java - BufferedReader readLine detect closed socket and use .ready() -

server snippet:

reader = new bufferedreader(new inputstreamreader(new bufferedinputstream(connection.getinputstream()))); if (reader.ready()) {     result = reader.readline();     if (result == null) {          quit(); // handle closing socket     } else {          // process result     } } 

client snippet:

bufferedoutputstream os = new bufferedoutputstream(connection.getoutputstream()); outputstreamwriter osw = new outputstreamwriter(os, "us-ascii"); osw.write("hello\n"); osw.flush(); 

the problem:

when client writes server gets read correctly when client closes it's socket (for example force quitting program), reader.readline() should output null, because of if (reader.ready()) { null result never reach quit(). if leave away if (reader.ready()) {, server can't read data.

how fix this?

edit: can't use while ((result = reader.readline()) != null) { because need run more code after this:

while (running) {   try {     reader = new bufferedreader(new inputstreamreader(new bufferedinputstream(connection.getinputstream())));     if (reader.ready()) {       result = reader.readline();       if (result == null) quit();       else // process result     }     catch (exception e) { ... }      // more code   } } 

just remove ready() test. simple that. ready() not test end of stream. readline() block while there no data.

and must create bufferedreader once, outside read loop. otherwise lose data.