java 生成和解析xml

本文主要使用的是Jdom.jar包（包的下载百度一下）实现了生成xml文件和解析xml文件

下面是生成xml的实现

说明：stuLists集合是一个存放着Student对象的集合

 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.util.ArrayList;
 
 import org.jdom.Document;
 import org.jdom.Element;
 import org.jdom.input.SAXBuilder;
 import org.jdom.output.Format;
 import org.jdom.output.XMLOutputter;
 
 public class AddXml {
     public static void main(String[] args) {
         new AddXml().changeXml();
     }
     public void changeXml(){
         Jdbc jdbc =  new Jdbc();
         jdbc.addList();
         ArrayList<Student> stuLists = Jdbc.getStuList();
 
         Document docu = new Document();
         Element root = new Element("root");
         docu.addContent(root);
         for (int i = 0; i < stuLists.size(); i++) {
 //            System.out.println(stuLists.get(i));
             Student s = stuLists.get(i);
 
             Element info = new Element("info");
             Element student = new Element("student");
             Element id = new Element("id");
             Element name = new Element("name");
             Element sex = new Element("sex");
             Element age = new Element("age");
 
             Element book = new Element("book");
             Element bid = new Element("bid");
             Element bname = new Element("bname");
             Element bprice = new Element("bprice");
             Element bautor = new Element("bautor");
             book.addContent(bid);
             book.addContent(bname);
             book.addContent(bprice);
             book.addContent(bautor);
 
             student.addContent(id);
             student.addContent(name);
             student.addContent(sex);
             student.addContent(age);
             info.addContent(student);
             info.addContent(book);
 
             root.addContent(info);
             int a = i+1;
             String No = "000"+a;
             student.setAttribute("No", No);
             id.setText(s.getId());
             name.setText(s.getName());
             sex.setText(s.getSex());
             age.setText(s.getAge());
 
             String b="0"+a;
             bid.setText(b);
             bname.setText("java核心");
             bprice.setText("1334.0");
             bautor.setText("star");
 
         }
             //格式化生成的xml文件，如果不进行格式化的话，生成的xml文件将会是很长的一行...
           Format format = Format.getCompactFormat();
           format.setEncoding("utf-8");
           format.setIndent("  ");
         XMLOutputter xo = new XMLOutputter(format);
         try {
             xo.output(docu, new FileOutputStream(new File("e:/io/stu.xml")));
         } catch (FileNotFoundException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (IOException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         System.out.println("生成xml文件成功！！！");
     }
 }

结果如图所示：

下面是用java解析上面所写的xml文件

简写版

package com.direct.demo;
 
import java.io.IOException;
import java.util.List;
 
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
 
public class Saxxml {
 
	public static void main(String[] args) {
		//解析xml文档
		SAXBuilder builder =  new SAXBuilder();
		Document  docu = null;
		try {
			docu = builder.build("e:/io/student.xml");
		} catch (JDOMException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
 
		 Element root = docu.getRootElement();//得到根目录
		 List stulist = root.getChildren();
		 System.out.println(stulist.size()+"-----------");
		 System.out.println("------------------读取xml文档的信息---------------------");
		for (int i = 0; i < stulist.size(); i++) {
			Element e = (Element) stulist.get(i);
			String stuid;
			String stuname ;
			String stusex ;
			String stuage;
			/*String stuValues = e.getAttribute("No").getValue();//属性值
			String stuValues1 = e.getAttributeValue("No");
			if (stuValues.equals("102")) {
				//修改姓名
				System.out.println(stuValues);
				e.getChild("stuname").setText("砖石王老五");
				//删除元素
				root.removeContent(e);
				break;
			}*/
 
			if (i==0) {
				 stuid = e.getChildText("stuid");
				stuname = e.getChildText("stuname");
				stusex = e.getChildText("stusex");
				stuage = e.getChildText("stuage");
			}else {
				stuid = e.getChildText("stuid"+i);
				stuname = e.getChildText("stuname"+i);
			    stusex = e.getChildText("stusex"+i);
				 stuage = e.getChildText("stuage"+i);
			}
			System.out.println("属性："+e.getAttributeValue("No"));
			System.out.println("学号："+stuid);
			System.out.println("姓名："+stuname);
			System.out.println("年龄："+stuage);
			System.out.println("性别："+stusex);
			System.out.println("--------------------");
		}
	}
}