XML的增删改查代码,Java代码库,德仔网

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【Java】 XML的增删改查
作者:qddxpj / 发布于2014/11/7/ 403

	package XMLcrud;
	
	import java.io.FileOutputStream;
	import java.io.InputStream;
	import java.util.ArrayList;
	import java.util.List;
	
	import org.dom4j.Document;
	import org.dom4j.Element;
	import org.dom4j.io.OutputFormat;
	import org.dom4j.io.SAXReader;
	import org.dom4j.io.XMLWriter;
	
	public class XMLUtil {
	 private static String fileURL="/user.xml";
	
	 /**
	 * 获取XML中所有的用户信息
	 * @return
	 */
	 public static List<User> getAllUser(){
	 Document document=getDocument();
	 Element rootElement=document.getRootElement();
	
	 List<Element> userElements=rootElement.elements();
	 List<User> users=new ArrayList<User>();
	 for (Element userElement : userElements) {
	 User user=new User();
	 user.setId(userElement.attributeValue("id"));
	 user.setName(userElement.element("name").getTextTrim());
	 user.setAge(userElement.element("age").getTextTrim());
	 users.add(user);
	 }
	 return users;
	 }
	
	 /**
	 * 向XML文件中添加一个user
	 * @param user
	 */
	 public static void add(User user){
	 Document document=getDocument();
	 Element rootElement=document.getRootElement();
	
	 Element userElement=rootElement.addElement("user");
	 userElement.addAttribute("id",getMaxId()+1+"");
	 Element nameElement=userElement.addElement("name");
	 Element ageElement=userElement.addElement("age");
	 nameElement.setText(user.getName());
	 ageElement.setText(user.getAge());
	
	 write2XML(document);
	 }
	 /**
	 * 根据id删除user
	 * @param id
	 */
	 public static void deleteById(String id){
	 Document document=getDocument();
	 Element rootElement=document.getRootElement();
	
	 List<Element> userElements=rootElement.elements("user");
	 for (Element userElement : userElements) {
	 if(userElement.attributeValue("id").equals(id)){
	 System.out.println("开始删除.....");
	 rootElement.remove(userElement);
	 System.out.println("删除结束.....");
	 }
	 }
	 write2XML(document);
	 }
	 /**
	 * 修改user信息
	 * @param user
	 */
	 public static void update(User user){
	 Document document=getDocument();
	 Element rootElement=document.getRootElement();
	
	 List<Element> userElements=rootElement.elements();
	 for (Element userElement : userElements) {
	 if(userElement.attributeValue("id").equals(user.getId())){
	 List<Element> elements=userElement.elements();
	 userElement.element("name").setText(user.getName());
	 userElement.element("age").setText(user.getAge());
	 }
	 }
	 write2XML(document);
	 }
	
	 /**
	 * 获取根节点
	 * @return rootElement
	 */
	 public static Document getDocument(){
	 try {
	 SAXReader saxReader=new SAXReader();
	 InputStream in=OperateXML.class.getResourceAsStream("/user.xml");
	 Document document=saxReader.read(in);
	
	 return document;
	 } catch (Exception e) {
	 e.printStackTrace();
	 throw new RuntimeException(e);
	 }
	 }
	 /**
	 * 把内容写到XML文件中
	 * @param document
	 */
	 public static void write2XML(Document document){
	 try {
	 OutputFormat format=new OutputFormat(" ", true, "utf-8");
	 format.setTrimText(true);
	 XMLWriter writer = new XMLWriter(format);
	 writer.setOutputStream(new FileOutputStream("src"+fileURL));
	 writer.write(document);
	 writer.close();
	 } catch (Exception e) {
	 e.printStackTrace();
	 throw new RuntimeException(e);
	 }
	 }
	 /**
	 * 获取xml文件中userId的最大值
	 * @return int
	 */
	 public static int getMaxId(){
	 int maxId=0;
	 Document document=getDocument();
	 Element rootElement=document.getRootElement();
	 List<Element> userElements=rootElement.elements();
	 for (Element element : userElements) {
	 int id=Integer.valueOf(element.attributeValue("id"));
	 if(maxId<id){
	 maxId=id;
	 }
	 }
	 return maxId;
	 }
	}

	

	

	package XMLcrud;
	
	public class User {
	 private String id;
	 private String name;
	 private String age;
	 public String getId() {
	 return id;
	 }
	 public void setId(String id) {
	 this.id = id;
	 }
	 public String getName() {
	 return name;
	 }
	 public void setName(String name) {
	 this.name = name;
	 }
	
	 public String getAge() {
	 return age;
	 }
	 public void setAge(String age) {
	 this.age = age;
	 }
	 @Override
	 public String toString() {
	 return "User [id=" + id + ", name=" + name + ", age=" + age + "]";
	 }
	
	}

	

	<?xml version="1.0" encoding="utf-8"?>
	
	<users>
	 <user id="1">
	 <name>张三</name>
	 <age>18</age>
	 </user>
	 <user id="2">
	 <name>李四</name>
	 <age>10</age>
	 </user>
	</users>
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　XML　　XML增删改　
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