Give me a hand please!!
I have applet running in my webpage, and I'd like to keep track of how often it downloads by client user and how long s/he runs it. it is possible for applet to write in a file at the server and how. how can implement this function?
Hi almahd,
Although I haven't done anything like this -- and I haven't got time to try it out myself -- I can see two possibilities.
1. You can execute a CGI script or servlet on the web-server (that downloads your applet) each time the applet is downloaded. If I'm not mistaken, then the best place to call the CGI/servlet would be from the applet's "init()" method. An example of how to execute a CGI script fro a java class can be found here:
http://www.javaworld.com/javaworld/jw-03-2001/jw-0323-traps.html
2. Since an applet can communicate with the web-server that downloaded it, you should be able to simply update a file located on the server. You would have to use that file's URL to locate it (I would imagine). I don't really know what sort of URL is required, though.
Hope this has helped you (for what it's worth :-)
Good Luck,
Avi.
Similar Messages
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Exception when readObj() - please give me a hand!
I am writing a Client/Server application where Server simply sends object to the client. The first object goes well but when the client side reads the second object, the exception caught was "Type code out of range, is -84". Can anybody kindly give me a hand? Thanks very much in advance!
Result on Client:
C:\thesisTest>java TestCli
@Line 1: Get ready!!!
Type code out of range, is -84
receive error.
Source for Server :
import java.net.*;
import java.io.*;
import java.util.*;
import sendNode;
public class TestSer {
static sendNode sendNodeObj = new sendNode();
static String inputLine;
public static void main(String[] args) throws IOException {
ServerSocket serverSocket = null;
try {
serverSocket = new ServerSocket(4444);
} catch (IOException e) {
System.err.println("Could not listen on port: 4444.");
System.exit(1);
Socket clientSocket = null;
try {
clientSocket = serverSocket.accept();
} catch (IOException e) {
System.err.println("Accept failed.");
System.exit(1);
OutputStream o = clientSocket.getOutputStream();
ObjectOutput out=new ObjectOutputStream(o);
BufferedReader in = new BufferedReader(
new InputStreamReader(
clientSocket.getInputStream()));
sendNodeObj.sendMsg="@Line 1: Get ready!!!";
sendNodeObj.typeNode=-1;
out.writeObject(sendNodeObj);
out.flush();
out=new ObjectOutputStream(o);
sendNodeObj.sendMsg="@Line 2: Please input Start";
sendNodeObj.typeNode=-1;
out.writeObject(sendNodeObj);
out.flush();
inputLine = in.readLine();
while (!inputLine.equalsIgnoreCase("Start")) {
sendNodeObj.sendMsg="@Error, Please input Start";
sendNodeObj.typeNode=-1;
out.writeObject(sendNodeObj);
out.flush();
inputLine = in.readLine();
out.close();
in.close();
clientSocket.close();
serverSocket.close();
Source for Client:
import java.io.*;
import java.net.*;
import java.util.*;
import java.applet.Applet;
import sendNode;
public class TestCli extends Applet {
static sendNode recNodeObj=null;
public static void main(String[] args) throws IOException {
BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));
Socket kkSocket = null;
PrintWriter out = null;
try {
kkSocket = new Socket("127.0.0.1", 4444);
out = new PrintWriter(kkSocket.getOutputStream(), true);
} catch (UnknownHostException e) {
System.err.println("Don't know about host.");
System.exit(1);
} catch (IOException e) {
System.err.println("Couldn't get I/O for the connection to: taranis.");
System.exit(1);
InputStream i= kkSocket.getInputStream();
ObjectInput in= new ObjectInputStream(i);
try {
recNodeObj = (sendNode)in.readObject();
System.out.println(recNodeObj.sendMsg);
recNodeObj = (sendNode)in.readObject();
System.out.println(recNodeObj.sendMsg);
if (recNodeObj.sendMsg.equalsIgnoreCase("@Line 2: Please input Start")) {
out.println("Start");
} catch (Exception e) {
System.out.println(e.getMessage());
System.out.println("receive error.");
System.exit(1);
out.close();
in.close();
stdIn.close();
kkSocket.close();You are not being consistent in the way you use ObjectOutputStream and ObjectInputStream.
For every new ObjectOutputStream you create you need a corresponding new ObjectInputStream, because ObjectOutputStream writes a header that ObjectInputStream reads.
In general, you probably don't want to use multiple OutputOutputStream objects on a given underlying socket, because it is ineffecient in the way class names etc are encoded.
