我有一个带有 Swing GUI 的 Java 程序，我试图让它在 HTML 文件上作为 JApplet 工作，当我在 Eclipse 上测试它时，将它作为 Applet 启动，它可以工作，但是当我使用 javac 编译它时。我得到所有这些文件 Reverser.class、Reverser$1.class、Reverser$2.class、Reverser$3.class 和 Reverser$4.class。它不起作用
<HTML>
<BODY>
<applet code="Reverser.class", height="500" width="800">
</applet>
</BODY>
</HTML>
package Applets;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
public class Reverser extends JApplet
{
/**
*
*/
private static final long serialVersionUID = 1L;
//All Swing elements declared here
private JTextArea userinput, useroutput;
private JScrollPane sbr_userinput, sbr_useroutput;
private JButton runButton, clearButton, homeButton;
private String text; //User input stored here
private String reversed_text; //reversed text stored here
public void init()
{
try {
SwingUtilities.invokeAndWait(new Runnable() {
public void run() {
setContentPane(GUI());
}
});
} catch (Exception e) {
System.err.println("createGUI didn't complete successfully");
}
}
public Container GUI() //Main GUI container here
{
JPanel totalGUI = new JPanel(); //Main panel set here
totalGUI.setLayout(new GridLayout(1, 2, 3, 3)); //Main panel layout set here.
JPanel lPanel = new JPanel(); //Left panel made here
lPanel.setLayout(new GridLayout(2, 1, 3 , 3)); //Left panel layout set here
totalGUI.add(lPanel); // Left Panel added to main panel.
JPanel rPanel = new JPanel(new GridLayout(3, 1, 3 , 3)); //Right panel made here and its layout set here aswell
totalGUI.add(rPanel);//Right panel added to main panel.
//Userinput TextArea made here
userinput = new JTextArea("Welcome to wicky waky text reverser!!!" + "\n" + "Enter your sentence HERE man!!!!");
userinput.setEditable(true); //TextArea set to editable
userinput.setLineWrap(true);
userinput.setWrapStyleWord(true);
lPanel.add(userinput);//TextArea added to left panel
useroutput = new JTextArea(); //useroutput TextArea set here
useroutput.setEditable(false); //TextArea set to not editable
useroutput.setLineWrap(true);
useroutput.setWrapStyleWord(true);
lPanel.add(useroutput); //TextArea added to the left panel
//Scroll bar made here
sbr_userinput = new JScrollPane(userinput, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
sbr_userinput.setPreferredSize(new Dimension(300, 300));
lPanel.add(sbr_userinput); //Scroll bar added to left panel
//Scroll bar made here
sbr_useroutput = new JScrollPane(useroutput, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
sbr_useroutput.setPreferredSize(new Dimension(300, 300));
lPanel.add(sbr_useroutput); //Scroll bar added to the left panel
runButton = new JButton("RUN"); //Button made here
runButton.addActionListener(new ActionListener() //Action Listener made here
{
public void actionPerformed(ActionEvent e)
{
text = userinput.getText(); //Get userinput here
reversed_text = reverser(text); //reverser method called here
try {
userinput.setText("");
userinput.setText("Processed");
Thread.sleep(500); //sleep 0.5 sec
//Print out all output here
useroutput.setText("Your sentence is ==> " + text + "\n" + "\n"
+ "Your reversed sentence is ==> " + reversed_text);
} catch (InterruptedException e1)
{
e1.printStackTrace();
}
System.out.println("working");
}
});
rPanel.add(runButton); //Add button to right panel
clearButton = new JButton("CLEAR"); //New button made here
clearButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
userinput.setText(""); //Set userinput to empty
useroutput.setText(""); //Set useroutput to empty
System.out.println("cleared");
}
});
rPanel.add(clearButton); //Add button to right panel
homeButton = new JButton("HOME"); //New button made here
homeButton.addActionListener(new ActionListener() //Action Listener added here
{
public void actionPerformed(ActionEvent e)
{
}
});
rPanel.add(homeButton); //add button to right panel
totalGUI.setOpaque(true);
return totalGUI; // return totalGUI
}
public static String reverser(String text)
{
//"text" is now put in the object "reverse_text", StringBuffer used so I can use the reverse method.
StringBuffer reverse_text = new StringBuffer(text);
String reversed = reverse_text.reverse().toString(); //reverse and toString methods used.
return reversed; // return revered
}
}
最佳答案
您的小程序中没有包名称。考虑改变
code="Reverser.class"
至
code="Applets.Reverser.class"
并确保类文件位于相对于 HTML 文件的 Applets 子目录中。或者更好的是，创建一个 jar 文件。
您还需要发布浏览器向您提供的错误消息。据我们所知，您可能会遇到版本不兼容的情况。
关于java - JFrame 到 JApplet 在浏览器中不起作用，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/17075393/