package com.hongyuan.test;

import java.security.messagedigest;

import java.security.nosuchalgorithmexception;

import java.util.random;

import java.util.uuid;

/*

* 雜項(xiàng)(無符號數(shù)轉(zhuǎn)換，字符串補(bǔ)齊，md5,uuid,隨機(jī)數(shù))

*/

public class sundrytest {

//轉(zhuǎn)成無符號數(shù)

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;

}

}

//左補(bǔ)齊

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;

}

//右補(bǔ)齊

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;

}

//md5

public static string md5(string str){

stringbuilder sb=new stringbuilder();

try {

messagedigest digest = messagedigest.getinstance("md5");

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

for(int i=0;i

sb.append(leftpad(???????????//左補(bǔ)齊

integer.tohexstring(??????//轉(zhuǎn)成16進(jìn)制數(shù)

(integer)tounsignednumber(message[i])),?//轉(zhuǎn)成無符號數(shù)

"0",2).touppercase());???????//轉(zhuǎn)成大寫

}

} catch (nosuchalgorithmexception e) {

throw new runtimeexception("不存在md5服務(wù)！");

}

return sb.tostring();

}

//uuid

public static string uuid(){

return uuid.randomuuid().tostring().replaceall("-","").touppercase();

}

//隨機(jī)數(shù)(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;

}else{

throw new illegalargumentexception("無法處理一個(gè)不合法的數(shù)字區(qū)間！");

}

}

public static void main(string[] args){

system.out.println("md5(123456):"+md5("123456"));

system.out.println("uuid:"+uuid());

system.out.println("隨機(jī)數(shù)："+random(1,100));

}

}

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