Java使用DOM4J对XML文件进行增删改查操作
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>
