Java 从不同位置执行时,无法从jar文件打开外部文件
我有一个带有“帮助”按钮的java应用程序。单击该按钮时,它将在默认浏览器中打开index.htmlJava 从不同位置执行时,无法从jar文件打开外部文件,java,swing,jar,Java,Swing,Jar,我有一个带有“帮助”按钮的java应用程序。单击该按钮时,它将在默认浏览器中打开index.html import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.File; import java.io.IOException; import java.util.logging.Level; import java.util.logging.Logger; import javax
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;
public class help {
private static JButton jButton1;
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame("HelloWorldSwing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Add button
jButton1 = new javax.swing.JButton("help");
// button action
jButton1.addActionListener(
new ActionListener()
{
@Override
public void actionPerformed( ActionEvent ae )
{
try {
File directory = new File (".");
File html= new File("helpFile"+File.separator+"index.html");
java.awt.Desktop.getDesktop().open(html);
}
catch (IOException ex) {Logger.getLogger(help.class.getName()).log(Level.SEVERE, null, ex);}
}
});
frame.getContentPane().add(jButton1);
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
当我执行时,它工作正常
java help
我将它打包到一个.jar文件中,它也可以工作
java -jar a.jar
但是,如果我离开包含.jar文件的目录,它在单击按钮时找不到index.html
终端输出
[world@localhost Help]$ cd ..
[world@localhost Desktop]$ java -jar Help/a.jar
Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: The file: helpFile/index.html doesn't exist.
at java.awt.Desktop.checkFileValidation(Desktop.java:209)
at java.awt.Desktop.open(Desktop.java:270)
at help$1.actionPerformed(help.java:36)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2012)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2335)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:404)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:253)
at java.awt.Component.processMouseEvent(Component.java:6203)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
at java.awt.Component.processEvent(Component.java:5968)
at java.awt.Container.processEvent(Container.java:2105)
at java.awt.Component.dispatchEventImpl(Component.java:4564)
at java.awt.Container.dispatchEventImpl(Container.java:2163)
at java.awt.Component.dispatchEvent(Component.java:4390)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4461)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4125)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4055)
at java.awt.Container.dispatchEventImpl(Container.java:2149)
at java.awt.Window.dispatchEventImpl(Window.java:2478)
at java.awt.Component.dispatchEvent(Component.java:4390)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:649)
at java.awt.EventQueue.access$000(EventQueue.java:96)
at java.awt.EventQueue$1.run(EventQueue.java:608)
at java.awt.EventQueue$1.run(EventQueue.java:606)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:116)
at java.awt.EventQueue$2.run(EventQueue.java:622)
at java.awt.EventQueue$2.run(EventQueue.java:620)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:619)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)
您是否尝试过
desktop.browse(uri)代码>它对我有效这是因为您在程序中使用了相对文件路径:
helpfile/index.html
方法:在当前目录的目录helpfile
中查找index.html
文件
使用绝对文件路径,或使用启动脚本,确保程序始终从同一目录执行
旁注:您应该始终将类放在一个包中,而不要将它们放在默认包中。我同意JB Niset,您的路径不正确,请尝试绝对路径进行测试。不幸的是,我还需要打开pdf帮助文件。我将代码的第27行修改为file html=new file(directory.getAbsolutePath()+file.separator+“helpFile”+File.separator+“index.html”),仍然存在同样的问题,这不会改变你的战略。您仍然打开一个文件,其路径与当前目录(“
)相关。显然,当您更改当前目录时,文件路径也会更改。使用类似于filehtml=newfile(“c:/foo/bar/helpFile/index.html”)
的东西,但是我的程序应该在不同的平台上运行