Image reading problem in servlet
Image reading problem in servlet
I am reading an image in servlet and writing it to ServletOutputStream
The following code works fine unless I change the size of the byte array (for increasing download speed) from 8 to something like 128 or any other higher value
If I change the value of byte array size the image does not get downloaded properly, I mean the quality of the image changes, it does not looks like the original imageURL url = new URL("http://www.mysite.com/images/img1.jpg");
URLConnection con = url.openConnection();
con.setUseCaches(false);
BufferedInputStream in = new BufferedInputStream(con.getInputStream());
BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());
byte b[] = new byte[8];
while(in.read(b) != -1)
out.write(b);
out.flush();
out.close();
in.close();what do I change
byte array size
or use the constructor of BufferedInputStream with 2 parameter
or use the constructor of BufferedOutputStream with 2 parameter
or use flush outside while loop or what else
Change your while loop to:
int count;
while((count = in.read(b)) != -1)
out.write(b, 0, count);
out.flush();
}The penultimate time read is called, it may not fill the entire byte array. You only want to write out however much was read into the array.
For better performance, you should move the flush() outside of the loop too. BufferedOutputStream will flush automatically when its internal buffer is full.
Similar Messages
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hi,
i'm reading a gif image from an input stream like this:
InputStream input = document.getBlobProperty(property).getInputStream();
byte[] theBytesTemp = new byte[1048576];
int length = input.read(theBytesTemp);
byte[] theBytes = new byte[length];
System.arraycopy(theBytesTemp, 0, theBytes, 0, length);
BufferedImage originalImage = new ImageParsing().getBufferedImage(theBytes);
input.close();
(the document.getBlobProperty(property).getInputStream();) is provided by the CMS we use and just returns an input stream. my problem is that the BufferedImage originalImage = new ImageParsing().getBufferedImage(theBytes); (that's part of the sanselan imaging library) throws an exception (java.io.IOException: GIF: corrupt block) for larger images (not sure about the size in detail. images about 10K seem to work, images of about 50K don't).
Any ideas?
MarcoHello, Im having the same problem, but im getting the data from a database, and try to output via JSP and getting a currupted image,
How can i implement this code database binary data, since i cant get the data into input stream.
eg:
* how to copy data in the data field as byte[] to the InputStream,
* how to use ImageParsing().getBufferedImage(imageBytes); which i can't able to find the class for it,
ByteArrayOutputStream byteArrayOut = new ByteArrayOutputStream();
int bufferLength = 1024*1024;
byte[] buffer = new byte[bufferLength];
int length = 0;
/* Im having problem of getting the data to the input stream on below line */
InputStream input = af.getImg();
while ((length = input.read(buffer)) != -1) {
byteArrayOut.write(buffer, 0, length);
input.close();
byteArrayOut.close(); //Has no real effect
byte[] imageBytes = byteArrayOut.toByteArray();
/* cant find the class for ImageParsing() */ BufferedImage originalImage = new ImageParsing().getBufferedImage(imageBytes);
OutputStream out = response.getOutputStream();
/* cant write BufferedImage to the out put stream */ out.write( imageBytes );
response.flushBuffer(); You shouldn't try to read all the bytes at one time
like that, there are no quarantees that the read
opperation will fill the array or read all the bytes
in the inut stream (this the need to return the
length read).
Instead, put the read into a loop, reading into a
buffer, then append the buffer onto a byte array
output stream...
ByteArrayOutputStream byteArrayOut = new
ByteArrayOutputStream();
int bufferLength = 1024*1024;
byte[] buffer = new byte[bufferLength];
int length = 0;
InputStream input = ...
while ((length = input.read(buffer) != -1)
byteArrayOut.write(buffer, 0, length);
input.close();
byteArrayOut.close(); //Has no real effect
byte[] imageBytes = byteArrayOut.toByteArray();
BufferedImage originalImage = new
ImageParsing().getBufferedImage(imageBytes); -
Problem in sending image from applet to servlet
dear friends,
i have a need to send an image from applet to servlet via HttpConnection and getting back that image from applet.
i am struggling with this sice many hours and got tired by searching any post that would help me but haven't got yet.
