How To Send Binary Data From File Through WebSocket

Aug 12, 2014

I am not able to send large binary data from Java WebSocket client to Java WebSocket server. However, 1KB data transfer is working. Below is my code:

Client:

RandomAccessFile aFile = new RandomAccessFile
("c: est.txt", "r");
FileChannel inChannel = aFile.getChannel();
ByteBuffer buffer = ByteBuffer.allocate(1024);
while(inChannel.read(buffer) > 0)
{
session.getBasicRemote().sendBinary(buffer, false);

[code]...

Give me an example of WebSocket sample for large binary data transfer.

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Apr 9, 2015

I would like to understand how does multipart/form-data works during file upload scenario's, Does it chunks the data from client to server while transferring the files ?

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Unable To Create Serversocket That Send Binary In Parts

Mar 9, 2015

I am trying to create a serversocket that send a binary in parts ie send 1024 bytes then wait for acknowledgement from the client before sending the next 1024. I am able to do it in udp but the client is tcp. This is my code so far

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
public class TestFtp {

[Code]....

I have not been able to send then receive acknowledgement before sending the next 1024 bytes.

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Aug 11, 2014

I'm new to json and the web. My purpose is to use json data from a server and parse it and show meaningful data to the user. I am aware of json parsing, so no sweat there. However, I would like to know how json data is sent to the front end after which it can be parsed.

Usually in my json parsing examples, I have a variable like var data = ]OR I do a getJSON on a data.json file which I have stored in the project folder. However, I want this data to come real time from a servlet. How to go about this?

So, basically my question is, how do I send real time json data from a servlet backend, say some records which I have extracted from the database using jdbc?

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Servlets :: Send Data Over Network Using Httpsession?

Jan 9, 2015

I am learning few concepts in servlets. And i came across this doubt. We used to send data over network using httpsession as below.

HttpSession session = request.getSession();
Object obj = new Object();
session.setAttribute("object", obj);

And get the data in JSP with below code

<%= session.getAttribute("object")%>

However I am not sure whether HTTPSession is serializable or not.

How HTTPSession works?

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DatagramChannel - UDP Receiving OK / Unable To Send Data

Apr 29, 2014

I am trying to connect to a local service over UDP - the simulator works fine, but my code does not... The sender is a separate thread and I have tried blocking, non-blocking, connecting, not connection, reading and re-reading the Oracle docs,

Java Code:

package my.comm;

import my.myMethods;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.DatagramChannel;
import java.util.LinkedList;
import java.util.Queue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

[code]....

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Mar 2, 2014

I'm using netbeans to develop an application to send and receive data via RS 232 standard. I can send data but I can't read it.what can I do? I have this message in the console: Underlying input stream returned zero bytes. (I must use also threads to have application in real time but I don't understand very well....

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Java Servlet :: Unable To Send Data From JSP To Oracle Database

Jan 31, 2013

I'm creating a web applicaion. for that i want to create a registration page. and this registration details have to be stored in the database.

I'm getting the below error while trying to send the data ...

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Here cmd is project name and InsertRegtodb is servlet name.

Actually the servlet is present is the mentioned address. but it is not connecting to it

There is one more servlet in the same folder and which is accessible from another jsp. But this servlet is not accessible even though i have used same code as it is used for the servlet which worked for me previously...

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Websocket Integration With JSP And Servlets

Mar 10, 2014

I am familiar with Servlet/jsp's and developed a web application using them. Now I am looking in Websocket of Java 7. Documentation is not clear how to integrate the two.
 
1. Let us say in my listener, I have already determined database connections, log file for log4j  etc.. Can I use it in Websocket Java classes based on annotation API of web socket. What is not clear to me how I  will access Context parameters for webapp saved in Listener.

2. I like jsp so I can dynamically modify the html to be shown. If I am using api, how will I do that, I know I can return data from websocket, but all the java logic which jsp provides, how can that be implemented using web socket api.

Show trimmed content 

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May 23, 2014

I want to make a parser from binary to ASCII with JavaCC or another Compiler Construction with Java. I don't know how to start.

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Jun 18, 2015

When a JavaScript client attempts to open a socket, instead of the connection opening it immediately closes. The client is using:
 
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The same thing happens for com.sun.net.httpserver.HttpsServer where client is using:
 
webSocket = new WebSocket("wss://localhost/example");
 
How can I enable websocket support?
 
