package com.hz.ch10.dom4jtest01;
/**
 * 创建XML文件
 */
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;

import java.io.FileWriter;
import java.io.IOException;

public class Test01 {
    public static void main(String[] args) {
        //创建Document对象
        Document document = DocumentHelper.createDocument();
        //添加根元素
        Element fruit = document.addElement("fruit");
        //添加子元素
        Element apple = fruit.addElement("apple");
        //添加属性
        apple.addAttribute("type", "red");
        apple.addElement("name").addText("红富士");
        apple.addElement("weight").addText("0.5kg");
        Element mango = fruit.addElement("mango").addAttribute("type", "yellow");
        mango.addElement("name").addAttribute("id", "1001").addText("芒果");
        mango.addElement("weight").addText("0.3kg");
        //写出到文件
        try {
            FileWriter fw = new FileWriter("fruit1.xml");
            XMLWriter xmlWriter = new XMLWriter(fw);
            xmlWriter.write(document);
            xmlWriter.close();
            fw.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        //格式化输出
        OutputFormat of =null;
        XMLWriter xmlWriter=null;
        try {
            FileWriter fw = new FileWriter("fruit2.xml");
            of  = OutputFormat.createPrettyPrint();
            xmlWriter = new XMLWriter(fw, of);
            xmlWriter.write(document);
            xmlWriter.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        //紧凑输出
        try {
            of=OutputFormat.createCompactFormat();
            xmlWriter=new XMLWriter(System.out,of);
            xmlWriter.write(document);
            xmlWriter.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

    }
}

package com.hz.ch10.dom4jtest01;

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

import java.util.Iterator;

/**
 * 解释XML文件
 */
public class Test02 {
    public static void main(String[] args) {
        try {
            //解析器
            SAXReader saxReader = new SAXReader();
            Document document = saxReader.read("fruit1.xml");
            //获取根元素
            Element fruit = document.getRootElement();
           //遍历根的子元素
            Iterator<Element> it = fruit.elementIterator();
            while (it.hasNext()){
                Element element = it.next();
                System.out.println(element.getName()+"的属性："+element.attributeValue("type"));
            }
            
            //遍历元素名为“apple”的根的子元素
            Iterator<Element> elementIterator = fruit.elementIterator("apple");
            while (elementIterator.hasNext()){
                Element element = elementIterator.next();
                System.out.println(element.getName()+"的属性："+element.attributeValue("type"));
            }
            
            
         //遍历3
            Iterator<Element> elementIterator = fruit.elementIterator();
            while (elementIterator.hasNext()) {
                Element child = elementIterator.next();
                //获取当前子元素下的<name>标签
                Element name = child.element("name");
                //获取<name>标签的文本内容
                String text = name.getText();
                System.out.println(child.getName() + "的名称：" + text);
                //获取当前子元素下的<weight>标签
                Element weight = child.element("weight");
                System.out.println(child.getName() + "的重量：" + weight.getText());
                String id = name.attributeValue("id");
                if (id != null) {
                    System.out.println(child.getName() + "的id：" + id);
                }

            }

        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}

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

import java.io.FileWriter;
import java.util.List;

public class UtilsXML {
    private  static Document document=null;

    /**
     * 初始化
     * @param path
     * @throws Exception
     */
    public static void info(String path) throws Exception {
        //构建XML的解析器
        SAXReader saxReader = new SAXReader();
        //读取XML文件  返回Document对象
        document = saxReader.read(path);
    }

    /**
     * 新增XML
     */
    public static void saveXML(){
       document = DocumentHelper.createDocument();
        Element root = document.addElement("books");
        Element book = root.addElement("book").addAttribute("id", "1001");
        book.addElement("name").setText("Java");
    }
    /**
     * 读取XML
     */
    public static void findXML(){
        Element root = document.getRootElement();
        List<Element> elementList= root.elements();
        for (Element element : elementList) {
            String id=element.attributeValue("type");
            System.out.println("-----"+id+"------");
            //获取子元素
            List<Element> elementList1 = element.elements();
            for (Element element1 : elementList1) {
                System.out.println(element1.getName()+""+element1.getText());
            }

        }

    }

    /**
     * 编辑XML
     */
    public static void editXML() throws Exception {
        Element rootElement = document.getRootElement();
        List<Element> elementList = rootElement.elements();
        for (Element element : elementList) {
            if(element.attributeValue("type").equals("yellow")){
                element.element("name").setText("mango");
            }
        }
        Element grape = rootElement.addElement("grape");
        grape.addAttribute("type","purple");
        grape.addElement("name").setText("葡萄");
        grape.addElement("weight").setText("0.1kg");
        //保存XML
        outputXML("fruit2.xml");

    }
    /**
     * 删除XML
     */
    public static void delXML() throws Exception {
        Element rootElement = document.getRootElement();
        List<Element> elementList = rootElement.elements();
        for (Element element : elementList) {
            if(element.attributeValue("type").equals("purple")){
                element.getParent().remove(element);
            }

        }
        //保存XML
        outputXML("fruit2.xml");

    }

    /**
     * 写入XML
     * @param path
     * @throws Exception
     */


    public static void outputXML(String path) throws Exception {
        OutputFormat outputFormat = OutputFormat.createPrettyPrint();
        XMLWriter xmlWriter = new XMLWriter(new FileWriter(path),outputFormat);
        xmlWriter.write(document);
        xmlWriter.close();

    }


    public static void main(String[] args) {
        try {
            info("fruit2.xml");
            //findXML();
            //editXML();
            delXML();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

    }
}