Java如何实现简单后台访问并获取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();
 }
}

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();

}
 }
}

后台接收的信息

客户端接收的信息

来源：https://www.cnblogs.com/wangchw/p/13831283.html