src/com/tm/common/wechat/pay/util/Md5Util.java

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package com.tm.common.wechat.pay.util;

import java.security.MessageDigest;

public class Md5Util {
	/*** 
     * MD5 
     */  
   
    public static String md5(String srcStr){
		return hash("MD5", srcStr).toUpperCase();
	}
    public static String hash(String algorithm, String srcStr) {
		try {
			MessageDigest md = MessageDigest.getInstance(algorithm);
			byte[] bytes = md.digest(srcStr.getBytes("utf-8"));
			return toHex(bytes);
		}
		catch (Exception e) {
			throw new RuntimeException(e);
		}
	}
    private static final char[] HEX_DIGITS = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
	private static String toHex(byte[] bytes) {
		StringBuilder ret = new StringBuilder(bytes.length * 2);
		for (int i=0; i<bytes.length; i++) {
			ret.append(HEX_DIGITS[(bytes[i] >> 4) & 0x0f]);
			ret.append(HEX_DIGITS[bytes[i] & 0x0f]);
		}
		return ret.toString();
	}
}