i tried using this code but it dosent make any execution sit right. i got NPE at ImageIcon.getDescription() line;
at applet side
jf.setContentPane(getJContentPane());
FileDialog fd=new FileDialog(jf,"hi");
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fd.setVisible(true);
v=new Vector();
try{
FileInputStream fis=new FileInputStream(new File(fd.getDirectory()+fd.getFile()));
byte[] imgbuffer=new byte[fis.available()];
fis.read(imgbuffer);
ImageIcon imgdata=new ImageIcon(imgbuffer);
v.add(0,imgicon);
String strwp ="/UASProject/Storeimage";
URL servletURL = new URL(getCodeBase(),strwp);
HttpURLConnection servletCon = (HttpURLConnection)servletURL.openConnection();
servletCon.setDoInput(true);
servletCon.setDoOutput(true);
servletCon.setUseCaches(false);
servletCon.setDefaultUseCaches(false);
servletCon.setRequestMethod("POST");
servletCon.setRequestProperty("Content-Type", "application/octet-stream");
servletCon.connect();
ObjectOutputStream oboutStream = new ObjectOutputStream(servletCon.getOutputStream());
oboutStream.writeObject(v);
v.remove(0);
oboutStream.flush();
oboutStream.close();
//read back from servlet
ObjectInputStream inputStream = new ObjectInputStream(servletCon.getInputStream());
v= (Vector)inputStream.readObject();
imgicon=(ImageIcon)v.get(1);
showimg.setIcon(imgicon);
this.getContentPane().validate();
this.validate();
inputStream.close();
// repaint();
}catch(Exception e){e.printStackTrace();} and this is at servlet side
try {
Vector v=new Vector();
ObjectInputStream inputFromjsp = new ObjectInputStream(request.getInputStream());
v = (Vector)inputFromjsp.readObject();
imgicon=(ImageIcon)v.get(0);
inputFromjsp.close();
System.out.println(imgicon.getDescription());
v.remove(0);
v.add(1,imgicon);
//sending back to applet
response.setContentType("application/octet-stream");
ObjectOutputStream oboutstream=new ObjectOutputStream(response.getOutputStream());
oboutstream.writeObject(v);
oboutstream.flush();
oboutstream.close();
} catch (Exception e) {e.printStackTrace();} i really need your help. please let me out of this headche
thanks
Edited by: san_4u on Nov 24, 2007 1:00 PMBalusC wrote:
san_4u wrote:
how can i made a HttpClient PostMethod using java applets? as i have experience making request using HttpURLConnection.POST method. ok first of all i am going make a search of this only after i will tell. please be onlineOnce again, see link [3] in my first reply of your former topic.
yeah! i got the related topic at http://www.theserverside.com/tt/articles/article.tss?l=HttpClient_FileUpload. please look it, i am reading it right now and expecting to be reliable for me.
well what i got, when request made by html code(stated above) then all the form fields and file data mixed as binary data and available in HttpServletRequest.getinputstream. and at servlet side we have to use a mutipart parser of DiskFileItemFactory class that automatically parse the file data and return a FileItem object cotaing the actual file data,right?.You can also setup the MultipartFilter in your environment and don't >care about it further. Uploaded files will be available as request attributes in the servlet.is the multipartfilter class file available in jar files(that u suggested to add in yours article) so that i can use it directly? one more thing the import org.apache.commons.httpclient package is not available in these jar files, so where can got it from?
one mere question..
i looked somewhere that when we request for a file from webserver using web browser then there is a server that process our request and after retrieving that file from database it sends back as response.
now i confused that, wheather these webservers are like apache tomcat, IBM's webspher etc those processes these request or there is a unique server that always turned on and process all the request?
because, suppose in an orgnisation made it's website using its own server then, in fact, all the time it will not turned on its server or yes it will? and a user can make a search for kind of information about this orgnisation at any time.
hopes, you will have understand my quary, then please let me know the actual process
thanks
Edited by: san_4u on Nov 25, 2007 11:25 AM -
i have LR5 on a mac book pro with a WD external hard drive with my with my LR5 images . my problem is my external drive is corrupted .i was told by apple that my macshow the hard drive is there but it is not moumting and have to be reformat. i have to use recovery data to save my images on my external before i can refomat.iam willing to lose my images on my extenal hard drive but i would like to know can i erase my LR5 images and start over or delete LR5 and download it again
Simply start a new catalog:
File >> New Catalog
Choose a new name and save.
When the empty catalog launches you are ready to start over. -
My iMac 27" Late 2012 has Image Persistence Problem
I'm wondering what to do about an annoying image persistence problem on my 27" late 2012 iMac. I got the iMac just a few days ago. Monday actually, so 4 days ago.
It's the 3.4GHz i7, 8GB, NVIDIA 680MX 1TB fusion drive model.
Overall it has become the love of my life, but the image persistence thing is getting harder to ignore. This happens after only a few minutes of use. If I follow Apple's instruction on dealing with LCD image persistence, I can make it go away for a while, but it comes back very quickly.
