侦听服务器发送尝试的正确方法

Question

what is the proper way to determine that the server is sending data at the moment for example
Pseudo-code

while(true){
  //Do something
  if(ServerIsSendingrightnow){
    //Get The Data
    //Calling some method to handling the server's data
  }
  //Do something else
}

does the method available() of InputStream class do the job ?
Code:

 while(true){
   //Do something
   InputStream IStreamsock = Socket1.getInputStream();
   if(IStreamsock.available()){ //the server is sending data right now !
     //Get The Data
     //Calling some method to handling the server's data}
     //Do something else
}

In C# we have MemoryStream class that serve as Dynamic byte array
is there any java equivalent for MemoryStream
can I do something like this in java: Pseudo-code

 while(DataIsAvailableInSocketInputStreamBuffer){
   MemoryStreamEquivalent.WriteByte(IStreamsock.ReadByte())}

I'm Sorry, but I'm new comer in java

Answer 1

Nope, the usage of available is not very useful, because it does not work as you would expect it. Just use in.read(). It will wait until something is sended by the server. So if you use it in a thread, it just waits until something can be recieved.

Edit: It recieves just one Byte, so eg a BufferedReader (to read Strings) is a better solution, or maybe an ObjectInputReader (for Objects, obviously). And of course the while(true) is needed :)

Answer 2

Example:

Socket s = new Socket(...); // connect to server
BufferedReader br = new BufferedReader(s.getInputStream()); // creating a bufferedReader around the inputstream. If you're dealing with binary data, you shouldn't create a (Buffered)Reader
while (String line = br.readLine()) {
  //do something here
}

Answer 3

So here is an answer how you could do this: (I wrote a complete example run() method of the client thread

@Override
public void run() {
   while(client.isConnected()) {  //client.isConnected should be a method of your client class
      Object inputData = in.read(); //you should use a proper Object type here, if you
                                    //use InputStreamReader, it would be Byte and if you
                                    //use BufferedReader it would be String
      doCrazyStuff(inputData);      //just an example of manipulating data, do your own stuff here
   }
}

Here an example with BufferedReader (I will not change the encoding or something, because I think this is just a training application)

public void run() {
   while(client.isConnected()) {  //client.isConnected should be a method of your client class
      while(!in.ready()) { }        //here you CAN use the method ready, that is boolean

      String inputData = in.readLine();
      doCrazyStuff(inputData);      //just an example of manipulating data, do your own stuff here
   }
}