java中MD5加密Demo

package com.iask.base.md5;

import java.security.MessageDigest;

/**

* md5加密

*

* @author 李正

*

*/

public class MD5 {

public final static String encode(String str) {

return encodeMd5(str);

}

private final static String encodeMd5(String s) {

char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',

'A', 'B', 'C', 'D', 'E', 'F' };

try {

byte[] btInput = s.getBytes();

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

mdInst.update(btInput);

byte[] md = mdInst.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) {

e.printStackTrace();

return null;

}

}

public static void main(String agrs[]) {

String md2 = encode("123456");

System.out.println(md2);

}

}