Display jpeg byte array with JSP !!

I am new in JSP area so maybe I ask a easy question !!
First, on the server side:I use a C++ program to stream sequence jpeg data out(FF D8 ~ FF D9).
Second, on the client side:I use jsp to open a socket and read
data to a byte array.
Can anyone tell me how to display the jpeg array on browser one by one ?

um... like video frames, or just a single image? I wouldn't really use JSP for that, I'd use a servlet, set the content-type to image/jpeg and just write out the bytes. Unless you are talking about displaying the bytes themselves, in which case, a JSP page would be better. If it's video frames, I'm not sure how to have the browser do that, since most no longer support server push.

Similar Messages

How to load and display a byte array (jpeg) image file dynamically in Flex?

My web service client (servlet) received a binary jpeg data from an Image Server. The Flex application invokes the
servlet via HttpService and receives the binary jpeg data as byte array. How could it be displayed dynamically
without writing the byte array to a jpeg file? Please help (some sample code is very much appreciated).

JPEGEncoder is only useful for converting BitmapData to ByteArray, not the other way around.
By the way JPEGEncoder and PNGEncoder are part of the Flex SDK now, so no need to use AS3Lib (alltough it's a good library to have around).
To display/use a ByteArray as image, use a Loader instance with the loadBytes method.
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Listen for the complete event on the Loader.contentLoaderInfo and get the BitmapData in the event handler.
private function loadJpeg():void {
    var loader:Loader = new Loader();
    loader.contentLoaderInfo.addEventListener(Event.COMPLETE, loaderCompleteHandler);
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    loader.loadBytes(jpgBA);
private function loaderCompleteHandler(evt:Event):void {
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Change quality of JPEG byte array

I have a JPEG file which I read into a byte array in my program, the problem is that I need to change the quality of this image, is it possible? If so, how?

i think these two links could help you:
[JAI cookbook|http://www.lac.inpe.br/~rafael.santos/JIPCookbook/6040-howto-compressimages.jsp]
[java.sun.com|http://java.sun.com/products/java-media/jai/forDevelopers/jai1_0_1guide-unc/Encode.doc.html#51423]

Strange issue with POF: byte array with the value 94

This is a somewhat strange issue we’ve managed to reduce to this test case. We’ve also seen similar issues with chars and shorts as well. It’s only a problem if the byte value inside the byte array is equal to 94! A value of 93, 95, etc, seems to be ok.
Given the below class, the byte values both in the array and the single byte value are wrong when deserializing. The value inside the byte array isn’t what we put in (get [75] instead of [94]) and the single byte value is null (not 114).
Pof object code:
package com.test;
import java.io.IOException;
import java.util.Arrays;
import com.tangosol.io.pof.PofReader;
import com.tangosol.io.pof.PofWriter;
import com.tangosol.io.pof.PortableObject;
public class PofObject1 implements PortableObject {
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     private byte byteValue;
     public void setValues() {
          byteArray = new byte[] {94};
          byteValue = 114;
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     public void readExternal(PofReader reader) throws IOException {
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          System.out.println(Arrays.toString((Object[])byteArray));
          System.out.println(byteValue);
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Using writer.writeObjectArray(0, byteArray); instead of writer.writeObject(0, byteArray); doesn't help. In this case byteArray would be of type Object[] (as accessed through reflection).
This is simply put in to a distributed cache and then fetched back. No EPs, listeners or stuff like that involved:
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          PofObject1 o = new PofObject1();
          o.setValues();
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          cache.get("key1");
Only tried it with Coherecne 3.7.1.3.
Cache config file:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE cache-config SYSTEM "cache-config.dtd">
<cache-config>
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     <caching-schemes>
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                    <init-params>
                         <init-param>
                              <param-type>string</param-type>
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                         </init-param>
                    </init-params>
               </serializer>
               <lease-granularity>thread</lease-granularity>
               <thread-count>10</thread-count>
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          </distributed-scheme>
     </caching-schemes>
</cache-config>
POF config file:
<?xml version="1.0"?>
<pof-config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xmlns="http://xmlns.oracle.com/coherence/coherence-pof-config"
     xsi:schemaLocation="http://xmlns.oracle.com/coherence/coherence-pof-config coherence-pof-config.xsd">
     <user-type-list>
          
          <include>coherence-pof-config.xml</include>
          <user-type>
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</pof-config>

Hi,
POF uses certain byte values as an optimization to represent well known values of certain Object types - e.g. boolean True and False, some very small numbers, null etc... When you do read/write Object instead of using the correct method I suspect POF gets confused over the type and value that the field should be.
There are a number of cases where POF does not know what the type is - Numbers would be one of these, for example if I stored a long of value 10 on deserialization POF would not know if that was an int, long double etc... so you have to use the correct method to get it back. Collections are another - If you serialize a Set all POF knows is that you have serialized some sort of Collection so unless you are specific when deserializing you will get back a List.
JK

How to encrypt byte array with out padding using RSA in Java?

