Java 套接字关闭异常

Socket closed exception

提问by Abhilash

I wrote a simple server and client example as below .

我写了一个简单的服务器和客户端示例，如下所示。

Client :

客户 ：

• Open a connection
• Get outputstream , write to stream and close the output stream

• Get inputstream and read from the stream. Getting exception at this point

  public class DateServer {
  public static void main(String[] args) throws InterruptedException {
  ServerSocket serverSocket = null;
  Socket client = null;
  try {
      serverSocket = new ServerSocket(6013);
      while (true) {
          client = serverSocket.accept();
          OutputStream outputStream = client.getOutputStream();
          InputStream inputStream = client.getInputStream();
  
          System.out.println("" + outputStream + "-" + inputStream);
  
          BufferedReader bufferedReader = new BufferedReader(
                  new InputStreamReader(inputStream));
  
          String line = null;
          while ((line = bufferedReader.readLine()) != null) {
              System.out
                      .println("Message recieved from client ::" + line);
          }
  
          PrintWriter printWriter = new PrintWriter(outputStream, true);
  
          printWriter.println(new java.util.Date().toString());
  
          client.close();
      }
  } catch (IOException exception) {
      exception.printStackTrace();
      System.err.println(exception);
  }
      }
  
      }
  

• 打开连接
• 获取输出流，写入流并关闭输出流

• 获取输入流并从流中读取。此时出现异常

  public class DateServer {
  public static void main(String[] args) throws InterruptedException {
  ServerSocket serverSocket = null;
  Socket client = null;
  try {
      serverSocket = new ServerSocket(6013);
      while (true) {
          client = serverSocket.accept();
          OutputStream outputStream = client.getOutputStream();
          InputStream inputStream = client.getInputStream();
  
          System.out.println("" + outputStream + "-" + inputStream);
  
          BufferedReader bufferedReader = new BufferedReader(
                  new InputStreamReader(inputStream));
  
          String line = null;
          while ((line = bufferedReader.readLine()) != null) {
              System.out
                      .println("Message recieved from client ::" + line);
          }
  
          PrintWriter printWriter = new PrintWriter(outputStream, true);
  
          printWriter.println(new java.util.Date().toString());
  
          client.close();
      }
  } catch (IOException exception) {
      exception.printStackTrace();
      System.err.println(exception);
  }
      }
  
      }
  

Client :

客户 ：

    public class DateClient {

public static void main(String[] args) throws UnknownHostException,
        IOException, InterruptedException {
    Socket sock = new Socket("127.0.0.1", 6013);
    OutputStream outputStream = sock.getOutputStream();
    InputStream inputStream = sock.getInputStream();

    System.out.println("" + outputStream + "-" + inputStream);

    PrintWriter printWriter = new PrintWriter(outputStream, true);
    printWriter.println("Hi Server");

    outputStream.close();

    System.out.println(sock.isConnected());

    BufferedReader bufferedReader = new BufferedReader(
            new InputStreamReader(inputStream));
    String line;
    while ((line = bufferedReader.readLine()) != null) { // Exception 
        System.out.println(line);
    }

}

}

Getting below socket closed exception in Client . Could you please let me know what would be the reason.

在 Client 中低于套接字关闭异常。你能告诉我是什么原因吗？

  Exception in thread "main" java.net.SocketException: Socket closed
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:146)
at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:282)
at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:324)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:176)
at java.io.InputStreamReader.read(InputStreamReader.java:184)
at java.io.BufferedReader.fill(BufferedReader.java:153)
at java.io.BufferedReader.readLine(BufferedReader.java:316)
at java.io.BufferedReader.readLine(BufferedReader.java:379)
at edu.iub.cs.httpserver.DateClient.main(DateClient.java:32)

回答by Todd Jefferson

java.net.SocketException socket is closed This exception means that you closed the socket, and then continued to try to use it.

java.net.SocketException socket is closed 这个异常意味着你关闭了socket，然后继续尝试使用它。

os.close();

And you closed it here. Closing either the input or the output stream of a Socket closes the other stream and the Socket.

你在这里关闭了它。关闭 Socket 的输入或输出流将关闭另一个流和 Socket。

回答by user3003435

java.net.SocketExceptionarises only when u close the OutputStream(or) Socket before reading from the server.

java.net.SocketException仅当您OutputStream在从服务器读取之前关闭（或）套接字时才会出现。

From your code, remove:

从您的代码中删除：

OutputStream.close(); 

and then try..

然后尝试..