java实现简单的后台访问及获取访问者IP

后台服务端

 

import java.io.IOException;
import java.io.InputStream;
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) throws IOException {
        ServerSocket s = new ServerSocket(1122);//服务器端口号
        Socket ss = s.accept();
//        获取IP访问者IP地址
        String cip = ss.getInetAddress().getHostAddress();
//         接收信息获取访问姓名身份同时向访问者问好
        String msg = String.format("%s:Hello\s\n", "wo", cip);
        OutputStream os = ss.getOutputStream();
        PrintWriter out = new PrintWriter(os);
        out.write(msg);
        out.flush();
        System.out.println("有人连线了: " + cip);
//        读取信息
        InputStream is = ss.getInputStream();
        System.out.println(new String(is.readAllBytes()));
        System.out.println(ss.isConnected());
        os.close();
    }
}

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客户端

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

public class Client {
    public static void main(String[] args) throws IOException {
        Socket client = new Socket("192.168.1.16", 1122);//服务器端口号1122，IP也可以自定义访问也可以在IP那里输入localhost访问本机
        if (client.isConnected()) {
//            接收信息
            InputStream is = client.getInputStream();
            BufferedReader br=new BufferedReader(new InputStreamReader(is));
            System.out.println(br.readLine());
//                向服务器发送个人信息
            String msg = "学生：xxx\r\n";//名字可以定义
            OutputStream os = client.getOutputStream();
            os.write(msg.getBytes());
            os.flush();
            System.out.println(client.isConnected());
            System.out.println(client.isClosed());
            is.close();
            os.close();

        }
    }
}

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后台接收的信息

客户端接收的信息