java - JAVA中未定义方法getTagValue()

我是Java新手。我看到了许多有关读取XML的示例，当我尝试将其复制到代码中时，出现错误，即getTagValue未定义。
我正在使用Eclipse JRE 1.6。

据我了解，该方法（getTagValue）存在吗？

这是错误：

Exception in thread "main" java.lang.Error: Unresolved compilation problems:

The method getTagValue(String, Element) is undefined for the type WriteXMLFile
The method getTagValue(String, Element) is undefined for the type WriteXMLFile
The method getTagValue(String, Element) is undefined for the type WriteXMLFile
The method getTagValue(String, Element) is undefined for the type WriteXMLFile

这是代码：

import java.io.File;
import java.io.ObjectInputStream.GetField;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;



public class WriteXMLFile
  {

public static void main(String argv[])
{

  try {

    DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
    DocumentBuilder docBuilder = docFactory.newDocumentBuilder();

    // root elements
    Document doc = docBuilder.newDocument();
    Element rootElement = doc.createElement("company");
    doc.appendChild(rootElement);

    // staff elements
    Element staff = doc.createElement("Staff");
    rootElement.appendChild(staff);

    // set attribute to staff element
    Attr attr = doc.createAttribute("id");
    attr.setValue("1");
    staff.setAttributeNode(attr);

    // shorten way
    // staff.setAttribute("id", "1");

    // firstname elements
    Element firstname = doc.createElement("firstname");
    firstname.appendChild(doc.createTextNode("yong"));
    staff.appendChild(firstname);

    // lastname elements
    Element lastname = doc.createElement("lastname");
    lastname.appendChild(doc.createTextNode("mook kim"));
    staff.appendChild(lastname);

    // nickname elements
    Element nickname = doc.createElement("nickname");
    nickname.appendChild(doc.createTextNode("mkyong"));
    staff.appendChild(nickname);

    // salary elements
    Element salary = doc.createElement("salary");
    salary.appendChild(doc.createTextNode("100000"));
    staff.appendChild(salary);

    // write the content into xml file
    TransformerFactory transformerFactory = TransformerFactory.newInstance();
    Transformer transformer = transformerFactory.newTransformer();
    DOMSource source = new DOMSource(doc);
    StreamResult result = new StreamResult(new File("file.xml"));

    // Output to console for testing
    // StreamResult result = new StreamResult(System.out);

    transformer.transform(source, result);

    System.out.println("File saved!");

  }
  catch (ParserConfigurationException pce)
  {
    pce.printStackTrace();
  }
  catch (TransformerException tfe)
  {
    tfe.printStackTrace();
  }

  /////  read
  try {

        File fXmlFile = new File("c:\\file.xml");
        DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
        Document doc = dBuilder.parse(fXmlFile);
        doc.getDocumentElement().normalize();

        System.out.println("Root element :" + doc.getDocumentElement().getNodeName());
        NodeList nList = doc.getElementsByTagName("staff");
        System.out.println("-----------------------");

        for (int temp = 0; temp < nList.getLength(); temp++) {

           Node nNode = nList.item(temp);
           if (nNode.getNodeType() == Node.ELEMENT_NODE) {

              Element eElement = (Element) nNode;

              System.out.println("First Name : " + getTagValue("firstname", eElement));
              System.out.println("Last Name : " + getTagValue("lastname", eElement));
              System.out.println("Nick Name : " + getTagValue("nickname", eElement));
              System.out.println("Salary : " + getTagValue("salary", eElement));

           }
        }
      } catch (Exception e) {
        e.printStackTrace();
      }

}

}

最佳答案

该方法需要包含在类文件中

private String getTagValue(String sTag, Element eElement) {
    NodeList nlList = eElement.getElementsByTagName(sTag).item(0)
            .getChildNodes();

    Node nValue = (Node) nlList.item(0);

    return nValue.getNodeValue();
}

关于java - JAVA中未定义方法getTagValue()，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/10191676/