DOM解析XMl文件

解析的文件Person.xml

<?xml version="1.0" encoding="utf-8"?>
<persons>
    <person id="1" >
        <name>小罗</name>
        <age>21</age>
    </person>
 <person id="2">
     <name>android</name>
  <age>15</age>
 </person>
</persons>

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DOM解析工具类

package com.example.xmlparse;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
public class DomParseUtils {
 public static List<Person> parseXmlByDom(InputStream inputStream)
   throws Exception {
  List<Person> persons = new ArrayList<Person>();
  // 得到一个DocumentBuilderFactory解析工厂类
  DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
  // 得到一个DocumentBuilder解析类
  DocumentBuilder builder = factory.newDocumentBuilder();
  // 接收一个xml的字符串来解析xml,Document代表整个xml文档
  Document document = builder.parse(inputStream);
  // 得到xml文档的根元素节点
  Element personsElement = document.getDocumentElement();
  // 得到标签为person的Node对象的集合NodeList
  NodeList nodeList = personsElement.getElementsByTagName("person");
  for (int i = 0; i < nodeList.getLength(); i++) {
   Person person = new Person();
   // 如果该Node是一个Element
   if (nodeList.item(i).getNodeType() == Document.ELEMENT_NODE) {
    Element personElement = (Element) nodeList.item(i);
    // 得到id的属性值
    String id = personElement.getAttribute("id");
    person.setId(id);
    // 得到person元素下的子元素
    NodeList childNodeList = personElement.getChildNodes();
    for (int j = 0; j < childNodeList.getLength(); j++) {
     if (childNodeList.item(j).getNodeType() == Document.ELEMENT_NODE) {
      // 解析到了person下面的name标签
      if ("name".equals(childNodeList.item(j).getNodeName())) {
       // 解析到了person下面的name标签
       String nameString = childNodeList.item(j)
         .getFirstChild().getNodeValue();
       person.setName(nameString);
      } else if ("age".equals(childNodeList.item(j)
        .getNodeName())) {
       String ageString = childNodeList.item(j)
         .getFirstChild().getNodeValue();
       person.setAge(Integer.parseInt(ageString));
      }
     }
    }
    persons.add(person);
    person = null;
   }
  }
  return persons;
 }
}