If it's not possible, how can I request for it to be added as a new feature?

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Replacing Binary Data - Renew Expiry Date

Aug 3, 2014

Below is a method that i want to try to renew the expiry date.

Well I'm trying to read the file and rewrite the data into the txt file, is that possible?

Java Code:
public static void renew()throws IOException{
Scanner s=new Scanner(System.in);
Scanner s2=new Scanner(System.in);
Calendar calendar = new GregorianCalendar();
int year = (calendar.get(Calendar.YEAR));

[Code] ...

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Send Text File Over Socket

Feb 18, 2014

I'm trying to send a text file over a socket, from client to server, but I doesn't work. I will demonstrate a part of the code that isn't working.

The critical part of the server look like this:

while(true) {
try {
Socket socket = fileSocket.accept();
out = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
String s = in.readLine();

And the client like this:

Socket = new Socket(address, number);
BufferedWriter out = new BufferedWriter(new OutputStreamWriter(Socket.getOutputStream()));
BufferedReader in = new BufferedReader(new InputStreamReader(Socket.getInputStream()));
BufferedReader fileIn = new BufferedReader(new FileReader(filename));
String s = fileIn.readLine();
out.write(s);

Now I want the s in the server to hold the same string as s in the client, but the server can't read the stream - nothing happens. I know that readLine() reads until a new line character, but it doesn't word to write and read a single character either.

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How To Send A File Without Closing The Socket

Mar 3, 2014

I wrote a program to transfer a file using tcp connection, where I closed socket since the receiver need to detect the end-of--file.  But now I like to extend it to multiple file for which i should not close the socket until all the files are send. I can't find a way for this. So how to resolve it.

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Rewrite Upload Binary File Into A Normal File

Nov 14, 2014

I upload a file and save it like the following  

byte[] uploadedFileBuf = new byte[(int) uploadedFile.length()];
saveFileSystem(excelUpload + getLocalFileName(acad_year, stuid), uploadedFileBuf);
private boolean saveFileSystem(String filename, byte[] data){
  try{
        FileOutputStream fos = new FileOutputStream(filename);
          fos.write(data);
         fos.close();

[Code]...

I can not read it  use

HSSFWorkbook WorkBook = new HSSFWorkbook(new FileInputStream(filename));

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Peterson Lock Implemented For N Threads Using Binary Tree Data Structure

Feb 8, 2014

import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
public class tree_lock_test{
int total_instances;
int thread_instances = 0;
int N;

[Code] .....

this is compiled with another Peterson class which has implemeted peterson lock for two threads ...

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Unable To Run WebSocket On Hosting Server But Working Well On Local Host

Feb 16, 2015

I am developing one android chatting application. for that on Server side i am using WebSocket as war file.

It is working well on localhost the same tomcat. but when i try to connect on the hosting server, it showing http error..,

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Servlets :: HTML Form - Possible To Send Data (image / Text) Along A Single Form

Jan 8, 2015

I want to understand how is it possible to send data (image + text) along a single form. Here is my code:

<form method="post" action="updateAccount"
encType="multipart/form-data">
<input type="file" name="file" value="Select image ..." /> <input
type="submit" value="Start Upload" /> <br>
<textarea rows="8" cols="54" name="about">Yes

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JSP :: Unable To Send Text File Content To Printer

May 8, 2014

<%@ page import="javax.print.*"%>
<%@ page import="javax.print.attribute.*"%>
<%@ page import="java.io.*"%>
<%out.println("Printing...");
String filename = "c:/20140505_3_40.txt";//this is the text file i want to send to printer
// am using tomcat 8
PrintRequestAttributeSet pras =
new HashPrintRequestAttributeSet();

[Code]...

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Log File Parsing - Find A Value For Variable And Send To Database

Nov 29, 2014

I am new to java coding. so reading the log file using java code.

1) I wish to parse a file, and find a value for variable e.g. [StorageVersion].
2) After finding the value, it will be pushed to database.

