Displaying byte array

Hi
I want to display a byte array. example : data. In servlet&JSP Combination using the following code I can able to display in web browser:
OutputStream out = response.getOutputStream();
out.write(data);Is there is any ways to display it in the JSF.
Thanks

This is what the console is displaying. But I can view the images.
[7/13/05 16:11:16:308 CDT] 7f5c44f8 WebGroup E SRVE0026E: [Servlet Error]-[Faces Servlet]: java.lang.IllegalStateException: Cannot forward. Response already committed. (Servlet 2.3, SRV 8.4)
     at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:150)
     at com.ibm.faces.context.MultipartExternalContextImpl.dispatch(MultipartExternalContextImpl.java:320)
     at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:142)
     at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)
     at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
     at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:117)
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)
     at com.ibm.ws.webcontainer.servlet.StrictServletInstance.doService(StrictServletInstance.java:110)
     at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet._service(StrictLifecycleServlet.java:174)
     at com.ibm.ws.webcontainer.servlet.IdleServletState.service(StrictLifecycleServlet.java:313)
     at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet.service(StrictLifecycleServlet.java:116)
     at com.ibm.ws.webcontainer.servlet.ServletInstance.service(ServletInstance.java:283)
     at com.ibm.ws.webcontainer.servlet.ValidServletReferenceState.dispatch(ValidServletReferenceState.java:42)
     at com.ibm.ws.webcontainer.servlet.ServletInstanceReference.dispatch(ServletInstanceReference.java:40)
     at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java:983)
     at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java:564)
     at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:200)
     at com.ibm.ws.webcontainer.srt.WebAppInvoker.doForward(WebAppInvoker.java:119)
     at com.ibm.ws.webcontainer.srt.WebAppInvoker.handleInvocationHook(WebAppInvoker.java:276)
     at com.ibm.ws.webcontainer.cache.invocation.CachedInvocation.handleInvocation(CachedInvocation.java:71)
     at com.ibm.ws.webcontainer.srp.ServletRequestProcessor.dispatchByURI(ServletRequestProcessor.java:182)
     at com.ibm.ws.webcontainer.oselistener.OSEListenerDispatcher.service(OSEListener.java:334)
     at com.ibm.ws.webcontainer.http.HttpConnection.handleRequest(HttpConnection.java:56)
     at com.ibm.ws.http.HttpConnection.readAndHandleRequest(HttpConnection.java:618)
     at com.ibm.ws.http.HttpConnection.run(HttpConnection.java:439)
     at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:672)
Thank you,

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================
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==============
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http://www.swiftchart.com/exampleapp.htm#e5
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For further reference have a look at the below links
http://www.jroller.com/page/cagataycivici?entry=acegi_jsf_components_hit_the
http://jsf-comp.sourceforge.net/components/chartcreator/index.html
NOTE:I've tried it personally using MyFaces it was working gr8 but i had a hardtime on deploying my appln on a Portal Server(Liferay).If you find a workaround i'd be glad to know about it.
& there are many BI Open Source Server Appls that can take care of this work too.(Maintainace wud be a tough ask when we go for this)
For, the design perspective had i've been ur PM i wud have choose BI Server if it was corporate web appln on which we work on.
Hope this might be of some help :)
REGARDS,
RaHuL

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[email protected]

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Thanks a lot

Does the byte array contain a JPEG image? Where did
you get the contents of the byte array?yes the array contains the JPEG image, I have a database in PostgreSQL, and the images are stored in blob in the database. I have to call a service in the server and in return it gives me the 3 images as byte arrays, that's the reason I only have the byte arrays. so I tryed saving the images as jpeg files in my hard disk to show them, but it appears that they are not available to show them in Swing after saving them. I can only show the images if I close my application and start it again :-(
I tryed flushing and closing the FileOutputStream after the writting process (fos.write(bytearrayImage);
fos.flush();
fos.close();)
Y also tryed:
fos.write(bytearrayImage);
fos.close();
fos.flush();But it doesn't work either :-(
What do you recommend me?.
Thanks a lot,
Johnny G L

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.

How to save a value in a byte array, retrieve it and display it?

