原创,非转
基于JAVA标注实现统一的前台(JS层)后台(JAVA层)想法[/b]
通过标注的方式进行前后台的统一验证的好处是很多的,增强前后台验证的一致性,减少代码的重复,不需要前台与一份验证,后台再写一份了。
本人想基于这种方式写一个基于Annotation的完整的Validator的开源的小框架,但发现要做的事情很多,工作量很大,要一点一点的来,一点一点的完善,最后闲时写了个大 概,与大家一起探讨,
- 通过JAVA标注将前台和后台的验证规则标到JAVA的值对象的类中。
- Validator在初始化的过程中,一次性读入JAVA的值对象的类中验证规则的标注信息,并生成前台需要的校验的JS文件。
- 前台页面可以直接引入自动生成的校验的JS文件,进行校验。a
- 后台得到从前台请求request绑定好值的JAVA的值对象,通过AnnotationValidator类进行验证。
以下是Annotation标注的代码。
进行不可以为空的校验标注
- @Retention (RetentionPolicy.RUNTIME)
- @Target(ElementType.FIELD)
-
- public @interface CanNotNull {
-
- }
进行是否是整数的校验标注
- @Retention(RetentionPolicy.RUNTIME)
- @Target(ElementType.FIELD)
- public @interface IsInteger {
- public int minWidth() default 1;
- public int maxWidth() default Integer.MAX_VALUE;
- public int minValue() default Integer.MIN_VALUE;
- public int maxValue() default Integer.MAX_VALUE;
-
- }
用于添写字段中文的标注
- @Retention(RetentionPolicy.RUNTIME)
- @Target(ElementType.FIELD)
- public @interface FieldDesc {
- public String value();
-
- }
验证器的代码:
- package com.javaest.validity.process;
-
- import java.io.BufferedWriter;
- import java.io.File;
- import java.io.FileWriter;
- import java.io.IOException;
- import java.lang.reflect.Field;
- import java.lang.reflect.InvocationTargetException;
- import java.lang.reflect.Method;
- import java.util.ArrayList;
- import java.util.HashMap;
- import java.util.List;
- import java.util.Map;
-
- import com.javaest.util.StringUtils;
- import com.javaest.validity.annotation.CanNotNull;
- import com.javaest.validity.annotation.FieldDesc;
- import com.javaest.validity.annotation.IsInteger;
- import com.javaest.validity.test.pojo.Student;
-
- public class PojoBeanAnnotationValiditer {
- private static Map<String, Map> allValidityRuleMap = new HashMap<String, Map>();
- private static Map<String, Map> allFieldDescMap = new HashMap<String, Map>();
- private static String jsValiditerFilePath;
- private static String[] pojoBeanPackageName;
-
-
-
-
- public static void loadAllClassAnnotationValidityInfoInPackage(String[] packageNameArr)
- throws IllegalArgumentException, SecurityException, IllegalAccessException, NoSuchMethodException,
- InvocationTargetException, ClassNotFoundException, IOException {
- for (int i = 0; i < packageNameArr.length; i++) {
- List<Class> classList = ReflectUtils.getAllClassInPackage(packageNameArr[i]);
- for (int j = 0; j < classList.size(); j++) {
- Class currClass = classList.get(j);
- String classFullName = currClass.getPackage().getName() + "." + currClass.getName();
- Map[] validityRuleMapAndFieldDescMap = loadValidityRuleAndCreateValidityJsFile(currClass);
- allValidityRuleMap.put(classFullName, validityRuleMapAndFieldDescMap[0]);
- allFieldDescMap.put(classFullName, validityRuleMapAndFieldDescMap[1]);
- }
- }
- }
-
-
-
-
- private static Map[] loadValidityRuleAndCreateValidityJsFile(Class currClass) throws IllegalArgumentException,
- IllegalAccessException, SecurityException, NoSuchMethodException, InvocationTargetException, IOException {
- StringBuffer validityCanNotNullJsStrBuf = new StringBuffer();
- StringBuffer validityIsIntegerJsStrBuf = new StringBuffer();
- Field[] fieldArr = currClass.getDeclaredFields();
- List<String> canNotNullFieldNameList = new ArrayList<String>();
