java - send file then message through socket -

i trying send file client server. server receives file , send confirmation message client.

my problem client becomes unresponsive when waiting confirmation.

server :

import java.net.*; import java.io.*;  public class server { public static void main(string args[]) throws ioexception {         int port = 1234;     serversocket server_socket;      server_socket = new serversocket(port);     system.out.println("server waiting client on port "             + server_socket.getlocalport());     // server infinite loop     while (true) {         socket socket = server_socket.accept();         system.out.println("new connection accepted "                 + socket.getinetaddress() + ":" + socket.getport());     try {                 byte[] b = new byte[1024];                 int len = 0;                 int bytcount = 1024;                 string filename = "c:\\test\\java\\tmp\\sentfile.pdf";                  fileoutputstream infile = new fileoutputstream(filename);                 inputstream = socket.getinputstream();                 bufferedinputstream in2 = new bufferedinputstream(is, 1024);                 while ((len = in2.read(b, 0, 1024)) != -1) {                     bytcount = bytcount + 1024;                 infile.write(b, 0, len);                 }                 system.out.println("bytes writen : " + bytcount);                  //sending response client.                 objectoutputstream oos = new objectoutputstream(socket.getoutputstream());                 oos.flush();                 oos.writeobject("ok");                 system.out.println("message sent client "+"ok");                  in2.close();                 infile.close();             } catch (ioexception e) {         system.out.println("unable open file" + e);         return;     }     socket.close();     system.out.println("connection closed client");         } } } 

client :

import java.net.*; import java.io.*;  public class client {     public static void main(string[] args) throws unknownhostexception,         ioexception, classnotfoundexception {          int port = 1234;     socket socket = null;      // connect server     socket = new socket("127.0.0.1", port);      try {             byte[] buf = new byte[1024];             outputstream os = socket.getoutputstream();             bufferedoutputstream out = new bufferedoutputstream(os, 1024);             string file = "c:\\test\\java\\client\\source.pdf";              fileinputstream in = new fileinputstream(file);             int = 0;             int bytecount = 1024;             while ((i = in.read(buf, 0, 1024)) != -1) {                 bytecount = bytecount + 1024;             out.write(buf, 0, i);             out.flush();             }             system.out.println("bytes sent :" + bytecount);              objectinputstream ois = new objectinputstream(socket.getinputstream());             string confirmation = (string) ois.readobject();             system.out.println("from server : " + confirmation);              out.close();             in.close();     } catch (ioexception e) {     system.out.println(e);     }     socket.close(); } } 

here complete working example. server:

package so6540787;  import java.io.bufferedinputstream; import java.io.file; import java.io.fileoutputstream; import java.io.ioexception; import java.io.inputstream; import java.io.objectoutputstream; import java.net.serversocket; import java.net.socket;  public class server {    private final socket socket;    public server(socket socket) {     this.socket = socket;   }    public void receivefile(file file) throws ioexception {     byte[] b = new byte[1024];     int len = 0;     int bytcount = 1024;     fileoutputstream infile = new fileoutputstream(file);     inputstream = socket.getinputstream();     bufferedinputstream in2 = new bufferedinputstream(is, 1024);     while ((len = in2.read(b, 0, 1024)) != -1) {       bytcount = bytcount + 1024;       infile.write(b, 0, len);     }     system.out.println("bytes writen : " + bytcount);      // sending response client.     objectoutputstream oos = new objectoutputstream(socket.getoutputstream());     oos.flush();     oos.writeobject("ok");     system.out.println("message sent client " + "ok");      in2.close();     infile.close();   }    public static void main(string[] args) throws ioexception {     serversocket listen = new serversocket(10000, 1);     socket socket = listen.accept();     server server = new server(socket);     server.receivefile(new file("c:/received.pdf"));   } } 

and client:

package so6540787;  import java.io.bufferedoutputstream; import java.io.file; import java.io.fileinputstream; import java.io.ioexception; import java.io.objectinputstream; import java.io.outputstream; import java.net.socket;  public class client {    private final socket socket;    public client(socket socket) {     this.socket = socket;   }    public void sendfile(file file) throws ioexception, classnotfoundexception {     byte[] buf = new byte[1024];     outputstream os = socket.getoutputstream();     bufferedoutputstream out = new bufferedoutputstream(os, 1024);     fileinputstream in = new fileinputstream(file);     int = 0;     int bytecount = 1024;     while ((i = in.read(buf, 0, 1024)) != -1) {       bytecount = bytecount + 1024;       out.write(buf, 0, i);       out.flush();     }     socket.shutdownoutput(); /* important */     system.out.println("bytes sent :" + bytecount);      objectinputstream ois = new objectinputstream(socket.getinputstream());     ois.skip(long.max_value);     string confirmation = (string) ois.readobject();     system.out.println("from server : " + confirmation);      out.close();     in.close();   }    public static void main(string[] args) throws ioexception, classnotfoundexception {     client client = new client(new socket("localhost", 10000));     client.sendfile(new file("c:/tobesent.pdf"));   } } 

the line missing "socket.shutdownoutput()". if leave line out, server never see end-of-file marker -1 read call.

please fix way count bytes have been sent. should start 0 instead of 1024 , increment counter many bytes have read.