SpringMVC 中整合JSON、XML视图一

SpringMVC中整合了JSON、XML的视图，可以通过这些视图完成Java对象到XML、JSON的转换。转换XML提供了MarshallingView，开发者只需用注入相应的marshaller、和属性配置，即可自动完成Java的Model对象中的数据到XML的编组。

Email：hoojo_@126.com

Blog：http://blog.csdn.net/IBM_hoojo

http://hoojo.cnblogs.com/

一、 准备工作

1、 本次程序会涉及到Jackson、xStream、Jibx、Jaxb2、castor等技术，如果你对这些技术还不是很了解。建议阅读：http://www.cnblogs.com/hoojo/archive/2011/04/27/2030264.html

这篇文章中涉及到的内容应该对你有不少帮助。

2、 jar包下载

spring各版本jar下载地址：http://ebr.springsource.com/repository/app/library/detail?name=org.springframework.spring

相关的依赖包也可以在这里找到：http://ebr.springsource.com/repository/app/library

3、 至少需要以下jar包

4、 当前工程的web.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
    xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

    <-- 配置Spring核心控制器 -->
    <servlet>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/dispatcher.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>

    <-- 解决工程编码过滤器 -->
    <filter>
        <filter-name>characterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
    </filter>

    <filter-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <welcome-file-list>
      <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
</web-app>

5、 WEB-INF中的dispatcher.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:util="http://www.springframework.org/schema/util"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/mvc
    http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.0.xsd
    http://www.springframework.org/schema/util
    http://www.springframework.org/schema/util/spring-util-3.0.xsd">

    <-- 注解探测器 -->
    <context:component-scan base-package="com.hoo.controller"/>

    <-- 视图解析器，根据视图的名称new ModelAndView(name)，在配置文件查找对应的bean配置 -->
    <bean class="org.springframework.web.servlet.view.BeanNameViewResolver">
        <property name="order" value="1"/>
    </bean>

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
    </bean>
</beans>

启动后，可以看到index.jsp 没有出现异常或错误。那么当前SpringMVC的配置就成功了。

二、 利用Jaxb2编组XML

1、 Jaxb2可以完成XML和Java的相互转换，在WebService中用得较多。前面也介绍过Jaxb2 的用法。

在线博文：

For cnblogs：http://www.cnblogs.com/hoojo/archive/2011/04/26/2029011.html

For csdn：http://blog.csdn.net/IBM_hoojo/archive/2011/04/26/6363491.aspx

2、 首先在dispatcher.xml中配置Jaxb2的marshaller的视图，配置如下：

<-- xml视图,Jaxb2Marshaller,需要配置对象和对象添加Annotation xml注解，不需要添加额外的jar包 -->
<bean name="jaxb2MarshallingView" class="org.springframework.web.servlet.view.xml.MarshallingView">
    <constructor-arg>
        <bean class="org.springframework.oxm.jaxb.Jaxb2Marshaller">
            <property name="classesToBeBound">
                <array>
                    <value>com.hoo.entity.User</value>
                    <value>com.hoo.entity.AccountBean</value>
                    <value>com.hoo.entity.MapBean</value>
                    <value>com.hoo.entity.ListBean</value>
                </array>
            </property>
        </bean>
    </constructor-arg>
</bean>

Jaxb2的jar在jdk中已经包含，所以不需要添加额外的jar包。详细信息你可以参考1中的博文。上面的jaxb2MarshallingView视图的class是MarshallingView，它有一个构造器需要传递一个Marshaller。Marshaller主要完成编组，即将Java对象转换成XML的这么一个东东。我们在这个构造器中注入了Jaxb2Marshaller这个类，这个bean有一个classesToBeBound属性，这个属性是一个数组。需要将即将转换成XML的Java对象配置在这里。而且这些对象需要进行Annotation注解。

3、 创建Jaxb2MarshallingViewController，完成Java对象到XML的转换

单个JavaBean的转换，代码如下：

package com.hoo.controller;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import com.hoo.entity.AccountBean;
import com.hoo.entity.Brithday;
import com.hoo.entity.DifferBean;
import com.hoo.entity.ListBean;
import com.hoo.entity.MoreBean;
import com.hoo.entity.User;

