客户端无法发送消息

Question

这是一个简单的客户端-服务器程序，其中客户端发送文本，服务器在 console.This 上显示它是我的代码：

我的服务器

import java.io.*;
import java.net.*;
public class MyServer {
public static void main(String args[]) throws IOException
 {
  ServerSocket socket=new ServerSocket(4444);
  Socket s=socket.accept();
  BufferedReader in=new BufferedReader(new InputStreamReader(s.getInputStream()));

 String text;
 while(  (text=in.readLine())!=null)
  {  System.out.println(text);
   } 

 }

我的客户

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


 public class MyClient {
public static void main(String args[]) throws IOException
{ Socket socket=new Socket("localhost",4444);
PrintWriter out=new PrintWriter(socket.getOutputStream());
out.println("c:/users/pinder/desktop/happy.txt");



 }
 }

异常发生在MyServerclass中的readLine()语句中。这是我得到的异常：

Exception in thread "main" java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:209)
at java.net.SocketInputStream.read(SocketInputStream.java:141)
at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:284)
at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:326)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178)
at java.io.InputStreamReader.read(InputStreamReader.java:184)
at java.io.BufferedReader.fill(BufferedReader.java:161)
at java.io.BufferedReader.readLine(BufferedReader.java:324)
at java.io.BufferedReader.readLine(BufferedReader.java:389)
at networking.MyServer.main(MyServer.java:25)

Answer 1

A SocketException 是一个 IOException（在 main() 方法的 throws 子句中。由于您没有正确关闭连接 reader 抛出了这个错误，它是由 Launcher 打印出来的。

如果您 close() Socket 另一端正在读取连接时，您将不会收到此错误。例如

public class MyServer {
    public static void main(String args[]) throws IOException {
        try (ServerSocket socket = new ServerSocket(4444);
             Socket s = socket.accept();
             BufferedReader in = new BufferedReader(new InputStreamReader(s.getInputStream()))) {

            String text;
            while ((text = in.readLine()) != null) {
                System.out.println(text);
            }
        }
    }
}
public class MyClient {
    public static void main(String[] args) throws IOException {
        try (Socket socket = new Socket("localhost", 4444);
             PrintWriter out = new PrintWriter(socket.getOutputStream())) {
            out.println("c:/users/pinder/desktop/happy.txt");
        }
    }
}

如果我运行 MyServer 然后是 MyClient，服务器打印

 c:/users/pinder/desktop/happy.txt

客户端无法发送消息

Client not able to send message

java

sockets

client-server