It is extremely noticeable on a plan dark background. It looks as thought he screen has been left on for a very long time with the same windows open, but it occurrs in less than 5 minutes of use with nothing more intense than a bit of web surfing.
I've read that this is happening a great deal on these new iMacs, particularly teh 27" machines.
While the problem seems to be known to those of us afflicted I don't know if Apple has acknowledged an issue or not.
Here is a sample of the complaints: http://forums.macrumors.com/showthread.php?t=1509571
I can make the ghost image vanish by bringing up an all white scree for a minute or so or using LCD Scrub.
I'm wondering if anyone else has foun a solution other than asking for a replacement computer, which Apple seems to be granting on this issue?Avoiding image persistence on Apple (IPS) displays
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If you cannot resolve the issue yourself, then return the computer for a replacement. You may do this freely within 14 days from date of purchase, so don't delay. -
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My J2ee Server gives FATAL Error it says it should be work on JDK1.2 or later.
My JDK is :-j2sdk1.4.2_04
MY J2EE Server is:-j2sdkee1.2.1
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Please help me and give the desired result as soon as you all can
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My JDK is :-j2sdk1.4.2_04
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Following is my code, someone can give me an advise?
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%>Don't use jsp for that, use servlet. because the jsp engine will send a blank lines to outPutStream corresponding to <%@ ...> tags and other contents included in your /html/base.jsp file before sending the image. The result will not be treated as a valid image by the browser.
To test this, type directly showcontent.jsp on your browser, and view it source.
regards -
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http://dirtysouthink.com/gallery/dustin2.htmlThis has very little to do with Dreamweaver. DW is merely a tool to assist you in building a web site. It is purely a matter of styling (CSS).
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CONTAINER will NOT fit inside GALLERY or BODY-CONTENT
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I had this in my last W7-installation and got it again in W8 after the first few weeks.
There are a lot of reports about this problem out there and adhoc solutions like 'clear the cache' or 'reinstall and drink ice tea' that do not work. It is obviously a file request error. It is all about finding out which server addresses get blocked by your computer.
Solution: Go to your firewall and your Anti-virus-program. There must be a whitelist option. In Kaspersky, check the web-options, the banner-options and the firewall-options, because the all have whitelists. The following addresses have to be whitelisted:
*.apple
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ax.init.itunes.apple.com
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Hi there,
I try to retrieve more than one images from database to Servlet/JSP . However, I get only one images in the result set. Here is my code. Please Help .
How do I display more than one images ( multiple rows ) from database to Servlet ?.
When I retrieve, I got 3 rows of binary data, but I don't know how to display it on the Servlet/JSP pages.
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String driver = ""
String URL = "";
String Host = "";
String UN = ""; //assign your username here
String PW = ""; //assign your password here
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_driver = (SybDriver) c.newInstance();
DriverManager.registerDriver( (SybDriver) _driver );
NGScon = DriverManager.getConnection( URL + Host, UN, PW );
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// Got some other type of exception. Dump it.
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os.println("Error in SQL2Exception" + sqle.getMessage());When I retrieve, I got 3 rows of binary data, but I don't know how to display it on the Servlet/JSP pages.I will pick this bit of your post, because you seemed to have several partly-overlapping questions.
You are going about this wrong. You need to decide what your HTML will look like before you start writing servlet code. In this case you want to have something like a table, with an image in each row, right? Now what does the HTML for that look like? It's a <table> element, and so on, but what about the images? Well this is HTML, so it can't contain the binary images. It has to contains links to the images, and the browser will download the image from each of those links and put all of the downloads together into the page it displays.
That means you can't do it all with one servlet. You need a main servlet that generates the HTML, with the <table> element and the links to the images. Probably you need some DB calls here to find out how many images you're going to have, but you don't need to get them in this servlet. You just need to generate a link for each of them.
Then you need a second servlet that gets an image. It's going to get a single row from the DB and return the binary image you read from that row. Make sure to use "image/jpg" or whatever's appropriate instead of "text/html" in your response's content type here.
I will leave you to carry on from here. First step is to design the HTML that your main servlet will produce; remember that the links it generates need to carry enough information for the second servlet to be able to find the right image in the DB.
PC² -
I created an image map back in RoboHelp 6 and it worked perfectly. When I converted my project recently to RoboHelp 8, the image map pop-ups are not working correctly. I've checked the properties of the image map and they are correct. But the pop-up boxes do not display correctly. I'm going to attached an example of how the same one displays in RH6 and RH8 and a screen shot of my settings.
