java对象转化成xml文件

第一步：定义将要转化的Java对象

ackage step1.wrapper;  

import javax.xml.bind.annotation.XmlAttribute;  
import javax.xml.bind.annotation.XmlElement;  
import javax.xml.bind.annotation.XmlElementWrapper;  
import javax.xml.bind.annotation.XmlRootElement;  

@XmlRootElement  
public class Customer {  
    String[] names;  
int age;  
int id;  

//使用@XmlElementWrapper注解后，将会在原xml结点上再包装一层xml 
@XmlElementWrapper(name="allnames")  
@XmlElement(name="myname")  
public String[] getNames() {  
return names;  
    }  
public void setNames(String[] names) {  
this.names = names;  
    }  

@XmlElement  
public int getAge() {  
return age;  
    }  
public void setAge(int age) {  
this.age = age;  
    }  

@XmlAttribute  
public int getId() {  
return id;  
    }  
public void setId(int id) {  
this.id = id;  
    }  

@Override  
public String toString() {  
return "Customer [id=" + id + ",names=" + names + ",age=" + age + "]";  
    }  
}  

第二步：编组

package step1.wrapper; 

import java.io.File; 
import javax.xml.bind.JAXBContext; 
import javax.xml.bind.JAXBException; 
import javax.xml.bind.Marshaller; 

//Marshaller  
public class Object2XmlDemo {  
    public static void main(String[] args) {  

        Customer customer = new Customer(); 
        customer.setId(100); 
        customer.setNames(new String[]{"name-a","name-b","name-c"}); 
        customer.setAge(29); 
        try {  
            File file = new File("C:\\file.xml"); 
            JAXBContext jaxbContext = JAXBContext.newInstance(Customer.class); 
            Marshaller jaxbMarshaller = jaxbContext.createMarshaller(); 
            // output pretty printed  
            jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true); 
            jaxbMarshaller.marshal(customer, file); 
            jaxbMarshaller.marshal(customer, System.out); 
        } catch (JAXBException e) {  
            e.printStackTrace(); 
        }  
    }  
}  

生成的xml：

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>  
<customer id="100">  
<age>29</age>  
<allnames>  
<myname>name-a</myname>  
<myname>name-b</myname>  
<myname>name-c</myname>  
</allnames>  
</customer>  

其中对于java实体类中的注解进行解释
@XmlRootElement 根节点
@XmlRootElement(name=”customer”)
可以这样表示
*@XmlElementWrappe*r
使用@XmlElementWrapper注解后，将会在原xml结点上再包装一层xml
注：@XmlElementWrapper仅允许出现在集合属性上。
@XmlElement：
该属性作为xml的element，且可以增加属性(name=”NewElementName”)，那么生成的xml串的elment的标签是NewElementName