纪念SUN

package cn.struts.util;

import java.util.Arrays;

/**
 * 字符编码
 */
public class URLEnCodeing {

    private static final char[] c = { '\\', '/', ':', '?', '&'};

    /**
     * URL 编码 http://localhost:8080/webproject/中国测试
     *
     * @param url http://localhost:8080/webproject/%4e2d%56fd%6d4b%8bd5
     *
     * @return
     */
    public static String escape(String url) {
 int length = url.length();
 StringBuilder sb = new StringBuilder(length);
 char currentChar;
 for (int i = 0; i < length; i++) {
     // 当前字符是不是数字,或字母,特殊字符'\\', '/', ':'
     currentChar = url.charAt(i);
     if(currentChar == 37)
  throw new RuntimeException("不能是%");
     if (currentChar <= 127) {
  sb.append(currentChar);
     } else {
  sb.append("%");
  sb.append(Integer.toString(currentChar, 16));
     }
 }

 return sb.toString();
    }

    /**
     * URL 编码 http://localhost:8080/webproject/中国测试
     *
     * @param url http://localhost:8080/webproject/%4e2d%56fd%6d4b%8bd5?time=11234566&name=%4e16%754c
     *
     * @return
     */
    public static String unEscape(String url) {
 int length = url.length();
 StringBuilder sb = new StringBuilder(length);
 String[] str = url.split("%");
 sb.append(str[0]);
 // %4e2d //"8bd5?time=11234566&name="
 for (int i = 1; i < str.length; i++) {
     String s = str[i];
     if(s.length() > 4){
  sb.append((char)Integer.parseInt(s.substring(0, 4), 16));
  sb.append(s.substring(4));
     }else
     sb.append((char) Integer.parseInt(str[i], 16));
 }
 return sb.toString();
    }

    public static void main(String[] args) {
 String value = "http://localhost:8080/webpr&oject/中国测试?time=11234566&name=世界";
 String url = "http://localhost:8080/webp25r&oject/%4e2d%56fd%6d4b%8bd5?time=11234566&name=%4e16%754c";
 System.out.println(URLEnCodeing.escape(value));
 System.out.println(URLEnCodeing.unEscape(url));
 System.out.println(Integer.toString((char)'%',16));
 

    }

}