JDOM对xml的增删改查之SAXBuilder

message.xml文件位于src目录下的xmldom包中
1.message.xml文件：

Java代码

1. <?xml version="1.0" encoding="UTF-8"?>   
2. <root>   
3.     <person id="1">   
4.         <username>admin</username>   
5.         <password>password1</password>   
6.     </person>   
7.     <person id="2">   
8.         <username>manager</username>   
9.         <password>password2</password>   
10.     </person>   
11. </root>  

<?xml version="1.0" encoding="UTF-8"?>
<root>
    <person id="1">
      <username>admin</username>
      <password>password1</password>
    </person>
    <person id="2">
     <username>manager</username>
        <password>password2</password>
    </person>
</root>

2.查询数据

Java代码

1. package xmldom;   
2.   
3. import java.io.*;   
4. import java.util.*;   
5. import org.jdom.*;   
6. import org.jdom.input.SAXBuilder;   
7. import org.jdom.output.XMLOutputter;   
8.   
9. /**  
10.  * xml的增删改查之SAXBuilder  
11.  *   
12.  * @author Administrator  
13.  *   
14.  */  
15. public class XmlTest {   
16.   
17.     // 查询所有的数据   
18.     public static void list() throws JDOMException, IOException {   
19.         SAXBuilder builder = new SAXBuilder();   
20.         String xmlPath = "./src/xmldom/message.xml";   
21.         //String xmlPath = "./WebRoot/xml/message.xml";   
22.         // 获得文档对象   
23.         Document document = builder.build(xmlPath);   
24.         // 获得根节点   
25.         Element root = document.getRootElement();   
26.         List list = root.getChildren();   
27.         System.out.println("root : " + root);   
28.         System.out.println("root.getName : "+root.getName());   
29.         System.out.println("listSize : "+list.size());   
30.         Iterator it = list.iterator();   
31.         while (it.hasNext()) {   
32.             Element e = (Element) it.next();   
33.             System.out.println("ID: " + e.getAttributeValue("id"));   
34.             System.out.println("childUsername:"+e.getChildText("username"));   
35.             System.out.println("childPassword:"+e.getChildText("password"));   
36.         }   
37.            
38.         //for(int i=0;i<list.size();i++){   
39.         //  Element e = (Element)list.get(i);   
40.         //  ...   
41.         //}   
42.     }   
43.     public static void main(String[] args) {   
44.         try {   
45.             XmlTest.list();   
46.         } catch (JDOMException e1) {   
47.             e1.printStackTrace();   
48.         } catch (IOException e1) {   
49.             e1.printStackTrace();   
50.         }   
51.     }   
52. }  

package xmldom;

import java.io.*;
import java.util.*;
import org.jdom.*;
import org.jdom.input.SAXBuilder;
import org.jdom.output.XMLOutputter;

/**
 * xml的增删改查之SAXBuilder
 * 
 * @author Administrator
 * 
 */
public class XmlTest {

 // 查询所有的数据
 public static void list() throws JDOMException, IOException {
  SAXBuilder builder = new SAXBuilder();
  String xmlPath = "./src/xmldom/message.xml";
  //String xmlPath = "./WebRoot/xml/message.xml";
  // 获得文档对象
  Document document = builder.build(xmlPath);
  // 获得根节点
  Element root = document.getRootElement();
  List list = root.getChildren();
  System.out.println("root : " + root);
  System.out.println("root.getName : "+root.getName());
  System.out.println("listSize : "+list.size());
  Iterator it = list.iterator();
  while (it.hasNext()) {
   Element e = (Element) it.next();
   System.out.println("ID: " + e.getAttributeValue("id"));
   System.out.println("childUsername:"+e.getChildText("username"));
   System.out.println("childPassword:"+e.getChildText("password"));
  }
  
  //for(int i=0;i<list.size();i++){
  // Element e = (Element)list.get(i);
  // ...
  //}
 }
 public static void main(String[] args) {
  try {
   XmlTest.list();
  } catch (JDOMException e1) {
   e1.printStackTrace();
  } catch (IOException e1) {
   e1.printStackTrace();
  }
 }
}

