java - Object Input Stream only getting one file over network? -

i have created basic client server send image files in specified directory on network. code worked last week came today , seems getting 1 file on server side, though client prints out has sent image files in directory. may in client code think on server side. appreciated , if have more efficient solution, happy change code necessary. code below:

imageserver

        package com.encima.network.server;          import java.io.*;         import java.net.*;          public class imageserver{       serversocket ss;      socket s;      objectoutputstream oos;      int port = 4440;       public imageserver() throws ioexception {       try {        ss  = new serversocket(port);        system.out.println("server started on port: " + port);       } catch(ioexception e) {        system.out.println("serevr: port-" + port  + " not available, exiting.");        system.exit(0);       }        system.out.println("server: waiting client connection...");        while(true) {        try {         s = ss.accept();         new imagehandler(s);        } catch (ioexception e) {         e.printstacktrace();        }       }      }       public static void main(string[] args) throws ioexception {       imageserver = new imageserver();      }          }  imagehandler      package com.encima.network.server;      import java.awt.image.bufferedimage;     import java.io.fileoutputstream;     import java.io.objectinputstream;     import java.net.socket;      import javax.imageio.imageio;      public class imagehandler implements runnable {       socket s;      int count = 0;       public imagehandler(socket socket) {       s = socket;       thread t = new thread(this);       t.start();      }       @override      public void run() {        try {        objectinputstream ois = new objectinputstream(s.getinputstream());        fileoutputstream fos = new fileoutputstream("image" + system.nanotime() + ".jpg");        count++;        //bufferedimage in = imageio.read(ois);        //imageio.write(in, "jpg", fos);         int ch = 0;         while(true) {          ch = ois.read();           if(ch == -1) {            break;           }          fos.write(ch);         }           fos.flush();       } catch (exception e) {        e.printstacktrace();       }      }     }    finally, imageclient      package com.encima.network.client;      import java.awt.image.bufferedimage;     import java.io.file;     import java.io.fileinputstream;     import java.io.ioexception;     import java.io.objectoutputstream;     import java.net.socket;      import javax.imageio.imageio;      import com.encima.network.imagefilter;       public class imageclient {       socket s;      string ip = "localhost";      int port = 4440;      objectoutputstream oos;       public imageclient(file[] files) throws ioexception, classnotfoundexception, interruptedexception {        try {        s = new socket(ip, port);        system.out.println("client connected server via " + ip + " on port 80");       } catch (exception e) {        system.out.println("client: cannot find host: " + ip + ". exiting.");        system.exit(0);       }        oos = new objectoutputstream(s.getoutputstream());        for(file f: files) {        sendfile(f);       }       oos.close();        //system.out.println("written image " + + " of " + files.length);      }       public static void main(string[] args) throws ioexception, classnotfoundexception, interruptedexception {       file dir = new file("/users/christophergwilliams/dropbox/phd/projects/phd/year 1/gsn/images");       file[] files = dir.listfiles(new imagefilter());       imageclient ic = new imageclient(files);      }       public void sendfile(file file) throws ioexception {       fileinputstream fis = new fileinputstream(file);       //bufferedimage b = imageio.read(file);       //imageio.write(b, "jpg", oos);       int ch = 0;        while(true) {         ch = fis.read();         if(ch == -1) {          break;         }         oos.write(ch);        }       oos.flush();       system.out.println("image sent");       }   } 

i aware lot of code read through appreciate can on this!

i may wrong but, sake of efficiency , network traffic, beneficial send images zip client server?

why using objectinputstream @ all? you're not reading or writing serialized objects - raw binary data. use whatever inputstream provided, , read that.

anyway, that's not big problem. big problem you're writing several files 1 stream, no indication of 1 file meant finish , next 1 meant start. how expecting split multiple files up? options:

• use delimiter between files (very ugly - you'd have potentially escape data looked delimiter went along)
• prefix each file length
• send each file on different connection

(you're reading , writing single byte @ time. use overloads of read/write accept byte arrays.)