java dom 修改xml

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hoho_12 2016-08-10 21:05:42 ©著作权

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给一个空的xml文件写入数据

package com.softeem.dom.write;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;

public class Demo1 {
  public static void main(String[] args) {
    // 增加文档
    Document document = DocumentHelper.createDocument();
    // 增加Element: parent.addElement("childName");
    Element root = document.addElement("userlist");
    // 增加Attribute addAttribute("属性名","属性值")
    Element user1 = root.addElement("user");
    user1.addAttribute("id", "100");
    Element username = user1.addElement("username");
    username.setText("小周");
    Element password = user1.addElement("password");
    password.setText("admin");

    // 写入文件
    XMLWriter xmlWriter = null;
    FileOutputStream fos = null;
    try {
      fos = new FileOutputStream(new File("src\\WriteDemo.xml"));

      // 设置输出格式
      OutputFormat format = OutputFormat.createPrettyPrint();
      format.setEncoding("utf-8");

      // 创建writer(参数一：输出流，参数二L：输出格式)
      xmlWriter = new XMLWriter(fos, format);
      // 写数据
      xmlWriter.write(document);

    } catch (FileNotFoundException e) {
      e.printStackTrace();
    } catch (UnsupportedEncodingException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    } finally {
      try {
        // 关闭资源
        fos.close();
        xmlWriter.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }

  }
}

package com.softeem.dom.write;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;

public class Demo2 {
  public static void main(String[] args) {
    List<UserBean> userList = new ArrayList<UserBean>();
    ArrayList<String> favoriteList = new ArrayList<String>();
    favoriteList.add("看电影");
    favoriteList.add("美食");
    favoriteList.add("旅游");
    userList.add(new UserBean("100", "aaa", "aaa", favoriteList));
    userList.add(new UserBean("101", "bbb", "bbb", favoriteList));
    userList.add(new UserBean("102", "ccc", "ccc", favoriteList));

    save(userList);
  }

  private static void save(List<UserBean> userList) {
    // 1.创建document
    Document document = DocumentHelper.createDocument();
    // 2.将数据加入到document
    // <userlist></userlist>
    Element root = document.addElement("userlist");
    for (UserBean user : userList) {
      // <user id="100"></user>
      Element userEle = root.addElement("user");
      userEle.addAttribute("id", user.getId());
      // <usrename>文本</username>
      Element nameEle = userEle.addElement("username");
      nameEle.setText(user.getUsername());
      // <password>文本</password>
      Element pwdEle = userEle.addElement("password");
      pwdEle.setText(user.getPassword());

      // <favoritelist>...</favoritelist>
      Element favoriteListEle = userEle.addElement("favoritelist");

      List<String> favorites = user.getFavorites();
      for (String favorite : favorites) {
        // <favorite></favorite>
        Element favoriteEle = favoriteListEle.addElement("favorite");
        favoriteEle.setText(favorite);
      }
    }

    // 3.将document持久化
    FileOutputStream fos = null;
    XMLWriter writer = null;
    try {
      fos = new FileOutputStream(new File("src\\UserList.xml"));
      OutputFormat outputFormat = OutputFormat.createPrettyPrint();
      // 编码方式：<?xml version="1.0" encoding="utf-8"?>
      outputFormat.setEncoding("utf-8");

      writer = new XMLWriter(fos, outputFormat);

      writer.write(document);
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    } catch (UnsupportedEncodingException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    } finally {
      try {
        if (writer != null) {
          writer.close();
        }
        if (fos != null) {
          fos.close();
        }
      } catch (IOException e) {
        e.printStackTrace();
      }
    }

  }
}

修改属性值

package com.softeem.dom.write;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;

import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

import com.softeem.utils.StreamUtils;
import com.softeem.utils.XmlUtils;

public class Demo3 {
  public static void main(String[] args) throws DocumentException {

    // 拿到属性对象，修改值
    SAXReader saxReader = new SAXReader();
    Document doc = saxReader.read(new File("src\\UserList.xml"));
    // 获取根节点
    Element root = doc.getRootElement();

    // 取user元素
    Element userEle = root.element("user");
    // 修改属性：
    /*
     * 方式一：获取属性对象，修改属性值 // 获取属性对象 Attribute idAttr =
     * userEle.attribute("id"); // 修改值 if (idAttr != null)
     * idAttr.setValue("1000000");
     */
    // 方式二：添加同名属性(如果属性不存在，添加；存在就覆盖)
    userEle.addAttribute("id", "200000");

    // 修改Element的text
    // (1)找到Element
    Element pwdEle = userEle.element("password");
    // (2)重新设置文本
    pwdEle.setText("123456789");

    // 保存修改（修改的都是document对象，对文件内容没有任何影响）
    XmlUtils.writeDocument(doc, new File("src\\UserList.xml"));
  }

//  /**
//   * 将document中的数据持久化到文件中
//   * 
//   * @param source
//   * @param targetFile
//   */
//  public static void writeDocument(Document source, File targetFile) {
//    FileOutputStream fos = null;
//    XMLWriter xmlWriter = null;
//    try {
//      fos = new FileOutputStream(targetFile);
//      OutputFormat format = OutputFormat.createPrettyPrint();
//      format.setEncoding("utf-8");
//
//      xmlWriter = new XMLWriter(fos, format);
//
//      xmlWriter.write(source);
//    } catch (FileNotFoundException e) {
//      e.printStackTrace();
//    } catch (UnsupportedEncodingException e) {
//      e.printStackTrace();
//    } catch (IOException e) {
//      e.printStackTrace();
//    } finally {
//      try {
//        if (xmlWriter != null)
//          xmlWriter.close();
//      } catch (IOException e) {
//        e.printStackTrace();
//      }
//
//      StreamUtils.closeOut(fos);
//    }
//  }
}

删除元素

package com.softeem.dom.write;

import java.io.File;
import java.util.Iterator;

import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import com.softeem.utils.XmlUtils;

public class Demo4 {
  public static void main(String[] args) throws DocumentException {
    // 删除Element：删除id=101的user元素
    deleteUserById("101");
    // 删除属性 : 删除所有user的id属性
    deleteIdAttribute();
  }

  private static void deleteIdAttribute() throws DocumentException {
    SAXReader reader = new SAXReader();
    Document doc = reader.read(new File("src\\UserList.xml"));

    // 获取root
    Element root = doc.getRootElement();
    // 获取user
    Iterator<Element> userIte = root.elementIterator("user");
    while (userIte.hasNext()) {
      Element userEle = userIte.next();

      // 需要把userEle中的id属性删除
      // 获取属性对象
      Attribute idAttr = userEle.attribute("id");
      idAttr.detach();
      // 方式二：
      // idAttr.getParent().remove(idAttr);
    }

    //持久化
    XmlUtils.writeDocument(doc, new File("src\\UserList.xml"));

  }

  public static void deleteUserById(String id) throws DocumentException {
    SAXReader reader = new SAXReader();
    Document doc = reader.read(new File("src\\UserList.xml"));

    // 获取root
    Element root = doc.getRootElement();
    // 获取user
    Iterator<Element> userIte = root.elementIterator("user");
    while (userIte.hasNext()) {
      Element userEle = userIte.next();

      if (id.equals(userEle.attributeValue("id"))) {
        // 删除
        // 方式一：先获取Element对象，调用detach()
        // userEle.detach();

        // 方式二：使用parent.remove(child);
        userEle.getParent().remove(userEle);
      }
    }

    // 持久化
    XmlUtils.writeDocument(doc, new File("src\\UserList.xml"));
  }
}