利用线程实现客户端和服务端简单数据交互

本文链接：https://blog.youkuaiyun.com/qq_40948117/article/details/88318741

本文介绍了一个使用线程实现的简单客户端与服务端数据交互程序。客户端通过Socket连接到服务端，发送信息并接收服务端的响应。服务端接收客户端的登录信息，并向客户端返回响应。

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这是一个简单利用线程实现客户端和服务端的数据交互

package Demo01;

import jdk.internal.util.xml.impl.Input;

import java.io.*;
import java.net.Socket;
import java.util.Scanner;

/**
 * 客户端
 */
public class LoginClient {
    public static void main(String[] args) {
        while (true) {
            Socket socket = null;
            OutputStream os = null;
            InputStream is = null;
            BufferedReader br = null;
            try {
                //建立连接，指定服务器及端口
                socket = new Socket("localhost", 8800);
                //信息
                Scanner input = new Scanner(System.in);
                System.out.println("请输入:");
                String str = input.next();
                //得到输出流
                os = socket.getOutputStream();
                //写
                os.write(str.getBytes());
                socket.shutdownOutput();  //让流半关闭
                //接收服务端响应
                //得到输入流
                is = socket.getInputStream();
                //输出信息
                br = new BufferedReader(new InputStreamReader(is));
                String reply = br.readLine();
                while (reply != null) {
                    System.out.println("我是客户端，服务端响应信息为:" + reply);
                    reply = br.readLine();
                }
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    if (os != null) {
                        os.close();
                    }
                    if (socket != null) {
                        socket.close();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

package Demo01;

import jdk.internal.util.xml.impl.Input;

import java.io.*;
import java.net.Socket;
import java.util.Scanner;

/**
 * 客户端
 */
public class LoginClient1 {
    public static void main(String[] args) {
        while (true) {
            Socket socket = null;
            OutputStream os = null;
            InputStream is = null;
            BufferedReader br = null;
            try {
                //建立连接，指定服务器及端口
                socket = new Socket("localhost", 8800);
                //信息
                Scanner input = new Scanner(System.in);
                System.out.println("请输入:");
                String str = input.next();
                //得到输出流
                os = socket.getOutputStream();
                //写
                os.write(str.getBytes());
                socket.shutdownOutput();  //让流半关闭
                //接收服务端响应
                //得到输入流
                is = socket.getInputStream();
                //输出信息
                br = new BufferedReader(new InputStreamReader(is));
                String reply = br.readLine();
                while (reply != null) {
                    System.out.println("我是客户端，服务端响应信息为:" + reply);
                    reply = br.readLine();
                }
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    if (os != null) {
                        os.close();
                    }
                    if (socket != null) {
                        socket.close();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

package Demo01;

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

/**
 * 服务端
 */
public class LoginServer {
    public static void main(String[] args) {
        try {
            ServerSocket serverSocket = new ServerSocket(8800);
            while (true) {
                Socket socket=serverSocket.accept();
                //建一个服务端口
                LoginThread loginThread=new LoginThread(socket);
                loginThread.start();

            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

package Demo01;

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

public class LoginThread extends Thread {
    Socket socket = null;
    public LoginThread(Socket socket) {
        this.socket = socket;
    }
    public  void run (){
        InputStream is = null;
        BufferedReader br = null;
        OutputStream os = null;
        try {
            //得到输入流
            is = socket.getInputStream();
            //输出信息
            br = new BufferedReader(new InputStreamReader(is));
            String info = br.readLine();
            while (info != null) {
                System.out.println("我是服务端，客户端登录信息为:" + info);
                info = br.readLine();
            }
            //给客户端响应
            Scanner input = new Scanner(System.in);
            System.out.println("请输入:");
            String reply = input.next();
            //得到输出流
            os = socket.getOutputStream();
            //写
            os.write(reply.getBytes());
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (br != null) {
                    br.close();
                }
                if (is != null) {
                    is.close();
                }
                if (os != null) {
                    os.close();
                }
                if (socket != null) {
                    socket.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}