结果：

Java代码

1. root : [Element: <root/>]   
2. root.getName : root   
3. listSize : 2  
4. ID: 1  
5. childUsername:admin   
6. childPassword:password1   
7. ID: 2  
8. childUsername:manager   
9. childPassword:password2  

root : [Element: <root/>]
root.getName : root
listSize : 2
ID: 1
childUsername:admin
childPassword:password1
ID: 2
childUsername:manager
childPassword:password2

3.在原有的xml文件中增加数据

Java代码

1. public static void add() throws JDOMException, FileNotFoundException,IOException {   
2.     SAXBuilder builder = new SAXBuilder();   
3.     String xmlPath = "./src/xmldom/message.xml";   
4.     Document document = builder.build(xmlPath);   
5.        
6.     //获得根节点   
7.     Element root = document.getRootElement();   
8.        
9.     //创建节点person   
10.     Element element = new Element("person");   
11.        
12.     //给person节点添加属性id   
13.     element.setAttribute("id", "3");   
14.        
15.     //给person节点添加子节点并赋值   
16.     element.addContent(new Element("username").setText("hello"));   
17.     element.addContent(new Element("password").setText("woerld"));   
18.        
19.     //给父节点添加person子节点   
20.     root.addContent(element);   
21.   
22.     XMLOutputter output = new XMLOutputter();   
23.     output.output(document, new FileOutputStream(xmlPath));   
24. }   
25.    

 public static void add() throws JDOMException, FileNotFoundException,IOException {
  SAXBuilder builder = new SAXBuilder();
  String xmlPath = "./src/xmldom/message.xml";
  Document document = builder.build(xmlPath);
  
  //获得根节点
  Element root = document.getRootElement();
  
  //创建节点person
  Element element = new Element("person");
  
  //给person节点添加属性id
  element.setAttribute("id", "3");
  
  //给person节点添加子节点并赋值
  element.addContent(new Element("username").setText("hello"));
  element.addContent(new Element("password").setText("woerld"));
  
  //给父节点添加person子节点
  root.addContent(element);

  XMLOutputter output = new XMLOutputter();
  output.output(document, new FileOutputStream(xmlPath));
 }
  

测试：

Java代码

1. XmlTest.add();  

XmlTest.add();

结果生成新的xml文件：

Java代码

1. <?xml version="1.0" encoding="UTF-8"?>   
2. <root>   
3.     <person id="1">   
4.         <username>admin</username>   
5.         <password>password1</password>   
6.     </person>   
7.     <person id="2">   
8.         <username>manager</username>   
9.         <password>password2</password>   
10.     </person>   
11.     <person id="3">   
12.         <username>hello</username>   
13.         <password>woerld</password>   
14.     </person>   
15. </root>  

<?xml version="1.0" encoding="UTF-8"?>
<root>
 <person id="1">
  <username>admin</username>
  <password>password1</password>
 </person>
 <person id="2">
  <username>manager</username>
  <password>password2</password>
 </person>
 <person id="3">
  <username>hello</username>
  <password>woerld</password>
 </person>
</root>

4.修改xml中数据
a.修改前xml文件：

Java代码

1. <?xml version="1.0" encoding="UTF-8"?>   
2. <root>   
3.     <person id="1">   
4.         <username ip="1111111">admin</username>   
5.         <password>admin</password>   
6.     </person>   
7.     <person id="2">   
8.         <username>manager</username>   
9.         <password>password2</password>   
10.     </person>   
11.     <person id="3">   
12.         <username>hello</username>   
13.         <password>woerld</password>   
14.     </person>   
15. </root>  

<?xml version="1.0" encoding="UTF-8"?>
<root>
 <person id="1">
  <username ip="1111111">admin</username>
  <password>admin</password>
 </person>
 <person id="2">
  <username>manager</username>
  <password>password2</password>
 </person>
 <person id="3">
  <username>hello</username>
  <password>woerld</password>
 </person>
</root>

b.调用方法：

Java代码

1. public static void edit(int id) throws JDOMException,   
2.             FileNotFoundException, IOException {   
3.         SAXBuilder builder = new SAXBuilder();   
4.         Document document = builder.build("./src/xmldom/message.xml");   
5.         Element root = document.getRootElement();   
6.   
7.         List list = root.getChildren();   
8.         Iterator it = list.iterator();   
9.         for (int i = 0; i < list.size(); i++) {   
10.             Element e = (Element) it.next();   
11.             System.out.println("==============" + e.getAttributeValue("id"));   
12.             if (Integer.parseInt(e.getAttributeValue("id")) == id) {   
13.                 e.getChild("username").setText("xiaoma");   
14.                 e.getChild("username").setAttribute("ip", "66666666666");   
15.                 e.getChild("password").setText("xiaoma");   
16.   
17.             }   
18.         }   
19.         XMLOutputter output = new XMLOutputter();   
20.         output.output(document,   
21.                 new FileOutputStream("./src/xmldom/message.xml"));   
22.     }  

