Simple Web Frontend for existing Java app

Hi there!
(sorry for my english at first ;)
I have an existing java app which currently is used via command line. It's a server application which mostly does monitoring outputs and functions you can use in the shell are like starting/stopping the server. For these outputs and for starting/stopping and so on i want to create a simple web frontend which gives me the ability to do this.
What do i need? It would be fine if i do not have to set up a large tomcat server because the program should run out of the box. Of course i want to access the website via the internet (simple login). The whole thing would be about 2-5 simple pages. Best thing would be if i could update the monitoring variables via java script.
Can i use servlets (not much experience with it so far, that's why i ask :) )? What do i need for the webserver? Can i access my data variables from right from the servlet?
Thanks in advance,
kiwaque

If you are familiar with Swing, I would suggest GWT for the Frontend... you can build and debug the Frontend similar to a Swing App, and then compile it to HTML/CSS/Javascript...

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import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
// The Download Manager.
public class DownloadManager extends JFrame
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    private JTextField addTextField;
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    private DownloadsTableModel tableModel;
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    private JButton pauseButton, resumeButton;
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        setTitle("Download Manager");
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        setSize(640, 480);
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        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);
        // Set up add panel.
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        addButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                actionAdd();
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                ListSelectionListener() {
            public void valueChanged(ListSelectionEvent e) {
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                BorderFactory.createTitledBorder("Downloads"));
        downloadsPanel.setLayout(new BorderLayout());
        downloadsPanel.add(new JScrollPane(table),
                BorderLayout.CENTER);
        // Set up buttons panel.
        JPanel buttonsPanel = new JPanel();
        pauseButton = new JButton("Pause");
        pauseButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                actionPause();
        pauseButton.setEnabled(false);
        buttonsPanel.add(pauseButton);
        resumeButton = new JButton("Resume");
        resumeButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                actionResume();
        resumeButton.setEnabled(false);
        buttonsPanel.add(resumeButton);
        cancelButton = new JButton("Cancel");
        cancelButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                actionCancel();
        cancelButton.setEnabled(false);
        buttonsPanel.add(cancelButton);
        clearButton = new JButton("Clear");
        clearButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                actionClear();
        clearButton.setEnabled(false);
        buttonsPanel.add(clearButton);
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        getContentPane().setLayout(new BorderLayout());
        getContentPane().add(addPanel, BorderLayout.NORTH);
        getContentPane().add(downloadsPanel, BorderLayout.CENTER);
        getContentPane().add(buttonsPanel, BorderLayout.SOUTH);
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    private void actionExit() {
        System.exit(0);
    // Add a new download.
    private void actionAdd() {
        URL verifiedUrl = verifyUrl(addTextField.getText());
        if (verifiedUrl != null) {
            tableModel.addDownload(new Download(verifiedUrl));
            addTextField.setText(""); // reset add text field
        } else {
            JOptionPane.showMessageDialog(this,
                    "Invalid Download URL", "Error",
                    JOptionPane.ERROR_MESSAGE);
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    private URL verifyUrl(String url) {
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        if (!url.toLowerCase().startsWith("http://"))
            return null;
        // Verify format of URL.
        URL verifiedUrl = null;
        try {
            verifiedUrl = new URL(url);
        } catch (Exception e) {
            return null;
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        if (verifiedUrl.getFile().length() < 2)
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    // Called when table row selection changes.
    private void tableSelectionChanged() {
    /* Unregister from receiving notifications
       from the last selected download. */
        if (selectedDownload != null)
            selectedDownload.deleteObserver(DownloadManager.this);
    /* If not in the middle of clearing a download,
       set the selected download and register to
       receive notifications from it. */
        if (!clearing) {
            selectedDownload =
                    tableModel.getDownload(table.getSelectedRow());
            selectedDownload.addObserver(DownloadManager.this);
            updateButtons();
    // Pause the selected download.
    private void actionPause() {
        selectedDownload.pause();
        updateButtons();
    // Resume the selected download.
    private void actionResume() {
        selectedDownload.resume();
        updateButtons();
    // Cancel the selected download.
    private void actionCancel() {
        selectedDownload.cancel();
        updateButtons();
    // Clear the selected download.
    private void actionClear() {
        clearing = true;
        tableModel.clearDownload(table.getSelectedRow());
        clearing = false;
        selectedDownload = null;
        updateButtons();
/* Update each button's state based off of the
     currently selected download's status. */
    private void updateButtons() {
        if (selectedDownload != null) {
            int status = selectedDownload.getStatus();
            switch (status) {
                case Download.DOWNLOADING:
                    pauseButton.setEnabled(true);
                    resumeButton.setEnabled(false);
                    cancelButton.setEnabled(true);
                    clearButton.setEnabled(false);
                    break;
                case Download.PAUSED:
                    pauseButton.setEnabled(false);
                    resumeButton.setEnabled(true);
                    cancelButton.setEnabled(true);
                    clearButton.setEnabled(false);
                    break;
                case Download.ERROR:
                    pauseButton.setEnabled(false);
                    resumeButton.setEnabled(true);
                    cancelButton.setEnabled(false);
                    clearButton.setEnabled(true);
                    break;
                default: // COMPLETE or CANCELLED
                    pauseButton.setEnabled(false);
                    resumeButton.setEnabled(false);
                    cancelButton.setEnabled(false);
                    clearButton.setEnabled(true);
        } else {
            // No download is selected in table.
            pauseButton.setEnabled(false);
            resumeButton.setEnabled(false);
            cancelButton.setEnabled(false);
            clearButton.setEnabled(false);
/* Update is called when a Download notifies its
     observers of any changes. */
    public void update(Observable o, Object arg) {
