Socket通信：客户端发送数据后回显相同数据

客户端代码

package test;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;

public class Client {
    public static void main(String[] args) {
        BufferedReader br = null;
        PrintWriter pw = null;

        try {
            Socket socket = new Socket("127.0.0.1", 8800);
            br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            pw = new PrintWriter(socket.getOutputStream(), true);
            pw.println("Hello");
            String s = null;
            while (true) {
                s = br.readLine();
                if (s != null) {
                    break;
                }
            }
            System.out.println(s);
        }catch (Exception ex){
            ex.printStackTrace();
        }finally {
            try{
                br.close();
                pw.close();
            }catch (Exception ex){
                ex.printStackTrace();
            }
        }
    }
}

服务端代码

package cool.islj;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {
    public static void main(String[] args){
        BufferedReader br = null;
        PrintWriter pw = null;
        try{
            ServerSocket server = new ServerSocket(8800);
            Socket socket = server.accept();
            br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            pw = new PrintWriter(socket.getOutputStream(),true);
            // 读取，然后再发送回去
            String s = br.readLine();
            pw.println(s);
        }catch (Exception ex){
            ex.printStackTrace();
        }finally {
            try{
                br.close();
                pw.close();
            }catch (Exception ex){
                ex.printStackTrace();
            }
        }
    }
}