Dom4j解析xml总结

package com.wnl.parselxml;

import java.io.File;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.Date;
import java.util.Iterator;
import java.util.List;

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

public class ChinaXml {

/**
* 快速入门
* @throws Exception
*/
@Test
public void test1() throws Exception {
// 获取SAX解析器
SAXReader saxReader = new SAXReader();
Document document = saxReader.read(new File("src/china.xml"));
// 获取根节点
Element root = document.getRootElement();
// String cityElement= element.element("city").getText();
// System.out.println(cityElement);
/**
* 遍历所有节点,即root的子节点
*/
System.out.println("====遍历所有节点,即root的子节点===");
for (Iterator i = root.elementIterator(); i.hasNext();) {
Element element = (Element) i.next();
System.out.println(element.getName());
}
/**
* 遍历root节点的属性
*/
System.out.println("======遍历root下指定名称的节点======");
for (Iterator i = root.elementIterator("attraction"); i.hasNext();) {
Element element = (Element) i.next();
System.out.println(element.getName());
}
/**
* 输出root子节点的所有属性
*/
System.out.println("=============");
for (Iterator i = root.attributeIterator(); i.hasNext();) {
Attribute attribute = (Attribute) i.next();
System.out.println("name=" + attribute.getName() + "    value="
+ attribute.getData());
}
}

@Test
// 取出同名节点的内容
public void test2() throws Exception {

SAXReader reader = new SAXReader();
Document document = reader.read(new File("src/china.xml"));
Element root = document.getRootElement();
List<Element> list = root.elements("attraction");
for (int i = 0; i < list.size(); i++) {
Element attracEle = list.get(i);
String place = attracEle.element("place").getTextTrim();
System.out.println(place);
}
}

/**
* 在<attraction>下增加新的节点
* DocumentHelper  可以增加节点、属性
* @throws Exception
*/
@Test
public void test3() throws Exception {
SAXReader reader = new SAXReader();
Document document = reader.read(new File("src/china.xml"));
//获取文档根节点
Element root = document.getRootElement();
//取得attraction节点
Element attracEle = root.element("attraction");
//在attraction节点添加新的节点
Element dateEle = DocumentHelper.createElement("date");
dateEle.setText("八月");
dateEle.setAttributeValue("month", "12");
attracEle.add(dateEle);
//更新xml
//      Writer writer = new FileWriter(new File("src/china.xml"));//出现乱码
//方法 1
//      Writer writer=new OutputStreamWriter(new FileOutputStream("src/china.xml"), "gb2312");
//      document.write(writer);
//      writer.close();
//方法 2
/*
* XMLWriter默认使用utf-8编码
*/
//      XMLWriter xmlWriter=new XMLWriter(new FileOutputStream("src/china.xml"));
OutputFormat format=OutputFormat.createPrettyPrint();
format.setEncoding("utf-8");
XMLWriter xmlWriter=new XMLWriter(new FileOutputStream("src/china.xml"),format);
xmlWriter.write(document);

}

/**
* 修改节点
* @throws Exception
*/

@Test
public void test4() throws Exception{
SAXReader reader = new SAXReader();
Document document = reader.read(new File("src/china.xml"));
//获取文档根节点
Element root = document.getRootElement();
Element dateEle=root.element("attraction").element("date");
dateEle.setText(new Date()+"");
//更新xml
OutputFormat format=OutputFormat.createPrettyPrint();
format.setEncoding("utf-8");
XMLWriter xmlWriter=new XMLWriter(new FileOutputStream("src/china.xml"),format);
xmlWriter.write(document);
}

/**
*删除节点
* @throws Exception
*/
@Test
public void test5() throws Exception{
SAXReader reader = new SAXReader();
Document document = reader.read(new File("src/china.xml"));
//获取文档根节点
Element root = document.getRootElement();

Element cityEle=root.element("city");
cityEle.getParent().remove(cityEle);
//更新xml
OutputFormat format=OutputFormat.createPrettyPrint();
format.setEncoding("utf-8");
XMLWriter xmlWriter=new XMLWriter(new FileOutputStream("src/china.xml"),format);
xmlWriter.write(document);

}
/**
* 在指定位置添加节点
* @throws Exception
*/
@Test
public void test6() throws Exception{
SAXReader reader = new SAXReader();
Document document = reader.read(new File("src/china.xml"));
//获取文档根节点
Element root = document.getRootElement();

List<Element> listEle= root.elements();
for(int i=0;i<listEle.size();i++){
Element noteEle=DocumentHelper.createElement("记录");
noteEle.setText("这是第"+i+"个景点");
listEle.get(i).add(noteEle);
}
//更新xml
OutputFormat format=OutputFormat.createPrettyPrint();
format.setEncoding("utf-8");
XMLWriter xmlWriter=new XMLWriter(new FileOutputStream("src/china.xml"),format);
xmlWriter.write(document);
}
/**
* 操作属性
* @throws Exception
*/
@Test
public void test7() throws Exception{
SAXReader reader = new SAXReader();
Document document = reader.read(new File("src/china.xml"));
//获取文档根节点
Element root = document.getRootElement();
Element attracEle=root.element("attraction");
/**
* 添加属性
*/
//      Attribute attribute=  DocumentHelper.createAttribute(attracEle, "国家", "中国");
//      attracEle.add(attribute);
/**
* 修改属性
*/
//      Attribute attribute=attracEle.attribute("国家");
//      attribute.setValue("北京");
//  attribute.setName("capital");  无法修改名字
/**
* 查找属性
*/
//      Attribute attribute=attracEle.attribute("国家");
//      String name=attribute.getName();
//      String value=attribute.getValue();
//      System.out.println("name="+name+" "+"value="+value);
/**
* 删除属性
*/
Attribute attribute=attracEle.attribute("国家");
attracEle.remove(attribute);
//更新xml
OutputFormat format=OutputFormat.createPrettyPrint();
format.setEncoding("utf-8");
XMLWriter xmlWriter=new XMLWriter(new FileOutputStream("src/china.xml"),format);
xmlWriter.write(document);
}
/**
* xpath
* @throws Exception
*/
@Test
public void test8() throws Exception{
// 获取SAX解析器
SAXReader saxReader = new SAXReader();
Document document = saxReader.read(new File("src/china.xml"));
// 获取根节点
Element root = document.getRootElement();
List<Element> eleList=root.selectNodes("//weather");
System.out.println(eleList);
}
}

<?xml version="1.0" encoding="utf-8"?>
<country name="中国" id="haahh">
<attraction  id="1">
<place>云贵高原</place>
<weather>晴朗</weather>
<traffic>高铁</traffic>
<date month="12">Sun Jun 05 22:41:10 CST 2016</date>
<记录>这是第0个景点</记录>
</attraction>
<attraction>
<place>上海浦东</place>
<weather>多云</weather>
<traffic>大巴</traffic>
<记录>这是第1个景点</记录>
</attraction>
<attraction>
<place>黑龙江</place>
<weather>晴朗</weather>
<traffic>京广高铁</traffic>
<记录>这是第2个景点</记录>
</attraction>

</country>