windows中双击jar文件即可运行写法

王朝java/jsp·作者佚名  2006-11-24
窄屏简体版  字體: |||超大  

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!

 
 
 
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