用Castor 处理XML文档

fmms 13年前
     用Castor 处理XML文档    <br /> ——Castor可以完成Java和XML的相互转换    <br />    <br /> 前面有介绍过json-lib这个框架,在线博文:http://www.cnblogs.com/hoojo/archive/2011/04/21/2023805.html    <br />    <br /> 以及Jackson这个框架,在线博文:http://www.cnblogs.com/hoojo/archive/2011/04/22/2024628.html    <br />    <br /> 它们都可以完成Java对象到XML的转换,但是还不是那么的完善。还有XStream对JSON及XML的支持,它可以对JSON或XML的完美转换。在线博文:    <br />    <br /> http://www.cnblogs.com/hoojo/archive/2011/04/22/2025197.html    <br />    <br /> 这里将介绍Castor来完成Java对象到xml的相互转换。它是怎么样转换的?和前面不同的是castor可以用一个mapping.xml文件来描述转换后的Java对象的xml基本形态,类似于xStream的annotation,这点还是非常不错的。下面我们就来看看Castor是怎么样完成 Java对象到XML之间的相互转换吧。    <br />    <br /> 一、 准备工作    <br />    <br /> 1、 官方资源    <br />    <br /> 本示例会运用到如下依赖包(jar包):    <br />    <br />      <br />    <br /> 资源及jar包下载:http://www.castor.org/download.html    <br />    <br /> junit jar下载地址:    <br />    <br /> https://github.com/KentBeck/junit/downloads    <br />    <br /> 关于官方提供的mapping配置相关示例、文档:    <br />    <br /> http://www.castor.org/xml-mapping.html    <br />    <br /> ibm提供的castor方面的文档资料:    <br />    <br /> http://www.google.com.hk/search?hl=zh-CN&newwindow=1&safe=strict&client=aff-cs-360se&hs=Gon&biw=1349&bih=603&q=castor+site%3Awww.ibm.com%2Fdeveloperworks%2Fcn%2Fxml%2F&aq=f&aqi=&aql=&oq=    <br />    <br /> 2、 程序测试运行代码    <br />    <br />    <pre class="brush:java; toolbar: true; auto-links: false;">package com.hoo.test;   import java.io.IOException; import java.io.StringReader; import java.io.StringWriter; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import org.exolab.castor.mapping.Mapping; import org.exolab.castor.mapping.MappingException; import org.exolab.castor.xml.MarshalException; import org.exolab.castor.xml.Marshaller; import org.exolab.castor.xml.Unmarshaller; import org.exolab.castor.xml.ValidationException; import org.junit.After; import org.junit.Before; import org.junit.Test; import com.hoo.entity.Account; import com.hoo.entity.AccountArray; import com.hoo.entity.Birthday; import com.hoo.entity.ListBean; import com.hoo.entity.MapBean;   /**  * <b>function:</b>Castor完成Java对象到XML的相互转换  * 依赖jar: castor-1.3.jar  * castor-1.3-core.jar  * junit-4.8.2.jar  * log4j-1.2.16.jar  * commons-logging.jar  * @author hoojo  * @createDate 2011-4-21 下午07:57:26  * @file CastorTest.java  * @package com.hoo.test  * @project WebHttpUtils  * @blog http://blog.csdn.net/IBM_hoojo  * @email hoojo_@126.com  * @version 1.0  */ public class CastorTest {         private Account bean = null;     private Mapping mapping = new Mapping();     private StringWriter writer = null;     private StringReader reader = null;         @Before     public void init() {         bean = new Account();         bean.setAddress("北京");         bean.setEmail("email");         bean.setId(1);         bean.setName("jack");         Birthday day = new Birthday();         day.setBirthday("2010-11-22");         bean.setBirthday(day);                 try {             /**              * 加载mapping.xml,此文件是对需要转换的Java对象的配置描述,              * 即:转换后的Java对象的xml内容的转换规则              */             mapping.loadMapping(System.getProperty("user.dir") + "\\src\\mapping.xml");         } catch (IOException e) {             e.printStackTrace();         } catch (MappingException e) {             e.printStackTrace();         }     }         @After     public void destory() {         bean = null;         mapping = null;         try {             if (writer != null) {                 writer.flush();                 writer.close();             }             if (reader != null) {                 reader.close();             }         } catch (IOException e) {             e.printStackTrace();         }         System.gc();     }         public void fail(Object o) {         System.out.println(o);     }         public void failRed(Object o) {         System.err.println(o);     } }</pre>    <br />    <br /> Mapping对象可以完成Java对象到XML的编组和解组,它需要先设定一个mapping.xml,通过xml对JavaObject的描述。