JAVA读取xml文件

[url]http://blog.youkuaiyun.com/k1113k/article/details/1495807[/url]

Node.getChildNodes()方法是获得所有子节点,你要判断子节点的类型是element还是其他类型,然后再继续往深层找.感觉挺麻烦.

例子1:

package com; 

import org.w3c.dom.*;
import javax.xml.parsers.*;
import java.io.*;

public class Parse{
 //Document可以看作是XML在内存中的一个镜像,那么一旦获取这个Document 就意味着可以通过对
 //内存的操作来实现对XML的操作,首先第一步获取XML相关的Document
  private Document doc=null;

 public void init(String xmlFile) throws Exception{
  //很明显该类是一个单例,先获取产生DocumentBuilder工厂
  //的工厂,在通过这个工厂产生一个DocumentBuilder,
  //DocumentBuilder就是用来产生Document的
  DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance();
  DocumentBuilder db=dbf.newDocumentBuilder();  
  //这个Document就是一个XML文件在内存中的镜像
  doc=db.parse(new File(xmlFile));
 }
 //该方法负责把XML文件的内容显示出来
 public void viewXML(String xmlFile) throws Exception{
  this.init(xmlFile);
  //在xml文件里,只有一个根元素,先把根元素拿出来看看
  Element element=doc.getDocumentElement();
  System.out.println("根元素为:"+element.getTagName());

  NodeList nodeList=doc.getElementsByTagName("dbstore");
  System.out.println("dbstore节点链的长度:"+nodeList.getLength());

  Node fatherNode=nodeList.item(0);
  System.out.println("父节点为:"+fatherNode.getNodeName());

  //把父节点的属性拿出来
  NamedNodeMap attributes=fatherNode.getAttributes();

  for(int i=0;i<attributes.getLength();i++){
   Node attribute=attributes.item(i);
   System.out.println("dbstore的属性名为:"+attribute.getNodeName()+" 相对应的属性值为:"+attribute.getNodeValue());
  }

  NodeList childNodes = fatherNode.getChildNodes();
  System.out.println(childNodes.getLength());
  for(int j=0;j<childNodes.getLength();j++){
   Node childNode=childNodes.item(j);
   //如果这个节点属于Element ,再进行取值
   if(childNode instanceof Element){
    //System.out.println("子节点名为:"+childNode.getNodeName()+"相对应的值为"+childNode.getFirstChild().getNodeValue());
    System.out.println("子节点名为:"+childNode.getNodeName()+"相对应的值为"+childNode.getFirstChild().getNodeValue());
   }
  }

 }

 public static void main(String[] args)throws Exception{
  Parse parse=new Parse();

//我的XML文件
  parse.viewXML("netct.xml");
 }
} 

例子2:

public static List<TableConfig> getTableConfigs(){
		DocumentBuilderFactory factory = null;
		DocumentBuilder db = null;
		Document doc = null;
		List<TableConfig> tableConfigList = new ArrayList<TableConfig>();

		try {
			factory = DocumentBuilderFactory.newInstance();
			db = factory.newDocumentBuilder();
			doc = db.parse(new File(xmlFilePath));


			Element root = doc.getDocumentElement();
			System.out.println(root.getTagName());
			NodeList tableNodeList = doc.getElementsByTagName("table");
			System.out.println(tableNodeList.getLength());
			for(int i=0; i<tableNodeList.getLength(); i++){
				System.out.println(tableNodeList.item(i).getNodeName());
				NodeList tableList = tableNodeList.item(i).getChildNodes();
				System.out.println(tableList.getLength());
				TableConfig tc = new TableConfig();
				for(int j=0; j<tableList.getLength(); j++){
					if(tableList.item(j) instanceof Element){
						String nodeName = tableList.item(j).getNodeName();
						String nodeText = tableList.item(j).getChildNodes().item(0)!=null?tableList.item(j).getChildNodes().item(0).getTextContent():null;
						System.out.println(nodeName+":"+nodeText);
						if("tableName".equalsIgnoreCase(nodeName)) tc.setTableName(nodeText);
						if("primaryKey".equalsIgnoreCase(nodeName)) tc.setPrimaryKey(nodeText);
						if("excludeCols".equalsIgnoreCase(nodeName)) tc.setExcludeCols(nodeText);
						if("parsentColumns".equalsIgnoreCase(nodeName)) tc.setParsentColumns(nodeText);
						if("isInsertOnly".equalsIgnoreCase(nodeName)) tc.setIsInsertOnly(nodeText);
						if("includeIDS".equalsIgnoreCase(nodeName)) tc.setIncludeIDS(nodeText);
						if("excludeIDS".equalsIgnoreCase(nodeName)) tc.setExcludeIDS(nodeText);
					}
				}
				tableConfigList.add(tc);
			}

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


		return null;
	}