- List<IsIntegerValiditerRuleInfo> isIntegerValiditerRuleInfoList = new ArrayList<IsIntegerValiditerRuleInfo>();
- Map<String, String> fieldDescMap = new HashMap<String, String>();
- for (int i = 0; i < fieldArr.length; i++) {
- String currFieldName = fieldArr[i].getName();
-
- FieldDesc fieldDescAnnotation = fieldArr[i].getAnnotation(FieldDesc.class);
- if (fieldDescAnnotation != null) {
- String fieldDesc = fieldDescAnnotation.value();
- System.out.println(fieldDesc);
- fieldDescMap.put(currFieldName, fieldDesc);
- }
- else {
- fieldDescMap.put(currFieldName, currFieldName);
- }
-
- if (fieldArr[i].isAnnotationPresent(CanNotNull.class)) {
- canNotNullFieldNameList.add(currFieldName);
- validityCanNotNullJsStrBuf.append("if(document.all." + currFieldName + ".value.trim()==\"\"){alert('"
- + fieldDescMap.get(currFieldName) + "不可以为空');}\n");
- }
-
- IsInteger isIntegerAnnotation = fieldArr[i].getAnnotation(IsInteger.class);
- if (isIntegerAnnotation != null) {
- int minWidth = isIntegerAnnotation.minWidth();
- int maxWidth = isIntegerAnnotation.maxWidth();
- int minValue = isIntegerAnnotation.minValue();
- int maxValue = isIntegerAnnotation.maxValue();
- IsIntegerValiditerRuleInfo isIntegerValiditerRuleInfo = new IsIntegerValiditerRuleInfo(currFieldName,
- minWidth, maxWidth, minValue, maxValue);
- isIntegerValiditerRuleInfoList.add(isIntegerValiditerRuleInfo);
- if (minWidth > 0) {
- validityIsIntegerJsStrBuf.append("if(document.all." + currFieldName
- + ".value.length()<minWidth){alert('" + fieldDescMap.get(currFieldName) + "宽度不够!');}\n");
- }
- if (maxWidth < Integer.MAX_VALUE) {
- validityIsIntegerJsStrBuf.append("if(document.all." + currFieldName
- + ".value.length()>maxWidth){alert('" + fieldDescMap.get(currFieldName) + "宽度太长!');}\n");
- }
- if (minValue > Integer.MIN_VALUE) {
- validityIsIntegerJsStrBuf.append("if(document.all." + currFieldName + ".value*1<minValue){alert('"
- + fieldDescMap.get(currFieldName) + "的数值太小!');}\n");
- }
- if (maxValue < Integer.MAX_VALUE) {
- validityIsIntegerJsStrBuf.append("if(document.all." + currFieldName + ".value*1>maxValue){alert('"
- + fieldDescMap.get(currFieldName) + "的数值太大!');}\n");
- }
- }
- }
- Map<String, List> classValidityRuleMap = new HashMap<String, List>();
- classValidityRuleMap.put("canNotNullFieldNameList", canNotNullFieldNameList);
- classValidityRuleMap.put("isIntegerValiditerRuleInfoList", isIntegerValiditerRuleInfoList);
-
- BufferedWriter jsFileWriter = new BufferedWriter(new FileWriter(new File(jsValiditerFilePath
- + java.io.File.separator + currClass.getName() + ".js")));
- jsFileWriter.write(validityCanNotNullJsStrBuf.toString());
- jsFileWriter.write(validityIsIntegerJsStrBuf.toString());
- jsFileWriter.close();
- return new Map[] { classValidityRuleMap, fieldDescMap };
-
- }
-
-
-
-
- public static ValidityResult validity(Object currObj) throws IllegalArgumentException, IllegalAccessException,
- SecurityException, NoSuchMethodException, InvocationTargetException {
- Class aClass = currObj.getClass();
- String classFullName = aClass.getPackage().getName() + "." + aClass.getName();
- Field[] fieldArr = aClass.getDeclaredFields();
-
