使用socket 将服务器端和客户端通信的例子_new serversocket(port)和new socket可以支持客户端和服务器之间的持续交-优快云博客

本文介绍了一个简单的Java网络编程示例，包括服务器端和客户端代码。通过该示例，读者可以了解如何使用Java实现基本的网络通信，具体涵盖了ServerSocket、Socket类的应用，以及输入输出流的处理。

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1：服务器端代码

import java.io.BufferedReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.*;
import java.util.*;
import java.io.*;
public class ServerTest {
	final static int SERVER_PORT = 8001;
	public static void main(String[] args) {
		Server server;
		String clientRequest;
		BufferedReader reader;
		PrintWriter writer;
		
		server = new Server(SERVER_PORT);
		reader = new BufferedReader(new InputStreamReader(server.in));
		writer = new PrintWriter(new OutputStreamWriter(server.out),true);
		writer.println("java test server v0.03"+ new Date());
		while(true){
			try{
				clientRequest = reader.readLine();
				System.out.println("client says:"+clientRequest);
				if(clientRequest.startsWith("HELP")){
					writer.println(" vocabulary:HELP QUIT");
				}else{
					if(clientRequest.startsWith("QUIT")){
						System.exit(0);
					}else{
						writer.println("err : command "+clientRequest+"not understood");
					}
				}
			}catch(IOException e){
				System.out.println("IOEx IN server" + e);
			}
		}
		
	}
	
}
class Server{
	private ServerSocket server;
	private Socket socket;
	public InputStream in;
	public OutputStream out;
	public Server(int port){
		try {
			server = new ServerSocket(port);
			System.out.println("serverSocket before accept:"+server);
			System.out.println("java test server v0.03,on-line!");
			socket = server.accept();
			System.out.println("serversocket after accept:"+server);
			in = socket.getInputStream();
			out = socket.getOutputStream();
		} catch (IOException e1) {
			System.out.println("server constructor IOEx:"+e1);
		}
	}
	
}

2：客户端代码

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;


public class ClientTest {
	public static void main(String[] args) {
		String welcome,response;
		Client client;
		BufferedReader reader;
		PrintWriter writer;
		client = new Client("localhost",8001);
		
		try {
			reader = new BufferedReader(new InputStreamReader(client.in));
			writer = new PrintWriter(new OutputStreamWriter(client.out),true);
			welcome = reader.readLine();
			System.out.println("server says:"+ welcome);
			System.out.println("HELP");
			writer.println("HELP");
			response = reader.readLine();
			System.out.println("server responds："+response);
			System.out.println("QUIT");
			writer.println("QUIT");
		} catch (IOException e) {
			System.out.println("IOException in client.in.readln()");
			e.printStackTrace();
		}
		try{
			Thread.sleep(2000);
		}catch(Exception ignored){}
	}
}

class Client{
	public InputStream in;
	public OutputStream out;
	private Socket client;
	
	public Client(String host,int port){
		try {
			client  = new Socket(host,port);
			System.out.println("client socket:"+ client);
			in = client.getInputStream();
			out = client.getOutputStream();
		} catch (UnknownHostException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}

3：先运行客户端，再运行客户端。便可看到通信结果