客户端服务器应用程序不能正常工作

Question

我正在尝试编写一个简单的客户端/服务器Echo应用程序，我的客户端似乎在发送输入，但服务器似乎并未将其接收并发回。

这里的服务器：

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

public class Server 
{ 
    public static void main(String args[]) throws Exception 
    { 
     int port = 2000; 
     ServerSocket serverSocket; 
     Socket client; 

     BufferedReader is = null; 
     BufferedWriter os = null; 

     serverSocket = new ServerSocket(port); 
     System.err.println("Server established on port " + port); 

     client = serverSocket.accept(); 
     System.err.println("Client connected"); 

     is = new BufferedReader(
       new InputStreamReader(client.getInputStream())); 
     os = new BufferedWriter(
       new OutputStreamWriter(client.getOutputStream())); 
     System.err.println("Server established on port " + port); 

     String message = ""; 

     while((message = is.readLine()) != null) 
     { 
      System.err.println("Messaged received " + message); 
      os.write(message); 
     } 

     is.close(); 
     os.close(); 
     serverSocket.close(); 
    } 
} 

然后，客户看起来是这样的：

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

public class Client 
{ 
    public static void main(String args[]) throws Exception 
    { 
     String host = "localhost"; 
     int port = 2000; 
     Socket socket; 

     socket = new Socket(host, port); 

     BufferedReader is = new BufferedReader(
       new InputStreamReader(socket.getInputStream())); 
     BufferedWriter os = new BufferedWriter(
       new OutputStreamWriter(socket.getOutputStream())); 
     System.err.println("Connected to " + host + " on port " + port); 

     BufferedReader br = 
       new BufferedReader(new InputStreamReader(System.in)); 

     String input = ""; 

     while((input = br.readLine()) != null) 
     { 
      System.out.println("Sending " + input); 
      os.write(input); 
      System.out.println("Receiving " + is.read()); 
     } 

     is.close(); 
     os.close(); 
     socket.close(); 
    } 
} 

我缺少什么，我相信我可以俯瞰简单的东西。

Answer 1

在客户端尝试用最后的换行字符写入消息：

os.write(input+"\n"); 

（或调用也newLine()）

，由于服务器读取行由行。