java中的xml与实体类之间的映射

实体类:

 1 package xml;
 2 
 3 import javax.xml.bind.annotation.XmlRootElement;
 4 
 5 @XmlRootElement
 6 public class User {
 7     String name;
 8     String english_name;
 9     String age;
10     String sex;
11     String address;
12     String description;
13     public User(){}
14     
15     public User(String name, String english_name, String age, String sex,
16             String address, String description) {
17         this.name=name;
18         this.english_name=english_name;
19         this.age=age;
20         this.sex=sex;
21         this.address=address;
22         this.description=description;
23     }
24     public String getName() {
25         return name;
26     }
27     public void setName(String name) {
28         this.name = name;
29     }
30     public String getEnglish_name() {
31         return english_name;
32     }
33     public void setEnglish_name(String english_name) {
34         this.english_name = english_name;
35     }
36     public String getAge() {
37         return age;
38     }
39     public void setAge(String age) {
40         this.age = age;
41     }
42     public String getSex() {
43         return sex;
44     }
45     public void setSex(String sex) {
46         this.sex = sex;
47     }
48     public String getAddress() {
49         return address;
50     }
51     public void setAddress(String address) {
52         this.address = address;
53     }
54     public String getDescription() {
55         return description;
56     }
57     public void setDescription(String description) {
58         this.description = description;
59     }
60     
61     
62     
63 }

一.java对象转化成xml文件

 1 package xml;
 2 
 3 import java.io.File;
 4 
 5 import javax.xml.bind.JAXBContext;
 6 import javax.xml.bind.JAXBException;
 7 import javax.xml.bind.Marshaller;
 8 
 9 /**
10  * 将类映射成xml
11  * @author Administrator
12  *
13  */
14 public class Demo1 {
15     public static void main(String[] args) {
16         //创建xml对象,将他保存在指定位置
17         File file = new File("D:\javaItem\xml\src\xml\1.xml");
18         //申明一个JAXBContext对象
19         JAXBContext jaxbContext;
20         try {
21             //指定映射的类,创建JAXBContext对象的上下文
22             jaxbContext = JAXBContext.newInstance(User.class);
23             //创建转化对象Marshaller
24             Marshaller m = jaxbContext.createMarshaller();
25             //创建xml文件中的数据
26             User user = new User("张三", "zhangsnan", "30", "男", "安徽合肥", "软件工程师");
27             //将Java类中的User对象转化到XML
28             m.marshal(user, file);
29             System.out.println("转化完成");
30         } catch (JAXBException e) {
31             e.printStackTrace();
32         }
33     }
34 }

二.xml文件转化为java对象

 1 package xml;
 2 
 3 import java.io.File;
 4 
 5 import javax.xml.bind.JAXBContext;
 6 import javax.xml.bind.JAXBException;
 7 import javax.xml.bind.Unmarshaller;
 8 
 9 
10 
11 public class Demo2 {
12     public static void main(String[] args) {
13         File file=new File("D:\javaItem\xml\src\xml\1.xml");
14         JAXBContext jaxbContext;
15         try {
16             jaxbContext=JAXBContext.newInstance(User.class);
17             Unmarshaller u=jaxbContext.createUnmarshaller();
18             User user=(User)u.unmarshal(file);
19             System.out.println("姓名:"+user.getName());
20             System.out.println("英文名字:"+user.getEnglish_name());
21             System.out.println("年龄:"+user.getAge());
22             System.out.println("性别:"+user.getSex());
23             System.out.println("地址:"+user.getAddress());
24             System.out.println("描述:"+user.getDescription());
25         } catch (JAXBException e) {
26             e.printStackTrace();
27         }
28     }
29 }