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我在netbeans网站（因服务器问题而脱机）上创建一个教程，以创建一个读取XML并在其上输出一些信息的操作。一切都很好，但行动不允许我在某些XML文件上调用它，并且我没有有用的资源来呼吁帮助解决这个问题。例如，当我运行程序时，它允许我在清单文件（甚至不是xml，并且相应地出错）上调用操作，但不在.xml文件上。以下代码可能是我从教程中更改的罪魁祸首。我想它会使“显示XML”消息始终处于启用状态，但它仍然在xml文件上被禁用。Netbeans平台操作困难
@ActionReferences({
@ActionReference(path = "Editors/Popup", position = 1100)
})
这里是我的SSCCE（原文如此）：
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package com.versifit.udl.xml;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.io.IOException;
import java.io.InputStream;
import org.openide.awt.ActionID;
import org.openide.awt.ActionReference;
import org.openide.awt.ActionReferences;
import org.openide.awt.ActionRegistration;
import org.openide.cookies.EditorCookie;
import org.openide.util.Exceptions;
import org.openide.util.NbBundle;
import org.openide.util.NbBundle.Messages;
import org.openide.windows.IOProvider;
import org.openide.windows.InputOutput;
import org.openide.xml.XMLUtil;
import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
@ActionID(category = "Edit",
id = "com.versifit.udl.xml.ShowXMLStructureAction")
@ActionRegistration(displayName = "#CTL_ShowXMLStructureAction")
@ActionReferences({
@ActionReference(path = "Editors/Popup", position = 1100)
})
@Messages("CTL_ShowXMLStructureAction=Show Xml Structure")
public final class ShowXMLStructureAction implements ActionListener {
private final EditorCookie context;
public ShowXMLStructureAction(EditorCookie context) {
this.context = context;
}
public void actionPerformed(ActionEvent ev) {
EditorCookie editorCookie = context;
//Get the tab name from the Bundle.prop file:
String tabName = NbBundle.getMessage(ShowXMLStructureAction.class, "LBL_tabName");
InputOutput io = IOProvider.getDefault().getIO(tabName, false);
io.select(); //"XML Structure" tab is selected
try {
//Get the InputStream from the EditorCookie:
InputStream is = ((org.openide.text.CloneableEditorSupport) editorCookie).getInputStream();
//Use the NetBeans org.openide.xml.XMLUtil class to create a org.w3c.dom.Document:
//"XML Structure" tab is created in Output Window for writing the list of tags:
Document doc = XMLUtil.parse(new InputSource(is),true,true,null,null);
//Create a list of nodes, for all hte elements:
NodeList list = doc.getElementsByTagName("*");
//Iterate through the list:
for (int i = 0; i < list.getLength(); i++) {
//For each node in the list, create a org.w3c.dom.Node:
org.w3c.dom.Node mainNode = list.item(i);
//Create a map for all the attributes of the org.w3c.dom.Node:
NamedNodeMap map = mainNode.getAttributes();
//Get the name of the node:
String nodeName = mainNode.getNodeName();
//Create a StringBuilder for the Attributes of the Node:
StringBuilder attrBuilder = new StringBuilder();
//Iterate through the map of attributes:
for (int j = 0; j < map.getLength(); j++) {
//Each iteration, create a new Node:
org.w3c.dom.Node attrNode = map.item(j);
//Get the name of the current Attribute:
String attrName = attrNode.getNodeName();
//Add the current Attribute to the StringBuilder:
attrBuilder.append("*").append(attrName).append(" ");
}
//Print the element and its attributes to the Output window:
io.getOut().println("ELEMENT: " + nodeName +
" --> ATTRIBUTES: " + attrBuilder.toString());
}
//Close the InputStream:
is.close();
} catch (SAXException ex) {
Exceptions.printStackTrace(ex);
} catch (IOException ex) {
Exceptions.printStackTrace(ex);
}
}
}