- Map validityRuleMap = allValidityRuleMap.get(classFullName);
- Map fieldDescMap = allFieldDescMap.get(classFullName);
- List canNotNullFieldNameList = (List) validityRuleMap.get("canNotNullFieldNameList");
- List isIntegerValiditerRuleInfoList = (List) validityRuleMap.get("isIntegerValiditerRuleInfoList");
- ValidityResult validityResult = new ValidityResult();
- for (int j = 0; j < canNotNullFieldNameList.size(); j++) {
- String currFieldName = (String) canNotNullFieldNameList.get(j);
- String getMethodName = "get" + currFieldName.substring(0, 1).toUpperCase() + currFieldName.substring(1);
- Method getFieldValueMethod = aClass.getMethod(getMethodName);
- String fieldValue = ((String) getFieldValueMethod.invoke(currObj));
- if (fieldValue == null || fieldValue.equals("")) {
- System.out.println(fieldDescMap.get(currFieldName) + " 不可以为空 ! ");
- validityResult.addValidityInfo(fieldDescMap.get(currFieldName) + " 不可以为空 ! ");
- }
- }
-
- for (int j = 0; j < isIntegerValiditerRuleInfoList.size(); j++) {
- IsIntegerValiditerRuleInfo isIntegerValiditerRuleInfo = (IsIntegerValiditerRuleInfo) isIntegerValiditerRuleInfoList
- .get(j);
- String currFieldName = isIntegerValiditerRuleInfo.getFieldName();
- String getMethodName = "get" + currFieldName.substring(0, 1).toUpperCase() + currFieldName.substring(1);
- Method getFieldValueMethod = aClass.getMethod(getMethodName);
- String fieldValue = ((String) getFieldValueMethod.invoke(currObj));
- int minWidth = isIntegerValiditerRuleInfo.getMinWidth();
- int maxWidth = isIntegerValiditerRuleInfo.getMaxWidth();
- int minValue = isIntegerValiditerRuleInfo.getMinValue();
- int maxValue = isIntegerValiditerRuleInfo.getMaxValue();
-
- if (StringUtils.isInteger(fieldValue)) {
- if (fieldValue.length() < minWidth) {
- validityResult.addValidityInfo(fieldDescMap.get(currFieldName) + " 宽度不可以小于 " + minWidth + "! ");
- }
- if (fieldValue.length() > maxWidth) {
- validityResult.addValidityInfo(fieldDescMap.get(currFieldName) + " 宽度不可以大于 " + maxWidth + "! ");
- }
- if (Integer.parseInt(fieldValue) < minValue) {
- validityResult.addValidityInfo(fieldDescMap.get(currFieldName) + " 的值不可以小于 " + minValue + "! ");
- }
- if (Integer.parseInt(fieldValue) > maxValue) {
- validityResult.addValidityInfo(fieldDescMap.get(currFieldName) + " 的值不可以大于 " + maxValue + "! ");
- }
-
- }
- else {
-
- validityResult.addValidityInfo(fieldDescMap.get(currFieldName) + " 必须是整数格式 ! ");
-
- }
- }
- return validityResult;
-
- }
-
- public static String[] getPojoBeanPackageName() {
- return pojoBeanPackageName;
- }
-
- public static void setPojoBeanPackageName(String[] pojoBeanPackageName) {
- PojoBeanAnnotationValiditer.pojoBeanPackageName = pojoBeanPackageName;
- }
-
- public static String getJsValiditerFilePath() {
- return jsValiditerFilePath;
- }
-
- public static void setJsValiditerFilePath(String jsValiditerFilePath) {
- PojoBeanAnnotationValiditer.jsValiditerFilePath = jsValiditerFilePath;
- }
-
- public static void main(String[] args) throws IllegalArgumentException, IllegalAccessException, SecurityException,
- NoSuchMethodException, InvocationTargetException, ClassNotFoundException, IOException {
- PojoBeanAnnotationValiditer.setPojoBeanPackageName(new String[] { "com.javaest.validity.test.pojo" });
