sockets - Java Echo Server Not Working -

server code:

import java.net.*; import java.io.*; import java.util.*; class ecserver{     public static void main(string args[])throws exception{         serversocket ss=new serversocket(4019);         socket so=ss.accept();         printstream pw=new printstream(so.getoutputstream());         string str;         bufferedreader br=new bufferedreader(new inputstreamreader(so.getinputstream()));         while(true)         {             str=br.readline();             system.out.println("client input : "+str);             pw.println(str);             if(str.equals("."))                 break;           }     } } 

client code:

import java.net.*; import java.io.*;  class ecclient{     public static void main(string args[])throws exception{         socket so=new socket("localhost",4019);         printstream ps=new printstream(so.getoutputstream());         bufferedreader br=new bufferedreader(new inputstreamreader(system.in));         bufferedreader br1=new bufferedreader(new inputstreamreader(so.getinputstream()));         string str;         str=br.readline();         while(!str.equals("."))         {             ps.println(str);             str=br1.readline();             system.out.println(str);             str=br.readline();         }     } } 

the above code has 2 parts : client , server . m quite new java socket programming .

the server has server socket , socket type . message sent server client via 4019 port . server prints same message output , copy sent client server.

the clients job take line , send server return copy of message , print output.

the program terminates when "." encountered.

the problem when type message , send , both client , serve hang.

you not flushing output stream , reason server , clients hanging. either use ps.flush(); after writing socket or use auto flushing by:

printstream pw=new printstream(so.getoutputstream(), true); 

and

printstream ps=new printstream(so.getoutputstream(), true); 

on both ends. hope helps