DOM解析器没有看到子节点 [英] DOM parser doesn't see subnodes

问题描述

我试图用DOM解析器的帮助解析Lingvo xml字典。

问题： DOM解析器没有看到卡的子节点节点（见下面的代码）。

问题？： 如何拉字 c code code code code code code code code code code $ strong>我的代码：

  import entity.Item; 
 import org.w3c.dom.Document; 
 import org.w3c.dom.Element; 
 import org.w3c.dom.Node; 
 import org.w3c.dom.NodeList; 
 import org.xml.sax.SAXException; 
 
 import javax.xml.parsers.DocumentBuilder; 
 import javax.xml.parsers.DocumentBuilderFactory; 
 import javax.xml.parsers.ParserConfigurationException; 
 import java.io.IOException; 
 import java.util.ArrayList; 
 import java.util.List; 
 
 public class DOMParser {
 
 public void parseXMLFile（String xmlFilePath）throws IOException，SAXException {
 Document document = builder.parse（ClassLoader.getSystemResourceAsStream（xmlFilePath）） ; 
列表< Item> itemList = new ArrayList< Item>（）; 
 NodeList nodeList = document.getDocumentElement（）。getChildNodes（）; 
 //通过卡片迭代
 for（int i = 0; i< nodeList.getLength（）; i ++）{
 Node node = nodeList.item（i）; 
 System.out.println（node.getNodeName（））; 
 if（node instanceof Element）{
 if（card.equals（node.getNodeName（）））{
 // HERE node没有任何东西！我的意思是属性，孩子等
} 
} 
} 
} 
} 
  

我的xml：

 <？xml version =1.0encoding =UTF-16？> 
< dictionary formatVersion =5title =User; vocabulary_user1sourceLanguageId =1058destinationLanguageId =1033nextWordId =611targetNamespace =http://www.abbyy.com/TutorDictionary> ; 
< statistics readyMeaningsQuantity =90activeMeaningsQuantity =148learnMeaningsQuantity =374/> 
<卡> 
< word>загальнацікавість< / word> 
< meaning> 
<含义> 
< statistics status =4answers =122914/> 
< translations> 
< word> genaral wondering< / word> 
< / translations> 
< / meaning> 
< / meaning> 
< / card> 
< / dictionary> 
  




解决方案

您可以使用递归方法阅读所有

对于您的xml：

  public static void main（String [] args）throws ParserConfigurationException，
 SAXException，IOException {
 InputStream path = new FileInputStream（dom .XML）; 
 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance（）; 
 DocumentBuilder builder = factory.newDocumentBuilder（）; 
文档文档= builder.parse（path）; 
 traverse（document.getDocumentElement（））; 
 
} 
 
 public static void traverse（Node node）{
 NodeList list = node.getChildNodes（）; （int i = 0; i< list.getLength（）; i ++）{
 Node currentNode = list.item（i）; 
 
 traverse（currentNode）; 
 
} 
 
 if（node.getNodeName（）。equals（word））{
 System.out.println（This  - >+ node.getTextContent（））; 
} 
 
} 
  

给，

 此 - > загальнацікавість
这个 - > genaral想知道
  

I trying to parse Lingvo xml dictionary with help of DOM parser.

Problem: DOM parser doesn't see the subnodes of card node (see code below).

Question?: How to pull word and translation nodes from card node

My code:

import entity.Item;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class DOMParser {

    public void parseXMLFile(String xmlFilePath) throws IOException, SAXException {
        Document document = builder.parse(ClassLoader.getSystemResourceAsStream(xmlFilePath));
        List<Item> itemList = new ArrayList<Item>();
        NodeList nodeList = document.getDocumentElement().getChildNodes();
        //iterates through cards
        for (int i = 0; i < nodeList.getLength(); i++) {
            Node node = nodeList.item(i);
            System.out.println(node.getNodeName());
            if (node instanceof Element) {
                if ("card".equals(node.getNodeName())) {
                    // HERE node hasn't got anything!!! I mean attributes, childs etc.
                } 
            }
        }
    }
}

My xml:

<?xml version="1.0" encoding="UTF-16"?>
<dictionary formatVersion="5" title="User ;vocabulary_user1" sourceLanguageId="1058" destinationLanguageId="1033" nextWordId="611" targetNamespace="http://www.abbyy.com/TutorDictionary">
    <statistics readyMeaningsQuantity="90" activeMeaningsQuantity="148" learnedMeaningsQuantity="374" />
    <card>
        <word>загальна цікавість</word>
        <meanings>
            <meaning>
                <statistics status="4" answered="122914" />
                <translations>
                    <word>genaral wondering</word>
                </translations>
            </meaning>
        </meanings>
    </card>
</dictionary>

解决方案

You can use a recursive approach to read through all your contents without getting into the mess of nested for loops.

For your xml:

public static void main(String[] args) throws ParserConfigurationException,
            SAXException, IOException {
        InputStream path = new FileInputStream("dom.xml");
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        Document document = builder.parse(path);
        traverse(document.getDocumentElement());

    }

    public static void traverse(Node node) {
        NodeList list = node.getChildNodes();
        for (int i = 0; i < list.getLength(); i++) {
            Node currentNode = list.item(i);
            traverse(currentNode);

        }

        if (node.getNodeName().equals("word")) {
            System.out.println("This -> " + node.getTextContent());
        }

    }

Gives,

This -> загальна цікавість
This -> genaral wondering

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