Java Bean与xml互相转换的方法分析

<?xml version="1.0" encoding="UTF-8"?>
<books>
<book no="1">
<title>java是傻逼</title>
<subject>java</subject>
<subject>xml</subject>
<price>10</price>
</book>
<book no="2">
<title>c++程序设计</title>
<subject>C++</subject>
<subject>c</subject>
<price>10</price>
</book>
</books>

import java.util.ArrayList;
import java.util.List;
import org.nuxeo.common.xmap.annotation.XNodeList;
import org.nuxeo.common.xmap.annotation.XObject;
@XObject(value = "books")
public class Books {
  @XNodeList(value = "book", type = ArrayList.class, componentType = Book.class)
  private List< Book> book;
  public List< Book> getBook() {
    return book;
  }
  public void setBook(List< Book> book) {
    this.book = book;
  }
  public void addBook(Book b){
    if(book==null){
      book=new ArrayList< Book>();
    }
    book.add(b);
  }
}

import java.util.ArrayList;
import java.util.List;
import org.nuxeo.common.xmap.annotation.XNode;
import org.nuxeo.common.xmap.annotation.XNodeList;
import org.nuxeo.common.xmap.annotation.XObject;
@XObject
public class Book {
  @XNode("title")
  private String  title;
  @XNode("@no")
  private String no;
  @XNodeList(value = "subject", type = ArrayList.class, componentType = String.class)
  private List< String> subjects;
  @XNode("price")
  private int  price;
  public String getTitle() {
    return title;
  }
  public void setTitle(String title) {
    this.title = title;
  }
  public List< String> getSubjects() {
    return subjects;
  }
  public void setSubjects(List< String> subjects) {
    this.subjects = subjects;
  }
  public int getPrice() {
    return price;
  }
  public void setPrice(int price) {
    this.price = price;
  }
  public String getNo() {
    return no;
  }
  public void setNo(String no) {
    this.no = no;
  }
}

import java.util.ArrayList;
import java.util.List;
import org.nuxeo.common.xmap.XMap;
public class XmapTest {
  public static void main(String[] args) {
    try {
      //声明一组书的根节点
      Books books=new Books();
      //声明一本书
      Book book=new Book();
      //书的类型
      List< String> sj=new ArrayList< String>();
      sj.add("java");
      sj.add("xml");
      //设置书节点的属性
      book.setPrice(10);
      book.setTitle("java是傻逼");
      book.setSubjects(sj);
      book.setNo("1");
      //将书节点添加到跟节点
      books.addBook(book);
     //声明一本书
      Book book2=new Book();
      //书的类型
      List< String> sj2=new ArrayList< String>();
      sj2.add("C++");
      sj2.add("c");
      //设置书节点的属性
      book2.setPrice(10);
      book2.setTitle("c++程序设计");
      book2.setSubjects(sj2);
      book2.setNo("2");
      //将书节点添加到跟节点
      books.addBook(book2);
      XMap xmp = new XMap();
      xmp.register(Books.class);
      List< String> filters = new ArrayList< String>();
      System.out.println(xmp.asXmlString(books, "UTF-8", filters, true));
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}

xmap.register(Books.class);
      URL url = new File("book.xml").toURL();
      InputStream in = new FileInputStream(new File("book.xml"));
      Object[] result = (Object[]) xmap.loadAll(in);
Books books=(Books)result[0];