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

 1 import java.io.File;
 2 import java.io.FileNotFoundException;
 3 import java.io.FileOutputStream;
 4 import java.io.IOException;
 5 import java.util.ArrayList;
 6
 7 import org.jdom.Document;
 8 import org.jdom.Element;
 9 import org.jdom.input.SAXBuilder;
10 import org.jdom.output.Format;
11 import org.jdom.output.XMLOutputter;
12
13 public class AddXml {
14     public static void main(String[] args) {
15         new AddXml().changeXml();
16     }
17     public void changeXml(){
18         Jdbc jdbc =  new Jdbc();
19         jdbc.addList();
20         ArrayList<Student> stuLists = Jdbc.getStuList();
21
22         Document docu = new Document();
23         Element root = new Element("root");
24         docu.addContent(root);
25         for (int i = 0; i < stuLists.size(); i++) {
26 //            System.out.println(stuLists.get(i));
27             Student s = stuLists.get(i);
28
29             Element info = new Element("info");
30             Element student = new Element("student");
31             Element id = new Element("id");
32             Element name = new Element("name");
33             Element sex = new Element("sex");
34             Element age = new Element("age");
35
36             Element book = new Element("book");
37             Element bid = new Element("bid");
38             Element bname = new Element("bname");
39             Element bprice = new Element("bprice");
40             Element bautor = new Element("bautor");
41             book.addContent(bid);
42             book.addContent(bname);
43             book.addContent(bprice);
44             book.addContent(bautor);
45
46             student.addContent(id);
47             student.addContent(name);
48             student.addContent(sex);
49             student.addContent(age);
50             info.addContent(student);
51             info.addContent(book);
52
53             root.addContent(info);
54             int a = i+1;
55             String No = "000"+a;
56             student.setAttribute("No", No);
57             id.setText(s.getId());
58             name.setText(s.getName());
59             sex.setText(s.getSex());
60             age.setText(s.getAge());
61
62             String b="0"+a;
63             bid.setText(b);
64             bname.setText("java核心");
65             bprice.setText("1334.0");
66             bautor.setText("star");
67
68         }
69             //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...
70           Format format = Format.getCompactFormat();
71           format.setEncoding("utf-8");
72           format.setIndent("  ");
73         XMLOutputter xo = new XMLOutputter(format);
74         try {
75             xo.output(docu, new FileOutputStream(new File("e:/io/stu.xml")));
76         } catch (FileNotFoundException e) {
77             // TODO Auto-generated catch block
78             e.printStackTrace();
79         } catch (IOException e) {
80             // TODO Auto-generated catch block
81             e.printStackTrace();
82         }
83         System.out.println("生成xml文件成功！！！");
84     }
85 }

结果如图所示：

下面是用java解析上面所写的xml文件

简写版

 1 package com.direct.demo;
 2
 3 import java.io.IOException;
 4 import java.util.List;
 5
 6 import org.jdom.Document;
 7 import org.jdom.Element;
 8 import org.jdom.JDOMException;
 9 import org.jdom.input.SAXBuilder;
10
11 public class Saxxml {
12
13     public static void main(String[] args) {
14         //解析xml文档
15         SAXBuilder builder =  new SAXBuilder();
16         Document  docu = null;
17         try {
18             docu = builder.build("e:/io/stu.xml");
19         } catch (JDOMException e) {
20             e.printStackTrace();
21         } catch (IOException e) {
22             e.printStackTrace();
23         }
24
25          Element root = docu.getRootElement();//得到根目录
26          List stulist = root.getChildren();
27          System.out.println(stulist.size()+"-----------");
28          System.out.println("------------------读取xml文档的信息---------------------");
29         for (int i = 0; i < stulist.size(); i++) {
30             Element e = (Element) stulist.get(i);
31             String stuid;
32             String stuname ;
33             String stusex ;
34             String stuage;
35             if (i==0) {
36                  stuid = e.getChildText("stuid");
37                 stuname = e.getChildText("stuname");
38                 stusex = e.getChildText("stusex");
39                 stuage = e.getChildText("stuage");
40             }else {
41                 stuid = e.getChildText("stuid"+i);
42                 stuname = e.getChildText("stuname"+i);
43                 stusex = e.getChildText("stusex"+i);
44                  stuage = e.getChildText("stuage"+i);
45             }
46             System.out.println("属性："+e.getAttributeValue("No"));
47             System.out.println("学号："+stuid);
48             System.out.println("姓名："+stuname);
49             System.out.println("年龄："+stuage);
50             System.out.println("性别："+stusex);
51             System.out.println("--------------------");
52         }
53     }
54 }