解析XML文件并且进行增删改查操作

phoneinfo.xml文件：

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<phoneinfo>
<brand id="0" name="小米">
<type name="MI5"/>
<type name="NOTE"/>
<type name="MI5S"/>
</brand>
<brand id="1" name="华为">
<type name="M1"/>
<type name="荣耀8"/>
<type name="荣耀8puls"/>
</brand>
<brand id="2" name="苹果">
<type name="iphone7"/>
<type name="iphone6"/>
</brand>
</phoneinfo>

解析XML文件，并且增删改查操作：

package com.hfxt;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
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.xml.sax.SAXException;
//解析XMl文件(并增、删、改、查、操作)
public class DomXml {
private Document document;

public static void main(String[] args){
DomXml dx = new DomXml();
dx.getDom();
//dx.addEle();
dx.deleteEle();
dx.updateEle();
dx.showInfo();
}

//获取DOM树
public void getDom(){
try {
//获取XML解析器
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
//创建解析器工场
DocumentBuilder builder = factory.newDocumentBuilder();
//解析xml文件
document = builder.parse("phoneinfo.xml");
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}

//添加手机信息
public void addEle(){
//添加节点
Element brand = document.createElement("brand");
//添加属性并且赋值
brand.setAttribute("name","苹果");
//添加子节点
Element type = document.createElement("type");
Element type1 = document.createElement("type");
//添加属性并且赋值
type.setAttribute("name","iphone7");
type1.setAttribute("name","iphone6");
//将type作为brand的子节点
brand.appendChild(type);
brand.appendChild(type1);
//将phoneinfo作为头标签元素
document.getElementsByTagName("phoneinfo").item(0).appendChild(brand);
saveEle("phoneinfo.xml");
}

//保存信息到XML文件中(用转换器、输出流)
public void saveEle(String path){
//创建转换器工厂
TransformerFactory factory = TransformerFactory.newInstance();
//指定格式(格式缩进)
factory.setAttribute("indent-number",4);
try {
//获取转换器
Transformer transFormer = factory.newTransformer();
//是否缩进格式
transFormer.setOutputProperty(OutputKeys.INDENT,"Yes");
//将DOM文件写入source里
DOMSource source = new DOMSource(document);
//指定路径
OutputStream os = new FileOutputStream(path);
StreamResult result = new StreamResult(new OutputStreamWriter(os,"UTF-8"));

//将文件输入到指定位置
transFormer.transform(source,result);
} catch (TransformerConfigurationException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (TransformerException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}

//删除信息
public void deleteEle(){
//获取节点集合
NodeList brand = document.getElementsByTagName("brand");
//遍历集合
for(int i=0;i<brand.getLength();i++){
Node brandNode = brand.item(i);
Element eleBrand = (Element)brandNode;
if(eleBrand.getAttribute("name").equals("苹果")){
eleBrand.getParentNode().removeChild(eleBrand);
}
}
saveEle("phoneinfo.xml");
}

//修改XML文件信息
public void updateEle(){
//获取节点的集合
NodeList brand = document.getElementsByTagName("brand");
//遍历节点集合
for(int i=0;i<brand.getLength();i++){
Node brandNode =brand.item(i);
//将节点转换成元素
Element eleBrand = (Element)brandNode;
//增加ID的属性
eleBrand.setAttribute("id",i+"");
}
//保存信息
saveEle("phoneinfo.xml");
}

//获取手机信息
public void showInfo(){
//获取节点的集合
NodeList brand = document.getElementsByTagName("brand");
//遍历节点的集合获取每一个节点
for(int i=0;i<brand.getLength();i++){
Node nodeBrand = brand.item(i);
//将节点转换成元素
Element eleBrand = (Element)nodeBrand;
//通过name属性获取对应的值
System.out.println(eleBrand.getAttribute("name"));

//获取子节点集合
NodeList type = nodeBrand.getChildNodes();
//遍历子节点结合
for(int j=0;j<type.getLength();j++){
Node nodeType = type.item(j);
//判断是否为节点
if(nodeType.getNodeType() == Node.ELEMENT_NODE){
Element eleType = (Element)nodeType;
System.out.println("\t"+eleType.getAttribute("name"));
}
}
}
}

}