Java Bean与xml互相转换的方法分析

本文实例讲述了java bean与xml互相转换的方法。分享给大家供大家参考，具体如下：

xml和java bean互相转换是一个很有用的功能，因为两者有着前后合作的关系，但解析的过程比较痛苦。下面介绍如何进行xml和java bean的互相转换。

最近项目中用到了xml和java bean的转换

用到xml的时候我们需要遍历解析。。。然后将解析的值放入声明好的java bean，过程很痛苦，结果很美好

我们能不能直接从xml转化到java bean呢，或者直接成java bean转化到xml呢？

答案是ok的

使用jar包：org.nuxeo.common.xmap

写个小例子

xml

				?

									<?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>

books类

				?

									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);

									  }

									}

book类

				?

									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;

									  }

									}

测试类：

				?

									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();

									    }

									  }

									}

运行上面这个类就可以生成开头所看见的那个xml的内容

解析xml

				?

									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];