        // Update buttons if the selected download has changed.
        if (selectedDownload != null && selectedDownload.equals(o))
            updateButtons();
    // Run the Download Manager.
    public static void main(String[] args) {
        DownloadManager manager = new DownloadManager();
        manager.show();
This example shows how to create a simple download manager in Java. It contains four classes in foru Java source files:
Download.java: Contains Download class which downloads a file from a URL.
DownloadManager.java: Contains the main class for download manager application.
DownloadsTableModel.java: Contains the class which manages the download table's data.
ProgressRenderer.java: Contains the class which is responsible to render a JProgressBar in a table cell.
The contents of the listed files are written below.
/*__Download.java__*/
import java.io.*;
import java.net.*;
import java.util.*;
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class Download extends Observable implements Runnable {
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    public static final int PAUSED = 1;
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    public int getSize() {
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        return ((float) downloaded / size) * 100;
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    public int getStatus() {
        return status;
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    public void pause() {
        status = PAUSED;
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    public void resume() {
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    public void cancel() {
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        Thread thread = new Thread(this);
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    private String getFileName(URL url) {
        String fileName = url.getFile();
        return fileName.substring(fileName.lastIndexOf('/') + 1);
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    public void run() {
        RandomAccessFile file = null;
        InputStream stream = null;
        try {
            // Open connection to URL.
            HttpURLConnection connection =
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            connection.setRequestProperty("Range",
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            // Connect to server.
            connection.connect();
            // Make sure response code is in the 200 range.
            if (connection.getResponseCode() / 100 != 2) {
                error();
            // Check for valid content length.
            int contentLength = connection.getContentLength();
            if (contentLength < 1) {
                error();
      /* Set the size for this download if it
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            if (size == -1) {
                size = contentLength;
                stateChanged();
            // Open file and seek to the end of it.
            file = new RandomAccessFile(getFileName(url), "rw");
            file.seek(downloaded);
            stream = connection.getInputStream();
            while (status == DOWNLOADING) {
        /* Size buffer according to how much of the
           file is left to download. */
                byte buffer[];
                if (size - downloaded > MAX_BUFFER_SIZE) {
                    buffer = new byte[MAX_BUFFER_SIZE];
                } else {
                    buffer = new byte[size - downloaded];
                // Read from server into buffer.
                int read = stream.read(buffer);
                if (read == -1)
                    break;
                // Write buffer to file.
                file.write(buffer, 0, read);
                downloaded += read;
                stateChanged();
      /* Change status to complete if this point was
         reached because downloading has finished. */
            if (status == DOWNLOADING) {
                status = COMPLETE;
                stateChanged();
        } catch (Exception e) {
            error();
        } finally {
            // Close file.
            if (file != null) {
                try {
                    file.close();
                } catch (Exception e) {}
            // Close connection to server.
            if (stream != null) {
                try {
                    stream.close();
                } catch (Exception e) {}
    // Notify observers that this download's status has changed.
    private void stateChanged() {
        setChanged();
        notifyObservers();
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import java.util.*;
import javax.swing.*;
import javax.swing.table.*;
// This class manages the download table's data.
class DownloadsTableModel extends AbstractTableModel
        implements Observer {
    // These are the names for the table's columns.
    private static final String[] columnNames = {"URL", "Size",
    "Progress", "Status"};
    // These are the classes for each column's values.
    private static final Class[] columnClasses = {String.class,
    String.class, JProgressBar.class, String.class};
    // The table's list of downloads.
    private ArrayList downloadList = new ArrayList();
    // Add a new download to the table.
    public void addDownload(Download download) {
        // Register to be notified when the download changes.
        download.addObserver(this);
        downloadList.add(download);
        // Fire table row insertion notification to table.
        fireTableRowsInserted(getRowCount() - 1, getRowCount() - 1);
    // Get a download for the specified row.
    public Download getDownload(int row) {
        return (Download) downloadList.get(row);
    // Remove a download from the list.
    public void clearDownload(int row) {
        downloadList.remove(row);
        // Fire table row deletion notification to table.
        fireTableRowsDeleted(row, row);
    // Get table's column count.
    public int getColumnCount() {
        return columnNames.length;
    // Get a column's name.
    public String getColumnName(int col) {
        return columnNames[col];
    // Get a column's class.
    public Class getColumnClass(int col) {
        return columnClasses[col];
    // Get table's row count.
    public int getRowCount() {
        return downloadList.size();
    // Get value for a specific row and column combination.
    public Object getValueAt(int row, int col) {
        Download download = (Download) downloadList.get(row);
        switch (col) {
            case 0: // URL
                return download.getUrl();
            case 1: // Size
                int size = download.getSize();
                return (size == -1) ? "" : Integer.toString(size);
            case 2: // Progress
                return new Float(download.getProgress());
            case 3: // Status
                return Download.STATUSES[download.getStatus()];
        return "";
/* Update is called when a Download notifies its
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    public void update(Observable o, Object arg) {
        int index = downloadList.indexOf(o);
        // Fire table row update notification to table.
        fireTableRowsUpdated(index, index);
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import java.awt.*;
import javax.swing.*;
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Thank you for the quick reply! But the solution provided by you, it seems, has still not been able to address my issue. I ran the program at command prompt with your said parameters, but the download still gave an error in the App window.
Also, is there some way of defining these parameters in the source code? I am keen in using NetBeans to run the program.
Cheers!

