Problem while sending a string from client to server in java

Question

I have sent a String from client to server but when it receives to the server it doesn't print in the first time only in second time and don't know why.
Here is the code :
Client Side:

String str = "40D32DBBE665";  
while (str != null)   {  
    out.writeUTF(str);  
    }

Server Side:

String st="";  
while(in.readUTF()!=null){ // it gets into the loop in the first time 
            System.out.println("Test"); // in the first time it prints this line 
            st = in.readUTF();  
            System.out.println(st);  
          }

So how I can receive it in the first time. Please help !!!
Thanks in advance :)

It's really unclear exactly what you mean by "in the first time" etc. A pair of short but complete programs (one server, one client) would really help. Please read tinyurl.com/so-hints — Jon Skeet
– Jon Skeet, Commented Jun 27, 2011 at 14:58
@Jon Skee because the string will be sent multiple times and received multiple times since it is in a loop in the server/client sides. — Mohannad.Z
– Mohannad.Z, Commented Jun 27, 2011 at 15:11
In the first piece of code, nothing's ever changing str - do it doesn't make sense to be in a loop checking the contents of str... as I say, a short but complete pair of programs would really help. — Jon Skeet
– Jon Skeet, Commented Jun 27, 2011 at 15:14

Prince John Wesley · Accepted Answer · 2011-06-27 14:57:50Z

3

while(in.readUTF()!=null){ // it gets into the loop in the first time 
            System.out.println("Test"); // in the first time it prints this line 
            st = in.readUTF();

should be

while((st=in.readUTF())!=null){ // don't miss odd messages
     System.out.println(st);
}

answered Jun 27, 2011 at 14:57

Prince John Wesley

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1 Comment

Brett Kail Over a year ago

If the answer solved your problem, you should click the checkmark to the left of the answer to accept it.

Vincent Ramdhanie · Accepted Answer · 2011-06-27 14:59:07Z

2

You are effectively reading twice before printing on the server. Try this:

  while((st = in.readUTF())!=null){ // it gets into the loop in the first time               
        System.out.println(st);  
      }

answered Jun 27, 2011 at 14:59

Vincent Ramdhanie

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