Я написал следующий простой апплет, который представляет загрузчик файлов:
import java.io.*;
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class FileChooserDemo extends Applet implements ActionListener {
static private final String newline = "\n";
JButton openButton;
JTextArea log;
JFileChooser fc;
public void init() {
// Create the log first, because the action listeners
// need to refer to it.
log = new JTextArea(5, 20);
log.setMargin(new Insets(5, 5, 5, 5));
log.setEditable(false);
JScrollPane logScrollPane = new JScrollPane(log);
// Create a file chooser
fc = new JFileChooser();
// Uncomment one of the following lines to try a different
// file selection mode. The first allows just directories
// to be selected (and, at least in the Java look and feel,
// shown). The second allows both files and directories
// to be selected. If you leave these lines commented out,
// then the default mode (FILES_ONLY) will be used.
//
fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
// fc.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
// Create the open button. We use the image from the JLF
// Graphics Repository (but we extracted it from the jar).
openButton = new JButton("Open a File...");
openButton.addActionListener(this);
// For layout purposes, put the buttons in a separate panel
JPanel buttonPanel = new JPanel(); // use FlowLayout
buttonPanel.add(openButton);
// Add the buttons and the log to this panel.
add(buttonPanel, BorderLayout.PAGE_START);
add(logScrollPane, BorderLayout.CENTER);
}
public void actionPerformed(ActionEvent e) {
// Handle open button action.
if (e.getSource() == openButton) {
int returnVal = fc.showOpenDialog(FileChooserDemo.this);
if (returnVal == JFileChooser.APPROVE_OPTION) {
File file = fc.getSelectedFile();
// This is where a real application would open the file.
log.append("Opening: " + file.getName() + "." + newline);
} else {
log.append("Open command cancelled by user." + newline);
}
log.setCaretPosition(log.getDocument().getLength());
// Handle save button action.
}
}
}
Он работает нормально, за исключением случаев, когда я пытаюсь включить его в веб-приложение.Я собрал его в JAR и подписал JAR.Ниже приведен файл JSP со ссылкой на апплет:
<%@ page language="java" %>
<html>
<head>
<title>Welcome JSP-Applet Page</title>
</head>
<body>
<jsp:plugin type="applet" code="FileChooserDemo" codebase="./applet" archive="Applet.jar"
width="400" height="400">
<jsp:fallback>
<p>Unable to load applet</p>
</jsp:fallback>
</jsp:plugin>
</body>
</html>
Когда я пытаюсь открыть его из своего браузера.Я получаю следующую ошибку из окна консоли Java:
java.security.AccessControlException: access denied (java.io.FilePermission C:\Users\jatoui\Documents read)
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkRead(Unknown Source)
at java.io.File.exists(Unknown Source)
at java.io.Win32FileSystem.canonicalize(Unknown Source)
at java.io.File.getCanonicalPath(Unknown Source)
at sun.awt.shell.Win32ShellFolderManager2.createShellFolder(Unknown Source)
at sun.awt.shell.Win32ShellFolderManager2.getPersonal(Unknown Source)
at sun.awt.shell.Win32ShellFolderManager2.get(Unknown Source)
at sun.awt.shell.ShellFolder.get(Unknown Source)
at javax.swing.filechooser.FileSystemView.getDefaultDirectory(Unknown Source)
at javax.swing.JFileChooser.setCurrentDirectory(Unknown Source)
at javax.swing.JFileChooser.<init>(Unknown Source)
at javax.swing.JFileChooser.<init>(Unknown Source)
at com.blackducksoftware.proserv.applets.FileChooserDemo.init(FileChooserDemo.java:26)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Exception: java.security.AccessControlException: access denied (java.io.FilePermission C:\Users\jatoui\Documents read)
Есть ли способ преодолеть это ???