/**
 * <b>function:</b>Jaxb2MarshallingView 视图，利用Jaxb2进行Java对象到XML的转换技术
 * @author hoojo
 * @createDate 2011-4-27 下午03:20:23
 * @file Jaxb2MarshallingViewController.java
 * @package com.hoo.controller
 * @project SpringMVC4View
 * @blog http://blog.csdn.net/IBM_hoojo
 * @email hoojo_@126.com
 * @version 1.0
 */
@Controller
@RequestMapping("/jaxb2/view")
public class Jaxb2MarshallingViewController {

    /*
     * MarshallingView Jaxb2Marshaller 需要配置转换成xml的java对象的Annotation
     */
    @RequestMapping("/doXMLJaxb2")
    public ModelAndView doXMLJaxb2View() {
        System.out.println("#################ViewController doXMLJaxb2View##################");
        ModelAndView mav = new ModelAndView("jaxb2MarshallingView");

        AccountBean bean = new AccountBean();
        bean.setAddress("address");
        bean.setEmail("email");
        bean.setId(1);
        bean.setName("haha");
        Brithday day = new Brithday();
        day.setBrithday("2010-11-22");
        bean.setBrithday(day);

        mav.addObject(bean);

        return mav;
    }
}

上面的代码的ModelAndView配置了jaxb2MarshallingView这个视图，就表示结果集会通过这个视图进行编组后显示。上面需要转换的AccountBean和Birthday对象，这些对象需要配置annotation，前面已经讲到annotation对JavaBean转换XML的作用。我们来看看AccountBean对象代码：

package com.hoo.entity;

import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "account")
public class AccountBean {
    private int id;
    private String name;
    private String email;
    private String address;
    private Brithday brithday;

    @XmlElement
    public Brithday getBrithday() {
        return brithday;
    }
    public void setBrithday(Brithday brithday) {
        this.brithday = brithday;
    }

    @XmlElement
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }

    @XmlElement
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }

    @XmlElement
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }

    @XmlElement
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return this.name + "#" + this.id + "#" + this.address + "#" + this.brithday + "#" + this.email;
    }
}

在getter方法都有部分注解，如果你想了解更多的jaxb2的相关技术，参考：http://www.cnblogs.com/hoojo/archive/2011/04/26/2029011.html

Brithday

package com.hoo.entity;

public class Brithday {
    private String brithday;

    public Brithday() {}

    public Brithday(String brithday) {
        this.brithday = brithday;
    }

    public String getBrithday() {
        return brithday;
    }

    public void setBrithday(String brithday) {
        this.brithday = brithday;
    }
}

Brithday是AccountBean中的一个属性，在AccountBean中已经注解过。这里就不需要进行注解配置。

通过浏览器请求：http://localhost:8080/SpringMVC4View/jaxb2/view/doXMLJaxb2.do

结果如下：

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<account><address>address</address><brithday><brithday>2010-11-22</brithday></brithday>
<email>email</email><id>1</id><name>haha</name></account>

4、 转换带List属性的JavaEntity

/**
 * <b>function:</b>转换带有List属性的JavaBean
 * @author hoojo
 * @createDate 2011-4-27 下午05:32:22
 * @return
 */
@RequestMapping("/doListXMLJaxb2")
public ModelAndView doListXMLJaxb2View() {
    System.out.println("#################ViewController doListXMLJaxb2View##################");
    ModelAndView mav = new ModelAndView("jaxb2MarshallingView");
    List<Object> beans = new ArrayList<Object>();
    for (int i = 0; i < 3; i++) {
        AccountBean bean = new AccountBean();
        bean.setAddress("address#" + i);
        bean.setEmail("email" + i + "@12" + i + ".com");
        bean.setId(1 + i);
        bean.setName("haha#" + i);
        Brithday day = new Brithday();
        day.setBrithday("2010-11-2" + i);
        bean.setBrithday(day);
        beans.add(bean);

        User user = new User();
        user.setAddress("china GuangZhou# " + i);
        user.setAge(23 + i);
        user.setBrithday(new Date());
        user.setName("jack#" + i);
        user.setSex(Boolean.parseBoolean(i + ""));
        beans.add(user);
    }

    ListBean list = new ListBean();
    list.setList(beans);
    mav.addObject(list);

    return mav;
}

ListBean注解过的代码

package com.hoo.entity;

import java.util.List;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElements;
import javax.xml.bind.annotation.XmlRootElement;

