工具类：MD5加密

package com.hengshan.yundonggo.util;

import java.security.MessageDigest;

/**

 * MD5加密工具类

 * 

 * @author dgy

 * @date 2015-3-10

 */

public class MD5Util {

/**

* 把字符串编码成MD5

* 

* @return

*/

public final static String toMD5(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;

}

}

public static void main(String[] args) {

System.out.println(toMD5("888888"));

}

}