Socket的网络编程和URLDecoder类和URLEncoder类

URLDecoder类和URLEncoder类

URLDecoder类包含一个decode（String s,String enc）静态方法，它可以看上去是乱码的特殊字符串转化成普通字符。

URLEncoder类包含一个encode（String s,String enc）静态方法，它可以看上去是普通字符字符串转化成application/x-www-from-urlencoded MIME。

编写程序，乱码的特殊字符串转化成普通字符。及普通字符字符串转化成application/x-www-from-urlencoded MIME

package com;

import java.io.UnsupportedEncodingException;

import java.net.URLDecoder;

import java.net.URLEncoder;

public class TestNet4 {

public static void main(String[] args) {

// TODO Auto-generated method stub

try{String str1=URLDecoder.decode("java%E5%BC%80%E5%8F%91","UTF-8");

System.out.println(str1);

String str2=URLEncoder.encode("java程序开发","UTF-8");

System.out.println(str2);

}catch(UnsupportedEncodingException e){

System.out.println(e.getMessage());

}

}

}

Socket的网络编程

编写编程：

package com;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.InetAddress;

import java.sql.SQLException;

public class TestNet5 {//发送端代码

public static void main(String[] args) {

// TODO Auto-generated method stub

try{

DatagramSocket ds=new DatagramSocket();//创建socket对象

String str="hello,world!!";//要发送的内容

DatagramPacket dp=new DatagramPacket(str.getBytes(),str.length(),InetAddress.getByName("192.168.13.31"),50000);

ds.send(dp);

System.out.println("发送完毕");

ds.close();

}catch(Exception e){

e.printStackTrace();

}

}

}

package com;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.SocketException;

public class TestNet6 {

public static void main(String[] args) {//接收端代码

// TODO Auto-generated method stub

try {

DatagramSocket ds=new DatagramSocket(50000);

byte[] buf=new byte[1024];

DatagramPacket dp=new DatagramPacket(buf,1024);

ds.receive(dp);

String str=new String(dp.getData(),0,dp.getLength());

String add=dp.getAddress().getHostAddress();

int port=dp.getPort();

System.out.println(str+"from"+add+":"+port);

System.out.println("获取完毕");

ds.close();

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}