xml解析(DOM)

package cn.itcast.other;


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.Node;
import org.w3c.dom.NodeList;


import cn.itcast.domain.Person;
/**
 * 使用Dom解析xml文件
 *
 */
public class DomXMLReader {


public static List<Person> readXML(InputStream inStream) {
List<Person> persons = new ArrayList<Person>();
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
try {
DocumentBuilder builder = factory.newDocumentBuilder();
Document dom = builder.parse(inStream);
Element root = dom.getDocumentElement();
NodeList items = root.getElementsByTagName("person");//查找所有person节点
for (int i = 0; i < items.getLength(); i++) {
Person person = new Person();
//得到第一个person节点
Element personNode = (Element) items.item(i);
//获取person节点的id属性值
person.setId(new Integer(personNode.getAttribute("id")));
//获取person节点下的所有子节点(标签之间的空白节点和name/age元素)
NodeList childsNodes = personNode.getChildNodes();
for (int j = 0; j < childsNodes.getLength(); j++) {
Node node = (Node) childsNodes.item(j);//判断是否为元素类型
if(node.getNodeType() == Node.ELEMENT_NODE){   Element childNode = (Element) node;
                                        //判断是否name元素
   if ("name".equals(childNode.getNodeName())) {
    //获取name元素下Text节点,然后从Text节点获取数据        person.setName(childNode.getFirstChild().getNodeValue());
   } else if ("age".equals(childNode.getNodeName())) {
person.setAge(new Short(childNode.getFirstChild().getNodeValue()));
   }
}
       }
   persons.add(person);
}
inStream.close();
} catch (Exception e) {
e.printStackTrace();
}
return persons;
}

}

package cn.itcast.service;


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.Node;
import org.w3c.dom.NodeList;


import cn.itcast.domain.Person;


/*
 * DOM解析xml
 */
public class DOMPersonService {
public static  List<Person> getPersons(InputStream  is) throws Exception, Exception{//用于获取xml中的数据
List<Person> persons=new ArrayList<Person>();
DocumentBuilderFactory factory= DocumentBuilderFactory.newInstance();
DocumentBuilder builder=factory.newDocumentBuilder();
Document document=builder.parse(is);//一旦调用完成,xml的解析就会完成.以文档树的形式保存
Element element=document.getDocumentElement();//取得根元素
NodeList  personNodes= element.getElementsByTagName("person");//
for (int i = 0; i < personNodes.getLength(); i++) {
Person person=new Person();
Element personElement= (Element) personNodes.item(i);
person.setId( new Integer( personElement.getAttribute("id")));
NodeList personChildds=personElement.getChildNodes();
for (int j = 0; j < personChildds.getLength(); j++) {
if (personChildds.item(j).getNodeType()==Node.ELEMENT_NODE) {//判断当前节点是否为元素类型节点
Element childElement= (Element) personChildds.item(j);
if (childElement.equals("name")) {
//取得第一个子节点
person.setName(childElement.getFirstChild().getNodeValue());
}else if (childElement.equals("age")) {
person.setAge(new Short(childElement.getFirstChild().getNodeValue()));
}
}
}
persons.add(person);
}
return persons;
}
}

<?xml version="1.0" encoding="UTF-8"?>
<persons>
<person id="23">
<name>LiMing</name>
<age>30</age>
</person>
<person id="20">
<name>LiXiangMei</name>
<age>25</age>
</person>
</persons>