1 import java.io.IOException;
2 import java.security.MessageDigest;
3
4 public class MD5Digestor {
5
6 public static String getMd5(String content) {
7 try {
8 MessageDigest md = MessageDigest. getInstance("MD5");
9 byte[] results = md.digest(content.getBytes());
10 return byteArrayToHexString(results);
11 } catch (Exception e) {
12 e.printStackTrace();
13 }
14 return null;
15 }
16
17 /**
18 * 轮换字节数组为十六进制字符串
19 * @param b 字节数组
20 * @return 十六进制字符串
21 */
22 private static String byteArrayToHexString( byte[] b) {
23 StringBuffer resultSb = new StringBuffer();
24 for (int i = 0; i < b. length; i++) {
25 resultSb.append( byteToHexString(b[i]));
26 }
27 return resultSb.toString();
28 }
29
30 /**
31 * 将一个字节转化成十六进制形式的字符串
32 */
33 private static String byteToHexString( byte b) {
34 System.out.println(b);
35 int n = b;
36 if (n < 0) {
37 n = 256 + n;
38 }
39 int d1 = n / 16;
40 int d2 = n % 16;
41 return HEXDIGITS[d1] + HEXDIGITS[d2];
42 }
43
44 private static final String[] HEXDIGITS = { "0", "1", "2", "3", "4" , "5" , "6" , "7" , "8" , "9" ,
45 "A", "B", "C", "D", "E", "F" };
46
47 public static void main (String[] args) throws IOException {
48 String mKey = "DcdOplConfig.getInstance().getClientVersion()"
49 + "DcdOplConfig.getInstance().getPassword()" ;
50 System. out.println( getMd5(mKey));
51 }
52
53 }
