Java 4---网络编程

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导读

1.计算机网络简介
2.基于TCP协议的Socket编程

计算机网络简介

计算机网络拓展

基于TCP协议的Socket编程

HandleThread.java

package com.hala.net;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;

public class HandleThread extends Thread {
	
	private Socket socket;
	BufferedReader brSocket;
	
	public HandleThread (Socket socket){
		this.socket=socket;
		try {
			//获取输入流
			//这里之所以放在构造方法里，就是要保证socket已经被赋值
			brSocket=new BufferedReader(
					new InputStreamReader(socket.getInputStream()));
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	/**
	 * 负责处理服务器和每一个客户机的交互
	 * 一个客户机一个线程
	 */
	@Override
	public void run() {
		try {
			String line=brSocket.readLine();
			System.out.println("收到："+line);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			//关闭资源
			try {
				brSocket.close();
				socket.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			
		}
	}

}

TCPServer.java

package com.hala.net;


import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

public class TCPServer {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		
		try {
			//1.创建ServerSocket,传入一个端口号
			ServerSocket serverSocket=new ServerSocket(6666);
			while(true){
				//2.接收用户的请求
				//连接成功返回socket与客户端交互，否则阻塞
				Socket socket=serverSocket.accept();
				//交互
				//getInetAddress（）返回此连接的远程IP地址 是 InetAddress对象
				//getHostAddress（）是将结果作为字符串返回
				System.out.println(socket.getInetAddress().getHostAddress()
						+"连接成功");
				
				//开辟一个新的线程，负责交互
				HandleThread thread=new HandleThread(socket);
				thread.start();
			}
			
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

}

TCPClient.java

package com.hala.net;

import java.io.IOException;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;

public class TCPClient {

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		Socket socket=null;
		PrintWriter pw=null;
		Scanner input=new Scanner(System.in);
		
		try {
			//与服务器建立连接，指定IP和端口号
			socket=new Socket("172.31.0.1",6666);
			//为socket建立一个输出通道，true的作用是刷新缓存
			pw=new PrintWriter(socket.getOutputStream(),true);
			
			while(true){
				System.out.println("请输入：");
				String line=input.next();
				pw.println(line);
				//可以多次发送的技巧
				if(line.equals("exit")){
					break;
				}
			}
			
		} catch (UnknownHostException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			if(pw!=null){
				pw.close();
			}
			
			if(socket!=null){
				try {
					socket.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
	}

}