- PojoBeanAnnotationValiditer.setJsValiditerFilePath("JS\\VALIDITY");
- PojoBeanAnnotationValiditer
- .loadAllClassAnnotationValidityInfoInPackage(new String[] { "com.javaest.validity.test.pojo" });
- Student aStudent = new Student();
- aStudent.setAddress("吉林省长春市二道区");
- aStudent.setId("");
- aStudent.setAge("9");
- ValidityResult validityResult = PojoBeanAnnotationValiditer.validity(aStudent);
- }
-
- }</SPAN>
package com.javaest.validity.process;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.javaest.util.StringUtils;
import com.javaest.validity.annotation.CanNotNull;
import com.javaest.validity.annotation.FieldDesc;
import com.javaest.validity.annotation.IsInteger;
import com.javaest.validity.test.pojo.Student;
public class PojoBeanAnnotationValiditer {
private static Map<String, Map> allValidityRuleMap = new HashMap<String, Map>();
private static Map<String, Map> allFieldDescMap = new HashMap<String, Map>();
private static String jsValiditerFilePath;
private static String[] pojoBeanPackageName;
/**
*
将指定的包下边的所有Pojo类的标注信息一次性的读取到Map中,以备以后验证对象时使用
*/
public static void loadAllClassAnnotationValidityInfoInPackage(String[] packageNameArr)
throws IllegalArgumentException, SecurityException, IllegalAccessException, NoSuchMethodException,
InvocationTargetException, ClassNotFoundException, IOException {
for (int i = 0; i < packageNameArr.length; i++) {
List<Class> classList = ReflectUtils.getAllClassInPackage(packageNameArr[i]);
for (int j = 0; j < classList.size(); j++) {
Class currClass = classList.get(j);
String classFullName = currClass.getPackage().getName() + "." + currClass.getName();
Map[] validityRuleMapAndFieldDescMap = loadValidityRuleAndCreateValidityJsFile(currClass);
allValidityRuleMap.put(classFullName, validityRuleMapAndFieldDescMap[0]);
allFieldDescMap.put(classFullName, validityRuleMapAndFieldDescMap[1]);
}
}
}
/*
* 对具体的一个类的标注做处理,读入字段描述 信息,读入非空验证信息,读入整数验证信息,并根据这些信息生成JS代码。
*/
private static Map[] loadValidityRuleAndCreateValidityJsFile(Class currClass) throws IllegalArgumentException,
IllegalAccessException, SecurityException, NoSuchMethodException, InvocationTargetException, IOException {
StringBuffer validityCanNotNullJsStrBuf = new StringBuffer();
StringBuffer validityIsIntegerJsStrBuf = new StringBuffer();
Field[] fieldArr = currClass.getDeclaredFields();
List<String> canNotNullFieldNameList = new ArrayList<String>();
List<IsIntegerValiditerRuleInfo> isIntegerValiditerRuleInfoList = new ArrayList<IsIntegerValiditerRuleInfo>();
Map<String, String> fieldDescMap = new HashMap<String, String>();
for (int i = 0; i < fieldArr.length; i++) {
String currFieldName = fieldArr[i].getName();
//读入字段描述 信息
FieldDesc fieldDescAnnotation = fieldArr[i].getAnnotation(FieldDesc.class);
if (fieldDescAnnotation != null) {
String fieldDesc = fieldDescAnnotation.value();
System.out.println(fieldDesc);
fieldDescMap.put(currFieldName, fieldDesc);
}
else {
fieldDescMap.put(currFieldName, currFieldName);
}
//读入非空验证信息
if (fieldArr[i].isAnnotationPresent(CanNotNull.class)) {
canNotNullFieldNameList.add(currFieldName);
validityCanNotNullJsStrBuf.append("if(document.all." + currFieldName + ".value.trim()==\"\"){alert('"
