Srikanth Paladugu

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since Mar 17, 2013
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Recent posts by Srikanth Paladugu

I have a few questions regarding uploading files to a HTTp request (from an applet). This is what I am following:
I am taking a screenshot of the screen using Applet's robot and storing the same on the local file system. The file I have saved on the local file system needs to be uploaded to Apache, eventually to be accessed by PHP.

public void sendBufferedImage(File file, BufferedImage screenImage, String urlPath) throws Exception
{

ImageIO.write(screenImage, "GIF", file); // This is to store the file in a temp location on the local file system.
url = new URL(urlPath);
urlcon = (HttpURLConnection) url.openConnection();
urlcon.setRequestMethod("POST");
urlcon.setDoOutput(true);
urlcon.connect();
out = new DataOutputStream(urlcon.getOutputStream());
out.write(file.getPath().getBytes());
}
Does this complete writing the file to the HTTP request?
1. If so, how should reading the HTTP request work to get the file handle out of the byte array written to the HTTP request?
2. Can a file be written to the HTTP request only via byte array?
3. A sample of how the php code would look like while getting the file handle out of the HTTP request would help a great deal.

Thanks,
7 years ago
I am trying to take a screenshot of the desktop and upload/save it somewhere. Sample code looks like this. The java file is
********************************
public class ScreenShot extends Applet
{
ScreenShotThread t = new ScreenShotThread();
public void init()
{
t.start();
}

public boolean mouseDown(Event e,int x, int y)
{
t.stop();
return true;
}
}
**************************

The thread class looks like this:
*************************
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLConnection;
import javax.imageio.ImageIO;

public class ScreenShotThread extends Thread
{
String request = "xxxx";
public void run()
{
try
{
Dimension d=Toolkit.getDefaultToolkit().getScreenSize();
Robot screenshot = new Robot();
BufferedImage screenImage = screenshot.createScreenCapture(new
Rectangle(d));
sendBufferedImage(request, screenImage);
sleep(1000);
}
catch (Exception e)
{
e.printStackTrace();
}
}

public void sendBufferedImage(String urlpath, BufferedImage screenImage) throws
Exception
{
URL url = new URL(urlpath);
URLConnection urlcon = url.openConnection();
urlcon.setDoOutput(true);
OutputStream out = urlcon.getOutputStream();
ImageIO.write(screenImage, "jpg", out);
out.close();
}
}

Out of these, I have created a jar file which consists of only one class file, that of the applet i.e, "ScreenShot". I have signed the jar file and included it in a HTML for invoking like this

<html>
<applet code="ScreenShot.class" archive="ScreenShot.jar"/>
</applet>
</html>

When I run the html, I get the security warnings, and once I accept to the risk, I get this error. "java.lang.reflect.InvocationTargetException". What I observed is, this error is not originating from within the code I have written, since I could not see any SOPs I used in the above files on the java console.
The interesting part is, if I didn't sign my applet, then I get a security exception at initialization of the robot class in the ScreenShotThread class.

Appreciate any help.

Thanks
S
7 years ago