I've modulus and public exponent as byte[] array, so I'm trying to convert into BigIntegers and then create public key and then Cipher. Here is the example code:
With this I'm always getting different encrypted bytes, is it because of padding. I dont want to use any padding so what parameter I need to pass along with RSA? I've modulus byte[] array size 64 bytes. I believe I'll get 64 encrypted bytes. I've content size of 32 bytes to be encrypted.
--------code begin ---------------------------
BigInteger bexponent = new BigInteger(pubExpo);
BigInteger bmodulus = new BigInteger(modulus);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
RSAPublicKeySpec pubKeySpec = new RSAPublicKeySpec(bmodulus, bexponent);
RSAPublicKey pubKey = (RSAPublicKey)keyFactory.generatePublic(pubKeySpec);
Cipher c = Cipher.getInstance("RSA");
c.init(Cipher.ENCRYPT_MODE, pubKey);
return c.doFinal(content);
--------code end---------------------------

With this I'm always getting different encrypted
bytes, is it because of padding. Yes, if you're using PKCS1Padding (which is the default in SunJCE if you don't specify it). Have a look at the PKCS1 spec if you haven't seen it already.
http://www.rsasecurity.com/rsalabs/pkcs
Section 7.2.1 talks about type 2 padding, which uses random bytes as the PS string.
I dont want to use
any padding so what parameter I need to pass along
with RSA? NOPADDING. You should be able to find this out by look at the "Supported Paddings" parameter in your provider's database. Which of course, means you'll need to supply the right number of bytes to the Cipher.

How to display double byte characters with system.out.print?

Hi, I'm a newbie java programmer having trouble to utilize java locale with system io on dos console mode.
Platform is winxp, jvm1.5,
File structure is:
C:\myProg <-root
C:\myProg\test <-package
C:\myProg\test\Run.java
C:\myProg\test\MessageBundle.properties <- default properties
C:\myProg\test\MessageBundle_zh_HK.properties <- localed properties (written in notepad and save as Unicode, window notepad contains BOM)
inside MessageBundle.properties:
test = Hello
inside Message_zh_HK.properties:
test = 喂 //hello in big5 encoding
run.java:
package test;
import java.util.*;
public class Run{
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}//main
}//classwhen run this program, it'll kept diplay "hello" instead of the encoded character...
then when i try run the native2ascii tool against MessageBundle_zh_HK.properties, it starts to display monster characters instead.
Trying to figure out what I did wrong and how to display double byte characters on console.
Thank you.
p.s: while googling, some said dos can only can display ASCII. To demonstrate the dos console is capable of displaying double byte characters, i wrote another helloWorld in chinese using notepad with C# and compile using "csc hello.cs", sure enough, console.write in c# allowed me to display the character I was expecting. Since dos console can print double byte characters, I must be missing something important in this java program.

after google a brunch, I learned that javac (hence java.exe) does not support BOM (byte order mark).
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Even the property file is in ascii format, I'm still having trouble to display those character in dos console. In fact, I just noticed I can use system.out.println to display double byte character if I embedded the character itself in java source file:
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Assigning javascript array with jsp array

hi,
I have a jsp page where I have a array in jsp. I want to assign the values to an javascipt array. how can I do that?
the reason why I want to do this is for a perticular problem I am facing in javascript. that is....
I have a text box in my jsp page, I want the value entered in that box to be checked (whether it exists ) against a hidden string which has some value. I want that hidden string not to be shown to the user even on seeing the html source. that is why I want these values to be stored and checked against a array object of javascript.
any suggestion is appreciated
Thanks
Ashutosh

Hai asutoshdash
if you dont mind of viewing code u can use this else dont use, its not matters weatehr user will see you code or not if the user is professiona then its a big issue normal users not think of is for this dont send valuable infos like password etc to client u may send usernames
ok to create a java array to javascript array do this (i took example of db to array ) write this inside <script> <%codes here%> </script>
var aUsername =new array();
<%
int i=0;
while (rs.next())
%>
aUsername[<%= ++i%>] = "<%= rs.getString("User_Name")%>";
<%
%>thats it use this array where ever you want in your client side(javascript ) usage
hope this will help you
archi

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HI,
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Out put in file looks like this
<?xml version="1.0" encoding="UTF-8"?>
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<TH>Currency</TH>
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<TD class="odd">USA</TD>
<TD class="odd">USD</TD>
</tr>
<tr>
<tr>
<TD class="odd">Ricky</TD>
<TD class="odd">Ponting</TD>
<TD class="odd">IL</TD>
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</tr>
</table>
Jsp Code
String rptHTML = (String)session.getAttribute("ReportStrHTML");
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In Excel, Tools > Macro > security > medicum and Trusted tab check To access VB.