@SuppressWarnings("unchecked")
@XmlRootElement
public class ListBean {
    private String name;
    private List list;

    @XmlElements({
        @XmlElement(name = "user", type = User.class),
        @XmlElement(name = "account", type = AccountBean.class),
    })
    public List getList() {
        return list;
    }

    public void setList(List list) {
        this.list = list;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

通过上面的注解可以看出List中只能存储User、AccountBean对象，关于User对象的代码和AccountBean对象的是一样的，只是类名不同而已。读者可以自己添加。在WebBrowser中请求：http://localhost:8080/SpringMVC4View/jaxb2/view/doListXMLJaxb2.do

结果如下：

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<listBean>
<account><address>address#0</address><brithday><brithday>2010-11-20</brithday></brithday>
<email>email0@120.com</email><id>1</id><name>haha#0</name></account>
<user><address>china GuangZhou# 0</address><age>23</age>
<brithday>2011-04-27T17:02:38.028+08:00</brithday><name>jack#0</name><sex>false</sex></user>
<account><address>address#1</address><brithday><brithday>2010-11-21</brithday></brithday>
<email>email1@121.com</email><id>2</id><name>haha#1</name></account>
<user><address>china GuangZhou# 1</address><age>24</age>
<brithday>2011-04-27T17:02:38.028+08:00</brithday><name>jack#1</name><sex>false</sex></user>
<account><address>address#2</address><brithday><brithday>2010-11-22</brithday></brithday>
<email>email2@122.com</email><id>3</id><name>haha#2</name></account>
<user><address>china GuangZhou# 2</address><age>25</age>
<brithday>2011-04-27T17:02:38.028+08:00</brithday><name>jack#2</name><sex>false</sex></user>
</listBean>

5、 转换带有Map属性的JavaBean，Jaxb2转换Map有点复杂，先看看代码：

/**
 * <b>function:</b>转换带有Map属性的JavaBean
 * @author hoojo
 * @createDate 2011-4-27 下午05:32:42
 * @return
 */
@RequestMapping("/doMapXMLJaxb2")
public ModelAndView doMapXMLJaxb2View() {
    System.out.println("#################ViewController doMapXMLJaxb2View##################");
    ModelAndView mav = new ModelAndView("jaxb2MarshallingView");

    MapBean mapBean = new MapBean();

    HashMap<String, AccountBean> map = new HashMap<String, AccountBean>();
    AccountBean bean = new AccountBean();
    bean.setAddress("北京");
    bean.setEmail("email");
    bean.setId(1);
    bean.setName("jack");
    Brithday day = new Brithday();
    day.setBrithday("2010-11-22");
    bean.setBrithday(day);
    map.put("NO1", bean);

    bean = new AccountBean();
    bean.setAddress("china");
    bean.setEmail("tom@125.com");
    bean.setId(2);
    bean.setName("tom");
    day = new Brithday("2011-11-22");
    bean.setBrithday(day);
    map.put("NO2", bean);

    mapBean.setMap(map);

    mav.addObject(mapBean);

    return mav;
}

首先看看MapBean的代码，代码很简单就一个Map的属性。

package com.hoo.entity;

import java.util.HashMap;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
import com.hoo.util.MapAdapter;

@XmlRootElement
public class MapBean {
    private HashMap<String, AccountBean> map;

    @XmlJavaTypeAdapter(MapAdapter.class)
    public HashMap<String, AccountBean> getMap() {
        return map;
    }
    public void setMap(HashMap<String, AccountBean> map) {
        this.map = map;
    }
}

上面的代码的getMap方法设置了XmlJavaTypeAdapter这个注解，注解里面的MapAdapter是我们自己实现的，而且还要构建一个MapElements数组元素。主要是继承XmlAdapter重写里面的几个方法完成的。

MapAdapter代码

package com.hoo.util;

import java.util.HashMap;
import java.util.Map;
import javax.xml.bind.annotation.adapters.XmlAdapter;
import com.hoo.entity.AccountBean;

