dom4j解析xml文档(增删改查) 

 1 package itcast.dom4j;
 2 
 3 import java.io.File;
 4 import java.io.FileOutputStream;
 5 import java.io.FileWriter;
 6 import java.io.IOException;
 7 import java.util.List;
 8 
 9 import org.dom4j.Document;
10 import org.dom4j.DocumentException;
11 import org.dom4j.DocumentHelper;
12 import org.dom4j.Element;
13 import org.dom4j.io.OutputFormat;
14 import org.dom4j.io.SAXReader;
15 import org.dom4j.io.XMLWriter;
16 import org.junit.Test;
17 
18 public class Demo {
19 
20     
21 
22     // 在第一本书上添加一个新的售价：<price>209yuan</price>
23     @Test
24     public void add() throws Exception {
25         SAXReader reader = new SAXReader();
26         Document document = reader.read(new File("src/book.xml"));
27 
28         Element book = document.getRootElement().element("书");
29         book.addElement("price").setText("209yuan");
30 
31         OutputFormat format = OutputFormat.createPrettyPrint();
32         format.setEncoding("UTF-8");
33 
34         XMLWriter writer = new XMLWriter(new FileOutputStream("src/book.xml"),
35                 format);
36         writer.write(document);
37         writer.close();
38     }
39 
40     @Test
41     public void add2() throws Exception {
42         SAXReader reader = new SAXReader();
43         Document document = reader.read(new File("src/book.xml"));
44 
45         Element book = document.getRootElement().element("书");
46         List list = book.elements();// bookname/author/price
47 
48         Element price = DocumentHelper.createElement("price");
49         price.setText("309yuan");
50 
51         list.add(2, price);
52 
53         OutputFormat format = OutputFormat.createPrettyPrint();
54         format.setEncoding("UTF-8");
55 
56         XMLWriter writer = new XMLWriter(new FileOutputStream("src/book.xml"),
57                 format);
58         writer.write(document);
59         writer.close();
60     }
61 
62     @Test
63     public void delete() throws Exception {
64         SAXReader reader = new SAXReader();
65         Document document = reader.read(new File("src/book.xml"));
66 
67         Element price = document.getRootElement().element("书").element("price");
68         price.getParent().remove(price);
69 
70         OutputFormat format = OutputFormat.createPrettyPrint();
71         format.setEncoding("UTF-8");
72 
73         XMLWriter writer = new XMLWriter(new FileOutputStream("src/book.xml"),
74                 format);
75         writer.write(document);
76         writer.close();
77     }
78     
79     @Test
80     public void update() throws Exception {
81         SAXReader reader = new SAXReader();
82         Document document = reader.read(new File("src/book.xml"));
83 
84         Element book = (Element) document.getRootElement().elements("书").get(1);
85         book.element("editor").setText("zero");
86 
87         OutputFormat format = OutputFormat.createPrettyPrint();
88         format.setEncoding("UTF-8");
89 
90         XMLWriter writer = new XMLWriter(new FileOutputStream("src/book.xml"),
91                 format);
92         writer.write(document);
93         writer.close();
94     }
95 
96 }
View Code
 1 <?xml version="1.0" encoding="UTF-8"?>
 2 
 3 <书架> 
 4   <书> 
 5     <bookname name="zero">java jiuyepeixunjiaocheng</bookname>  
 6     <editor>zhangxiaoxiang</editor>  
 7     <price>209yuan</price> 
 8   </书>  
 9   <书> 
10     <bookname name="one">javaWebprogramming</bookname>  
11     <editor>zero</editor>  
12     <price>28.00yuan</price> 
13   </书> 
14 </书架>
View Code

 

posted @ 2014-06-22 18:24  是但哥  阅读(266)  评论(0)    收藏  举报