+ fieldDescMap.get(currFieldName) + "不可以为空');}\n");
}
//读入整数验证信息
IsInteger isIntegerAnnotation = fieldArr[i].getAnnotation(IsInteger.class);
if (isIntegerAnnotation != null) {
int minWidth = isIntegerAnnotation.minWidth();
int maxWidth = isIntegerAnnotation.maxWidth();
int minValue = isIntegerAnnotation.minValue();
int maxValue = isIntegerAnnotation.maxValue();
IsIntegerValiditerRuleInfo isIntegerValiditerRuleInfo = new IsIntegerValiditerRuleInfo(currFieldName,
minWidth, maxWidth, minValue, maxValue);
isIntegerValiditerRuleInfoList.add(isIntegerValiditerRuleInfo);
if (minWidth > 0) {
validityIsIntegerJsStrBuf.append("if(document.all." + currFieldName
+ ".value.length()<minWidth){alert('" + fieldDescMap.get(currFieldName) + "宽度不够!');}\n");
}
if (maxWidth < Integer.MAX_VALUE) {
validityIsIntegerJsStrBuf.append("if(document.all." + currFieldName
+ ".value.length()>maxWidth){alert('" + fieldDescMap.get(currFieldName) + "宽度太长!');}\n");
}
if (minValue > Integer.MIN_VALUE) {
validityIsIntegerJsStrBuf.append("if(document.all." + currFieldName + ".value*1<minValue){alert('"
+ fieldDescMap.get(currFieldName) + "的数值太小!');}\n");
}
if (maxValue < Integer.MAX_VALUE) {
validityIsIntegerJsStrBuf.append("if(document.all." + currFieldName + ".value*1>maxValue){alert('"
+ fieldDescMap.get(currFieldName) + "的数值太大!');}\n");
}
}
}
Map<String, List> classValidityRuleMap = new HashMap<String, List>();
classValidityRuleMap.put("canNotNullFieldNameList", canNotNullFieldNameList);
classValidityRuleMap.put("isIntegerValiditerRuleInfoList", isIntegerValiditerRuleInfoList);
//根据这些信息生成JS代码
BufferedWriter jsFileWriter = new BufferedWriter(new FileWriter(new File(jsValiditerFilePath
+ java.io.File.separator + currClass.getName() + ".js")));
jsFileWriter.write(validityCanNotNullJsStrBuf.toString());
jsFileWriter.write(validityIsIntegerJsStrBuf.toString());
jsFileWriter.close();
return new Map[] { classValidityRuleMap, fieldDescMap };
}
/*
* 具体的后台验证过程
*/
public static ValidityResult validity(Object currObj) throws IllegalArgumentException, IllegalAccessException,
SecurityException, NoSuchMethodException, InvocationTargetException {
Class aClass = currObj.getClass();
String classFullName = aClass.getPackage().getName() + "." + aClass.getName();
Field[] fieldArr = aClass.getDeclaredFields();
Map validityRuleMap = allValidityRuleMap.get(classFullName);
Map fieldDescMap = allFieldDescMap.get(classFullName);
List canNotNullFieldNameList = (List) validityRuleMap.get("canNotNullFieldNameList");
List isIntegerValiditerRuleInfoList = (List) validityRuleMap.get("isIntegerValiditerRuleInfoList");
ValidityResult validityResult = new ValidityResult();
for (int j = 0; j < canNotNullFieldNameList.size(); j++) {
String currFieldName = (String) canNotNullFieldNameList.get(j);
String getMethodName = "get" + currFieldName.substring(0, 1).toUpperCase() + currFieldName.substring(1);
Method getFieldValueMethod = aClass.getMethod(getMethodName);
String fieldValue = ((String) getFieldValueMethod.invoke(currObj));
if (fieldValue == null || fieldValue.equals("")) {
System.out.println(fieldDescMap.get(currFieldName) + " 不可以为空 ! ");
validityResult.addValidityInfo(fieldDescMap.get(currFieldName) + " 不可以为空 ! ");
