unicode转码，如：u6d4bu8bd5转成中文“测试”

 1 　　public static void main(String[] args) {
 2         String s = "测试";
 3         String tt = gbEncoding(s); // String tt1 = "你好，我想给你说一个事情";
 4         System.err.println(s + " to unicode :" + tt);
 5         System.err.println(tt + " decode unicode :" + decodeUnicode(tt));
 6     }
 7 
 8     public static String gbEncoding(final String gbString) {
 9         char[] utfBytes = gbString.toCharArray();
10         String unicodeBytes = "";
11         for (int byteIndex = 0; byteIndex < utfBytes.length; byteIndex++) {
12             String hexB = Integer.toHexString(utfBytes[byteIndex]);
13             if (hexB.length() <= 2) {
14                 hexB = "00" + hexB;
15             }
16             unicodeBytes = unicodeBytes + "\u" + hexB;
17         }
18         return unicodeBytes;
19     }
20 
21     public static String decodeUnicode(final String dataStr) {
22         int start = 0;
23         int end = 0;
24         final StringBuffer buffer = new StringBuffer();
25         while (start > -1) {
26             end = dataStr.indexOf("\u", start + 2);
27             String charStr = "";
28             if (end == -1) {
29                 charStr = dataStr.substring(start + 2, dataStr.length());
30             } else {
31                 charStr = dataStr.substring(start + 2, end);
32             }
33             char letter = (char) Integer.parseInt(charStr, 16); // 16进制parse整形字符串。
34             buffer.append(new Character(letter).toString());
35             start = end;
36         }
37         return buffer.toString();
38     }