java socket通信BufferedWriter.readLine()遇到的問題

寫了個簡單的socket通信

Server.java

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.ServerSocket;
import java.net.Socket;
 
public class Server {
   public static void main(String[] args) {
      try {
         ServerSocket ss = new ServerSocket(8888);
         System.out.println("啓動服務器....");
         Socket s = ss.accept();
         System.out.println("客戶端:"+s.getInetAddress().getLocalHost()+"已連接到服務器");
         
         BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream()));
         //讀取客戶端發送來的消息
         String mess = br.readLine();
         System.out.println("客戶端："+mess);
         BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
         bw.write(mess+"\n");
         bw.flush();
      } catch (IOException e) {
         e.printStackTrace();
      }
   }
}

Client.java

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.Socket;
import java.net.UnknownHostException;
 
public class Client {
   public static void main(String[] args) {
      try {
         Socket s = new Socket("127.0.0.1",8888);
         
         //構建IO
         InputStream is = s.getInputStream();
         OutputStream os = s.getOutputStream();
         
         BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(os));
         //向服務器端發送一條消息
         bw.write("測試客戶端和服務器通信，服務器接收到消息返回到客戶端\n");
         bw.flush();
         
         //讀取服務器返回的消息
         BufferedReader br = new BufferedReader(new InputStreamReader(is));
         String mess = br.readLine();
         System.out.println("服務器："+mess);
      } catch (UnknownHostException e) {
         e.printStackTrace();
      } catch (IOException e) {
         e.printStackTrace();
      }
   }
}

其中發現br.readLine()讀取是阻塞,原因是readLine()讀取到換行或者流關閉纔會返回,所以需要在後邊加/n