md5加密（java 代码实现）

MD5的加密实现代码

package com.test.util;

import java.security.*;

import java.security.spec.*;

public class md5 {

public final static String MD5(String s) {

char hexDigits[] = {

'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd',

'e', 'f'};

try {

byte[] strTemp = s.getBytes();

MessageDigest mdTemp = MessageDigest.getInstance("MD5");

mdTemp.update(strTemp);

byte[] md = mdTemp.digest();

int j = md.length;

char str[] = new char[j * 2];

int k = 0;

for (int i = 0; i < j; i++) {

byte byte0 = md[i];

str[k++] = hexDigits[byte0 >>> 4 & 0xf];

str[k++] = hexDigits[byte0 & 0xf];

}

return new String(str);

}

catch (Exception e) {

return null;

}

}

}

调用代码为：

password = md5.Md5(password);