来完成JavaObject的编组、解组工作。    <br />    <br /> 3、 看看即将被转换的JavaEntity代码    <br />    <br /> Account    <br />    <br />    <pre class="brush:java; toolbar: true; auto-links: false;">package com.hoo.entity;   public class Account {     private int id;     private String name;     private String email;     private String address;     private Birthday birthday;         //setter、getter     @Override     public String toString() {         return this.id + "#" + this.name + "#" + this.email + "#" + this.address + "#" + this.birthday;     } }  Birthday  package com.hoo.entity;   public class Birthday {     private String birthday;         public Birthday(String birthday) {         super();         this.birthday = birthday;     }     //getter、setter     public Birthday() {}         @Override     public String toString() {         return this.birthday;     } }  AccountArray  package com.hoo.entity;   public class AccountArray {     private Account[] accounts;     private int size;     public int getSize() {         size = accounts.length;         return size;     }     public void setSize(int size) {         this.size = size;     }     public Account[] getAccounts() {         return accounts;     }     public void setAccounts(Account[] accounts) {         this.accounts = accounts;     } }  ListBean  package com.hoo.entity;   import java.util.List;   public class ListBean {     private String name;     private List list;     //setter、getter }  MapBean  package com.hoo.entity;   import java.util.Map;   public class MapBean {     private Map<String, Object> map;         public Map<String, Object> getMap() {         return map;     }     public void setMap(Map<String, Object> map) {         this.map = map;     } }</pre>    <br />    <br /> 二、 编组JavaObject到XML    <br />    <br /> 1、 将JavaBean编组,转换成XML    <br />    <br />    <pre class="brush:java; toolbar: true; auto-links: false;">/**  * <b>function:</b>将Javabean编组,转换成XML  * @author hoojo  * @createDate 2011-4-22 下午12:08:48  */ @Test public void writeBean2XML() {     writer = new StringWriter();     try {         //编组         Marshaller.marshal(bean, writer);         fail(writer);     } catch (MarshalException e) {         e.printStackTrace();     } catch (Exception e) {         e.printStackTrace();     } }</pre>    <br />    <br /> 代码很简单,通过Marshaller的marshal方法来完成Java对象到XML的编组(序列化、转换)工作。    <br />    <br /> 运行后的结果如下:    <br />    <br /> <?xml version="1.0" encoding="UTF-8"?>    <br /> <account id="1"><address>北京</address><email>email</email><name>jack</name>    <br /> <birthday><birthday>2010-11-22</birthday></birthday></account>    <br />    <br /> 2、 将List集合转换成XML    <br />    <br />    <pre class="brush:java; toolbar: true; auto-links: false;">/**  * <b>function:</b>将List转换成xml  * @author hoojo  * @createDate 2011-4-22 下午12:11:00  */ @Test public void writeList2XML() {     writer = new StringWriter();     List<Account> list = new ArrayList<Account>();     list.add(bean);     bean = new Account();     bean.setName("tom");     bean.setId(223);     list.add(bean);     try {         Marshaller.marshal(list, writer);         fail(writer);     } catch (MarshalException e) {         e.printStackTrace();     } catch (Exception e) {         e.printStackTrace();     } }</pre>    <br /> 运行后,结果如下:    <br />    <br />    <pre class="brush:xml; toolbar: true; auto-links: false;"><?xml version="1.0" encoding="UTF-8"?