Question

我是一名java-beginner，也是编程初学者，我想实现一个DOM-Parser。我的问题：我不知道如何将文件读入解析器。我尝试将IBM-Parser与DOM结合使用。

package domparser;
import org.w3c.dom.*;
import com.ibm.xml.parsers.*;

public class domparser
{
public static void main(String[] args)
{
    domparser MyParser = new domparser();
    MyParser.parse(args[0]);
}

private void parse(String file)
{
    NonValidatingDOMParser parser = new NonValidatingDOMParser();
    try
    {
       parser.parse(file);
       writeDoc(parser.getDocument().getDocumentElement());
    }
    catch (Exception e)
    {
        System.err.println("Fehler: " + e);
    }
}

private void writeDoc(Node node)
{
    short type = node.getNodeType();
    switch (type)
    {
        case Node.ELEMENT_NODE:
        {
            String name = "<" + node.getNodeName();
            NamedNodeMap attrs = node.getAttributes();
            if (attrs != null)
            {
                int length = attrs.getLength();
                for (int i = 0; i < length; i++)
                {
                    Node attr =  attrs.item(i);
                    name += " " + attr.getNodeName();
                    name += "=\"" + attr.getNodeValue() + "\"";
                }
            }
            name += ">";
            System.out.println(name);

            NodeList children = node.getChildNodes();
            if (children != null)
            {
                int length = children.getLength();
                for (int i = 0; i < length; i++)
                    writeDoc(children.item(i));
            }
            break;
        }
        case Node.TEXT_NODE:
        {
            System.out.println(node.getNodeValue());
            break;
        }
    }
}
}

谢谢！

Answer 1

File xmlFile = new File("xmlFiles/type.xml");  
   DocumentBuilderFactory documentFactory = DocumentBuilderFactory  
     .newInstance();  
   DocumentBuilder documentBuilder = documentFactory  
     .newDocumentBuilder();  
   Document doc = documentBuilder.parse(xmlFile);  

   doc.getDocumentElement().normalize();  
   NodeList nodeList = doc.getElementsByTagName("type");  

   System.out.println("Root element :"  + doc.getDocumentElement().getNodeName());

然后你应该循环并打印依赖你的xml文件，这只是一个不完全适合你的例子.... DoucmentBuilderFactory是一种在java中读取XML文件的简单方法。

解析器 - 如何读取文件？

1 个答案: