JAXB之helloworld

  JAXB是将JAVA对象序列化为XML,XML反序列化为JAVA对象的好东西,在JDK 1.6中,
已经自带了,不用另外再下载包,如果是小于1.6,则需要到这里下载(http://jaxb.java.net/),本文复习下简单的JAXB.

1 一个POJO对象,将set方法用annotation打上注释即可
  

import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
 
@XmlRootElement
public class Customer {
 
	String name;
	int age;
	int id;
 
	public String getName() {
		return name;
	}
 
	@XmlElement
	public void setName(String name) {
		this.name = name;
	}
 
	public int getAge() {
		return age;
	}
 
	@XmlElement
	public void setAge(int age) {
		this.age = age;
	}
 
	public int getId() {
		return id;
	}
 
	@XmlAttribute
	public void setId(int id) {
		this.id = id;
	}

2 序列化程序
   

   import java.io.File;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
 
public class JAXBExample {
	public static void main(String[] args) {
 
	  Customer customer = new Customer();
	  customer.setId(100);
	  customer.setName("mkyong");
	  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();
	      }
 
	}

输出:
   <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<customer id="100">
    <age>29</age>
    <name>mkyong</name>
</customer>

3 反过来序列化
   
import java.io.File;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
 
public class JAXBExample {
	public static void main(String[] args) {
 
	 try {
 
		File file = new File("C:\\file.xml");
		JAXBContext jaxbContext = JAXBContext.newInstance(Customer.class);
 
		Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
		Customer customer = (Customer) jaxbUnmarshaller.unmarshal(file);
		System.out.println(customer);
 
	  } catch (JAXBException e) {
		e.printStackTrace();
	  }
 
	}
}