Log File Path e.g. C:Temp est.txt"

Sample Logs :
{
//NAME
[1.2.2917] := s['3.4.454545'];

//Parameter
[1.2.2947] := s['1.2.56778'];

//Enabled
[1.2.3910] := B['22.43434.12232'];

//MAXCLOUMNNAME
[1.2.4217] := N['1.7.899982'];

//StorageVersion
[1.2.2917] := K['706146.0.22106932'];
}

From above log file, the Value i need is "706146.0.22106932"

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Send Single File From A Client To Default Directory Of Server

Aug 8, 2014

I'm trying to do a program that send a single file from a client to a default directory of a Server. The program use the datagramSocket and datagramPacket for the transfer via UDP. The client sent the packet of the file correctly and the server start the receiving but every time the Server class crashes after it's receiving 4/5 packet (exactly 8192 byte)

Then i put the code of the 2 class and the 2 output.

OUTPUT CLIENT:

PROGRAM TRANSFER PACKAGES
name of file is : Doc1.pdf
his dimension: 11408 byte

*** start sending
- 1024 byte
- 2048 byte
- 3072 byte
- 4096 byte
- 5120 byte
- 6144 byte
- 7168 byte
- 8192 byte
- 9216 byte
- 10240 byte
- 11264 byte
- 11408 byte
*** FILE SUCCESFULL SENDED***
BUILD SUCCESSFUL (total time: 3 seconds)

OUTPUT SERVER

PROGRAM TRANSFER PACKAGES
START NEW CONNECTION
Directory: C:prova
Server waiting in port: 9876
Waiting Client...
Name of file is : Doc1.pdf
Dimension : 11408

[Code] ....

In this point the program go in loop and didn't anything. I don't understand how can i resolve it...

SERVER

package udp_pacchetti; 
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;

[Code] ...

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Unable To Sum All Integers In Binary File

Dec 4, 2014

iam trying to sum all the integers in a binary file. the integers are 0-9. IAM having trouble exiting the while loop to display the sum. below is what i have so far which is not displaying the sum.

import java.io.*;
public class binaryAdd{
public static void main(String []args)throws IOException{
DataOutputStream output= new DataOutputStream(new FileOutputStream("myBinary.dat"));
for(int i=0;i<10;i++){

[Code]...

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User Input All Of Data On A Single Line And Implement StringTokenizer To Assign That Data To File

Mar 21, 2015

By using FileReader, FileWriter and their constituents, I am creating a file to contain employee information ( name, age, hours, etc. ). The user is to input all of the data on a single line and we were asked to implement StringTokenizer to assign that data to the file. I have never used the StringTokenizer before, but I have a rough idea how it is to function. I used pw.println to test what I have so far, now I would like to let the user build the initial file with the "first employees" of the company, and then view the file, and then go back and append new employee data to that same file. My question is, how can I take the user input as a StringTokenizer and add that to the file?

In the for loop below, I thought I would see if it would work, but it does not. The loop only executes once and does not allow me to enter data.

public class Records {
public static void main(String [] args) throws IOException {
Scanner input = new Scanner(System.in);
FileWriter fw = new FileWriter("dbs3.java");
BufferedWriter bw = new BufferedWriter(fw);
PrintWriter pw = new PrintWriter(bw);
System.out.println("NEW EMPLOYEE DATA SHEET");
System.out.print("Number of new employees: ");
int number = input.nextInt();

[Code] ....

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When Deleting Data From File / Temp File Won't Rename Back To Original File

Apr 23, 2015

I am trying to remove a line based on user input. myFile.txt looks like:

Matt
Brian
John

However when I enter "Brian" (to remove this line), It is deleted on the temp file (myTempFile.txt), but not renamed back to the original file (myFile).

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;
 
[code]....

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I/O / Streams :: How To Read In A Binary File Correctly

Nov 8, 2014

I have a binary file that has identifiers for the start of each record

You can see here that the record starts with 00 00 and the next record starts with 00 00 etc...

How do I read between these two points throughout the file?

RandomAccessFile database = new RandomAccessFile(databasePath, "r");
int start = 0;
int end = 0;
database.setLength(start);
database.seek(end);

The first start would be the start of the file, the next start would be the end of the first start and so on..

I'm just not sure how to put that into a loop.

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Saving And Reading Persons To / From Binary File

Dec 7, 2014

Everything compiles but doesn't work like it should. What the idea is, is to be able to add class personnel objects and have them saved in a file, so that later on i would be able to see them.

Back to my problem: When i create a new "Personnel" and try to run Write and read, to see if my new "Personnel" is added to the list, it's not there at all... what do i do wrong?

import java.io.*;
class Personnel implements Serializable
//No other action required by Serializable interface.
{
private long payrollNum;
private String surname;
private String firstNames;

[Code] ....

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