> <array-list> <account xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:java="http://java.sun.com" id="1" xsi:type="java:com.hoo.entity.Account"> <address>北京</address><email>email< /email><name>jack</name><birthday><birthday>2010-11-22</birthday></birthday></account> <account xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:java="http://java.sun.com" id="223" xsi:type="java:com.hoo.entity.Account"> <name>tom</name> </account> </array-list></pre>    <br />    <br /> 怎么样,List存放的是2个Account吧。    <br />    <br /> 3、 将Array数组转换成XML    <br />    <br />    <pre class="brush:java; toolbar: true; auto-links: false;">/**  * <b>function:</b>将Array数组转换成XML  * @author hoojo  * @createDate 2011-4-22 下午12:11:25  */ @Test public void writeArray2XML() {     writer = new StringWriter();     Account[] acc = new Account[2];     acc[0] = bean;     bean = new Account();     bean.setName("tom");     bean.setId(223);     acc[1] = bean;         try {         Marshaller.marshal(acc, writer);         fail(writer);     } catch (MarshalException e) {         e.printStackTrace();     } catch (Exception e) {         e.printStackTrace();     } }</pre>    <br />    <br /> 结果如下:    <br />    <br />    <pre class="brush:xml; toolbar: true; auto-links: false;"><?xml version="1.0" encoding="UTF-8"?> <array><account id="1"><address>北京</address><email>email</email& gt;<name>jack</name> <birthday><birthday>2010-11-22</birthday></birthday></account> <account id="223"><name>tom</name></account></array></pre>    <br />    <br /> 4、 转换其他Java类型    <br />    <br />    <pre class="brush:java; toolbar: true; auto-links: false;">/**  * <b>function:</b>将Java常用类型编组成xml  * @author hoojo  * @createDate 2011-4-22 下午12:11:44  */ @Test public void writeObject2XML() {     writer = new StringWriter();     try {         Marshaller.marshal(true, writer);         Marshaller.marshal(9527, writer);         Marshaller.marshal(2.2f, writer);         Marshaller.marshal(1.11d, writer);         Marshaller.marshal("lucy", writer);         Marshaller.marshal("hello castor".getBytes(), writer);         Marshaller.marshal(new char[] { 'a', 'b', 'c' }, writer);         Marshaller.marshal(new String[] { "hi", "spring", "castor" }, writer);         fail(writer);     } catch (MarshalException e) {         e.printStackTrace();     } catch (Exception e) {         e.printStackTrace();     } }</pre>    <br />    <br /> 结果如下:    <br />    <br />    <pre class="brush:xml; toolbar: true; auto-links: false;"><?xml version="1.0" encoding="UTF-8"?> <boolean>true</boolean><?xml version="1.0" encoding="UTF-8"?> <integer>9527</integer><?xml version="1.0" encoding="UTF-8"?> <float>2.2</float><?xml version="1.0" encoding="UTF-8"?> <double>1.11</double><?xml version="1.0" encoding="UTF-8"?> <string>lucy</string><?xml version="1.0" encoding="UTF-8"?> <[-b>aGVsbG8gY2FzdG9y</[-b><?xml version="1.0" encoding="UTF-8"?> <array><character>a</character><character>b</character><character>c</character></array><?xml version="1.0" encoding="UTF-8"?> <array><string>hi</string><string>spring</string><string>castor</string></array></pre>    <br /> 都是类型为节点名称,值为text。但是这里并没有出现Map,如果转换Map需要mapping进行配置。下面再慢慢道来-.