xml的使用

先贴代码：

books.xml：

<?xml version="1.0" encoding="UTF-8"?>
<books>
   <book sn="SN12341232">
       <name>辟邪剑谱</name>
       <price>9.9</price>
       <author>班主任</author>
   </book>
   <book sn="SN12341231">
       <name>葵花宝典</name>
       <price>99.99</price>
       <author>班长</author>
   </book>
</books>

-----------------------------------------------------

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

import javax.xml.soap.Node;

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

public class myXMLTest {

   public static void main(String[] args) throws Exception {
//       getDocument();
//       getXML();
//       addXML();
       xpathTest();
   }

   public static Document getDocument() throws Exception {
       SAXReader reader = new SAXReader();
       Document document = reader.read("src/books.xml");
       return document;
   }

   public static void getXML() throws Exception {
       Document document = getDocument();
       Element root = document.getRootElement();

       List<Element> elements = root.elements();
       for(Element element : elements) {
           System.out.println(element.elementText("name"));
           System.out.println(element.elementText("price"));
           System.out.println(element.elementText("author"));

           System.out.println(element.attributeValue("sn"));

           System.out.println(new myBook(element.elementText("name"),
                   element.attributeValue("sn"), element.elementText("author"),
                   Double.valueOf(element.elementText("price"))));
       }
   }

   public static void addXML() throws Exception {
       Document document = getDocument();
       Element element = (Element)document.getRootElement().elements("book").get(1);
       Element girlElement = element.addElement("girl");
       girlElement.addText("凤姐");
       girlElement.addAttribute("boyfriend", "班长");

////       System.out.println(element.asXML());
//       FileWriter fWriter = new FileWriter("foo.xml");
//       document.write(fWriter);
//       fWriter.close();

//       XMLWriter xmlWriter = new XMLWriter(new FileWriter("foo1.xml"));
//       xmlWriter.write(document);
//       xmlWriter.close();

       OutputFormat outputFormat = OutputFormat.createPrettyPrint();
       XMLWriter xmlWriter = new XMLWriter(new FileWriter("fool3.xml"), outputFormat);
       xmlWriter.write(document);
       xmlWriter.close();

//       OutputFormat outputFormat = OutputFormat.createCompactFormat();
//       XMLWriter xmlWriter = new XMLWriter(new FileWriter("fool2.xml"), outputFormat);
//       xmlWriter.write(document);
//       xmlWriter.close();
   }

   public static void xpathTest() throws Exception {
       SAXReader saxReader = new SAXReader();
       Document document = saxReader.read("src/books.xml");

//       需求1. 获取books下的所有book标签 /books/book
       List<Element> books = document.selectNodes("books/book");
       for(Element bookElement : books) {
           System.out.println(bookElement.asXML());
       }

//       需求2. 获取根标签下的books元素下的book元素，且这个book元素拥有sn属性，
//       且值为SN12341231。下的name元素   /books/book[@sn='SN12341231']/name
       Element node = (Element) document.selectSingleNode("books/book[@sn='SN12341231']/name");
       System.out.println(node.asXML());

//       需求3. 获取根标签下的books元素下的第一个book元素   /books/book[1]
       Element element = (Element) document.selectSingleNode("/books/book[1]");
       System.out.println(element.asXML());
   }

}

上述代码函数getDocument()、getXML()、addXML()需要先读取写明了文件，读取xml文件需要引用.jar文件dom4j-1.6.1.jar

addXML()中还列举了保存几种形式的xml文件的方式，比如美观型保存、紧凑型保存

代码函数xpathTest()中使用了xpath方式访问，需要引用.jar文件jaxen-1.1-beta-6.jar

.jar资源地址：https://download.csdn.net/download/qq_25106373/10544902

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