Java的Socket通信简单实例

服务端

package testlxd;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;

public class Server_Test extends Thread {
    ServerSocket server = null;
    Socket socket = null;

    public Server_Test(int port) {
        try {
            server = new ServerSocket(port);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void run() {

        super.run();
        try {
            System.out.println(getdate() + "  等待客户端连接...");
            socket = server.accept();
            new sendMessThread().start();// 连接并返回socket后，再启用发送消息线程
            System.out.println(getdate() + "  客户端 （" + socket.getInetAddress().getHostAddress() + "） 连接成功...");
            InputStream in = socket.getInputStream();
            int len = 0;
            byte[] buf = new byte[1024];
            while ((len = in.read(buf)) != -1) {
                System.out.println(getdate() + "  客户端: （"
                        + socket.getInetAddress().getHostAddress() + "）说："
                        + new String(buf, 0, len, "UTF-8"));
            }

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

    public static String getdate() {
        Date date = new Date();
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
        String result = format.format(date);
        return result;
    }

    class sendMessThread extends Thread {
        @Override
        public void run() {
            super.run();
            Scanner scanner = null;
            OutputStream out = null;
            try {
                if (socket != null) {
                    scanner = new Scanner(System.in);
                    out = socket.getOutputStream();
                    String in = "";
                    do {
                        in = scanner.next();
                        out.write(("" + in).getBytes("UTF-8"));
                        out.flush();// 清空缓存区的内容
                    } while (!in.equals("q"));
                    scanner.close();
                    try {
                        out.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            } catch (IOException e) {
                e.printStackTrace();
            }

        }

    }

    // 函数入口
    public static void main(String[] args) {
        Server_Test server = new Server_Test(1234);
        server.start();
    }
}

客户端

package testlxd;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;

public class Client extends Thread {

    //定义一个Socket对象
    Socket socket = null;

    public Client(String host, int port) {
        try {
            //需要服务器的IP地址和端口号，才能获得正确的Socket对象
            socket = new Socket(host, port);
        } catch (UnknownHostException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    @Override
    public void run() {
        //客户端一连接就可以写数据给服务器了
        new sendMessThread().start();
        super.run();
        try {
            // 读Sock里面的数据
            InputStream s = socket.getInputStream();
            byte[] buf = new byte[1024];
            int len = 0;
            while ((len = s.read(buf)) != -1) {
                System.out.println(getdate() + "  服务器说：  "+new String(buf, 0, len,"UTF-8"));
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //往Socket里面写数据，需要新开一个线程
    class sendMessThread extends Thread{
        @Override
        public void run() {
            super.run();
            //写操作
            Scanner scanner=null;
            OutputStream os= null;
            try {
                scanner=new Scanner(System.in);
                os= socket.getOutputStream();
                String in="";
                do {
                    in=scanner.next();
                    os.write((""+in).getBytes());
                    os.flush();
                } while (!in.equals("bye"));
            } catch (IOException e) {
                e.printStackTrace();
            }
            scanner.close();
            try {
                os.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    public static String getdate() {
        Date date = new Date();
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
        String result = format.format(date);
        return result;
    }

    //函数入口
    public static void main(String[] args) {
        //需要服务器的正确的IP地址和端口号
        Client clientTest=new Client("127.0.0.1", 1234);
        clientTest.start();
    }
}

运行效果：

服务端

客户端

以上就是Socket的简单通信实例，实际开发过程按需修改即可，若遇到乱码问题，可尝试通过以下代码进行修改

in = new BufferedReader(new InputStreamReader(socket.getInputStream(),"UTF-8"));
out = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(),"UTF-8"));