-    <br />    <br /> 5、 将xml解组成JavaBean    <br />    <br />    <pre class="brush:java; toolbar: true; auto-links: false;">/**  * <b>function:</b>将XML内容,解组成JavaBean  * @author hoojo  * @createDate 2011-4-22 下午12:12:14  */ @Test public void readXML2Bean() {         String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +                     "<account id=\"1\"><address>北京</address>" +                     "<name>jack</name><email>email</email>" +                     "<birthday><birthday>2010-11-22</birthday></birthday></account>";     reader = new StringReader(xml);         try {         //解组         Account account = (Account) Unmarshaller.unmarshal(Account.class, reader);         fail(account);     } catch (MarshalException e) {         e.printStackTrace();     } catch (ValidationException e) {         e.printStackTrace();     } }</pre>    <br />    <br /> 结果如下:    <br />    <br /> 1#jack#email#北京#2010-11-22    <br />    <br /> 其他的类型,如:map、list、array都不能成功解组。因为这些类型里面有很多系统默认的xml描述。但是利用mapping和自定义JavaBean就可以成功编组和解组了。下面看看mapping是怎么玩转这些类型的。    <br />    <br /> 三、 利用mapping配置,编组JavaObject、解组XML    <br />    <br /> 最开始的init方法就提供了mapping,让我们对mapping这个配置有了大概的了解。下面我们将详细介绍mapping是个什么:    <br />    <br /> 1、 在此之前我们设置过mapping.xml。如果不设置,肯定是不能转换成我们想要的XML的。那么,mapping.xml配置文件是怎么配置Account这个对象的呢?    <br />    <br /> mapping.xml配置如下:    <br />    <br />    <pre class="brush:xml; toolbar: true; auto-links: false;"><?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE mapping PUBLIC "-//EXOLAB/Castor Mapping DTD Version 1.0//EN" "http://castor.org/mapping.dtd"> <mapping>     <class name="com.hoo.entity.Account" auto-complete="true">           <map-to xml="Account"/>           <field name="id" type="integer">             <bind-xml name="id" node="attribute" />         </field>           <field name="name" type="string">             <bind-xml name="name" node="element" />         </field>           <field name="email" type="string">             <bind-xml name="email" node="element" />         </field>           <field name="address" type="string">             <bind-xml name="address" node="element" />         </field>           <field name="birthday" type="com.hoo.entity.Birthday">             <bind-xml name="生日" node="element" />         </field>     </class>       <class name="com.hoo.entity.Birthday">         <map-to xml="birthday" />           <field name="birthday" type="string">             <bind-xml name="birthday" node="attribute" />         </field>     </class> </mapping></pre>    <br />    <br /> 首先,看看这个xml文档的根元素是mapping,在mapping中可以配置class。也就是我们要转换的JavaObject的配置描述了。    <br />    <br /> class元素的name属性就是配置的JavaObject的classpath路径了。    <br />    <br /> 关于class元素的auto-complate属性,如果这个属性的值为ture。那么编组后的xml,castor会自动给没有在mapping配置文件进行配置的属性自动编组(转换)到xml中。如果为false,那么在mapping配置文件中出现的属性将在编组后不现在在编组后的xml中。    <br />    <br /> map-to就是当前class编组后的xml文档的节点元素名称。    <br />    <br /> field就是描述JavaObject中的属性,name是Java对象的属性名称,type是类型。关于配置的type类型也有规定,你可以参考:http://www.castor.org/xml-mapping.html的field配置讲解。    <br />    <br /> 而field还有其他的属性配置,如get-method应该是getter方法、set-method应该是setter的方法、has-mehtod 应该是hashCode方法,有时候我们不一定要提高getter、setter方法,我们需要用自己的方法名称来代替setter、getter。如果当前field配置的是集合类型,那么你需要给field元素配置collection属性。    <br />    <br /> bind-xml就是绑定(编组)成xml后的xml内容的描述,name就是编组后xml的节点元素名称,node有2个值,分别是 attribute、element。attribute是属性,它会在节点元素的属性中显示,例如:<account id=”2”></account>    <br />    <br /> 而element则是单独的一个元素,例如:<account><id>2</id></account>    <br />    <br /> 就这个样子的。    <br />    <br /> mapping.xml还可以有其他标签,如:    <br />    <br /> <include href="other_mapping_file.xml"/>    <br />    <br /> 导入外部xml文件,可以分多个配置。    <br />    <br /> 好了,先将这么多的mapping方面的内容。