Sending multiple files using one socket

Question

Hi guys
I'm working on a simple app that sends multiple files over LAN or I-NET. The problem is that the app run seems to be non-deterministic. I keep getting this error on the client side:
java.io.UTFDataFormatException: malformed input around byte 5
        at java.io.DataInputStream.readUTF(Unknown Source)
        at java.io.DataInputStream.readUTF(Unknown Source)
        at service.DownloadManager.storeRawStream(DownloadManager.java:116)
        at service.DownloadManager.downloadFiles(DownloadManager.java:47)
        at manager.NetworkTransferClient$1.run(NetworkTransferClient.java:104)The byte position changes every time I run a transfer. The error is caused by this line: String fileName = in.readUTF(); Here's the complete code:
Client
private void storeRawStream() {                               
        try {
            FileOutputStream fileOut;                       
            int fileCount = in.readInt();           
            for(int i=0; i<fileCount; i++) { 
                byte data[] = new byte[BUFFER];
                String fileName = in.readUTF();               
                fileOut = new FileOutputStream(new File(upload, fileName)); 
                long fileLength = in.readLong();                                 
                for(int j=0; j<fileLength / BUFFER; j++) {
                    int totalCount = 0;
                    while(totalCount < BUFFER) {                       
                        int count = in.read(data, totalCount, BUFFER - totalCount);
                        totalCount += count;                 
                    fileOut.write(data, 0, totalCount);
                    fileOut.flush();
                    bytesRecieved += totalCount;                                  
                // read the remaining bytes               
                int count = in.read(data, 0, (int) (fileLength % BUFFER));                                        
                fileOut.write(data, 0, count);              
                fileOut.flush();
                fileOut.close();      
                transferLog.append("File " + fileName + " recieved successfully.\n");  
        } catch (Exception ex) {
            ex.printStackTrace();
    }Server
public void sendFiles(File[] files) throws Exception {
        byte data[] = new byte[BUFFER];
        FileInputStream fileInput;                                       
        out.writeInt(files.length);              
        for (int i=0; i<files.length; i++) {   
            // send the file name
            out.writeUTF(files.getName());
// send the file length
out.writeLong(files[i].length());
fileInput = new FileInputStream(files[i]);
int count;
while((count = fileInput.read(data, 0, BUFFER)) != -1) {
out.write(data, 0, count);
bytesSent += count;
fileInput.close();
out.flush();
Does anybody know where's the problem? Thanx for any reply.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

Answer 1

Send the length of each file ahead of each file, with DataOutputStream.writeLong().
When reading, read that long, then stop reading bytes when you've read exactly that length.