/**
 * <b>function:</b>AccountBean 编组、解组的XmlAdapter
 * @author hoojo
 * @createDate 2011-4-25 下午05:03:18
 * @file MyAdetper.java
 * @package com.hoo.util
 * @project WebHttpUtils
 * @blog http://blog.csdn.net/IBM_hoojo
 * @email hoojo_@126.com
 * @version 1.0
 */
public class MapAdapter extends XmlAdapter<MapElements[], Map<String, AccountBean>> {
    public MapElements[] marshal(Map<String, AccountBean> arg0) throws Exception {
        MapElements[] mapElements = new MapElements[arg0.size()];

        int i = 0;
        for (Map.Entry<String, AccountBean> entry : arg0.entrySet())
            mapElements[i++] = new MapElements(entry.getKey(), entry.getValue());

        return mapElements;
    }

    public Map<String, AccountBean> unmarshal(MapElements[] arg0) throws Exception {
        Map<String, AccountBean> r = new HashMap<String, AccountBean>();
        for (MapElements mapelement : arg0)
            r.put(mapelement.key, mapelement.value);
        return r;
    }
}

MapElements代码

package com.hoo.util;

import javax.xml.bind.annotation.XmlElement;
import com.hoo.entity.AccountBean;

/**
 * <b>function:</b> MapElements
 * @author hoojo
 * @createDate 2011-4-25 下午05:04:04
 * @file MyElements.java
 * @package com.hoo.util
 * @project WebHttpUtils
 * @blog http://blog.csdn.net/IBM_hoojo
 * @email hoojo_@126.com
 * @version 1.0
 */
public class MapElements {
    @XmlElement
    public String key;

    @XmlElement
    public AccountBean value;

    @SuppressWarnings("unused")
    private MapElements() {
    } // Required by JAXB

    public MapElements(String key, AccountBean value) {
        this.key = key;
        this.value = value;
    }
}

在浏览器中请求：http://localhost:8080/SpringMVC4View/jaxb2/view/doMapXMLJaxb2.do

结果如下：

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<mapBean><map><item><key>NO2</key><value><address>china</address>
<brithday><brithday>2011-11-22</brithday></brithday>
<email>tom@125.com</email><id>2</id><name>tom</name></value></item>
<item><key>NO1</key><value><address>北京</address><brithday><brithday>2010-11-22</brithday></brithday>
<email>email</email><id>1</id><name>jack</name></value></item></map>
</mapBean>

总结，如果你想将一些Java的基本类型转换成XML。那么你得创建一个带getter、setter方法的JavaBean。然后在Bean的getter方法进行相应的Annotation注解即可完成转换。

 

三、 利用xStream转换XML

1、 xStream可以轻易的将Java对象转换成XML、JSON，Spring整合利用xStream转换xml。需要添加xStream相关的xstream-1.3.1.jar包。 如果你对xStream不上很了解，你可以先阅读这篇文章：

For csblogs：http://www.cnblogs.com/hoojo/archive/2011/04/22/2025197.html

For csdn：http://blog.csdn.net/IBM_hoojo/archive/2011/04/22/6342386.aspx

2、 然后在dispatcher.xml中添加如下配置

<-- xml视图，XStreamMarshaller，可以转换任何形式的java对象，需要添加xStream jar包 -->
<bean name="xStreamMarshallingView" class="org.springframework.web.servlet.view.xml.MarshallingView">
    <property name="marshaller">
        <bean class="org.springframework.oxm.xstream.XStreamMarshaller">
               <--  启用annotation -->
               <property name="autodetectAnnotations" value="true"/>
               <-- 类名别名 -->
            <property name="aliases">
                <map>
                    <-- Account这个类的别名就变成了myBeans，那么转换后的xml中就是myBeans -->
                    <entry key="myBeans" value="com.hoo.entity.Account"/>
                </map>
            </property>
            <-- 基本属性别名 -->
            <property name="fieldAliases">
                <map>
                    <-- Account中的brithday这个属性 -->
                    <entry key="com.hoo.entity.Account.brithday" value="生日"/>
                </map>
            </property>
           </bean>
    </property>
</bean>

上次配置的参数有注释描述，还要没有配置的参数。如：annotatedClass、annotatedClasses是当没有配置启用annotation的时候，可以用这2个属性进行配置你指定的class启用annotation注解。streamDriver是配置驱动用的，默认可以不要驱动，你可以配置DomDriver、JSON相关的驱动。encoding是设置编码，关于XStreamMarshaller还要更多的参数配置和上面xStream 的博文中讲解的一样使用，只是通过配置，而博文中是直接在代码中写的。当然也可以通过annotation进行注解哦；如果你想了解更多xStream的用法，请你仔细阅读：http://www.cnblogs.com/hoojo/archive/2011/04/22/2025197.html