我们还是看看实际运行的示例吧,代码如下:    <br />    <br /> /**    <br />  * <b>function:</b>将XML内容解组成Java对象    <br />  * @author hoojo    <br />  * @createDate 2011-4-22 下午12:13:28    <br />  */    <br /> @Test    <br /> public void bean4Mapping2XML() {    <br />     writer = new StringWriter();    <br />     try {    <br />         //编组    <br />         Marshaller mar = new Marshaller(writer);    <br />         mar.setMapping(mapping);    <br />         mar.marshal(bean);    <br />         fail(writer);    <br />            <br />         //解组    <br />         reader = new StringReader(writer.toString());    <br />         Unmarshaller unmar = new Unmarshaller(Account.class);    <br />         unmar.setMapping(mapping);    <br />            <br />         Account account = (Account) unmar.unmarshal(reader);    <br />         fail(account);    <br />     } catch (MarshalException e) {    <br />         e.printStackTrace();    <br />     } catch (Exception e) {    <br />         e.printStackTrace();    <br />     }    <br /> }    <br />    <br /> 运行后结果如下:    <br />    <br /> <?xml version="1.0" encoding="UTF-8"?>    <br /> <Account id="1"><name>jack</name><email>email</email>& lt;address>北京</address><生日 birthday="2010-11-22"/></Account>    <br /> 1#jack#email#北京#2010-11-22    <br />    <br /> 上面的xml的根节点是Account,这个功劳就来源于mapping配置中的map-to元素,而根节点的id属性是有field和bind-xml 来完成的。当bind-xml的node值为attribute时,就会以属性的方式显示。当node为element时,就会像后面name、 email一样,以元素名称显示。    <br />    <br /> 再看看上面的mapping文件中的Account的配置,有个auto-complate属性,如果把这个属性的值设置成false,会怎么样?那我们赶紧试试。    <br />    <br /> 没有发现上面异样,但是当我们删除下面配置的filed的时候,就发现有变化了。    <br />    <br /> 结果如下:    <br />    <br /> <?xml version="1.0" encoding="UTF-8"?>    <br /> <Account><name>jack</name><email>email< /email><address>北京</address><生日 birthday="2010-11-22"/></Account>    <br /> 0#jack#email#北京#2010-11-22    <br />    <br /> 发现id没有显示在xml中,那么我们再将auto-complate的属性设置true,会有什么惊喜?    <br />    <br /> 结果如下:    <br />    <br /> <?xml version="1.0" encoding="UTF-8"?>    <br /> <Account id="1"><name>jack</name><email>email</email>& lt;address>北京</address><生日 birthday="2010-11-22"/></Account>    <br /> 1#jack#email#北京#2010-11-22    <br />    <br /> 发现id又回来了,但是Account的配置中并没有配置id的field。这是为什么,其实auto-comlate在上面已经讲过了。Castor在编组时会自动将int类型的属性,显示在父元素的属性中。并且JavaObject中有的属性没有在mapping配置文件中配置,castor也会自动将其编组在xml中。    <br />    <br /> 下面我们看看map-to配置的用法,map-to的主要属性是name,也就是我们把当前根元素重命名的名称。Map-to还有2个属性可以用,分别是 ns-uri、ns-prefix。看名称就知道它大概的意识,一个是命名空间的uri另一个则是命名空间的前缀。我们给上面mapping加上这两个属性看看。    <br />    <br /> <map-to xml="Account" ns-uri="http://hoojo.cnblogs.com" ns-prefix="castor"/>    <br />    <br /> 结果如下:    <br />    <br /> <?xml version="1.0" encoding="UTF-8"?>    <br /> <castor:Account xmlns:castor="http://hoojo.cnblogs.com" id="1"><castor:name>jack</castor:name><castor:email>email</castor:email>    <br /> <castor:address>北京</castor:address><castor:生日 birthday="2010-11-22"/></castor:Account>    <br /> 1#jack#email#北京#2010-11-22    <br />    <br /> 发现了什么?节点元素都带上了ns-prefix的值,而根元素则有了xml的ns。    <br />    <br /> 2、 将一段XML格式字符串转换成JavaBean    <br />    <br /> @Test    <br /> public void readBean4Mapping2XML() {    <br />     String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +    <br />                 "<Account id=\"2241\"><name>jack</name><email>email< /email><address>北京</address><生日 birthday=\"2010-11-22\"/></Account>";    <br />     try {    <br />         reader = new StringReader(xml);    <br />         Unmarshaller unmar = new Unmarshaller(Account.class);    <br />         unmar.setMapping(mapping);    <br />            <br />         Account account = (Account) unmar.unmarshal(reader);    <br />         fail(account);    <br />     } catch (MarshalException e) {    <br />         e.printStackTrace();    <br />     } catch (Exception e) {    <br />         e.printStackTrace();    <br />     }    <br /> }    <br />    <br /> 运行后结果如下:    <br />    <br /> 2241#jack#email#北京#2010-11-22    <br />    <br /> 3、 将XML内容解组成Java的Array    <br />    <br /> /**    <br />  * <b>function:</b>将XML内容解组成Java的Array    <br />  * @author hoojo    <br />  * @createDate 2011-4-22 下午12:14:50    <br />  */    <br /> @Test    <br /> public void array4Mapping2XML() {    <br />     writer = new StringWriter();    <br />     Account[] acc = new Account[2];    <br />     acc[0] = bean;    <br />     bean = new Account();    <br />     bean.setName("tom");    <br />     bean.setId(223);    <br />     acc[1] = bean;    <br />     AccountArray array = new AccountArray();    <br />     array.setAccounts(acc);    <br />     try {    <br />         Marshaller mar = new Marshaller(writer);    <br />         mar.setMapping(mapping);    <br />         mar.marshal(array);    <br />         fail(writer);    <br />            <br />         reader = new StringReader(writer.toString());    <br />         Unmarshaller unmar = new Unmarshaller(AccountArray.class);    <br />         unmar.setMapping(mapping);    <br />         array = (AccountArray) unmar.unmarshal(reader);    <br />         fail(array.getSize());    <br />         fail(array.getAccounts()[0]);    <br />         fail(array.getAccounts()[1]);    <br />     } catch (MarshalException e) {    <br />         e.printStackTrace();    <br />     } catch (Exception e) {    <br />         e.printStackTrace();    <br />     }    <br /> }    <br />    <br /> AccountArray的mapping配置如下:    <br />    <br /> <class name="com.hoo.entity.AccountArray">    <br />     <map-to xml="account-array"/>    <br />     <field name="size" type="int" />    <br />     <field name="accounts" collection="array" type="com.hoo.entity.Account">    <br />         <bind-xml name="accounts" auto-naming="deriveByClass"/>    <br />     </field>    <br /> </class>    <br />    <br /> collection表示是数组,auto-maming有2中值,一种是类driverByClass,另一种则是driverByField是属性。    <br />    <br /> 运行后,结果如下:    <br />    <br /> <?xml version="1.0" encoding="UTF-8"?>    <br /> <account-array><size>2</size><Account id="1"><name>jack</name><email>email</email>& lt;address>北京</address>    <br /> <生日 birthday="2010-11-22"/></Account><Account id="223"><name>tom</name></Account></account-array>    <br /> 2    <br /> 1#jack#email#北京#2010-11-22    <br /> 223#tom#null#null#null    <br />    <br /> 4、 将Map编组、解组成JavaObject    <br />    <br /> /**    <br />  * <b>function:</b>xml转换成Java的Map    <br />  * @author hoojo    <br />  * @createDate 2011-4-22 下午12:15:18    <br />  */    <br /> @Test    <br /> public void map4Mapping2XML() {    <br />     writer = new StringWriter();    <br />     MapBean mapBean = new MapBean();    <br />     Map<String, Object> map = new HashMap<String, Object>();    <br />     map.put("No1", bean);    <br />     bean = new Account();    <br />     bean.setName("tom");    <br />     bean.setId(223);    <br />     map.put("No2", bean);    <br />     mapBean.setMap(map);    <br />        <br />     try {    <br />         Marshaller mar = new Marshaller(writer);    <br />         mar.setMapping(mapping);    <br />         mar.marshal(mapBean);    <br />         fail(writer);    <br />            <br />         reader = new StringReader(writer.toString());    <br />         Unmarshaller unmar = new Unmarshaller(MapBean.class);    <br />         unmar.setMapping(mapping);    <br />         mapBean = (MapBean) unmar.unmarshal(reader);    <br />         fail(mapBean.getMap());    <br />     } catch (MarshalException e) {    <br />         e.printStackTrace();    <br />     } catch (Exception e) {    <br />         