java 生成和解析xml

Posted 2020-10-07 TheStar

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

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