java - 如何访问 JEditorPane 中的小部件？

Question

我正在使用 JEditorPane 来显示 html 文本。如果 html 文件包含

<form action="WORK3.html" method="get">
  <input type="text" value="Enter your name here!" size="25">
</form>

JEdi​​torPane 将在编辑器小部件中放置一个文本字段小部件。我想做的是检索文本字段中的值。如何检索文本字段的文本值或小部件？

Answer 1

HTML 控件被添加到封装在私有内部类 Invalidator extends Container 中的 JEditorPane 中。

因此，您可以获得 JEditorPane 的所有子组件。它们中的每一个都应该是 Invalidator 实例。Invalidator 的唯一子项是编辑组件本身（例如，JTextFlied 用于<input>标记）。

Answer 2

Thanks Stanislav for taking the time to answer. Trying to retrieve the component was too hard for me. I found a way around the problem. I hope this will help someone else. Although I could not find a way to get access to the widget, I can create my own text widget and replace the default one. That way I have control over widget. To do this you have to subclass the HTMLEditorKit.HTMLFactory. In this class, you need to override the

public View create (Element elem_) {
    Document doc = elem_.getDocument();
    Object obj = elem_.getAttributes().
        getAttribute(StyleConstants.NameAttribute);

    HTML.Tag tag = (HTML.Tag) obj;

    if (tag.toString().equals ("input")) {
        // you can replace your widget here if you want
        // i choose to use the default but save the view for
        // my own use later
        ComponentView view = (ComponentView)super.create (elem_);
        // save the component view to where you want to access 
        // later.  you can retrieve the component from the 
        // ComponentView and cast it to back to JTextField
        _editor.saveView (view);

        return (view);
    }

    else {
        return (super.create (elem_);
    }
}

You have to do this at least once for each type of widget that you want to control. It is a pain, but it does the job.

Answer 3

当您在 textPane 中插入组件时，您只需将其从其 Invalidator 类中“解包”即可。

//Loop through the components, maybe looking for some in particular

for (Component cont : myTextPane.getComponents()) {
//Unwrap your component, means take the only one component from the wrapper container
    Component comp = ((Container) cont).getComponent(0);

    //Do your things with your component
    // ...      
}