MD5加密方式(二) -- 不加盐值

package com.lzj.www.md5.test;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import org.junit.Test;
/*
 * MD5 算法(不带盐值)
*/
public class MD5 {
    
	private static final String[] GOAL = { "0", "1", "2", "3", "4", "5",
		"6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
	
	public String getMD5(String object){
		String result = null;
		try {
			MessageDigest digest = MessageDigest.getInstance("MD5");
			//--> digest.digest(object.getBytes()) 目标！！只要转成16进制的字符串即可
			result = byteArrayToString(digest.digest(object.getBytes()));
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		}
		return result.toUpperCase();
	}
	
	private String byteArrayToString(byte[] object){
		StringBuffer ss = new StringBuffer();
　　　　　　　　　　 //实现把每个字节变成对应的16进制数


		for(int i = 0; i < object.length; i++){
			ss.append(byteToString(object[i]));
		}
		return ss.toString();
	}
	
　　　　　	private String byteToString(byte object){
		int temp = object < 0 ? object + 256 : object;	//取正，再匹配下标即可
		return GOAL[temp / 16] + GOAL[temp % 16];
	}
	
	@Test
	public void test(){
		System.out.println(getMD5("hello"));
	}
}