JAXB的使用

jaxb：Java Architecture for XML Binding

1.Bind the Schema

将XSD文件解析成javabean

在java1.5一下的版本 需要下载JAXB

在java1.6中，java已经将JAXB集成进来

此时我们只要进入到%JAVA_HOME%/bin目录下执行命令：xjc  books.xsd -p test.jaxb  -d work

其中参数-p表示Package     -d表示生产文件的Directry；

之后便会生成javabean对象

 

2、Unmarshalling an XML document 解组XML文档

javax.xml.bind.JAXBContext  是java1.6新加进来的包

JAXBContext jc = JAXBContext.newInstance("test.jaxb");    //test.jaxb是XML Schema所生成的javaBean所在的包名

Unmarshaller unmarshaller = jc.createUnmarshaller();   //创建借组程序对象

Collection collection= (Collection)    unmarshaller.unmarshal(new File( "books.xml"));     //指定借组对象  其中Collection对象是bind Schema都会生成的一个类

从该类派生的对象可以获取根节点元素，再从根节点元素获取各个子节点 从而可以获得各个节点的值

List<BookType> bookList = booksType.getBook();

 

 

for( int i = 0; i < bookList.size();i++ ) {               System.out.println("Book  details "   );               test.jaxb.BookType book =(test.jaxb.BookType) bookList.get(i);               System.out.println("Item id: " +  book.getItemId());               System.out.println("Book Name: " +  book.getName().trim());               System.out.println("Book ISBN: " +  book.getISBN());               System.out.println("Book Price: " +  book.getPrice().trim());               System.out.println("Book category: " +  book.getBookCategory());               System.out.println("Book promotion: " +  book.getPromotion().                   getDiscount().trim());                              System.out.println("No of Authors " +                     book.getAuthors().getAuthorName().size());               BookType.AuthorsType authors = book.getAuthors();               for (int j = 0; j < authors.getAuthorName().size();j++) {                  String authorName = (String) authors.getAuthorName().get(j);                  System.out.println("Author Name " + authorName.trim());               }               System.out.println();            }

 

效果 ：

Book  details Item id: 999Book Name: Learning JAXBBook ISBN: 123445Book Price: 34 $Book category: otherBook promotion: 10% on this book if purchased by March 2003No of Authors 1Author Name Jane DoeBook  details Item id: 129Book Name: Java Webservices today and BeyondBook ISBN: 522965Book Price: 29 $Book category: magazineBook promotion: Buy one get Learning webservices Part 1 freeNo of Authors 2Author Name John BrownAuthor Name Peter T.