3、 普通JavaBean转换XML

package com.hoo.controller;

import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import com.hoo.entity.Account;
import com.hoo.entity.AccountArray;
import com.hoo.entity.AccountBean;
import com.hoo.entity.Brithday;
import com.hoo.entity.DifferBean;
import com.hoo.entity.ListBean;
import com.hoo.entity.MapBean;
import com.hoo.entity.MoreBean;
import com.hoo.entity.User;

/**
 * <b>function:</b>Jaxb2MarshallingView 视图，利用Jaxb2进行Java对象到XML的转换技术
 * @author hoojo
 * @createDate 2011-4-27 下午03:20:23
 * @file Jaxb2MarshallingViewController.java
 * @package com.hoo.controller
 * @project SpringMVC4View
 * @blog http://blog.csdn.net/IBM_hoojo
 * @email hoojo_@126.com
 * @version 1.0
 */
@Controller
@RequestMapping("/jaxb2/view")
public class Jaxb2MarshallingViewController {

    /*
     * MarshallingView Jaxb2Marshaller 需要配置转换成xml的java对象的Annotation
     */
    @RequestMapping("/doXMLJaxb2")
    public ModelAndView doXMLJaxb2View() {
        System.out.println("#################ViewController doXMLJaxb2View##################");
        ModelAndView mav = new ModelAndView("jaxb2MarshallingView");

        AccountBean bean = new AccountBean();
        bean.setAddress("address");
        bean.setEmail("email");
        bean.setId(1);
        bean.setName("haha");
        Brithday day = new Brithday();
        day.setBrithday("2010-11-22");
        bean.setBrithday(day);

        mav.addObject(bean);

        return mav;
    }
}

AccountBean上面的代码已经给出，这里就不重复了。值得说明的是xStream在ModelAndView中，直接用addObject方法添加时，有时候出现一些不是我们转换的对象的信息，一般是BindingResult的xml信息。解决办法就是设置addObject的key。Key设置为BindingResult.MODEL_KEY_PREFIX这样就可以了，代码上面已经给出。

在浏览器中请求：http://localhost:8080/SpringMVC4View/xStream/view/doXMLXStream.do

结果如下：

<com.hoo.entity.AccountBean><id>1</id><name>haha</name><email>email</email><address>北京</address>
<brithday><brithday>2010-11-22</brithday></brithday></com.hoo.entity.AccountBean>

4、 转换对象数组

代码如下：

/**
 * <b>function:</b>转换对象数组
 * @author hoojo
 * @createDate 2011-4-27 下午06:19:40
 * @return
 */
@RequestMapping("/doMoreXMLXStream")
public ModelAndView doMoreXMLXStreamView() {
    System.out.println("#################ViewController doMoreXMLXStreamView##################");
    ModelAndView mav = new ModelAndView("xStreamMarshallingView");
    Account[] accs = new Account[2];
    Account bean = new Account();
    bean.setAddress("北京");
    bean.setEmail("email");
    bean.setId(1);
    bean.setName("haha");
    Brithday day = new Brithday();
    day.setBrithday("2010-11-22");
    bean.setBrithday(day);
    accs[0] = bean;

    bean = new Account();
    bean.setAddress("上海");
    bean.setEmail("email");
    bean.setId(1);
    bean.setName("haha");
    day = new Brithday();
    day.setBrithday("2010-11-22");
    bean.setBrithday(day);
    accs[1] = bean;
    mav.addObject(accs);
    return mav;
}

在WebBrowser中请求http://localhost:8080/SpringMVC4View/xStream/view/doMoreXMLXStream.do

结果如下：

<myBeans-array><myBeans><id>1</id><name>haha</name><email>email</email>
<address>北京</address><生日><brithday>2010-11-22</brithday></生日></myBeans>
<myBeans><id>1</id><name>haha</name><email>email</email><address>上海</address>
<生日><brithday>2010-11-22</brithday></生日></myBeans></myBeans-array>

