Java使用DOM4J对XML文件进行增删改查操作

时间：2023-03-08 16:53:56

Java进行XML文件操作，代码如下：

package com.founder.mrp.util;

import java.io.File;

import java.util.ArrayList;

import java.util.List;

import org.dom4j.Document;

import org.dom4j.DocumentHelper;

import org.dom4j.Element;

import org.dom4j.Node;

import com.founder.mrp.domain.ClientLoginUser;

import com.founder.mrp.util.md5.MD5;

public class XMLOperateUser {

    /*

     * 查询全部xml

     * */

    public static List<ClientLoginUser> ListClinetLoginUser(String appDir) throws Exception{

        File dir = new File(appDir+"\\persons.xml");

        if (!dir.exists()) {

            dir.createNewFile();

            Document dom = DocumentHelper.createDocument();

            Element root = dom.addElement("persons");

            String dirpath = dir+"";

            UtilsForXML.writeToXML(dom, dirpath);

        }

        String dirPath = dir+"";

        Document dom = UtilsForXML.getDocument(dirPath);

        Element root = dom.getRootElement();

        List<ClientLoginUser> persons = new ArrayList<ClientLoginUser>();

        List list = root.elements();

        for (int i = 0; i < list.size(); i++) {

            Element person = (Element) list.get(i);

            ClientLoginUser c = new ClientLoginUser();

            String id = person.attributeValue("id");

            c.setId(Integer.parseInt(id));

            List ll = person.elements();

            for (int j = 0; j < ll.size(); j++) {

                Element element = (Element) ll.get(j);

                if ("publishername".equals(element.getName())) {

                    String publisherName = element.getText();

                    c.setPublisherName(publisherName);

                }

                if ("serverurl".equals(element.getName())) {

                    String serverurl = element.getText();

                    c.setServerUrl(serverurl);

                }

                if ("username".equals(element.getName())) {

                    String username = element.getText();

                    c.setUserName(username);

                }

                if ("password".equals(element.getName())) {

                    String password = element.getText();

                    c.setPassword(password);

                }

            }

            persons.add(c);

        }

        return persons;

    }

    /*

     * 根据person的属性id查询xml

     * */

    public static ClientLoginUser QueryClinetLoginUserById(String appDir,int id) throws Exception{

        File dir = new File(appDir+"\\persons.xml");

        String dirPath = dir+"";

        Document dom = UtilsForXML.getDocument(dirPath);

        Element root = dom.getRootElement();

        ClientLoginUser person = new ClientLoginUser();

        Element beQuery = (Element)root.selectSingleNode("//person[@id="+id+"]");

        if(beQuery!=null){

            person.setPublisherName(beQuery.elementText("publishername"));

            person.setServerUrl(beQuery.elementText("serverurl"));

            person.setUserName(beQuery.elementText("username"));

            person.setPassword(beQuery.elementText("password"));

            person.setId(id);

        }

        return person;

    }

    /*

     * 增加xml数据

     * */

    public static int AddClinetLoginUser(String appDir,String publisherName,String serverUrl,String userName,String passWord) throws Exception{

        File dir = new File(appDir+"\\persons.xml");

        if (!dir.exists()) {

             dir.createNewFile();

        }

        int id = 1;

        String dirPath = dir+"";

        Document dom = UtilsForXML.getDocument(dirPath);

        Element root = dom.getRootElement();

        List<Element> list = root.elements("person");

        if(!list.isEmpty()||list.size()!=0){

            int count = list.size();

            Element lastperson = list.get(count-1);

            String value = lastperson.attributeValue("id");

            id = Integer.parseInt(value)+1;

        }

//        int id = (int) ((Math.random()*9+1)*1000);

        Element newPerson = root.addElement("person");

        newPerson.addAttribute("id", id+"");

        Element publishername = newPerson.addElement("publishername");

        publishername.setText(publisherName);

        Element serverurl = newPerson.addElement("serverurl");

        serverurl.setText(serverUrl);

        Element username = newPerson.addElement("username");

        username.setText(userName);

        Element password = newPerson.addElement("password");

        password.setText(passWord);

