java实现无符号数转换、字符串补齐、md5、uuid、随机数示例

　　package com.hongyuan.test;

　　import java.security.MessageDigest;

　　import java.security.NoSuchAlgorithmException;

　　import java.util.Random;

　　import java.util.UUID;

　　/*

　　* 杂项(无符号数转换，字符串补齐，md5,uuid,随机数)

　　*/

　　public class SundryTest {

　　//转成无符号数

　　public static Number toUnsignedNumber(Number num){

　　if(num instanceof Byte){

　　return (Byte)num & 0xff;

　　}else if(num instanceof Short){

　　return (Short)num & 0xffff;

　　}else if(num instanceof Integer){

　　return (Integer)num & 0xffffffffL;

　　}else{

　　return -1;

　　}

　　}

　　//左补齐

　　public static String leftPad(String str,String pad,int len){

　　String newStr=(str==null?"":str);

　　while(newStr.length()

　　newStr=pad+newStr;

　　}

　　if(newStr.length()>len){

　　newStr=newStr.substring(newStr.length()-len);

　　}

　　return newStr;

　　}

　　//右补齐

　　public static String rightPad(String str,String pad,int len){

　　String newStr=(str==null?"":str);

　　while(newStr.length()

　　newStr=newStr+pad;

　　}

　　if(newStr.length()>len){

　　newStr=newStr.substring(0, len);

　　}

　　return newStr;

        http:// 23.27.118.253;

　　}

　　//md5

　　public static String md5(String str){

　　StringBuilder sb=new StringBuilder();

　　try {

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

　　byte[] message=digest.digest(str.getBytes());

        http://23.27.118.254 

　　for(int i=0;i

　　sb.append(leftPad( //左补齐

　　Integer.toHexString( //转成16进制数

　　(Integer)toUnsignedNumber(message[i])), //转成无符号数

　　"0",2).toUpperCase()); //转成大写

　　}

　　} catch (NoSuchAlgorithmException e) {

　　throw new RuntimeException("不存在md5服务!");

　　}

　　return sb.toString();

　　}

　　//UUID

　　public static String uuid(){

　　return UUID.randomUUID().toString().replaceAll("-","").toUpperCase();

　　}

　　//随机数(包括min,不包括max)

　　public static int random(int min,int max){

　　if(min<=max){

　　Random random=new Random();

　　return random.nextInt(max-min)+min;

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　　}else{

　　throw new IllegalArgumentException("无法处理一个不合法的数字区间!");

　　}

　　}

　　public static void main(String[] args){

　　System.out.println("MD5(123456):"+md5("123456"));

　　System.out.println("UUID:"+uuid());

　　System.out.println("随机数："+random(1,100));

　　}