java实现MD5加密

package com.message.utils;

import java.security.MessageDigest;

/**
* md5加密工具类
* @author xiatianlong
*
* @date 2016年4月11日 下午1:51:47
*/
public class MD5Util {

public static String MD5Psw(String psw) {
String ret = "";
try {
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(psw.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));
}
ret = buf.toString();
// System.out.println("MD5(" + psw + ",32) = " + ret);
// System.out.println("MD5(" + psw + ",16) = "+
// buf.toString().substring(8, 24));
} catch (Exception e) {
e.printStackTrace();
return ret;
}
return ret;
}
}