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03/11/2009 at 11:49AM PDT, ID: 24221125
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8.6

Applet not displayed in browser

Asked by akah123 in Java Programming Language, WebApplications, Apache Web Server

Tags: applet browser signed packages display error java

Basically I had a problem with a applet not being able to be viewed whilst in apache tomcat. It was able to be viewed locally. A link to to my old question: http://www.experts-exchange.com/Programming/Languages/Java/Q_24189477.html

I have made some changes to my original code from the previous question. The GUI has been modified slightly. The read in a file and display it in a message dialog box. The CODE WORKS FINE when it is an application. But I need it as an applet and am unable to get it to work. A similar error message to the one I had before is displayed.

My ultimate goal is to have a signed applet that can work from the apache tomcat server.

So the main problem is that nothing but a grey box is displayed when I attempt to run the applet. A error message is present in the blank screen.

My app is a simple browser that will display webpages that is run as a applet. Previously it worked but could not be loaded by tomcat, however since my changes I am unable to even run it locally. So I think it must be an issue with the code.

The java file along along with the html is located in the directory: C:\base_1\com_1\test_1

I think possibly a problem with the GUI is the most probable. 
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<HTML>
<Head>
<Title> A Simple Program </Title>
<Body>
 
<Applet
 
Code="com_1.test_1.Mini_Applet_Browser_1"
 
width="800" height="850">
</Applet>
 
</Body>
</HTML>
 
package com_1.test_1;
import java.applet.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.net.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.html.*;
import java.util.StringTokenizer;
 
public class Mini_Applet_Browser_1 extends Applet implements HyperlinkListener {
	    // These are the buttons for iterating through the page list.
	    private JButton backButton, forwardButton,  test, viewDomains;
		
		JPanel mainPanel;
	    
	    // Page location text field.
	    private JTextField locationTextField;
	    
	    // Editor pane for displaying pages.
	    private JEditorPane displayEditorPane;
	    
	    // Browser's list of pages that have been visited.
	    private ArrayList pageList = new ArrayList();
		
		//Holds domains from file
		private ArrayList<String> domainList = new ArrayList<String>();
	    
	    // Constructor for Mini Web Browser.
	    public void init() {
	        // Set application title.
	        //super("Mini Browser");
	        
	        // Set window size.
	        setSize(640, 480);
	        
	        /** Handle closing events.
	        addWindowListener(new WindowAdapter() {
	            public void windowClosing(WindowEvent e) {
	                actionExit();
	            }
	        }  };
	        **/
	  
	        
	        
	        // Set up file menu.
	        JMenuBar menuBar = new JMenuBar();
	        JMenu fileMenu = new JMenu("File");
	        fileMenu.setMnemonic(KeyEvent.VK_F);
	        JMenuItem fileExitMenuItem = new JMenuItem("Exit",
	                KeyEvent.VK_X);
	        fileExitMenuItem.addActionListener(new ActionListener() {
	            public void actionPerformed(ActionEvent e) {
	                actionExit();
	            }
	        });
	        fileMenu.add(fileExitMenuItem);
	        menuBar.add(fileMenu);
	        //setJMenuBar(menuBar);
	        this.add(menuBar);
	        
	        // Set up button panel.
	        JPanel buttonPanel = new JPanel();
	        backButton = new JButton("< Back");
	        backButton.addActionListener(new ActionListener() {
	            public void actionPerformed(ActionEvent e) {
	                actionBack();
	            }
	        });
	        backButton.setEnabled(false);
	        buttonPanel.add(backButton);
	        forwardButton = new JButton("Forward >");
	        forwardButton.addActionListener(new ActionListener() {
	            public void actionPerformed(ActionEvent e) {
	                actionForward();
	            }
	        });
	        forwardButton.setEnabled(false);
	        buttonPanel.add(forwardButton);
	        locationTextField = new JTextField(35);
	        locationTextField.addKeyListener(new KeyAdapter() {
	            public void keyReleased(KeyEvent e) {
	                if (e.getKeyCode() == KeyEvent.VK_ENTER) {
	                    actionGo();
	                }
	            }
	        });
	        buttonPanel.add(locationTextField);
	        JButton goButton = new JButton("GO");
	        goButton.addActionListener(new ActionListener() {
	            public void actionPerformed(ActionEvent e) {
	                actionGo();
	            }
	        });
	        buttonPanel.add(goButton);
			
