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windows中双击jar文件即可运行写法

 2005-10-07 16:29:27 来源:WEB开发网   
核心提示:下面通过一个例子来说明,这个例子包括2个java文件和一个mf文件:文件1:Frame1.javapackage testjar;import java.awt.*;import java.awt.event.*;import javax.swing.*;public class Frame1 extends JFra

下面通过一个例子来说明,这个例子包括2个java文件和一个mf文件:

文件1:Frame1.java

package testjar;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Frame1 extends JFrame {
  JPanel contentPane;
  BorderLayout borderLayout1 = new BorderLayout();

  //Construct the frame
  public Frame1() {
   enableEvents(AWTEvent.WINDOW_EVENT_MASK);
   try {
    jbInit();
   }
   catch(Exception e) {
    e.PRintStackTrace();
   }
  }

  //Component initialization
  private void jbInit() throws Exception  {
   contentPane = (JPanel) this.getContentPane();
   contentPane.setLayout(borderLayout1);
   this.setSize(new Dimension(400, 300));
   this.setTitle("Frame Title");
  }

  //Overridden so we can exit when window is closed
  protected void processWindowEvent(WindowEvent e) {
   super.processWindowEvent(e);
   if (e.getID() == WindowEvent.WINDOW_CLOSING) {
    System.exit(0);
   }
  }
}

文件2:App.java

package testjar;

import javax.swing.UIManager;
import java.awt.*;

public class App {
  boolean packFrame = false;

  //Construct the application
  public App() {
   Frame1 frame = new Frame1();
   //Validate frames that have preset sizes
   //Pack frames that have useful preferred size info, e.g. from their layout
   if (packFrame) {
    frame.pack();
   }
   else {
    frame.validate();
   }
   //Center the window
   Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
   Dimension frameSize = frame.getSize();
   if (frameSize.height > screenSize.height) {
    frameSize.height = screenSize.height;
   }
   if (frameSize.width > screenSize.width) {
    frameSize.width = screenSize.width;
   }
   frame.setLocation((screenSize.width - frameSize.width) / 2, (screenSize.height - frameSize.height) / 2);
   frame.setVisible(true);
  }

  //Main method
  public static void main(String[] args) {
   try {
    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
   }
   catch(Exception e) {
    e.printStackTrace();
   }
   new App();
  }
}

文件3:manif.mf

Main-Class: testjar.App

复制上述的三个文件到一个目录中,用命令行进入这个目录并执行 javac -d . *.java,此时会编译生成class文件,然后执行 jar -cvfm te.jar manif.mf  testjar,应该回生成一个名为te.jar的jar文件,双击它,就可以看到效果了!

Tags:windows jar 文件

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