java MD5数据加密工具类

package com.wetuo.util;

import java.security.MessageDigest;

/**
* 数据加密工具类
* @author wzp
*
*/
public class DataUtil {
public static String md5(String str) {
StringBuffer buffer = new StringBuffer();
char[] chars = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A',
'B', 'C', 'D', 'E', 'F' };
byte[] input = str.getBytes();
try {
MessageDigest md = MessageDigest.getInstance("MD5");
byte[] bytes = md.digest(input);
for (byte b : bytes) {
// 高四位后移 按位与 0000 1111
buffer.append(chars[(b >> 4) & 0x0F]);
// 低四位直接 按位与 0000 1111
buffer.append(chars[b & 0x0f]);
}
return buffer.toString();
} catch (Exception e) {
// TODO: handle exception
}
return null;
}

}