Java使用DOM4J对XML文件进行增删改查操作-白红宇

Java使用DOM4J对XML文件进行增删改查操作

阅读量：4463 次

发布时间：2019-06-08

本文共 8581 字，大约阅读时间需要 28 分钟。

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
     
       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
      
        persons = new ArrayList
       
        ();                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
        
          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：


     
        
           
       
        测试3
             
       
        http://loalhost
             
       
        test3
             
       
        123456
          
          
           
       
        测试4
             
       
        http://localhost
             
       
        test4
             
       
        123456