使用MD5对密码进行加密

package com.sun.utils;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class PasswordUtil {

public static String md5s(String plainText) {

try {

MessageDigest md = MessageDigest.getInstance("MD5");
md.update(plainText.getBytes());
byte b[] = md.digest();
int i;
StringBuffer buf = new StringBuffer("");
for (int offset = 0; offset < b.length; offset++) {
i = b[offset];
if (i < 0)
i += 256;
if (i < 16)
buf.append("0");
buf.append(Integer.toHexString(i));
}
// System.out.println("result: " + buf.toString()); //32位的加密
// System.out.println("result: " + buf.toString().substring(8,24));//16位的加密
return buf.toString();

} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
return null;
}
}

public static void main(String agrs[]) {
System.out.println(PasswordUtil.md5s("admin")); // 加密 }
}