1 /**
2 * md5签名
3 * @param plainText 要签名的字符串
4 * @param enc 要编译的格式 gbk；utf-8
5 * @return
6 */
7 public static String MD5(String plainText,String enc) {
8 String re_md5 = new String();
9 try {
10 MessageDigest md = MessageDigest.getInstance("MD5");
11 md.update(plainText.getBytes(enc));
12 byte b[] = md.digest();
13 int i;
14 StringBuffer buf = new StringBuffer("");
15 for (int offset = 0; offset < b.length; offset++) {
16 i = b[offset];
17 if (i < 0)
18 i += 256;
19 if (i < 16)
20 buf.append("0");
21 buf.append(Integer.toHexString(i));
22 }
23 re_md5 = buf.toString();
24 } catch (Exception e) {
25 e.printStackTrace();
26 }
27 return re_md5;
28
29
30 }