}
}
for (int j = 0; j < isIntegerValiditerRuleInfoList.size(); j++) {
IsIntegerValiditerRuleInfo isIntegerValiditerRuleInfo = (IsIntegerValiditerRuleInfo) isIntegerValiditerRuleInfoList
.get(j);
String currFieldName = isIntegerValiditerRuleInfo.getFieldName();
String getMethodName = "get" + currFieldName.substring(0, 1).toUpperCase() + currFieldName.substring(1);
Method getFieldValueMethod = aClass.getMethod(getMethodName);
String fieldValue = ((String) getFieldValueMethod.invoke(currObj));
int minWidth = isIntegerValiditerRuleInfo.getMinWidth();
int maxWidth = isIntegerValiditerRuleInfo.getMaxWidth();
int minValue = isIntegerValiditerRuleInfo.getMinValue();
int maxValue = isIntegerValiditerRuleInfo.getMaxValue();
if (StringUtils.isInteger(fieldValue)) {
if (fieldValue.length() < minWidth) {
validityResult.addValidityInfo(fieldDescMap.get(currFieldName) + " 宽度不可以小于 " + minWidth + "! ");
}
if (fieldValue.length() > maxWidth) {
validityResult.addValidityInfo(fieldDescMap.get(currFieldName) + " 宽度不可以大于 " + maxWidth + "! ");
}
if (Integer.parseInt(fieldValue) < minValue) {
validityResult.addValidityInfo(fieldDescMap.get(currFieldName) + " 的值不可以小于 " + minValue + "! ");
}
if (Integer.parseInt(fieldValue) > maxValue) {
validityResult.addValidityInfo(fieldDescMap.get(currFieldName) + " 的值不可以大于 " + maxValue + "! ");
}
}
else {
validityResult.addValidityInfo(fieldDescMap.get(currFieldName) + " 必须是整数格式 ! ");
}
}
return validityResult;
}
public static String[] getPojoBeanPackageName() {
return pojoBeanPackageName;
}
public static void setPojoBeanPackageName(String[] pojoBeanPackageName) {
PojoBeanAnnotationValiditer.pojoBeanPackageName = pojoBeanPackageName;
}
public static String getJsValiditerFilePath() {
return jsValiditerFilePath;
}
public static void setJsValiditerFilePath(String jsValiditerFilePath) {
PojoBeanAnnotationValiditer.jsValiditerFilePath = jsValiditerFilePath;
}
public static void main(String[] args) throws IllegalArgumentException, IllegalAccessException, SecurityException,
NoSuchMethodException, InvocationTargetException, ClassNotFoundException, IOException {
PojoBeanAnnotationValiditer.setPojoBeanPackageName(new String[] { "com.javaest.validity.test.pojo" });
PojoBeanAnnotationValiditer.setJsValiditerFilePath("JS\\VALIDITY");
PojoBeanAnnotationValiditer
.loadAllClassAnnotationValidityInfoInPackage(new String[] { "com.javaest.validity.test.pojo" });
Student aStudent = new Student();
aStudent.setAddress("吉林省长春市二道区");
aStudent.setId("");
aStudent.setAge("9");
ValidityResult validityResult = PojoBeanAnnotationValiditer.validity(aStudent);
}
}
下边是一个加好了标注的Student类
- public class Student {
- @CanNotNull
- @FieldDesc("姓名")
- private String name;
- @CanNotNull
- @FieldDesc("性别")
- private String sex;
- @IsInteger(minValue=18,maxValue=60)
- @CanNotNull
- @FieldDesc("年龄")
- private String age;
- @CanNotNull
- @FieldDesc("编码")
- private String id;
- private String address;
- public String getName() {
- return name;
- }
- public void setName(String name) {
- this.name = name;
- }
- public String getSex() {
- return sex;
- }
- 。。。。。。。。。。
- }
在家闲着写代码真好。
posted on 2008-04-17 09:37
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