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Looks like he wants to make a bot that harvests content from websites and/or engages in comment spam on (for example) blogs.
The first is (usually) a violation of the terms of use of a website, the second (and possibly the first) is unethical to say the least.Looks like you jump to conclusion very quickly...Maybe I want to make an application and take over the WORLD!!!

Proxy authentication for existing Java application

Hi all,
I'm trying to run Protege - http://protege.stanford.edu - and it needs to fetch some files from the net, so I have to make it pass my company's proxy, which requires authentication.
I tried to add the following options in the .lax file, but got a 407 / proxy auth error
lax.nl.java.option.additional=-Dhttp.proxySet=true
-Dhttp.proxyHost=YOUR_PROXY_HOST -Dhttp.proxyPort=YOUR_PROXY_PORT
-Dhttp.proxyUser=YOUR_PROXY_USER -Dhttp.proxyPassword=YOUR_PROXY_PASSWOR
The only way I found to make an application accept proxy auth is http://www.javaworld.com/javaworld/javatips/jw-javatip42.html but I'll need to hack my application source code, recompile ...
Is there a way to pass such proxy auth parameters to an existing app without changing any line in its source code ? Or a way to create a wrapper around it that will catch HTTP connections to add proxy parameters to it ?
Thanks a lot for any hint !

-Dhttp.proxyUser=YOUR_PROXY_USER
-Dhttp.proxyPassword=YOUR_PROXY_PASSWORAs far as I can tell these two settings seem to be urban myth, or specific to some non-Sun vendor or external package. They do nothing in the JDK.

How to create a simple web.xml for using servlets

Hello i wanna configure the web.xml that i can use sevlets and beans, but how can i do that?
This is de directorie i have installed my webapp
C:\Tomcat 4.1\webapps\testapp
C:\Tomcat 4.1\webapps\test\WEB-INF\classes (in this dir, I wanna put my beans and servlets, I got one servlet and the name is LogIn.class).
And i wanna request my servlets with the url http://localhost:8080/testapp/servlet/LogIn
How can i create a very basic web.xml with working beans, servlets and session? It is for testing-use only, so the security is not important for me at this moment.
Tnx

under your web-inf
in your web.xml file you must map
the servlets
under the <web-app> tag type
<servlet>
     <servlet-name>LogIn</servlet-name>
     <servlet-class>com.LogIn</servlet-class>
</servlet>
<servlet-mapping>
      <servlet-name>LogIn</servlet-name>
      <url-pattern>/LogIn</url-pattern>
</servlet-mapping>ps: start using some IDE such as NetBeans or Ecclipse
since they will take care of mapping all servlets and Beans
and generate all the necessary files for your web-app

Web Database for existing Sharepoint 2010 List

I would like to create an Access Web Database based on a list that already exists in my SharePoint site. Is this possible?

Hi Adam,
From your description, my understanding is that you want to create an Access database using an existing SharePoint list.
In SharePoint lists, there is a button called "Open with Access". You can synchronize the data in a SharePoint list with Access 2010 by using the Open with Access command in the list ribbon. This command creates an Access table linked to the SharePoint
list, and a supplementary UserInfo table that contains additional information, such as user names, accounts, and e-mail addresses.
You can also link a table to an existing SharePoint List by using the SharePoint List command in the Import & Link group on the External Data tab.
More information about Access and SharePoint, you can refer to the link:
https://support.office.com/en-us/article/Synchronize-a-SharePoint-2010-list-with-Access-2010-975BFB97-C799-4FCE-B7CC-3DB3B397F116
Thanks,
Wendy
TechNet Community Support
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact
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Simple Web Frontend for existing Java app

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