jaxp技术解析xml的详细代码

1.使用jaxp实现查询操作

person.xml

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<person>
<p1>
     <name>宝娟</name>
     <age>20</age>
     <school>**大学**</school>
</p1>
<p1>
     <name>鑫鑫</name>
     <age>25</age>
     <school>**大学**</school>
</p1>
</person>

package example4;

//jaxp技术解析xml文件
import java.io.IOException;
import java.util.function.DoubleConsumer;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

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

//类名
class person {

//主方法
   public static void main(String[] args) throws Exception {
       // jaxp技术解析xml文件
       // 1.创建解析器工厂
       //selectAll();
       //selectSome();
       // addSex();
       //modifySex();
       //delSex();
       visitAll();
   }

   // 向某一个标签下添加新的结点
   private static void addSex() throws Exception {
       DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
       DocumentBuilder builder = builderFactory.newDocumentBuilder();
       Document document = builder.parse("src/example4/person.xml");
       // 获取标签
       NodeList list = document.getElementsByTagName("school");
       // 获得具体的一个节点
       Node school1 = list.item(0);
       // 创建一个新的节点
       Element s = document.createElement("sex");
       // 创建一个文本
       Text text1 = document.createTextNode("男");
       // 将新的节添加入某个节点之后
       school1.appendChild(s);
       // 在新节点之下添加文本
       s.appendChild(text1);
       // 经过以上操作之后，没有报错，但没有将具体内容写入xml文件，是因为这一切内容只是在内存中操作，接下来需要写入xml文件
       // 回写xml文件(利用transformer类进行回写操作)
       // 创建TransformerFactory解析工厂
       TransformerFactory transformer = TransformerFactory.newInstance();
       // 创建tansformer解析器
       Transformer former = transformer.newTransformer();
       former.transform(new DOMSource(document), new StreamResult("src/example4/person.xml"));
   }

   // 修改第一个节点<p1>下的sex改为女
   private static void modifySex() throws Exception {
       DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
       DocumentBuilder builder = builderFactory.newDocumentBuilder();
       Document document = builder.parse("src/example4/person.xml");
       NodeList list = document.getElementsByTagName("sex");
       Node name1 = list.item(0);
       //重新设置sex的值
       name1.setTextContent("女");
       // xml回写
       TransformerFactory transformer = TransformerFactory.newInstance();
       Transformer former = transformer.newTransformer();
       former.transform(new DOMSource(document), new StreamResult("src/example4/person.xml"));
   }

   // 删除节点sex
   private static void delSex() throws Exception {
       DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
       DocumentBuilder builder = builderFactory.newDocumentBuilder();
       Document document = builder.parse("src/example4/person.xml");
       NodeList list = document.getElementsByTagName("sex");
       //得到sex节点
       Node name1 = list.item(0);
       //得到sex的父节点
       Node name2 = name1.getParentNode();
       //父节点删除子节点
       name2.removeChild(name1);
       // xml回写
       TransformerFactory transformer = TransformerFactory.newInstance();
       Transformer former = transformer.newTransformer();
       former.transform(new DOMSource(document), new StreamResult("src/example4/person.xml"));
   }

   // 只查询xml中某一结点的值
   private static void selectSome() throws ParserConfigurationException, SAXException, IOException {
       DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
       DocumentBuilder builder = builderFactory.newDocumentBuilder();
       Document document = builder.parse("src/example4/person.xml");
       NodeList list = document.getElementsByTagName("name");
       System.out.println(list.item(0).getTextContent());
   }

　　 // jaxp技术解析xml文件,获取所有的name
   private static void selectAll() throws ParserConfigurationException, SAXException, IOException {
       // 1.创建解析器工厂
       DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
       // 2.创建解析器
       DocumentBuilder builder = builderFactory.newDocumentBuilder();
       // 3.得到document对象
       Document document = builder.parse("src/example4/person.xml");
       // 4.获取想要的结果
       NodeList list = document.getElementsByTagName("name");
       //遍历结点列表
       for (int i = 0; i < list.getLength(); i++) {
           //得到结点
           Node name = list.item(i);
           //得到该节点的内容
           String s = name.getTextContent();
           System.out.println(s);
       }
   }



   //遍历xml中的所有元素名称并打印输出
   private static void visitAll() throws Exception {
       DocumentBuilderFactory builderFactory=DocumentBuilderFactory.newInstance();
       DocumentBuilder builder=builderFactory.newDocumentBuilder();
       Document document=builder.parse("src/example4/person.xml");
       list1(document);

   }
   //递归遍历的方法
   private static void list1(Node node) {
       //得到它的子节点序列
            NodeList list=node.getChildNodes();
            for(int i=0;i<list.getLength();i++) {
               //的到每一个节点
               Node node1=list.item(i);
               //递归调用继续得到它的子节点序列
               list1(node1);
            }
            //判断是元素类型才打印
            if(node.getNodeType()==node.ELEMENT_NODE) {
            System.out.println(node.getNodeName());
            }
   }
}

**以上是jaxp解析xml的提个简单方法介绍，不会的可以查找中文版手册，只需firefox或者google"java platform se 6"即可找到相关方法介绍，建议大家使用eclipse编辑器，每一步有提示，很方便。

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jaxp技术解析xml的详细代码

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