JAXB学习笔记(三)

想知道生成的xml节点名字怎么换吗，如果你看下annotation @XmlElement的源码就明白了，看这个例子

 

package cn.uyunsky.blog.xml.demo3;

import java.io.StringReader;
import java.io.StringWriter;
import java.util.Date;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;


/**
 * <p>把节点名字换换</p>
 */
@XmlRootElement(name="PERSION")
@XmlAccessorType(XmlAccessType.FIELD)
public class Persion {

	@XmlElement(name="USER_ID")
	private Integer userid;
	
	@XmlElement(name="USER_NAME")
	private String username;
	
	@XmlElement(name="BIRTHDAY")
	private Date birthday;

	public Integer getUserid() {
		return userid;
	}

	public void setUserid(Integer userid) {
		this.userid = userid;
	}

	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	public Date getBirthday() {
		return birthday;
	}

	public void setBirthday(Date birthday) {
		this.birthday = birthday;
	}

	@Override
	public String toString() {
		StringBuilder builder = new StringBuilder();
		builder.append("Persion [userid=");
		builder.append(userid);
		builder.append(", username=");
		builder.append(username);
		builder.append(", birthday=");
		builder.append(birthday);
		builder.append("]");
		return builder.toString();
	}

	public static void main(String[] args) {
		try {
			JAXBContext jaxbContext = JAXBContext.newInstance(Persion.class);
			Persion persion = new Persion();

			persion.setUserid(112);
			persion.setUsername("就不告诉你");
			persion.setBirthday(new Date());

			Marshaller marshaller = jaxbContext.createMarshaller();
			marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);

			StringWriter writer = new StringWriter();
			marshaller.marshal(persion, writer);
			String xml = writer.getBuffer().toString();
			System.out.println(xml);

			Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
			Object bean = unmarshaller.unmarshal(new StringReader(xml));
			System.out.println(bean);

		} catch (JAXBException e) {
			e.printStackTrace();
		}
	}

}

 输出结果

 

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<PERSION>
    <USER_ID>112</USER_ID>
    <USER_NAME>就不告诉你</USER_NAME>
    <BIRTHDAY>2011-09-28T11:29:28.375+08:00</BIRTHDAY>
</PERSION>

Persion [userid=112, username=就不告诉你, birthday=Wed Sep 28 11:29:28 CST 2011]

 

JAXB转换方式的实现通过annotation来处理，因此我们想要什么功能可以仔细研究下javax.xml.bind.annotation每个注释的意义，语感好的通过类名就能猜到了

java与E文一样需要好的语感的~