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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