如何在Jtree中刷新XML [英] How to refresh XML in Jtree

问题描述

我阅读此处，但是如果xml文件改变了jtree没有重新加载/刷新

如何创建刷新/重新加载Jtree的函数

我尝试编写代码：

I read here , but if the xml file changes the jtree does not reload /refreshes
how to create a function for refresh / reload Jtree
I try to write code :

refreshAction = new AbstractAction("Refresh", IconFactory.getIcon("delete", IconFactory.IconSize.SIZE_16X16)) {
public void actionPerformed(ActionEvent e) {
    XMLTree xmlClass = null;
    ((DefaultTreeModel) xmlClass.getModel()).reload(); 
    System.out.println("Refresh");
}};

但是我收到了错误：java.lang.NullPointerException

but i got the error : java.lang.NullPointerException

推荐答案

我在<弹出中添加了一个新的 Action code> getJPopupForExplorerTree（）。您可能希望从 XMLTree 构造函数中重新计算 xmlFile ;我在下面对它进行了硬编码：

I added a new Action to popup in getJPopupForExplorerTree(). You'll probably want to re-factor xmlFile out of the XMLTree constructor; I've hard coded it for expedience below:

popup.add(new AbstractAction("Reload") {

    public void actionPerformed(ActionEvent e) {
        System.out.println("Reload");
        try {
            root = getRoot("xml.xml");
            setModel(new XMLTreeModel(root));
        } catch (Exception ex) {
            ex.printStackTrace(System.err);
        }
    }
});

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