e.printStackTrace();    <br />     }    <br /> }    <br />    <br /> Mapping配置    <br />    <br /> <class name="com.hoo.entity.MapBean">    <br />     <field name="map" collection="map">    <br />         <bind-xml name="map">    <br />             <class name="org.exolab.castor.mapping.MapItem">    <br />                 <field name="key" type="java.lang.String">    <br />                     <bind-xml name="key" node="attribute" />    <br />                 </field>    <br />                 <field name="value" type="com.hoo.entity.Account">    <br />                     <bind-xml name="value" auto-naming="deriveByClass"/>    <br />                 </field>    <br />             </class>    <br />         </bind-xml>    <br />     </field>    <br /> </class>    <br />    <br /> 上面的map配置必须这样配置,利用org.exolab.castor.mapping.MapItem这个class,完成key、value的配置。    <br />    <br /> 结果如下:    <br />    <br /> <?xml version="1.0" encoding="UTF-8"?>    <br /> <map-bean><map key="No2"><Account id="223"><name>tom</name></Account></map>    <br /> <map key="No1"><Account id="1"><name>jack</name><email>email</email>& lt;address>北京</address>    <br /> <生日 birthday="2010-11-22"/></Account></map></map-bean>    <br /> {No2=223#tom#null#null#null, No1=1#jack#email#北京#2010-11-22}    <br />    <br /> 5、 JavaList编组、解组XML    <br />    <br /> /**    <br />  * <b>function:</b>List到XML的相互转换    <br />  * @author hoojo    <br />  * @createDate 2011-4-22 下午12:16:04    <br />  */    <br /> @SuppressWarnings("unchecked")    <br /> @Test    <br /> public void listForMapping2XML() {    <br />     writer = new StringWriter();    <br />        <br />     List<Account> list = new ArrayList<Account>();    <br />     list.add(bean);    <br />     bean = new Account();    <br />     bean.setName("tom");    <br />     bean.setId(223);    <br />     list.add(bean);    <br />        <br />     ListBean listBean = new ListBean();    <br />     listBean.setList(list);    <br />     try {    <br />         Marshaller mar = new Marshaller(writer);    <br />         mar.setMapping(mapping);    <br />         mar.marshal(listBean);    <br />         fail(writer);    <br />            <br />         reader = new StringReader(writer.toString());    <br />         Unmarshaller unmar = new Unmarshaller(ListBean.class);    <br />         unmar.setMapping(mapping);    <br />         listBean = (ListBean) unmar.unmarshal(reader);    <br />         fail(listBean.getList().size());    <br />         for (Account acc : (List<Account>)listBean.getList()) {    <br />             fail(acc);    <br />         }    <br />     } catch (MarshalException e) {    <br />         e.printStackTrace();    <br />     } catch (Exception e) {    <br />         e.printStackTrace();    <br />     }    <br /> }    <br />    <br /> Mapping配置    <br />    <br /> <class name="com.hoo.entity.ListBean">    <br />     <map-to xml="listBean"/>    <br />     <field name="list" collection="arraylist" type="com.hoo.entity.Account">    <br />         <bind-xml name="beans" auto-naming="deriveByClass"/>    <br />     </field>    <br /> </class>    <br />    <br /> 结果:    <br />    <br /> <?xml version="1.0" encoding="UTF-8"?>    <br /> <listBean><Account id="1"><name>jack</name><email>email</email>& lt;address>北京</address>    <br /> <生日 birthday="2010-11-22"/></Account><Account id="223"><name>tom</name></Account></listBean>    <br /> 2    <br /> 1#jack#email#北京#2010-11-22    <br /> 223#tom#null#null#null    <br />    <br /> 原文地址:    <a href="/misc/goto?guid=4959500781943199544" target="_blank">http://www.cnblogs.com/hoojo/archive/2011/04/25/2026819.html</a>