			//test button and actionlistner. 
        JButton test = new JButton("Test");
        test.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
            	restrictURL();
            }
        });
        buttonPanel.add(test);
		
		 //domain button to view available one's and actionlistner. 
        JButton viewDomains = new JButton("Available domains");
        viewDomains.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                alertDomains();
            }
        });
        buttonPanel.add(viewDomains);
	        
	        // Set up page display.
	        displayEditorPane = new JEditorPane();
	        displayEditorPane.setContentType("text/html");
	        displayEditorPane.setEditable(false);
	        displayEditorPane.addHyperlinkListener(this);
	        /**
	        getContentPane().setLayout(new BorderLayout());
	        getContentPane().add(buttonPanel, BorderLayout.NORTH);
	        getContentPane().add(new JScrollPane(displayEditorPane),
	                BorderLayout.CENTER);
	    }
	    **/
	        this.setLayout(new BorderLayout());
	        this.add(buttonPanel, BorderLayout.NORTH);
	        this.add(new JScrollPane(displayEditorPane),
	                BorderLayout.CENTER);
	    }
	        
	    // Exit this program.
	    private void actionExit() {
	        System.exit(0);
	    }
	    
	    // Go back to the page viewed before the current page.
	    private void actionBack() {
	        URL currentUrl = displayEditorPane.getPage();
	        int pageIndex = pageList.indexOf(currentUrl.toString());
	        try {
	            showPage(
	                    new URL((String) pageList.get(pageIndex - 1)), false);
	        } catch (Exception e) {}
	    }
	    
	    // Go forward to the page viewed after the current page.
	    private void actionForward() {
	        URL currentUrl = displayEditorPane.getPage();
	        int pageIndex = pageList.indexOf(currentUrl.toString());
	        try {
	            showPage(
	                    new URL((String) pageList.get(pageIndex + 1)), false);
	        } catch (Exception e) {}
	    }
	    
	    // Load and show the page specified in the location text field.
	    private void actionGo() {
	        URL verifiedUrl = verifyUrl(locationTextField.getText());
	        if (verifiedUrl != null) {
	            showPage(verifiedUrl, true);
	        } else {
	            showError("Invalid URL");
	        }
	    }
	    
	    // Show dialog box with error message.
	    private void showError(String errorMessage) {
	        JOptionPane.showMessageDialog(this, errorMessage,
	                "Error", JOptionPane.ERROR_MESSAGE);
	    }
	    
	    // Verify URL format.
	    private URL verifyUrl(String url) {
	        // Only allow HTTP URLs.
	        if (!url.toLowerCase().startsWith("http://"))
	            return null;
	        
	        // Verify format of URL.
	        URL verifiedUrl = null;
	        try {
	            verifiedUrl = new URL(url);
	        } catch (Exception e) {
	            return null;
	        }
	        
	        return verifiedUrl;
	    }
	    
	  /* Show the specified page and add it to
	     the page list if specified. */
	    private void showPage(URL pageUrl, boolean addToList) {
	        // Show hour glass cursor while crawling is under way.
	        setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
	        
	        try {
	            // Get URL of page currently being displayed.
	            URL currentUrl = displayEditorPane.getPage();
	            
	            // Load and display specified page.
	            displayEditorPane.setPage(pageUrl);
	            
	            // Get URL of new page being displayed.
	            URL newUrl = displayEditorPane.getPage();
	            
