Md5加密——java代码

 1 public class StringToMD5 {
 2 
 3     private static StringBuffer sBuffer;
 4 
 5     public static String getMD5Code(String str) {
 6         MessageDigest md;
 7         try {
 8             // md.digest() 该函数返回值为存放哈希值结果的byte数组
 9             md = MessageDigest.getInstance("MD5");
10             byte[] md5Bytes = md.digest(str.getBytes());
11             sBuffer = new StringBuffer();
12             for (int i = 0; i < md5Bytes.length; i++) {
13                 int val = ((int) md5Bytes[i]) & 0xff;
14                 if (val < 16)
15                     sBuffer.append("0");
16                 sBuffer.append(Integer.toHexString(val));
17             }
18             return sBuffer.toString();
19         } catch (NoSuchAlgorithmException e) {
20             e.printStackTrace();
21         }
22         return "";
23     }
24 }