Can anyone help me with this?After much trial and error testing around this image map issue, I cannot seem to find a fix for image maps within RoboHelp 8. No matter what I've tried (and it was a lot), nothing seems to fix the image map problem. Even creating a new image map on a new page with totally different info, pop up pages, image, etc. and turning OFF all breadcrumbs - the image map does not display correctly once generated (nor in preview).
I have found a VERY TEDIOUS workaround for this (that I'm not happy about). If I take my original pop-up topic htm pages (9 of them) from my RoboHelp 6 project and the original eHlpDhtm.js file from RH6 and place them in my output Help file from RH8 (overwriting the RH8 with the RH6 files), then the image map works correctly.
The eHlpDhtm.js file has many more scripts in it than just the image map triggers, so I'm not sure what all else I'm affecting when I'm fixing one problem (i.e. not sure how many more problems I'm creating at the same time when fixing one problem.)
It's almost like the "breadcrumbs" feature in RH8 has broken the image maps feature in RH8.
I'm still up for more suggestions as how to fix this if anyone has any ideas. -
How can I save the images and movies on a external Disk from iphoto program, to protect the images when problems occur in the laptop,
Most Simple Back Up:
Drag the iPhoto Library from your Pictures Folder to another Disk. This will make a copy on that disk.
Slightly more complex: Use an app that will do incremental back ups. This is a very good way to work. The first time you run the back up the app will make a complete copy of the Library. Thereafter it will update the back up with the changes you have made. That makes subsequent back ups much faster. Many of these apps also have scheduling capabilities: So set it up and it will do the back up automatically.
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Problem: codebase, jar and image reloading problem please help!
Hi Java Gurus,
I have written an applet that extends JApplet for viewing webcam. In order to reduce the download time I put my classes into a doorcam.jar file. The following is my <applet> tag in my html file.
<applet code="CameraApplet.class"
archive="doorcam.jar"
codebase = "webcam/classes"
width="375" height="475">
<param name="imagePath" value="http://judge/webcam/images">
<param name="webCamImage" value="door.jpg">
<param name="COMPort" value="COM2">
<param name="frameRate" value="10"> <!-- could not exceed more than 10-->
<param name="host" value="judge">
</applet>
The fist problem is that my class file does not get loaded from the jar file if i provide the "codebase" attribute as above. Instead the browser load every single class file from the webserver. This has some problem too. Coz the browser sometimes just thorough NullPointerException or ClassNotFoundException. After much of debugging I found out that the problem is the IE browser which seldom fails to load classes or image file from the server. If i referesh the browser the applet and all its classes loaded successfully and runs smoothly. This behaviour never occurs when running with "appletviewer".
I wanted all my classes to be loaded from my jar file. After much of trial and error I found out that if i remove "codebase" attribute the browser loads the classes from my jar file and applet loads very fast. This is where the second problem comes in. The browser does not reload my webcam image file so that the webcam become alive with live images, like before.
If I run on "appletviewer" everything works fine my web cam is displayed properly. But in IE browser the image does not get reloaded when I refresh my image to give live to my webcam display. The refresh method is given below.
private void refresh(final URL url) {
Image webCamImage =getImage(url);
webCamImage.flush(); // flush out the previous image
webCamImage = getImage(url); // get a new image
webCamImageIcon.setImage(webCamImage); webCamImageIcon.paintIcon(webCamLabel, webCamLabel.getGraphics(), 15, 15);
When I add the "codebase" attribute back, the image gets reloaded for every refresh() and everything works fine. But the classes are also loaded from the server. And occasionally also suffers Class loading and image loading problem. As I presented earlier, when I do refreshing in the browser everything gets loaded and the applet function correctly with web cam displaying very well.
The problem is so strange that I could not find any way to solve it.
It would be a great help to me if somebody provide me some work around to the problem.
I tested on Windows 2000, Windows XP, IE 5.5, IE 6 with J2SDK 1.4.0.
Thank you all very much in advance.
best regards,
JudgeThank you so much for the suggestions. I did tried the way u suggested. The problem still the same.
I think its the problem between IE browser and Java Plug-in.
I which SUN would find these incompatibilities and solve these problems.
I even tried using java SDK and plug-in 1.4.1 it even worst. It can't even load an applet. And it does not show any loading messages nor any error messages. It just show a cross sign on the upper left coner.
I would be so glad, if Sun would try to eliminate the inconsistancies such as caching, loading, initializing etc between browser and its Java plug-In. For example, applets behave well in appletviewer and behave unpredictably in browser environment.
I have seen so many people in the forums with all sorts of problems because of this.
Right now I m desperately looking for work around to my problem.
If somebody would provide me with the solution to my problem it would be a great help to me.
thank you all so much.
best regards,
Judge
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