【转载】dom4j读写xml文档

原文

http://kukuqiu.javaeye.com/blog/163476

 

据悉dom4j在xml解析方面是性能最好的，hibernate等框架都使用它作为解析的工具
写了简单的dom4j的使用的demo，以备回忆，有些是dom4j的文挡里例子改编的
使用dom4j解析下面的xml文件

Xml代码

1. <?xml version="1.0" encoding="GB2312"?>    
2.   
3. <?xml-stylesheet type="text/xsl" href="students.xsl"?>  
4.   
5. <students>  
6.     <student sn="01">  
7.         <name>张三</name>  
8.         <age>18</age>  
9.     </student>  
10.        
11.     <student sn="02">  
12.         <name>李四</name>  
13.         <age>20</age>  
14.     </student>  
15. </students>  

<?xml version="1.0" encoding="GB2312"?> <?xml-stylesheet type="text/xsl" href="students.xsl"?><students>    <student sn="01">        <name>张三</name>        <age>18</age>    </student>        <student sn="02">        <name>李四</name>        <age>20</age>    </student></students>

Parse.java

Java代码

1. import java.io.File;   
2.   
3. import org.dom4j.Attribute;   
4. import org.dom4j.Document;   
5. import org.dom4j.DocumentException;   
6. import org.dom4j.Element;   
7. import org.dom4j.ProcessingInstruction;   
8. import org.dom4j.VisitorSupport;   
9. import org.dom4j.io.SAXReader;   
10.   
11. public class Parse {   
12.   
13.     public static void main(String[] args) {   
14.         SAXReader reader = new SAXReader();   
15.         File file = new File("src/students.xml");   
16.         try {   
17.             Document doc = reader.read(file);   
18.             doc.accept(new MyVistor());   
19.         } catch (DocumentException e) {   
20.             // TODO Auto-generated catch block   
21.             e.printStackTrace();   
22.         }   
23.     }   
24.   
25.     public static class MyVistor extends VisitorSupport {   
26.         public void visit(Attribute node) {   
27.             System.out.println("Attibute:---" + node.getName() + "="  
28.                     + node.getValue());   
29.         }   
30.   
31.         public void visit(Element node) {   
32.             if (node.isTextOnly()) {   
33.                 System.out.println("Element:---" + node.getName() + "="  
34.                         + node.getText());   
35.             }else{   
36.                 System.out.println("--------" + node.getName() + "-------");   
37.             }   
38.         }   
39.   
40.         @Override  
41.         public void visit(ProcessingInstruction node) {   
42.             // TODO Auto-generated method stub   
43.             System.out.println("PI:"+node.getTarget()+" "+node.getText());   
44.         }   
45.     }   
46. }  

import java.io.File;import org.dom4j.Attribute;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.Element;import org.dom4j.ProcessingInstruction;import org.dom4j.VisitorSupport;import org.dom4j.io.SAXReader;public class Parse {public static void main(String[] args) {SAXReader reader = new SAXReader();File file = new File("src/students.xml");try {Document doc = reader.read(file);doc.accept(new MyVistor());} catch (DocumentException e) {// TODO Auto-generated catch blocke.printStackTrace();}}public static class MyVistor extends VisitorSupport {public void visit(Attribute node) {System.out.println("Attibute:---" + node.getName() + "="+ node.getValue());}public void visit(Element node) {if (node.isTextOnly()) {System.out.println("Element:---" + node.getName() + "="+ node.getText());}else{System.out.println("--------" + node.getName() + "-------");}}@Overridepublic void visit(ProcessingInstruction node) {// TODO Auto-generated method stubSystem.out.println("PI:"+node.getTarget()+" "+node.getText());}}}

使用dom4j来将属性写入xml

Java代码

1. import java.io.FileWriter;   
2. import java.io.IOException;   
3.   
4. import org.dom4j.Document;   
5. import org.dom4j.DocumentHelper;   
6. import org.dom4j.Element;   
7. import org.dom4j.io.OutputFormat;   
8. import org.dom4j.io.XMLWriter;   
9.   
10. public class DWriter {   
11.   
12.     public static void main(String[] args) {   
13.         // TODO Auto-generated method stub   
14.         try {   
15.             XMLWriter writer = new XMLWriter(new FileWriter("src/author.xml"));   
16.             Document doc = createDoc();   
17.             writer.write(doc);   
18.             writer.close();   
19.   
20.             // Pretty print the document to System.out   
21.             // 設置了打印的格式,将读出到控制台的格式进行美化   
22.             OutputFormat format = OutputFormat.createPrettyPrint();   
23.             writer = new XMLWriter(System.out, format);   
24.             writer.write(doc);   
25.   
26.         } catch (IOException e) {   
27.             // TODO Auto-generated catch block   
28.             e.printStackTrace();   
29.         }   
30.     }   
31.   
32.     public static Document createDoc() {   
33.         Document doc = DocumentHelper.createDocument();   
34.         Element root = doc.addElement("root");   
35.         Element author1 = root.addElement("author").addAttribute("name",   
36.                 "James").addAttribute("location", "UK")   
37.                 .addText("Jame Strachan");   
38.         Element author2 = root.addElement("author").addAttribute("name", "Bob")   
39.                 .addAttribute("location", "US").addText("Bob McWrirter");   
40.         return doc;   
41.     }   
42.   
43. }  

import java.io.FileWriter;import java.io.IOException;import org.dom4j.Document;import org.dom4j.DocumentHelper;import org.dom4j.Element;import org.dom4j.io.OutputFormat;import org.dom4j.io.XMLWriter;public class DWriter {public static void main(String[] args) {// TODO Auto-generated method stubtry {XMLWriter writer = new XMLWriter(new FileWriter("src/author.xml"));Document doc = createDoc();writer.write(doc);writer.close();// Pretty print the document to System.out// 設置了打印的格式,将读出到控制台的格式进行美化OutputFormat format = OutputFormat.createPrettyPrint();writer = new XMLWriter(System.out, format);writer.write(doc);} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}public static Document createDoc() {Document doc = DocumentHelper.createDocument();Element root = doc.addElement("root");Element author1 = root.addElement("author").addAttribute("name","James").addAttribute("location", "UK").addText("Jame Strachan");Element author2 = root.addElement("author").addAttribute("name", "Bob").addAttribute("location", "US").addText("Bob McWrirter");return doc;}}

使用dom4j写入到author.xml文件的内容

Xml代码

1. <?xml version="1.0" encoding="UTF-8"?>  
2. <root><author name="James" location="UK">Jame Strachan</author><author name="Bob" location="US">Bob McWrirter</author></root>