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[英]Exception in “helloworld” server and client program in socket programming
[英]In Client server socket program, getting socket exception when input stream is not read by clientsocket
在下面的客戶端服務器套接字程序中,客戶端正在將數據發送到正在偵聽端口3500的服務器,但是這里服務器沒有將任何數據發送回客戶端,因此在客戶端套接字程序中,我不會從輸入中讀取流然后獲取套接字異常,套接字寫入錯誤。 下面是服務器代碼:
private static ServerSocket sc = null;
private static final int port = 3500;
public static void main(String args[]) throws IOException{
try {
sc = new ServerSocket(port);
while(true){
Socket socket = sc.accept();
System.out.println("Listening on port <=> "+port);
ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());
String message = (String) ois.readObject();
System.out.println("Received Request <=>"+message);
ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream());
oos.writeObject("Hi Client received your message<=>"+message);
ois.close();
oos.close();
socket.close();
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
客戶端套接字代碼如下:
try {
ObjectOutputStream oos = null;
ObjectInputStream ois = null;
Socket clientsocket = null;
for(int i=0;i<2;i++){
clientsocket = new Socket(InetAddress.getLocalHost().getHostName(), 3500);
oos = new ObjectOutputStream(clientsocket.getOutputStream());
oos.writeObject("Client Request: "+i);
//ois = new ObjectInputStream(clientsocket.getInputStream());
//String message = (String) ois.readObject();
//System.out.println("Message sent by Server: " + message);
//ois.close();
oos.close();
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
在上面的代碼中,如果刪除了注釋,則代碼工作正常,但困惑為什么在沒有要讀取的數據時應該讀取輸入流。
如上所述,在注釋輸入流部分后進入異常。
Listening on port <=> 3500
Received Request <=>Client Request: 0
java.net.SocketException: Software caused connection abort: socket write error
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(Unknown Source)
at java.net.SocketOutputStream.write(Unknown Source)
at java.io.ObjectOutputStream$BlockDataOutputStream.drain(Unknown Source)
at java.io.ObjectOutputStream$BlockDataOutputStream.setBlockDataMode(Unknown Source)
at java.io.ObjectOutputStream.writeNonProxyDesc(Unknown Source)
at java.io.ObjectOutputStream.writeClassDesc(Unknown Source)
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.writeFatalException(Unknown Source)
at java.io.ObjectOutputStream.writeObject(Unknown Source)
at com.springexercise.demo.ServerTest.main(ServerTest.java:28)
該錯誤是因為您在服務器有機會將數據寫入流之前關閉了客戶端的連接。
如果刪除
ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream());
oos.writeObject("Hi Client received your message<=>"+message);
....
oos.close();
部分錯誤應得到解決,因為服務器不再嘗試在關閉的連接上進行寫操作。
如果您在代碼中讓客戶端讀取部分,則整個過程將正常進行,因為客戶端會在連接中等待新數據。 這導致當服務器嘗試寫入時連接仍處於打開狀態,並且一切都按預期從Java站點正常工作。
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