结果中的myBeans、生日就是在dispatcher配置文件中重命名的对象属性名称。

5、 转换Map集合

/**
 * <b>function:</b>转换Map对象
 * @author hoojo
 * @createDate 2011-4-27 下午06:19:48
 * @return
 */
@RequestMapping("/doDifferXMLXStream")
public ModelAndView doDifferXMLXStreamView() {
    System.out.println("#################ViewController doDifferXMLXStreamView##################");
    ModelAndView mav = new ModelAndView("xStreamMarshallingView");

    Account bean = new Account();
    bean.setAddress("广东");
    bean.setEmail("email");
    bean.setId(1);
    bean.setName("haha");
    Brithday day = new Brithday();
    day.setBrithday("2010-11-22");
    bean.setBrithday(day);

    User user = new User();
    user.setAddress("china GuangZhou");
    user.setAge(23);
    user.setBrithday(new Date());
    user.setName("jack");
    user.setSex(true);

    Map<String, Object> map = new HashMap<String, Object>();
    map.put("bean", bean);
    map.put("user", user);
    mav.addObject(map);
    return mav;
}

在WebBrowser中请求http://localhost:8080/SpringMVC4View/xStream/view/doDifferXMLXStream.do

结果如下：

<map><entry>
<string>bean</string><myBeans><id>1</id><name>haha</name><email>email</email>
<address>广东</address><生日><brithday>2010-11-22</brithday></生日></myBeans>
</entry><entry><string>user</string><com.hoo.entity.User><name>jack</name><age>23</age><sex>true</sex>
<address>china GuangZhou</address><brithday>2011-04-27 19:02:13.747 CST</brithday></com.hoo.entity.User>
</entry></map>

6、 转换List集合

/**
 * <b>function:</b>转换List对象
 * @author hoojo
 * @createDate 2011-4-27 下午06:20:02
 * @return
 */
@RequestMapping("/doListXMLXStream")
public ModelAndView doListXMLXStreamView() {
    System.out.println("#################ViewController doListXMLXStreamView##################");
    ModelAndView mav = new ModelAndView("xStreamMarshallingView");
    List<Object> beans = new ArrayList<Object>();
    for (int i = 0; i < 3; i++) {
        Account bean = new Account();
        bean.setAddress("北京#" + i);
        bean.setEmail("email" + i + "@12" + i + ".com");
        bean.setId(1 + i);
        bean.setName("haha#" + i);
        Brithday day = new Brithday();
        day.setBrithday("2010-11-2" + i);
        bean.setBrithday(day);
        beans.add(bean);

        User user = new User();
        user.setAddress("china GuangZhou 广州# " + i);
        user.setAge(23 + i);
        user.setBrithday(new Date());
        user.setName("jack#" + i);
        user.setSex(Boolean.parseBoolean(i + ""));
        beans.add(user);
    }

    mav.addObject(beans);
    return mav;
}

在WebBrowser中请求http://localhost:8080/SpringMVC4View/xStream/view/doListXMLXStream.do

结果如下：

<list>
<myBeans><id>1</id><name>haha#0</name><email>email0@120.com</email><address>北京#0</address><生日>
<brithday>2010-11-20</brithday></生日></myBeans>
<com.hoo.entity.User><name>jack#0</name><age>23</age><sex>false</sex><address>china GuangZhou 广州# 0</address>
<brithday>2011-04-27 19:08:40.106 CST</brithday></com.hoo.entity.User>
<myBeans><id>2</id><name>haha#1</name><email>email1@121.com</email><address>北京#1</address><生日>
<brithday>2010-11-21</brithday></生日></myBeans>
<com.hoo.entity.User><name>jack#1</name><age>24</age><sex>false</sex><address>china GuangZhou 广州# 1</address>
<brithday>2011-04-27 19:08:40.106 CST</brithday></com.hoo.entity.User>
<myBeans><id>3</id><name>haha#2</name><email>email2@122.com</email><address>北京#2</address><生日>
<brithday>2010-11-22</brithday></生日></myBeans>
<com.hoo.entity.User><name>jack#2</name><age>25</age><sex>false</sex><address>china GuangZhou 广州# 2</address>
<brithday>2011-04-27 19:08:40.106 CST</brithday></com.hoo.entity.User></list>

总结，xStream相对jaxb2要简单些。而且相对比较灵活，可以轻易的转换Java普通类型。

下次会介绍castor转换XML、jibx转换XML、Jackson转换JSON 以及自定义Jsonlib视图转换Json。