java通过applet调用类

3 月，3 周 Questions & Answers 1144

你好，我是小应用程序的新手，我需要帮助理解一些东西

因此，我在eclipse中创建了一个小程序，在单击小程序上的按钮时调用另一个类文件及其方法

public class mainApplet extends JApplet {
private JTextField textField;
private JTextField textField_1;
private JTextField textField_2;

private int x;
private int y;
private int result;
public mainApplet() {

    textField = new JTextField();
    textField.setColumns(10);
    textField_1 = new JTextField();
    textField_1.setColumns(10);
    textField_2 = new JTextField();
    textField_2.setColumns(10);

    JButton btnCalculate = new JButton("Calculate");
    final JCheckBox ChckbxADD= new JCheckBox("Add");
    final JCheckBox chckbxLaunch = new JCheckBox("Launch  Browser");

    GroupLayout groupLayout = new GroupLayout(getContentPane());
    groupLayout.setHorizontalGroup(
        groupLayout.createParallelGroup(Alignment.LEADING)
            .addGroup(groupLayout.createSequentialGroup()
                .addGroup(groupLayout.createParallelGroup(Alignment.LEADING)
                    .addGroup(groupLayout.createSequentialGroup()
                        .addGap(49)
                        .addComponent(textField, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
                        .addGap(26)
                        .addComponent(textField_1, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
                    .addGroup(groupLayout.createSequentialGroup()
                        .addGap(89)
                        .addGroup(groupLayout.createParallelGroup(Alignment.TRAILING)
                            .addComponent(btnCalculate)
                            .addComponent(textField_2, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
                            .addGroup(groupLayout.createParallelGroup(Alignment.LEADING)
                                .addComponent(ChckbxADD)
                                .addComponent(chckbxLaunch)))))
                .addContainerGap(203, Short.MAX_VALUE))
    );
    groupLayout.setVerticalGroup(
        groupLayout.createParallelGroup(Alignment.LEADING)
            .addGroup(groupLayout.createSequentialGroup()
                .addGap(48)
                .addGroup(groupLayout.createParallelGroup(Alignment.BASELINE)
                    .addComponent(textField, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
                    .addComponent(textField_1, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE))
                .addGap(18)
                .addComponent(ChckbxADD)
                .addGap(3)
                .addComponent(chckbxLaunch)
                .addGap(20)
                .addComponent(btnCalculate)
                .addGap(28)
                .addComponent(textField_2, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
                .addContainerGap(74, Short.MAX_VALUE))
    );
    getContentPane().setLayout(groupLayout);


    btnCalculate.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {
            Functions func = new Functions();


            if (ChckbxADD.isSelected()){
                x=Integer.parseInt(textField.getText());
                y=Integer.parseInt(textField_1.getText());
                result=func.addition(x, y);
                textField_2.setText(String.valueOf(result));

            }
            if(chckbxLaunch.isSelected()){
                func.Launch();

            }

        }
    });

}

}

当我通过eclipse运行它时，它就可以工作了。我将类文件与applet文件一起导出到一个jar（Calc.jar）中。然后，我使用以下简单的html调用小程序。此html是一个本地文件

   <HTML>
     <HEAD>
        </HEAD>
     <BODY>
     <div >
     <APPLET CODE="mainApplet.class" archive="Calc.jar" WIDTH="800" HEIGHT="500">
     </APPLET>
     </div>
    </BODY>
     </HTML>

小程序位于MainApplet类中，它调用函数类

   public class Functions {

        public void Launch(){

WebDriver driver= new FirefoxDriver();
driver.get("http://www.google.com");


}

public int addition(int x, int y){

    int result;
    result=x + y;
    return result;

}

}

当小程序在浏览器中启动且选中“启动浏览器”复选框并单击按钮时，应打开firefox窗口并启动google。通用域名格式。在eclipse中，这种情况完全可以发生。但是，当小程序嵌入本地站点时，选中“启动浏览器”复选框并单击按钮时，不会发生任何事情。我有另一个用于applet（addition）的函数，它按设计工作。用户可以在两个jtextfield中输入两个数字，并选中“添加”复选框，单击按钮时，结果显示在小程序的另一个jtextfield上。这很好，但另一个函数不起作用

更新：

以下是控制台中的例外情况：

Exception in thread "AWT-EventQueue-2" java.lang.NoClassDefFoundError: org/openqa/selenium/WebDriver
    at mainApplet$1.actionPerformed(mainApplet.java:75)
    at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
    at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
    at java.awt.Component.processMouseEvent(Unknown Source)
    at javax.swing.JComponent.processMouseEvent(Unknown Source)
    at java.awt.Component.processEvent(Unknown Source)
    at java.awt.Container.processEvent(Unknown Source)
    at java.awt.Component.dispatchEventImpl(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
    at java.awt.EventQueue.access$200(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue$4.run(Unknown Source)
    at java.awt.EventQueue$4.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.openqa.selenium.WebDriver
    at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 36 more

提前感谢您的帮助

共 (1) 个答案

# 1 楼答案
What is reported in the Java Console when run in a web page? I expect it will show something related to security - e.g. an AccessControlException.

我在控制台中遇到以下错误：
```
Exception in thread "AWT-EventQueue-2" java.lang.NoClassDefFoundError:
```
更改：
```
archive="Calc.jar" 
```
致：
```
archive="Calc.jar,x.jar" 
```
。。其中x.jar是包含WebDriver类的Jar的名称

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java通过applet调用类

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