MD5

 1 public class MD5 {
 2     
 3     // 全局数组
 4     private final static String[] strDigits = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
 6 
 7     // 返回形式为数字跟字符串
 8     private static String byteToArrayString(byte bByte) {
 9         int iRet = bByte;
11         if (iRet < 0) {
12             iRet += 256;
13         }
14         int iD1 = iRet / 16;
15         int iD2 = iRet % 16;
16         return strDigits[iD1] + strDigits[iD2];
17     }
18 
19     // 转换字节数组为16进制字串
20     private static String byteToString(byte[] bByte) {
21         StringBuffer sBuffer = new StringBuffer();
22         for (int i = 0; i < bByte.length; i++) {
23             sBuffer.append(byteToArrayString(bByte[i]));
24         }
25         return sBuffer.toString();
26     }
27 
28     public static String GetMD5Code(String strObj) {
29         String resultString = null;
30         try {
31             resultString = new String(strObj);
32             MessageDigest md = MessageDigest.getInstance("MD5");
33             resultString = byteToString(md.digest(strObj.getBytes()));
34         } catch (NoSuchAlgorithmException ex) {
35             ex.printStackTrace();
36         }
37         return resultString;
38     }
39 }