        UtilsForXML.writeToXML(dom, dirPath);

        return id;

    }

    /*

     * 根据person属性id修改xml数据

     * */

    public static int UpdateClinetLoginUser(int id,String appDir,String publisherName,String serverUrl,String userName,String passWord) throws Exception{

        File dir = new File(appDir+"\\persons.xml");

        String dirPath = dir+"";

        Document dom = UtilsForXML.getDocument(dirPath);

        Element root = dom.getRootElement();

        Element beQuery = (Element)root.selectSingleNode("//person[@id="+id+"]");

        beQuery.element("publishername").setText(publisherName);

        beQuery.element("serverurl").setText(serverUrl);

        beQuery.element("username").setText(userName);

        beQuery.element("password").setText(passWord);

        UtilsForXML.writeToXML(dom, dirPath);

        return id;

    }

    /*

     * 根据person属性id删除xml数据

     * */

    public static int DeleteClinetLoginUser(int id,String appDir) throws Exception{

        File dir = new File(appDir+"\\persons.xml");

        String dirPath = dir+"";

        Document dom = UtilsForXML.getDocument(dirPath);

        Element root = dom.getRootElement();

        Element beQuery = (Element)root.selectSingleNode("//person[@id="+id+"]");

        beQuery.getParent().remove(beQuery);

        UtilsForXML.writeToXML(dom, dirPath);

        return id;

    }

}

需要的工具类：

package com.founder.mrp.util;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.io.OutputStreamWriter;

import java.io.Reader;

import org.dom4j.Document;

import org.dom4j.io.OutputFormat;

import org.dom4j.io.SAXReader;

import org.dom4j.io.XMLWriter;

public class UtilsForXML {

    /**

     * 需要一个方法来创建DOM4j的XML解析器并返回一个document对象

     * add by hanwl

     * @throws Exception

     */

    public static Document getDocument(String xmlPath) throws Exception {

        Reader reader = new InputStreamReader(new FileInputStream(new File(xmlPath)),"utf-8");

        SAXReader saxReader = new SAXReader();

        //将XML文件路径传给Document对象并返回其实例dom

        Document dom = saxReader.read(reader);

        return dom;

    }

    /**

     * 需要一个方法来将更新后的document对象写入到XML文件中去

     * add by hanwl

     * @throws Exception

     */

    public static void writeToXML(Document dom ,String xmlPath) throws Exception{

        //首先创建样式和输出流

        OutputFormat format = new OutputFormat().createPrettyPrint();

        OutputStreamWriter out = new OutputStreamWriter(new FileOutputStream(xmlPath),"utf-8");

        //OutputStream out = new FileOutputStream(xmlPath);

        XMLWriter writer = new XMLWriter(out,format);

        //写入之后关闭流

        writer.write(dom);

        writer.close();

    }

}

用到的实体类：

package com.founder.mrp.domain;

public class ClientLoginUser {

    private int id;

    private String publisherName;

    private String serverUrl;

    private String userName;

    private String password;

    public int getId() {

        return id;

    }

    public void setId(int id) {

        this.id = id;

    }

    public String getPublisherName() {

        return publisherName;

    }

    public void setPublisherName(String publisherName) {

        this.publisherName = publisherName;

    }

    public String getServerUrl() {

        return serverUrl;

    }

    public void setServerUrl(String serverUrl) {

        this.serverUrl = serverUrl;

    }

    public String getUserName() {

        return userName;

    }

    public void setUserName(String userName) {

        this.userName = userName;

    }

    public String getPassword() {

        return password;

    }

    public void setPassword(String password) {

        this.password = password;

    }

}

这是web程序操作的代码，一些controller请求和jsp页面没有放，主要看dom4j操作xml

下面是本次用例XML文件：

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

<persons>

  <person id="1">

    <publishername>测试3</publishername>

    <serverurl>http://loalhost</serverurl>

    <username>test3</username>

    <password>123456</password>

  </person>

  <person id="2">

    <publishername>测试4</publishername>

    <serverurl>http://localhost</serverurl>

    <username>test4</username>

    <password>123456</password>

  </person>

</persons>

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