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("--------------------");
		}
	}	
}