Sylvia. -
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Download and install the Combo Updater for the version you prefer from support.apple.com/downloads/. -
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I first have to read from the file not the string.I
know how to read from a file. Now the problem ishow
to compare a character from a txt file!You fail to understand, that you have read the data
from the file into a string. Now loop over all
characters in the string. Forget about the file.
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Kaj -
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Forgotten Security Questions / Answers...
See Here > Apple ID: Contacting Apple for help with Apple ID account security
Ask to speak with the Account Security Team...
Or Email Here > Apple Support iTunes Store Contact
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Note:
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While YOU may not have attempted to jailbreak the phone, SOMEONE ELSE did. Error 1015 occurs by attempting to restore a previously jailbroken phone.
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Terms of Use of this forum prohibit the discussion of jailbroken phones. You'll have to scour the internet for a solution to your problem, if indeed one exists. -
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i am trying to develop a distributed system that needs password checking in order to access.
Hence i need to check user password in my database that resides in my server.
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am i correct... pls give a helping hand...import java.io.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class LoginServlet extends HttpServlet{
private Connection con;
private PreparedStatement pstmt;
private Statement stmt;
private ResultSet rs;
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private String login="",password="",done="";
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throws ServletException, IOException{
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password = ""+request.getParameter("password");
done = ""+request.getParameter("done");
session = request.getSession(true);
PrintWriter out = response.getWriter();
out.println(login);
out.println(password);
try{
Class.forName("org.gjt.mm.mysql.Driver");
}catch(Exception e){
out.println(e.getMessage());
try{
con = DriverManager.getConnection("jdbc:mysql:///senji");
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pstmt = con.prepareStatement("select password from logon where login = ?");
pstmt.setString(1,login);
rs = pstmt.executeQuery();
pass = "";
while(rs.next()){
pass = rs.getString(1);
if(pass.equals(password)){
session.setAttribute("login",login);
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pass = "";
response.sendRedirect("/ksenji/quiz2/shoponline.jsp");
}else{
response.sendRedirect(done.substring(5));
else{
response.sendRedirect("/ksenji/quiz2/login.jsp?"+done);
else{
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}catch(SQLException ex){
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Here is my codes, I try to save the "drawing" Panel graphics into a jpg, and I can compile it, however, when I run it, system tell me" NullPointerException"!!!
I'm out of ideas, Please help, Thank you So much!!!
import java.awt.*;
import java.awt.image.*;
import javax.swing.*;
import javax.imageio.*;
import com.sun.image.codec.jpeg.*;
import java.io.*;
import java.awt.geom.*;
public class test3 extends JFrame
public test3()
super("test");
setSize(800, 600);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
drawingArea drawing = new drawingArea();
Container c = getContentPane();
c.add(drawing, BorderLayout.CENTER);
int paneWidth = drawing.getWidth();
int paneHeight = drawing.getHeight();
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buffer = (BufferedImage)drawing.createImage(paneWidth, paneHeight);
Graphics graphic = buffer.getGraphics();
if(graphic.getClipBounds()!=null)
graphic.setClip(0, 0, paneWidth, paneHeight);
drawing.paint(graphic);
try
File file = new File("test.jpg");
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JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
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encoder.setJPEGEncodeParam(param);
param.setQuality(1.0f,false);
encoder.encode(buffer);
out.flush();
out.close();
catch(IOException ioe)
System.out.println(ioe.toString() + "something wrong");
catch(RasterFormatException rfe)
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setVisible(true);
class drawingArea extends JPanel
public void paintComponent(Graphics g)
Graphics2D g2D = (Graphics2D)g;
Rectangle2D.Float rect = new Rectangle2D.Float(50F, 50F, 20F, 20F);
g2D.draw(rect);
public static void main(String args[])
test3 t = new test3();
}1 - the graphics context of a Component is null until the Component is realized, ie, until you call pack or setVisible on its top-level Container
2 - you can make up a BufferedImage and save it without using a Component to show it
3 - using a 'png' extension seems to give better results and a smaller file size than 'jpg'
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.net.*;
import javax.imageio.ImageIO;
import javax.swing.*;
public class ImageTest
ImageTestPanel imagePanel;
ImageTestUtility utility;
BufferedImage image;
public ImageTest()
createImage();
imagePanel = new ImageTestPanel();
utility = new ImageTestUtility();
