Uploading text files and small problems with TCP in Java network programming

I just learned the Java network programming in the TCP transmission, to use TCP to transfer files, I also encountered some problems, take the time to tidy up a bit for their own reference later use.

First in this program, I use a client, a server, upload a text file from the client to the server, the server to receive data and display "upload success" to the client.

Client:

1 ImportJava.io.BufferedReader;2 ImportJava.io.FileReader;3 Importjava.io.IOException;4 ImportJava.io.InputStreamReader;5 ImportJava.io.PrintWriter;6 ImportJava.net.Socket;7 8  Public classuploadclient {9 Ten     /** One      * @paramargs A      * @throwsIOException -      */ -      Public Static voidMain (string[] args)throwsIOException { the         //1. Create the client socket object -Socket s=NewSocket ("192.168.1.127", 10000); -          -         //2. Put the file in the buffer and upload +BufferedReader bufr= -                 NewBufferedReader (NewFileReader ("Client.txt")); +          A         //by using PrintWriter to process the byte stream and the character stream, take over the stream atPrintWriter out =NewPrintWriter (S.getoutputstream (),true); -          -         //start reading, upload to service side -String line=NULL; -          while((Line=bufr.readline ())! =NULL){ - out.println (line); in         } -          to         //Here you have to give a sign for the end, or the server will always wait +Out.println ("Over"); -          the         //3. Read the object returned by the server *BufferedReader Bufrin =NewBufferedReader (NewInputStreamReader (S.getinputstream ())); $String str=bufrin.readline ();Panax Notoginseng System.out.println (str); -          the         //4. Close the current + bufr.close (); A s.close (); the     } +  -}

Service side:

ImportJava.io.BufferedReader;ImportJava.io.BufferedWriter;ImportJava.io.FileWriter;Importjava.io.IOException;ImportJava.io.InputStreamReader;ImportJava.io.PrintWriter;ImportJava.net.ServerSocket;ImportJava.net.Socket; Public classUploadserver {/**     * @paramargs *@throwsIOException*/     Public Static voidMain (string[] args)throwsIOException {//1. Set up the socket object on the server sideServerSocket ss=NewServerSocket (10000); //2. Receiving data from the serverSocket s=ss.accept (); //put the accepted data into the streamBufferedReader bufin=NewBufferedReader (NewInputStreamReader (S.getinputstream ())); //specifies the file to be written toBufferedWriter bufw=NewBufferedWriter (NewFileWriter ("Server.txt")); //start reading//The default size of the buffer is 8k, one to 8k will automatically refresh, if there is no end flag, the resulting file size must be a multiple of 8String line=NULL;  while((Line=bufin.readline ())! =NULL){            if("Over". Equals (line)) Break;            Bufw.write (line);            Bufw.newline (); //Write your own refreshBufw.flush (); }                //returns data to the client, using PrintWriterPrintWriter out =NewPrintWriter (S.getoutputstream (),true); Out.println ("Upload succeeded"); //off-StreamBufw.close (); //disconnecting from client off serverS.close ();    Ss.close (); }}

Uploading text files and small problems with TCP in Java network programming