java - ImageIcon 帮助 + 关闭 JOptionPane

Question

我试图在您单击“右键”时显示 PayPal Logo 。不幸的是，显示的只是带有一杯咖啡和一支笔的默认 Java Logo 。

另外，我怎样才能做到一旦您单击“确定”或“取消”，它就会关闭 JOptionPane，目前，当您单击“确定”时什么也没有发生，它会一直给您“确定”/“取消”选项.

rightbutton = new JButton("Right.");
add(rightbutton);
rightbutton.addActionListener(
        new ActionListener(){
            public void actionPerformed(ActionEvent event){
                //what do we want to happen when we
                //click the button
                final ImageIcon icon = new ImageIcon("C:\\Users\\Scr3am\\Desktop\\paypal.jpg");
                JOptionPane.showOptionDialog(null, "Congratulations, you clicked the button.", "Congrats", JOptionPane.DEFAULT_OPTION, JOptionPane.INFORMATION_MESSAGE, null, new Object[] { panel }, icon);
            }
        }
);

完整代码

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;


public class Password extends JFrame {

    JButton leftbutton;
    JButton centerbutton;
    JButton rightbutton;
    FlowLayout layout;
    Container container;




    Password(){
        super("Toolbar");
        layout = new FlowLayout();
        //get bulk of window, so it knows where to put the stuff
        container = getContentPane();
        setLayout(layout);

        //left stuff in here
        leftbutton = new JButton("Left");
        add(leftbutton);
        leftbutton.addActionListener(
                new ActionListener(){
                    public void actionPerformed(ActionEvent event){
                        //what do we want to happen when we
                        //click the button
                        layout.setAlignment(FlowLayout.LEFT);

                    }


                }

        );

        final JPanel panel = new JPanel();
        panel.add(new JButton("OK"));
        panel.add(new JButton("Cancel"));

        //center stuff in here
        centerbutton = new JButton("Center");
        add(centerbutton);
        centerbutton.addActionListener(
                new ActionListener(){
                    public void actionPerformed(ActionEvent event){
                        //what do we want to happen when we
                        //click the button
                        layout.setAlignment(FlowLayout.CENTER);
                        layout.layoutContainer(container);

                    }
                }
        );

        //right stuff in here
        rightbutton = new JButton("Right.");
        add(rightbutton);
        rightbutton.addActionListener(
                new ActionListener(){
                    public void actionPerformed(ActionEvent event){
                        //what do we want to happen when we
                        //click the button
                        try {
                            final ImageIcon icon = new ImageIcon(ImageIO.read(new File("paypalicon.gif")));

                            JOptionPane.showOptionDialog(
                                    null,
                                    "Congratulations, you clicked the button.",
                                    "Congrats",
                                    JOptionPane.OK_OPTION,
                                    JOptionPane.PLAIN_MESSAGE,
                                    icon,
                                    new Object[]{"Okay"},
                                    "Okay");
                        } catch (IOException exp) {
                            exp.printStackTrace();
                        }



                    }
                }
        );
    }


}

错误:

javax.imageio.IIOException: Can't read input file!
at javax.imageio.ImageIO.read(ImageIO.java:1275)
at Password$3.actionPerformed(Password.java:79)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2028)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2351)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.java:6414)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3275)
at java.awt.Component.processEvent(Component.java:6179)
at java.awt.Container.processEvent(Container.java:2084)
at java.awt.Component.dispatchEventImpl(Component.java:4776)
at java.awt.Container.dispatchEventImpl(Container.java:2142)
at java.awt.Component.dispatchEvent(Component.java:4604)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4618)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4279)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4209)
at java.awt.Container.dispatchEventImpl(Container.java:2128)
at java.awt.Window.dispatchEventImpl(Window.java:2492)
at java.awt.Component.dispatchEvent(Component.java:4604)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:717)
at java.awt.EventQueue.access$400(EventQueue.java:82)
at java.awt.EventQueue$2.run(EventQueue.java:676)
at java.awt.EventQueue$2.run(EventQueue.java:674)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:86)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:690)
at java.awt.EventQueue$3.run(EventQueue.java:688)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:86)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:687)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

Answer 1

我认为你的参数设置错误

try {
    final ImageIcon icon = new ImageIcon(ImageIO.read(new File("paypalicon.gif")));

    JOptionPane.showOptionDialog(
            null,
            "Congratulations, you clicked the button.",
            "Congrats",
            JOptionPane.OK_OPTION,
            JOptionPane.PLAIN_MESSAGE,
            icon,
            new Object[]{"Okay"},
            "Okay");
} catch (IOException exp) {
    exp.printStackTrace();
}

JOptionPane 声明 showOptionDialog具有以下参数(按顺序)

• Component，与对话框关联的父组件
• 对象，要显示的消息
• 字符串，对话框标题
• int，选项类型(如果未指定)，例如 JOptionPane.OKAY_CANCEL_OPTION
• int，消息类型，例如JOptionPane.INFORMATION_MESSAGE，可以定义对话框将使用的图标
• Icon，要在对话框上显示的图标
• Object[]，可供用户使用的选项(按钮)
• Object，获得焦点的初始选项

你好像路过了...

• null 作为父级，好的。
• “恭喜，您点击了按钮。”，好的
• “恭喜”，好的
• JOptionPane.DEFAULT_OPTION，好的
• JOptionPane.INFORMATION_MESSAGE 可能没问题，我会使用 JOptionPane.PLAIN_MESSAGE，但这就是我
• null...没有图标？
• new Object[] { panel }，不确定这是否可以，但至少它在正确的位置
• 图标...这甚至不是您传递的选项参数中的值...认为这是遗漏的地方。

按钮的问题归结为它们与对话框断开连接。对话框绝对无法知道按钮是否被单击，您必须通过某种 ActionListener 提供该功能...说实话，它只是传递 String 值作为 options 参数，并让 JOptionPane 将它们呈现为按钮，因为它将处理关闭对话框，否则它会变得非常困惑，非常快...