dom4j简单实例

1、读写xml

 1 package com.test.transport.service;
 2 
 3 import java.io.File;
 4 import java.io.FileWriter;
 5 import java.io.IOException;
 6 import java.util.Iterator;
 7 import java.util.List;
 8 
 9 import org.apache.log4j.Logger;
10 import org.dom4j.Attribute;
11 import org.dom4j.Document;
12 import org.dom4j.DocumentException;
13 import org.dom4j.DocumentHelper;
14 import org.dom4j.Element;
15 import org.dom4j.io.OutputFormat;
16 import org.dom4j.io.SAXReader;
17 import org.dom4j.io.XMLWriter;
18 
19 public class XMLService {
20     public static Logger log = Logger.getLogger(XMLService.class);
21     public Document getDocument(){
22         Document doc = DocumentHelper.createDocument();
23         doc.addComment("a simple demo ");
24         Element root = doc.addElement("Persons");
25         Element p1 = root.addElement("Person");
26         p1.addAttribute("name", "xiaohei");
27         p1.addAttribute("age", "20");
28         p1.addAttribute("sex", "male");
29         Element p2 = root.addElement("Person");
30         p2.addAttribute("name", "xiaobai");
31         p2.addAttribute("age", "21");
32         p2.addAttribute("sex", "female");
33         return doc;
34     }
35     public void saveDocument(Document doc,String filepath){
36         OutputFormat format = OutputFormat.createPrettyPrint();
37         XMLWriter writer = null;
38         try {
39             writer = new XMLWriter(new FileWriter(new File(filepath)), format);
40             writer.write(doc);
41             writer.flush();
42             writer.close();
43         } catch (IOException e) {
44             log.error("文件错误");
45             e.printStackTrace();
46         }
47     }
48     public static void main(String args[]){
49         XMLService service = new XMLService();
50         Document doc = service.getDocument();
51         service.saveDocument(doc, "demo.xml");
52     }
53 }

 

2、增加修改方法

 1 package com.test.transport.service;
 2 
 3 import java.io.File;
 4 import java.io.FileWriter;
 5 import java.io.IOException;
 6 import java.util.Iterator;
 7 import java.util.List;
 8 
 9 import org.apache.log4j.Logger;
10 import org.dom4j.Attribute;
11 import org.dom4j.Document;
12 import org.dom4j.DocumentException;
13 import org.dom4j.DocumentHelper;
14 import org.dom4j.Element;
15 import org.dom4j.io.OutputFormat;
16 import org.dom4j.io.SAXReader;
17 import org.dom4j.io.XMLWriter;
18 
19 public class XMLService {
20     public static Logger log = Logger.getLogger(XMLService.class);
21     public Document getDocument(){
22         Document doc = DocumentHelper.createDocument();
23         doc.addComment("a simple demo ");
24         Element root = doc.addElement("Persons");
25         Element p1 = root.addElement("Person");
26         p1.addAttribute("name", "xiaohei");
27         p1.addAttribute("age", "20");
28         p1.addAttribute("sex", "male");
29         Element p2 = root.addElement("Person");
30         p2.addAttribute("name", "xiaobai");
31         p2.addAttribute("age", "21");
32         p2.addAttribute("sex", "female");
33         return doc;
34     }
35     public void saveDocument(Document doc,String filepath){
36         OutputFormat format = OutputFormat.createPrettyPrint();
37         XMLWriter writer = null;
38         try {
39             writer = new XMLWriter(new FileWriter(new File(filepath)), format);
40             writer.write(doc);
41             writer.flush();
42             writer.close();
43         } catch (IOException e) {
44             log.error("文件错误");
45             e.printStackTrace();
46         }
47     }
48     public Document editDocument(File inputFile){
49         SAXReader saxReader = new SAXReader();
50         Document doc = null;
51         try {
52             doc = saxReader.read(inputFile);
53         } catch (DocumentException e) {
54             log.error("读取文件错误");
55             e.printStackTrace();
56         }
57         List<Attribute> list = doc.selectNodes("//Persons/Person/@name");
58         Iterator<Attribute> iterator = list.iterator();
59         while(iterator.hasNext()){
60             Attribute attribute = iterator.next();
61             if(attribute.getValue().endsWith("xiaohei")){
62                 attribute.setValue("zhaodaoxiaohei");
63             }
64         }
65         List<Element> list2 = doc.selectNodes("//Persons/Person");
66         Iterator<Element> iterator2 = list2.iterator();
67         while (iterator2.hasNext()) {
68             Element element = iterator2.next();
69             element.addText("5");
70             if(element.attributeValue("name").equals("xiaobai")){
71                 element.addElement("grade").addText("3");
72             }
73         }
74         return doc;
75     }
76     public static void main(String args[]){
77         XMLService service = new XMLService();
78         Document doc = service.getDocument();
79         service.saveDocument(doc, "demo.xml");
80         
81         Document document = service.editDocument(new File("demo.xml"));
82         service.saveDocument(document, "demo.xml");
83     }
84 }

 有关XPath详见：http://baike.baidu.com/view/307399.htm

 

posted @ 2012-12-04 12:42  Gnight  阅读(2224)  评论(0)  编辑  收藏  举报