDate = f.parse(beginDateStr);
endDate = f.parse(endDateStr);
// 设置日历
beginGC = Calendar.getInstance();
beginGC.setTime(beginDate);
endGC = Calendar.getInstance();
endGC.setTime(endDate);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
// 直到两个时间相同
while (beginGC.getTime().compareTo(endGC.getTime()) <= 0) {
list.add(sdf.format(beginGC.getTime()));
// 以日为单位，增加时间
beginGC.add(Calendar.DAY_OF_MONTH, 1);
}
return list;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
public static ArrayList getYearList() {
ArrayList list = new ArrayList();
Calendar c = null;
c = Calendar.getInstance();
c.setTime(new Date());
int currYear = Calendar.getInstance().get(Calendar.YEAR);
int startYear = currYear - 5;
int endYear = currYear + 10;
for (int i = startYear; i < endYear; i++) {
list.add(new Integer(i));
}
return list;
}
public static int getCurrYear() {
return Calendar.getInstance().get(Calendar.YEAR);
}
/**
* 得到某一年周的总数
*
* @param year
* @return
*/
public static LinkedHashMap getWeekList(int year) {
LinkedHashMap map = new LinkedHashMap();
Calendar c = new GregorianCalendar();
c.set(year, Calendar.DECEMBER, 31, 23, 59, 59);
int count = getWeekOfYear(c.getTime());
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String dayOfWeekStart = "";
String dayOfWeekEnd = "";
for (int i = 1; i <= count; i++) {
dayOfWeekStart = sdf.format(getFirstDayOfWeek(year, i));
dayOfWeekEnd = sdf.format(getLastDayOfWeek(year, i));
map.put(new Integer(i), "第"+i+"周(从"+dayOfWeekStart + "至" + dayOfWeekEnd+")");
}
return map;
}
/**
* 得到一年的总周数
* @param year
* @return
*/
public static int getWeekCountInYear(int year){
Calendar c = new GregorianCalendar();
c.set(year, Calendar.DECEMBER, 31, 23, 59, 59);
int count = getWeekOfYear(c.getTime());
return count;
}
/**
* 取得当前日期是多少周
*
* @param date
* @return
*/
public static int getWeekOfYear(Date date) {
Calendar c = new GregorianCalendar();
c.setFirstDayOfWeek(Calendar.MONDAY);
c.setMinimalDaysInFirstWeek(7);
c.setTime(date);
return c.get(Calendar.WEEK_OF_YEAR);
}
/**
* 得到某年某周的第一天
*
* @param year
* @param week
* @return
*/
public static Date getFirstDayOfWeek(int year, int week) {
Calendar c = new GregorianCalendar();
c.set(Calendar.YEAR, year);
c.set(Calendar.MONTH, Calendar.JANUARY);
c.set(Calendar.DATE, 1);
Calendar cal = (GregorianCalendar) c.clone();
cal.add(Calendar.DATE, week * 7);
return getFirstDayOfWeek(cal.getTime());
}
/**
* 得到某年某周的最后一天
*
* @param year
* @param week
* @return
*/
public static Date getLastDayOfWeek(int year, int week) {
Calendar c = new GregorianCalendar();
c.set(Calendar.YEAR, year);
c.set(Calendar.MONTH, Calendar.JANUARY);
c.set(Calendar.DATE, 1);
Calendar cal = (GregorianCalendar) c.clone();
cal.add(Calendar.DATE, week * 7);
return getLastDayOfWeek(cal.getTime());
}
/**
* 得到某年某月的第一天
* @param year
* @param month
* @return
*/
public static Date getFirestDayOfMonth(int year,int month){
month = month-1;
Calendar c = Calendar.getInstance();
c.set(Calendar.YEAR, year);
c.set(Calendar.MONTH, month);
int day = c.getActualMinimum(c.DAY_OF_MONTH);
c.set(Calendar.DAY_OF_MONTH, day);
return c.getTime();
}
/**
* 提到某年某月的最后一天
* @param year
* @param month
* @return
*/
public static Date getLastDayOfMonth(int year,int month){
month = month-1;
Calendar c = Calendar.getInstance();
c.set(Calendar.YEAR, year);
c.set(Calendar.MONTH, month);
int day = c.getActualMaximum(c.DAY_OF_MONTH);
c.set(Calendar.DAY_OF_MONTH, day);
return c.getTime();
}
/**
* 取得当前日期所在周的第一天
*
* @param date
* @return
*/
public static Date getFirstDayOfWeek(Date date) {
Calendar c = new GregorianCalendar();
c.setFirstDayOfWeek(Calendar.MONDAY);
c.setTime(date);
c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek()); // Monday
return c.getTime();
}
/**
* 取得当前日期所在周的最后一天
*
* @param date
* @return
*/
public static Date getLastDayOfWeek(Date date) {
Calendar c = new GregorianCalendar();
c.setFirstDayOfWeek(Calendar.MONDAY);
c.setTime(date);
c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek() + 6); // Sunday
return c.getTime();
}
}