Java Socket通信实例

2023-08-23 08:07:04

一、简单的客户端与服务器一对一连接：

Socket通信的步骤：

1、创建ServerSocket和Socket

2、打开连接到Scket的输入/输出流

3、按照协议对Socket进行读/写操作

4、关闭输入输出流、关闭Socket

废话不多说，直接上代码，服务端和客户端的注释写的很清楚！！！

package com.socket;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.io.PrintWriter;

import java.net.ServerSocket;

import java.net.Socket;

public class Server {

    public static void main(String[] args) {

        try {

            // 1.创建服务器端Socket对象，绑定并监听窗口

            ServerSocket serverSocket = new ServerSocket(8888);

            System.out.println("服务器已启动，等待客户端连接...");

            // 2.调用accept()方法开始监听，等待客户端连接

            Socket socket = serverSocket.accept();

            // 3.获取输入流，并读取客户端信息

            InputStream inputStream = socket.getInputStream();

            InputStreamReader inputStreamReader = new InputStreamReader(inputStream);// 将字节流转换为字符流

            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

            String temp = null;

            String info = "";

            while ((temp = bufferedReader.readLine()) != null) {

                info += temp;

                System.out.println("已收到客户端连接");

                System.out.println("服务端接收到客户端信息：" + info + "当前客户端ip:" + socket.getInetAddress().getHostAddress());

            }

            // 4.获取输出流，响应客户端的请求

            OutputStream outputStream = socket.getOutputStream();

            PrintWriter printWriter = new PrintWriter(outputStream);

            printWriter.print("你好服务端已收到您的信息");

            printWriter.flush();// 强行将缓冲区的数据输出

            socket.shutdownOutput();// 关闭输出流

            // 5.关闭对应的资源

            printWriter.close();

            outputStream.close();

            bufferedReader.close();

            inputStream.close();

            inputStreamReader.close();

            socket.close();

            serverSocket.close();

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

}

package com.socket;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.io.PrintWriter;

import java.net.Socket;

public class Client {

    public static void main(String[] args) {

        try {

            // 1.创建客户端Socket，制定服务器地址和端口

            Socket socket = new Socket("localhost", 8888);

            // 2.获取输出流，向服务端发送信息

            OutputStream outputStream = socket.getOutputStream();// 字节输出流

            PrintWriter printWriter = new PrintWriter(outputStream);// 将输出流包装成打印流

            printWriter.print("服务端你好，我是zz");// 内容

            printWriter.flush();// 强制将缓冲区的数据输出

            socket.shutdownOutput();// 关闭输出流

            // 3.获取输入流，并读取服务器端的响应信息

            InputStream inputStream = socket.getInputStream();// 获取一个输入流，接收服务端的信息

            InputStreamReader inputStreamReader = new InputStreamReader(inputStream);// 包装成字符流，提高效率

            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);// 缓冲区

            String info = "";

            String temp = null;// 临时变量

            while ((temp = bufferedReader.readLine()) != null) {

                info += temp;

                System.out.println("客户端发送的消息为：" + info);

            }

            // 4.关闭相对应的资源

            bufferedReader.close();

            inputStream.close();

            printWriter.close();

            outputStream.close();

            socket.close();

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

}

输出的结果为：

客户端发送的消息为：你好服务端已收到您的信息

服务器已启动，等待客户端连接...
已收到客户端连接
服务端接收到客户端信息：服务端你好，我是zz当前客户端ip:127.0.0.1

二、多个客户端与服务器连接：

package com.threadsocket;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.io.PrintWriter;

import java.net.Socket;

public class SocketThread extends Thread{

    private Socket socket;

    public SocketThread(Socket socket) {

        this.socket = socket;

    }

    public void run() {

        //根据输入输出流和客户端连接

        try {

            InputStream inputStream = socket.getInputStream();

            //得到一个输入流，接收客户端传递的信息

            InputStreamReader inputStreamReader = new InputStreamReader(inputStream);//提高效率将字节流转化为字符流