	            // Add page to list if specified.
	            if (addToList) {
	                int listSize = pageList.size();
	                if (listSize > 0) {
	                    int pageIndex =
	                            pageList.indexOf(currentUrl.toString());
	                    if (pageIndex < listSize - 1) {
	                        for (int i = listSize - 1; i > pageIndex; i--) {
	                            pageList.remove(i);
	                        }
	                    }
	                }
	                pageList.add(newUrl.toString());
	            }
	            
	            // Update location text field with URL of current page.
	            locationTextField.setText(newUrl.toString());
	            
	            // Update buttons based on the page being displayed.
	            updateButtons();
	        } catch (Exception e) {
	            // Show error messsage.
	            showError("Unable to load page");
	        } finally {
	            // Return to default cursor.
	            setCursor(Cursor.getDefaultCursor());
	        }
	    }
	    
	  /* Update back and forward buttons based on
	     the page being displayed. */
	    private void updateButtons() {
	        if (pageList.size() < 2) {
	            backButton.setEnabled(false);
	            forwardButton.setEnabled(false);
	        } else {
	            URL currentUrl = displayEditorPane.getPage();
	            int pageIndex = pageList.indexOf(currentUrl.toString());
	            backButton.setEnabled(pageIndex > 0);
	            forwardButton.setEnabled(
	                    pageIndex < (pageList.size() - 1));
	        }
	    }
	    
	    // Handle hyperlink's being clicked.
	    public void hyperlinkUpdate(HyperlinkEvent event) {
	        HyperlinkEvent.EventType eventType = event.getEventType();
	        if (eventType == HyperlinkEvent.EventType.ACTIVATED) {
	            if (event instanceof HTMLFrameHyperlinkEvent) {
	                HTMLFrameHyperlinkEvent linkEvent =
	                        (HTMLFrameHyperlinkEvent) event;
	                HTMLDocument document =
	                        (HTMLDocument) displayEditorPane.getDocument();
	                document.processHTMLFrameHyperlinkEvent(linkEvent);
	            } else {
	                showPage(event.getURL(), true);
	            }
	        }
	    }
		
		
		public void alertDomains(){
    	try
        {
                Scanner scan = new Scanner(new File("C:/Users/Anthony/url/urlFile.txt"));
                domainList.clear();
 
                while(scan.hasNextLine())
                {
                        String[] parts = scan.nextLine().split(".\\) "); //Split the line based on the regular expression.
                        // the "." means any character and is used to represent the number.
                        // the "\\)" means the character ")" and since it is an unusual character it must be preceded by the "\\" in the expression.
 
                        for(String s : parts)//Go through each string on this line
                                if(s.length() != 0)//Only add the string if it is not blank
                                        domainList.add(s);
 
                        domainList.add("\n");//Adds a new line after each line;
                        // "\n" represents a line break
                }
    }
        catch (IOException ec)
        {
                ec.printStackTrace();
    }
        
        //adding elements
        String z = ""; //empty string to store domainList elements
   	 
        for(String a: domainList)
                z += "-"+a; //should keep adding each element to string z.
 
        JOptionPane.showMessageDialog(null,z);//should display
 
    }
    
    //Get the url textfield
    public String getUrlField(){
		return locationTextField.getText();
	}
    
    public void restrictURL(){
    	String url = getUrlField();//get url field
    	
    	for (String avDoms: domainList){//iterate through arraylist that contains url's
    		//url matches arraylist element
    		
    		if (url.equals(avDoms)){
    			
    			actionGo();
    			JOptionPane.showMessageDialog(null,"This URL works!");
    		}
    		else{
    			JOptionPane.showMessageDialog(null,"Sorry you can not access this webpage!",
    					"Access denied", JOptionPane.ERROR_MESSAGE);//should an message denying access
    		}
    		
    	    		
    		
    	}//end of for
    	
    }//end of method	
    	
	    
	   
 
}
[+][-]03/11/09 11:51 AM, ID: 23860848

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About this solution

Zones: Java Programming Language, WebApplications, Apache Web Server
Tags: applet browser signed packages display error java
Sign Up Now!
Solution Provided By: CEHJ
Participating Experts: 1
Solution Grade: A
 
 
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