public static void edit(int id) throws JDOMException,
   FileNotFoundException, IOException {
  SAXBuilder builder = new SAXBuilder();
  Document document = builder.build("./src/xmldom/message.xml");
  Element root = document.getRootElement();

  List list = root.getChildren();
  Iterator it = list.iterator();
  for (int i = 0; i < list.size(); i++) {
   Element e = (Element) it.next();
   System.out.println("==============" + e.getAttributeValue("id"));
   if (Integer.parseInt(e.getAttributeValue("id")) == id) {
    e.getChild("username").setText("xiaoma");
    e.getChild("username").setAttribute("ip", "66666666666");
    e.getChild("password").setText("xiaoma");

   }
  }
  XMLOutputter output = new XMLOutputter();
  output.output(document,
    new FileOutputStream("./src/xmldom/message.xml"));
 }

c.测试：

Java代码

1. XmlTest.edit(1);  

XmlTest.edit(1);

d.执行后的xml文件：

Java代码

1. <?xml version="1.0" encoding="UTF-8"?>   
2. <root>   
3.     <person id="1">   
4.         <username ip="66666666666">xiaoma</username>   
5.         <password>xiaoma</password>   
6.     </person>   
7.     <person id="2">   
8.         <username>manager</username>   
9.         <password>password2</password>   
10.     </person>   
11.     <person id="3">   
12.         <username>hello</username>   
13.         <password>woerld</password>   
14.     </person>   
15. </root>  

<?xml version="1.0" encoding="UTF-8"?>
<root>
 <person id="1">
  <username ip="66666666666">xiaoma</username>
  <password>xiaoma</password>
 </person>
 <person id="2">
  <username>manager</username>
  <password>password2</password>
 </person>
 <person id="3">
  <username>hello</username>
  <password>woerld</password>
 </person>
</root>

5.删除xml中记录
a.删除前xml文件如上
b.执行方法：

Java代码

1. public static void del(int id) throws JDOMException, FileNotFoundException,   
2.             IOException {   
3.         SAXBuilder builder = new SAXBuilder();   
4.         Document document = builder.build("./src/xmldom/message.xml");   
5.         Element root = document.getRootElement();   
6.   
7.         List list = root.getChildren();   
8.         Iterator it = list.iterator();   
9.   
10.         for (int i = 0; i < list.size(); i++) {   
11.             Element e = (Element) it.next();   
12.             if (Integer.parseInt(e.getAttributeValue("id")) == id) {   
13.                 root.removeContent(e);   
14.                 break;   
15.             }   
16.         }   
17.         // 文件处理   
18.         XMLOutputter out = new XMLOutputter();   
19.         out.output(document, new FileOutputStream("./src/xmldom/message.xml"));   
20.     }  

public static void del(int id) throws JDOMException, FileNotFoundException,
   IOException {
  SAXBuilder builder = new SAXBuilder();
  Document document = builder.build("./src/xmldom/message.xml");
  Element root = document.getRootElement();

  List list = root.getChildren();
  Iterator it = list.iterator();

  for (int i = 0; i < list.size(); i++) {
   Element e = (Element) it.next();
   if (Integer.parseInt(e.getAttributeValue("id")) == id) {
    root.removeContent(e);
    break;
   }
  }
  // 文件处理
  XMLOutputter out = new XMLOutputter();
  out.output(document, new FileOutputStream("./src/xmldom/message.xml"));
 }

c.测试：

Java代码

1. XmlTest.del(3);  

XmlTest.del(3);

d.执行后xml文件：

Java代码

1. <?xml version="1.0" encoding="UTF-8"?>   
2. <root>   
3.     <person id="1">   
4.         <username ip="66666666666">xiaoma</username>   
5.         <password>xiaoma</password>   
6.     </person>   
7.     <person id="2">   
8.         <username>manager</username>   
9.         <password>password2</password>   
10.     </person>   
11.        
12. </root>