Hi,
I am doing a project for my data structures class that involves saving a value (given in String format) in a byte array (our 'memory'). Initially I just tried casting character by character into the byte array and casting back to char[] for retrieval (using .toString() to return what's supposed to be the original string), but this did not work. I tried the .getBytes() method, applying it to the string and then trying to recover it by placing the contents of the 'memory' in a byte array and applying toString(), but that didn't work either. I looked a bit and found this class, CharsetEncoder and CharsetDecoder. I tried to use these but when I try the compiler tells me I cannot instantiate CharsetDecoder because it is an abstract class. At this point I'm at a loss as to what I can do. Is there any way to place a string in a byte array and then recover the string in it's original format? For example, I might save a value in my particular class of "456". But when I try to recover the value from my 'memory' i.e. the byte array, it comes out like [gnue@hnju.... or something similar. I need it to output the original string ("456").
Below is my code as it is right now, for the methods setValue and getValue.
Thanks!
public void setValue(String value) throws InvalidValueException {
     // stores the given value in the memory area assigned to the variable
          if(this.type.isValidValue(value)){
               bytes = value.getBytes();
               int i,j,k;
               int l=0;//might be wrong?
               int ad=address-(address%4);
               mem.readWord(ad);
               reg=mem.getDataRegister();
               if((address%4)+bytes.length-1<4){
                    for(i=address%4;i<address%4+bytes.length;i++)
                         reg.setByte(i, bytes[i]);
                    mem.setDataRegister(reg);
                    mem.writeWord(ad);
               else if((address%4)+bytes.length-1>=4){
                    if(address%4!=0){
                         for(i=address%4;i<4;i++){
                              reg.setByte(i, bytes);
                              l++;
                         mem.setDataRegister(reg);
                         mem.writeWord(ad);
                         ad+=mem.WORDSIZE;
                    while(ad<address+bytes.length-(address+bytes.length)%4){
                         for(j=0;j<4;j++){
                              reg.setByte(j, bytes[j+l]);
                              l++;
                         mem.setDataRegister(reg);
                         mem.writeWord(ad);
                         ad+=mem.WORDSIZE;
                    if((address+bytes.length)%4!=0){
                         mem.readWord(ad);
                         reg=mem.getDataRegister();
                         for(k=0;k<(address+bytes.length)%4;k++){
                              reg.setByte(k, bytes[k+l]);
                              l++;
                         mem.setDataRegister(reg);
                         mem.writeWord(ad);
               else
                    throw new InvalidValueException("The value passed is not valid.");
     /** Gets the current value of the variable.
     @return current value converted to String
     public String getValue() {
          // returns the current value stored in the corresponding memory area
          // value is converted to String
          bytes=new byte[this.getType().getSize()];
          int i,j,k;
          int l=0;//might be wrong?
          int ad=address-(address%4);
          mem.readWord(ad);
          reg=mem.getDataRegister();
          if((address%4)+bytes.length-1<4){
               for(i=address%4;i<address%4+bytes.length;i++)
                    bytes[i] = reg.readByte(i);
          else if((address%4)+bytes.length-1>=4){
               if(address%4!=0){
                    for(i=address%4;i<4;i++){
                         bytes[i] = reg.readByte(i);
                         l++;
                    ad+=mem.WORDSIZE;
               mem.readWord(ad);
               reg=mem.getDataRegister();
               while(ad<address+bytes.length-(address+bytes.length)%4){
                    for(j=0;j<4;j++){
                         bytes[j+l] = reg.readByte(j);
                         l++;
                    ad+=mem.WORDSIZE;
               if((address+bytes.length)%4!=0){
                    mem.readWord(ad);
                    reg=mem.getDataRegister();
                    for(k=0;k<(address+bytes.length)%4;k++){
                         bytes[k+l] = reg.readByte(k);
                         l++;
          return bytes.toString();

You can certainly put it into a byte array and then construct a new String from that byte array. Just calling toString doesn't mean you'll automatically get a meaningful string out of it. Arrays do not override the toString method, so the use the one inherited from object.
Look at String's constructors.

Convert byte array to table of int

[http://www.codeproject.com/KB/database/PassingArraysIntoSPs.aspx?display=Print|http://www.codeproject.com/KB/database/PassingArraysIntoSPs.aspx?display=Print] Hello friends.
I'm pretty new with PL/SQL.
I have code that run well on MSSQL and I want to convert it to PL/SQL with no luck.
The code converts byte array to table of int.
The byte array is actually array of int that was converted to bytes in C# for sending it as parameter.
The TSQL code is:
CREATE FUNCTION dbo.GetTableVarchar(@Data image)
RETURNS @DataTable TABLE (RowID int primary key IDENTITY ,
Value Varchar(8000))
AS
BEGIN
--First Test the data is of type Varchar.
IF(dbo.ValidateExpectedType(103, @Data)<>1) RETURN
--Loop thru the list inserting each
-- item into the variable table.
DECLARE @Ptr int, @Length int,
@VarcharLength smallint, @Value Varchar(8000)
SELECT @Length = DataLength(@Data), @Ptr = 2
WHILE(@Ptr<@Length)
BEGIN
--The first 2 bytes of each item is the length of the
--varchar, a negative number designates a null value.
SET @VarcharLength = SUBSTRING(@Data, @ptr, 2)
SET @Ptr = @Ptr + 2
IF(@VarcharLength<0)
SET @Value = NULL
ELSE
BEGIN
SET @Value = SUBSTRING(@Data, @ptr, @VarcharLength)
SET @Ptr = @Ptr + @VarcharLength
END
INSERT INTO @DataTable (Value) VALUES(@Value)
END
RETURN
END
It's taken from http://www.codeproject.com/KB/database/PassingArraysIntoSPs.aspx?display=Print.
The C# code is:
public byte[] Convert2Bytes(int[] list)
if (list == null || list.Length == 0)
return new byte[0];
byte[] data = new byte[list.Length * 4];
int k = 0;
for (int i = 0; i < list.Length; i++)
byte[] intBytes = BitConverter.GetBytes(list);
for (int j = intBytes.Length - 1; j >= 0; j--)
data[k++] = intBytes[j];
return data;
I tryied to convert the TSQL code to PL/SQL and thats what I've got:
FUNCTION GetTableInt(p_Data blob)
RETURN t_array --t_array is table of int
AS
l_Ptr number;
l_Length number;
l_ID number;
l_data t_array;
BEGIN
     l_Length := dbms_lob.getlength(p_Data);
l_Ptr := 1;
     WHILE(l_Ptr<=l_Length)
     loop
          l_ID := to_number( DBMS_LOB.SUBSTR (p_Data, 4, l_ptr));
          IF(l_ID<-2147483646)THEN
               IF(l_ID=-2147483648)THEN
                    l_ID := NULL;
               ELSE
                    l_Ptr := l_Ptr + 4;
                    l_ID := to_number( DBMS_LOB.SUBSTR(p_Data, 4,l_ptr));
               END IF;
               END IF;
l_data(l_data.count) := l_ID;
          l_Ptr := l_Ptr + 4;
     END loop;
     RETURN l_data;
END GetTableInt;
This isn't work.
This is the error:
Error report:
ORA-06502: PL/SQL: numeric or value error: character to number conversion error
06502. 00000 - "PL/SQL: numeric or value error%s"
I think the problem is in this line:
l_ID := to_number( DBMS_LOB.SUBSTR (p_Data, 4, l_ptr));
but I don't know how to fix that.
Thanks,
MTs.

