applet示例 WelcomeApplet.java

2022-11-14 11:27:41

import java.awt.BorderLayout;

import java.awt.EventQueue;

import java.awt.Font;

import java.awt.Graphics;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.net.URL;

import javax.swing.JApplet;

import javax.swing.JButton;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.SwingConstants;

public class WelcomeApplet extends JApplet {

    private static final long serialVersionUID = 1L;

    public void init() {

        EventQueue.invokeLater(new Runnable() {

            @Override

            public void run() {

                setLayout(new BorderLayout());

                JLabel label = new JLabel("Hello "+getParameter("greeting"), SwingConstants.CENTER);

                label.setFont(new Font("Serif", Font.BOLD, 18));

                add(label, BorderLayout.CENTER);

                JPanel panel = new JPanel();

                JButton cayButton = new JButton("cnblogs");

                cayButton.addActionListener(makeAction("http://www.cnblogs.com"));

                panel.add(cayButton);

                add(panel, BorderLayout.SOUTH);

            }

            private ActionListener makeAction(final String string) {

                return new ActionListener() {

                    public void actionPerformed(ActionEvent event) {

                        try {

                            getAppletContext().showDocument(new URL(string));

                        } catch (Exception e) {

                            e.printStackTrace();

                        }

                    }

                };

            }

        });

    }

}

以上的java代码编译成class文件之后，新建一个index.html，内容如下：

<html>

<body>

<applet code="WelcomeApplet.class" width="200" height="200" >

    <param name="greeting" value="applet"/>

</applet>

</body>

</html>

一个带有传参，按钮的applet小程序就可以在网页上运行了，显示效果如下：

参考文献：《Core Java 卷1》第二章

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