前幾天學習了用Marshaller 來實現Java物件與xml的互轉，現在記錄一下筆記，以便以後查閱。

       Marshaller 類負責管理將 Java 內容樹序列化回 XML 資料的過程。

       話不多說，直接上程式碼。

       首先這裡需要建立兩個類  Article  和  ArticleList  ， 這就是需要序列化到XML的物件。。注意XmlRootElement註解

package object2XML;

import javax.xml.bind.annotation.XmlRootElement;

   @XmlRootElement(name="article")  
     public class Article{  
      private String title;  
      private String author;  
      private String email;  
     private String 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;
	}  
     
}  

 

package object2XML;

import java.util.ArrayList;
import java.util.List;

import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement(name="articleList")
public class ArticleList {
   List<Article> articleList = new ArrayList<Article>();

public List<Article> getArticleList() {
	return articleList;
}

public void setArticleList(List<Article> articleList) {
	this.articleList = articleList;
}
   
}
 

     然後開始Java物件和XML的互轉。。。程式碼很簡單，就不多說了。。

     首先是Object2XML

package object2XML;
import java.io.File;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
public class Object2XML {
	public static void main(String [] args){
	      File xmlFile = new File("G:\\test.xml"); 
	      JAXBContext context ;  //宣告JAXBContext上下文物件
	      try{ //通過指定的類建立上下文物件
	             context= JAXBContext.newInstance(Article.class);
	             Marshaller marshaller =context.createMarshaller();
	             Article article = new Article();
	             article.setAuthor("Jerry");
	             article.setDate("2014-9-21");
	             article.setEmail("
 
[email protected]");
	             article.setTitle("XML概述");
	             //將Java物件轉換成xml檔案
	             marshaller.marshal(article,xmlFile);
	      }catch(JAXBException e){
	             e.printStackTrace();
	      }
	}

}

         然後 XML2Object

package object2XML;

import java.io.File;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
public class XML2Object {

	/**
	 * @param args
	 * @throws JAXBException 
	 */
	public static void main(String[] args) throws JAXBException {
		// TODO Auto-generated method stub
		 JAXBContext context ;  //宣告JAXBContext上下文物件
		 File xmlFile = new File("G:\\test.xml");   
		 context =JAXBContext.newInstance(Article.class);  
		 Unmarshaller unmarshaller = context.createUnmarshaller();  
		 Article article= (Article)unmarshaller.unmarshal(xmlFile);  
		 System.out.println(article.getAuthor());
		 System.out.println(article.getDate());
		 System.out.println(article.getEmail());
		 System.out.println(article.getTitle());
		 
	}

}

        然後是List和XML的互轉。。

        List2XML

package object2XML;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;

public class List2XML {

	/**
	 * @param args
	 * @throws JAXBException 
	 */
	public static void main(String[] args) throws JAXBException {
		// TODO Auto-generated method stub
		File xmlFile = new File("G:\\test2.xml"); 
	    JAXBContext context ;  //宣告JAXBContext上下文物件
	    context= JAXBContext.newInstance(ArticleList.class);
        Marshaller marshaller =context.createMarshaller();
        ArticleList articleList = new ArticleList();
        
        Article article = new Article();
        article.setAuthor("Jerry");
        article.setDate("2014-9-21");
        article.setEmail("[email protected]");
        article.setTitle("XML概述");
        
        Article article2 = new Article();
        article2.setAuthor("Tom");
        article2.setDate("2014-10-21");
        article2.setEmail("[email protected]");
        article2.setTitle("XML概述222");
        
        List<Article> list = new ArrayList<Article> ();
        list.add(article);
        list.add(article2);
        
        articleList.setArticleList(list);
      
        //將Java物件轉換成xml檔案
        marshaller.marshal(articleList,xmlFile);
	}

}

        然後XML2List

package object2XML;

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

public class XML2List {

	/**
	 * @param args
	 * @throws JAXBException 
	 */
	public static void main(String[] args) throws JAXBException {
		// TODO Auto-generated method stub

		JAXBContext context ;  //宣告JAXBContext上下文物件
		 File xmlFile = new File("G:\\test2.xml");   
		 context =JAXBContext.newInstance(ArticleList.class);  
		 Unmarshaller unmarshaller = context.createUnmarshaller();  
		 ArticleList articleList= ( ArticleList)unmarshaller.unmarshal(xmlFile);
		 System.out.println(articleList.getArticleList().get(0).getAuthor());
		 System.out.println(articleList.getArticleList().get(1).getAuthor());
		
	}

}

        這樣就差不多完成了，最後注意一下 物件類註解那裡   @XmlRootElement(name="articleList")   這裡的name是 articleList  ，對應著從XML轉化成list的時候  ArticleList articleList= ( ArticleList)unmarshaller.unmarshal(xmlFile);    必須用相同的名字的物件來接收（articleList）， 不然會報錯的。。。

       是不是很簡單呢，小夥伴們也趕緊試試吧。。。