XML与Java之间相互转换(1.Java对象转换成XML（Marshaller） 2.XML转换成java对象（Unmarshaller） )

Posted 2021-01-04 grain-of-wood

import javax.xml.bind.annotation.XmlRootElement;

//根元素 
@XmlRootElement

public class Article { private String title; private String author; private String email; private String date;

//toString 方法用于将对象里面的内容一一列出 

    @Override
    public String toString() {
        return "Article [title=" + title + ", author=" + author + ", email=" + email + ", date=" + date + "]";
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getDate() {
        return date;
    }

    public void setDate(String date) {
        this.date = date;
    }
}

import java.io.File;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
//将java对象转换成XML
public class JAXBArticle {
    public static void main(String[] args) throws JAXBException {
        //创建xml文档对象，保存路径为E:\test.xml
        File file=new File("D:\test.xml");
        //声明JAXBContext上下文对象

     JAXBContext context=JAXBContext.newInstance(Article.class);
        //通过上下文对象创建java转换成xml的对象Marshaller；
        Marshaller m=context.createMarshaller();
        //创建xml中需要的数据
        Article article=new Article();
        article.setTitle("小王子");
        article.setAuthor("安托万·德·圣·埃克苏佩");
        article.setDate("20180901");
        article.setEmail("[email protected]");
        //将java对象转换成XML
        m.marshal(article,file);
        System.out.println(article);
    }
}

import java.io.File;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
//将XML转换成 java
public class JAXBAticleXML {

        public static void main(String[] args) throws JAXBException {
            //创建文档对象在D盘中找到test.xml文件
            File file=new File("D:\test.xml");
            //声明JAXBContext上下文对象
            JAXBContext context=JAXBContext.newInstance(Article.class);
            //通过上下文对象创建能将xml文件转换成java的Unmarshaller()对象
            Unmarshaller u=context.createUnmarshaller();
            //将xml文件转换成java
            Article article=(Article) u.unmarshal(file);
            //toString方法使用前后article的区别
            System.out.println(article);
        }
    }