我的applet在IDE中运行，但不在浏览器中运行。

Question

我的applet将在IDE中运行，但不会在浏览器中运行。当＆＃34; Next＆＃34;它将打开但似乎没有在html文件中读入jEditorPane1。单击按钮。事实上当＆＃34; Next＆＃34;单击按钮，没有任何反应，但在IDE中运行正常。 这是方法代码：

    private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {                                      
        if(fileNumber > 4){
            fileNumber = 0;
        }

        java.net.URL helpURL = NewJFrame.class.getResource(
                                fileNumbers.get(fileNumber));
        if (helpURL != null) {
    try {
        jEditorPane1.setPage(helpURL);
    } catch (IOException e) {
       System.err.println("Attempted to read a bad URL: " + helpURL);
    }
} else {
    System.err.println("Couldn't find file: file.html");
}
            fileNumber++;
    }                                     

    private void jButton2MouseClicked(java.awt.event.MouseEvent evt) {                                      
        if(problemNumber>3){
            problemNumber = 0;
        }
        fileNumbers = problems.get(problemNumber);
        fileNumber =0;
        java.net.URL helpURL = NewJFrame.class.getResource(
                                fileNumbers.get(fileNumber));
        if (helpURL != null) {
    try {
        jEditorPane1.setPage(helpURL);
    } catch (IOException e) {
        System.err.println("Attempted to read a bad URL: " + helpURL);
    }
} else {
    System.err.println("Couldn't find file: file.html");
}
            fileNumber++;
        problemNumber++;
    }