Dom4j操作XML实战，解析和插入XML实例

本例子是用XML来代替数据库的，XML的每个节点代替数据库一行数据。

直说过程：

XML文件结构：定义了一个名为：User.xml的文件：

<?xml version="1.0" encoding="UTF-8"?>

<users>

    <user id="0001" name="小米" password="xiaomi" birthday="1980-09-03" nickname="小强"/>

</users>

定义一个XML操作的工具类：

获取XML文件路径的方法：

private static String fillpath=XmlUtill.class.getClassLoader().getResource("User.xml").getPath();

但是，由于fillpath的路径名称中包含中文，为了处理这个，需要做中文处理，加上：

    private static String fillpath;

    static {

        fillpath=XmlUtill.class.getClassLoader().getResource("User.xml").getPath();

        try {

            fillpath = URLDecoder.decode(fillpath,"utf-8");

        } catch (UnsupportedEncodingException e) {

            e.printStackTrace();

        }

        System.out.println(fillpath);

    }

工具类完整代码：

主要包含：获取Document和写入XML两个操作：

package com.Utill;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.UnsupportedEncodingException;

import java.net.URLDecoder;

import org.dom4j.Document;

import org.dom4j.io.OutputFormat;

import org.dom4j.io.SAXReader;

import org.dom4j.io.XMLWriter;

public class XmlUtill {

    private static String fillpath;

    static {

        fillpath=XmlUtill.class.getClassLoader().getResource("User.xml").getPath();

        try {

            fillpath = URLDecoder.decode(fillpath,"utf-8");

        } catch (UnsupportedEncodingException e) {

            e.printStackTrace();

        }

        //System.out.println(fillpath);

    }

    //获取Document

    public static Document getDocument() throws Exception

    {

         SAXReader reader=new SAXReader();

         Document document=reader.read(new File(fillpath));

         return document;

    }

    //将Document写入XML

    public static void writToXml(Document document) throws IOException

    {

        OutputFormat format=OutputFormat.createPrettyPrint();

        XMLWriter writer=new XMLWriter(new FileOutputStream(fillpath),format);

        writer.write(document);

        format=OutputFormat.createPrettyPrint();

        writer=new XMLWriter(System.out,format);

        writer.write(document);

    }

}

定义一个POJO：User

package com.domain;

import java.util.Date;

public class User {

    private String id;

    private String name;

    private String password;

    private Date    birthday;

    private String nickname;

    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 getPassword() {

        return password;

    }

    public void setPassword(String password) {

        this.password = password;

    }

    public Date getBirthday() {

        return birthday;

    }

    public void setBirthday(Date birthday) {

        this.birthday = birthday;

    }

    public String getNickname() {

        return nickname;

    }

    public void setNickname(String nickname) {

        this.nickname = nickname;

    }

    @Override

    public String toString() {

        return "User [id=" + id + ", name=" + name + ", password=" + password + ", birthday=" + birthday + ", nickname="

                + nickname + "]";

    }

}

定义一个UserImpl类，用来对xml进行查询，新增操作，模拟数据库的查询和新增操作

package com.dao;

import java.text.SimpleDateFormat;

import org.dom4j.Document;

import org.dom4j.Element;

import com.Utill.XmlUtill;

import com.domain.User;

public class UserDaoImpl {

    public void add(User user)

    {

        try {

            Document document=XmlUtill.getDocument();

            Element root=document.getRootElement();

            Element user_tag=root.addElement("user");

            user_tag.addAttribute("id", "0002");

            user_tag.addAttribute("name", "华为");

            user_tag.addAttribute("password","华为");

            user_tag.addAttribute("birthday", user.getBirthday()==null?" ":user.getBirthday().toLocaleString());

            user_tag.addAttribute("nickname", "大强");

            XmlUtill.writToXml(document);

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

    public User find(String name,String password)

    {

        try {

            Document document;

            document = XmlUtill.getDocument();

            Element e=(Element) document.selectSingleNode("//user[@name='"+name+"' and @password='"+password+"']");

            if(e==null)

                return null;

            User user=new User();

            String date=e.attributeValue("birthday");

            if(date==null||date.equals(""))

                user.setBirthday(null);

            else

            {

                //日期转换类

                SimpleDateFormat df=new SimpleDateFormat("yyyy-MM--dd");

                user.setBirthday(df.parse(date));

            }

            user.setId(e.attributeValue("id"));

            user.setName(e.attributeValue("name"));

            user.setPassword(e.attributeValue("password"));

            user.setNickname(e.attributeValue("nickname"));

            System.out.println(user.toString());

            return user;

        } catch (Exception e) {

            e.printStackTrace();

        }

        return null;

    }

}

测试类，测试查询和新增功能：

package com.Test;

import java.util.Date;

import org.junit.jupiter.api.Test;

import com.dao.UserDaoImpl;

import com.domain.User;

class UserTest {

    @Test

    void testAdd() {

        User user=new User();

        user.setId("0002");

        user.setName("华为");

        user.setPassword("huawei");

        user.setBirthday(new Date());

        user.setNickname("大强");

        UserDaoImpl dao=new UserDaoImpl();

        dao.add(user);

    }

    public void TestFind()

    {

        UserDaoImpl dao=new UserDaoImpl();

        dao.find("小米", "xiaomi");

    }

}

巴特西

Dom4j操作XML实战，解析和插入XML实例

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