java socket编程

java的socket编程跟python的很像 而且也很方便 简单记录一下 同时server那边的accept也是阻塞的

connect函数可以在初始化一个socket对象之后 一般客户端可以用来链接服务端 但是如果在socket构造函数那里传入serverName和port 也是可以在初始化的时候进行连接的

服务端

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

public class JServer extends Thread {
    private ServerSocket server;
    public JServer(int port) throws IOException {
        server = new ServerSocket(port);
        server.setSoTimeout(10000);
    }
    public void run() {
        while (true) {
            try {
                System.out.println("等待客户端连接");
                Socket s = server.accept();
                System.out.println("远程连接地址 " + s.getRemoteSocketAddress());
                DataInputStream in = new DataInputStream(s.getInputStream());
                System.out.println("接受数据" + in.readUTF());
                DataOutputStream out = new DataOutputStream(s.getOutputStream());
                out.writeUTF("我接收到了 拜拜");
                s.close();
            } catch (IOException i) {
                i.printStackTrace();
            }
        }
    }
    public static void main(String[] args) throws IOException {
        JServer JS = new JServer(5000);
        JS.run();
    }
}

客户端

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;

public class JClient extends Thread {
    private Socket client;
    public JClient(String serverName, int port) throws IOException {
        client = new Socket(serverName, port);
    }
    public void run() {
        try {
            System.out.println("现在开始连接服务端");
            DataOutputStream out = new DataOutputStream(client.getOutputStream());
            out.writeUTF("我是客户端 服务端你那边接收到我发的信息了没");
            DataInputStream in = new DataInputStream(client.getInputStream());
            System.out.println("从服务端接受到 " + in.readUTF());
            client.close();
        } catch (IOException i) {
            i.printStackTrace();
        }
    }
    public static void main(String[] args) throws IOException {
        JClient client = new JClient("127.0.0.1", 5000);
        client.run();
    }
}

结果