            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);//加入缓冲区

            String temp = null;

            String info = "";

            while((temp = bufferedReader.readLine())!=null) {

                info+=temp;

                System.out.println("已接收到客户端连接");

                System.out.println("服务端接收到客户端信息："+info+"当前客户端ip为："+socket.getInetAddress().getHostAddress());

            }

            OutputStream outputStream = socket.getOutputStream();//获得一个输出流向服务端发送信息

            PrintWriter printWriter = new PrintWriter(outputStream);//将输出流包装成打印流

            printWriter.flush();

            socket.shutdownOutput();//关闭输出流

            //关闭相对应的资源

            bufferedReader.close();

            inputStream.close();

            printWriter.close();

            outputStream.close();

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

}

package com.threadsocket;

import java.io.IOException;

import java.net.ServerSocket;

import java.net.Socket;

public class Server {

    public static void main(String[] args) {

        try {

            ServerSocket serverSocket = new ServerSocket(8888);

            System.out.println("服务端已启动，等待客户端连接...");

            while(true) {

                Socket socket = serverSocket.accept();//侦听并接收到此套接字的连接返回一个Socket对象

                SocketThread socketThread = new SocketThread(socket);

                socketThread.start();

            }

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

}

package com.threadsocket;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.io.PrintWriter;

import java.net.Socket;

import java.net.UnknownHostException;

public class Client {

    public static void main(String[] args) {

        try {

            // 创建Socekt对象

            Socket socket = new Socket("localhost", 8888);

            // 根据输入输出流和服务端连接

            OutputStream outputStream = socket.getOutputStream();// 获取一个输出流向服务端发送信息

            PrintWriter printWriter = new PrintWriter(outputStream);

            printWriter.print("服务端你好，我是客户1");

            printWriter.flush();

            socket.shutdownOutput();// 关闭输出流

            InputStream inputStream = socket.getInputStream();// 获取一个输入流，接收服务端的信息

            InputStreamReader inputStreamReader = new InputStreamReader(inputStream);// 包装成字符流，提高效率

            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);// 缓冲区

            String info = "";

            String temp = null;// 临时变量

            while ((temp = bufferedReader.readLine()) != null) {

                info += temp;

                System.out.println("客户端接收服务端发送信息：" + info);

            }

            // 关闭相对应的资源

            bufferedReader.close();

            inputStream.close();

            printWriter.close();

            outputStream.close();

            socket.close();

        } catch (UnknownHostException e) {

            e.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

}

package com.threadsocket;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.io.PrintWriter;

import java.net.Socket;

import java.net.UnknownHostException;

public class Client2 {

    public static void main(String[] args) {

        try {

            // 创建Socekt对象

            Socket socket = new Socket("localhost", 8888);

            // 根据输入输出流和服务端连接

            OutputStream outputStream = socket.getOutputStream();// 获取一个输出流向服务端发送信息

            PrintWriter printWriter = new PrintWriter(outputStream);

            printWriter.print("服务端你好，我是客户2");

            printWriter.flush();

            socket.shutdownOutput();// 关闭输出流

            InputStream inputStream = socket.getInputStream();// 获取一个输入流，接收服务端的信息

            InputStreamReader inputStreamReader = new InputStreamReader(inputStream);// 包装成字符流，提高效率

            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);// 缓冲区

            String info = "";

            String temp = null;// 临时变量

            while ((temp = bufferedReader.readLine()) != null) {

                info += temp;

                System.out.println("客户端接收服务端发送信息：" + info);

            }

            // 关闭相对应的资源

            bufferedReader.close();

            inputStream.close();

            printWriter.close();

            outputStream.close();

            socket.close();

        } catch (UnknownHostException e) {

            e.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

}

运行结果：

服务端已启动，等待客户端连接...
已接收到客户端连接
服务端接收到客户端信息：服务端你好，我是客户2当前客户端ip为：127.0.0.1
已接收到客户端连接
服务端接收到客户端信息：服务端你好，我是客户1当前客户端ip为：127.0.0.1

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