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(getUIPanel(), "North");
f.getContentPane().add(imagePanel);
f.setSize(400,400);
f.setLocation(200,200);
System.out.println("imagePanel graphics context before visible = " +
imagePanel.getGraphics());
f.setVisible(true);
System.out.println("imagePanel graphics context after realized = " +
imagePanel.getGraphics());
private void createImage()
int w = 200;
int h = 200;
image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = image.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2.setPaint(Color.white);
g2.fillRect(0, 0, w, h);
g2.setPaint(Color.blue);
g2.draw(new Rectangle2D.Double(w/16, h/16, w*7/8, h*7/8));
int dia = Math.min(w, h)/4;
g2.setPaint(Color.red);
g2.draw(new Ellipse2D.Double(w/2 - dia/2, h/2 - dia/2, dia, dia));
g2.setPaint(Color.green.darker());
g2.draw(new Line2D.Double(w/16, h*15/16, w*15/16, h/16));
g2.dispose();
private JPanel getUIPanel()
final JButton
saveComponent = new JButton("save component"),
saveImage = new JButton("save image");
ActionListener l = new ActionListener()
public void actionPerformed(ActionEvent e)
JButton button = (JButton)e.getSource();
if(button == saveComponent)
utility.saveComponent(imagePanel);
if(button == saveImage)
utility.saveToFile(image);
saveComponent.addActionListener(l);
saveImage.addActionListener(l);
JPanel panel = new JPanel();
panel.add(saveComponent);
panel.add(saveImage);
return panel;
public static void main(String[] args)
new ImageTest();
class ImageTestPanel extends JPanel
public ImageTestPanel() { }
protected void paintComponent(Graphics g)
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2.setPaint(Color.red);
g2.draw(new Rectangle2D.Float(50, 50, 20, 20));
class ImageTestUtility
public BufferedImage loadImage(String fileName)
BufferedImage image = null;
try
URL url = getClass().getResource(fileName);
image = ImageIO.read(url);
catch(MalformedURLException mue)
System.err.println("url: " + mue.getMessage());
catch(IOException ioe)
System.err.println("read: " + ioe.getMessage());
return image;
public void saveComponent(Component c)
int w = c.getWidth();
int h = c.getHeight();
BufferedImage bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = bi.createGraphics();
c.paint(g2);
g2.dispose();
saveToFile(bi);
public void saveToFile(BufferedImage image)
try
ImageIO.write(image, "jpg", new File("imageTest.jpg"));
catch(IOException ioe)
System.err.println("write: " + ioe.getMessage());
} -
please help me!
HttpServletRequest request;
i use "request.setAttribute("value",value);" in a method of "Action" to save the value and use "request.getAttribute("value");" to get the value in "jsp" which findForward from the method, but there are two servers being used which are deployed same. my problem is that when the servers are changing randomly to serve you, can i get the value correctly everytime? if the answer is "no", can you help me solve this problem?
thank you!
jjrainbowYou have two clustered servers, either of which can handle the request?
As I understand it, once a server receives a request it should handle the entire request. Forwarding to another jsp/servlet is purely an internal transition, and so should not result in changing the server.
If you can make that assumption, then your request attributes will always be present and correct.
So I think the answer to your question: "can I get the value correctly every time" is yes. Unless you are doing your own custom clustering which does interfer in the request cycle in which case all bets are off. Most likely though, there is no issue . -
PLEASE! Give me a hand! Ti4800SE TD8X
HI!
I installed this card GeForce 4 Ti 4800..everything works out fine, but one thing that i just cant figure out ishow come this sound problem always happens...ok, as i restart my computer, i play music or video (or having something audio on the background ) and then i click the "Start" sign on the left bottom corner..the sound goes off ( it doesnt only happen on when i am clicking "start" sign, It happens so often when i work around on my computer while have any audios playing) But as i restart computer everything works right again. :( Im so pissed off that i cant hear the sound when i play CS. I put the old card back it worked as good as before.. ;(
I've tried to installed VIA 4 in 1 new driver (it didnt help :( )
Installed Nvidia 43.45(right now) i tried 41.09,its the same no help.
Update new Bios for VGA ( no help)
OS:windows XP Pro (SP1)
Sys:P3 800mhz
Mainboard: Asus CUV4x
mem:256mb
HD: 40GB
Old card: ATi rage128 (32mb)gho,
You said you were using the new VIA drivers?
These?-------> VIA Hyperion 4in1 v4.46, released 10 March 2003
Have you tried previous releases or archived drivers?
Link to "AGP Explained" found at Anandtech
Where does it get all that RAM from?
I mentioned before that AGP allows your graphics card to access your system's main memory, therefore AGP memory is simply dynamically-allocated portions of your system's main memory. Meaning that AGP provides a fast access path to your system memory which is provided by some integrated functions in the chipset which allows the AGP card and the software using AGP to access the same memory addresses. This process allows the graphics hardware to address large texture maps as single data objects. The hardware that provides this support is referred to as the Graphics Address Remapping Table, or GART for short. Below is an illustration of how the data is addressed using the GART:
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