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Regards,
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I have a binary file to be read.I want to read the whole file into a byte array. But while doing so the values which are greater than 128 are read as negative values as we have Signedbyte in java(-127 to 128).
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I want to read byte and want to store in int array but instead of loop, I want to read the file at once.
Or is there any way to implement Unsigned Byte in java so that I can read the entire file in byte array without corrupting the values which are greater than 128..
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Thanks in advance....

Thanks for replying ......
Actually, I need to take the bytes into an array(int or byte array) with decimal values and further process these decimal values.......
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and while reading the file in int array as done in the below code is inefficient as the number of times the loop runs is more than 34000..... please suggest me some alternative.
int i = 0;
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Dear all,
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hi
iam trying to implement socket programming over UDP. Iam writing for the server side now.I need to send an image file from server to a client via a gateway so basically ive to do hand-shaking with the gateway first and then ive to send image data in a sequence of small messages with a payload of 1 KB.The data message should also include a header of 16 bit sequential number and a bit to indicate end of file.
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package udp;
import java.io.*;
import java.net.*;
import java.util.*;
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         byte[] readBytes = new byte[1024]; // make a byte array with a length equal to the number of bytes in the stream
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HI Rolf.k.
Thank you for the small program it was helpfull.
You got right about that proberly there will be conflict with some spurios data, I can already detect that when writing the data to a spreadsheet file.
I writes the data in such a way, that in each line there will be a date, a timestamp, a tab and a timestamp at the end. That means two columns.
When i set given samplerate up, that controls the rate of the data outflow from the device, (1,56 Hz - 200 Hz),   the data file that i write to , looks unorderet.
i get more than one timestamp and severel datavalues in every line and so on down the spreadsheet file.
Now the question is: Could it be that the function that writes the data to the file, can't handle the speed of the dataflow in such a way that the time stamp cant follow with the data flowspeed. so i'm trying to set the timestamp to be with fractions of the seconds by adding the unit (<digit>) in the timestamp icon but its not working. Meaby when i take the fractions off a second within the timestamp i can get every timestamp with its right data value. Am i in deeb water or what do You mean!??
AAttached Pics part of program and a logfile over data written to file
regards
Zamzam
HFZ
Attachments:
DataFlowWR.JPG ‏159 KB
Datalogfile.JPG ‏386 KB

How can I convert AudioInputStream to byte array ?

Hi
I want to convert audioinputStream to bytearry?
i try like this
ByteArrayOutputStream baos = new ByteArrayOutputStream();
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java.io.IOException: cannot read a single byte if frame size != 1
occur...
plz help me..

Hi,
I haven't tried, but from the API doc I would suggest:
Retrieve the frame size by
int fs = audioInputStream.getFormat().getFrameSize();Allocate a byte array with at least this size and read full frames:
byte[] buf = new byte[fs];
int sz = audioInputStream.read(buf);Write also to your baos a full frame:
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Creating a byte Array dynamically.Urgent Help needed.

Hi there,
I need to create a byte Array with the values
derived from the array and then am passing this byte array
to a method.
Example :
public static void main(String[] args) throws IOException {
char chars[] = {'a','j','a','y'};
byte[] b = {
(byte) chars[0],(byte) chars[1],(byte) chars[2],(byte) chars[3],
//** Send name to a server.
sendRequest(b);
This is all right.
But here I know the size of the character array chars.
If it had more than 4 characters or less than 4,
is there a way to create the byte array dynamically based on the values in the character array?
Please can some one help me with creating a byte array on the fly?
Has anyone understood my question please?
A response is much much appreciated.

The actual problem is this.
The byte array already has some fixed values to it
and i need to append the values of the character array
to this byte array
ie
char chars[] = {'a','j','a','y'};
byte b[] = {
// Predefined values
(byte) 0x01, (byte) 0x7E, (byte)0x03
// I have to add the values from the array here
(byte) chars[0], (byte) chars[1]....
How can I add these values.? The size of the character array
can vary

Display jpeg byte array with JSP !!

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