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

Java代码
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代码
<?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~

作者“有云的天空”

补充：软件开发 , Java ,