I'd found the solution.
I need to write:
l_ID := utl_raw.cast_to_binary_integer( DBMS_LOB.SUBSTR(p_Data, 4,l_ptr));
instead of:
l_ID := to_number( DBMS_LOB.SUBSTR (p_Data, 4, l_ptr));
The performance isn't good, it's take 2.8 sec to convert 5000 int, but it's works.

How to get a string or byte array representation of an Image/BufferedImage?

I have a java.awt.Image object that I want to transfer to a server application (.NET) through a http post request.
To do that I would like to encode the Image to jpeg format and convert it to a string or byte array to be able to send it in a way that the receiver application (.NET) could handle. So, I've tried to do like this.
private void send(Image image) {
    int width = image.getWidth(null);
    int height = image.getHeight(null);
    try {
        BufferedImage buffImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        ImageIcon imageIcon = new ImageIcon(image);
        ImageObserver observer = imageIcon.getImageObserver();
        buffImage.getGraphics().setColor(new Color(255, 255, 255));
        buffImage.getGraphics().fillRect(0, 0, width, height);
        buffImage.getGraphics().drawImage(imageIcon.getImage(), 0, 0, observer);
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        JPEGImageEncoder jpeg = JPEGCodec.createJPEGEncoder(stream);
        jpeg.encode(buffImage);
        URL url = new URL(/* my url... */);
        URLConnection connection = url.openConnection();
        String boundary = "--------" + Long.toHexString(System.currentTimeMillis());
        connection.setRequestProperty("method", "POST");
        connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
        String output = "--" + boundary + "\r\n"
                      + "Content-Disposition: form-data; name=\"myImage\"; filename=\"myFilename.jpg\"\r\n"
                      + "Content-Type: image/jpeg\r\n"
                      + "Content-Transfer-Encoding: base64\r\n\r\n"
                      + new String(stream.toByteArray())
                      + "\r\n--" + boundary + "--\r\n";
        connection.setDoOutput(true);
        connection.getOutputStream().write(output.getBytes());
        connection.connect();
    } catch {
}This code works, but the image I get when I save it from the receiver application is distorted. The width and height is correct, but the content and colors are really weird. I tried to set different image types (first line inside the try-block), and this gave me different distorsions, but no image type gave me the correct image.
Maybe I should say that I can display the original Image object on screen correctly.
I also realized that the Image object is an instance of BufferedImage, so I thought I could skip the first six lines inside the try-block, but that doesn't help. This way I don't have to set the image type in the constructor, but the result still is color distorted.
Any ideas on how to get from an Image/BufferedImage to a string or byte array representation of the image in jpeg format?

Here you go:
private static void send(BufferedImage image) throws Exception
    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
    ImageIO.write(image, "jpeg", byteArrayOutputStream);
    byte[] imageByteArray = byteArrayOutputStream.toByteArray();
    URL url = new URL("http://<host>:<port>");
    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
    connection.setDoOutput(true);
    connection.setRequestMethod("POST");
    OutputStream outputStream = connection.getOutputStream();
    outputStream.write(imageByteArray, 0, imageByteArray.length);
    outputStream.close();
    connection.connect();
    // alternative to connect is to get & close the input stream
    // connection.getInputStream().close();
}

How to put a String into a byte array

How can i put a String into a byte array byte[]. So that i can send it to the serial port for output to an LCD display. Cheers David

javadocs for String
getBytes
public byte[] getBytes()
Encodes this String into a sequence of bytes using the platform's default charset, storing the result into a new byte array.
Returns:
The resultant byte arraySince:
JDK1.1

Displaying byte array

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