SpringMVC 中整合JSON

SpringMVC 中整合JSON、XML视图二

上篇文章介绍了程序整合的准备工作、结合MarshallingView视图完成jaxb2转换XML、xStream转换XML工作，这次将介绍castor、jibx转换XML。

还有MappingJacksonView用Jackson转换JSON，自己拓展AbstractView定义Jsonlib 的视图完成JSON-lib转换JSON。

上一篇文章：https://www.doczj.com/doc/a06142816.html,/hoojo/archive/2011/04/29/2032571.html

四、用Castor转换XML

1、castor可以通过一个mapping.xml文件对即将转换的Java对象进行描述，然后可以将Java对象按照描述的情况输出XML内容。利用castor转换xml需要添加如下jar包：

如果你还不清楚castor，可以阅读：

for csblogs：https://www.doczj.com/doc/a06142816.html,/hoojo/archive/2011/04/25/2026819.html for csdn：https://www.doczj.com/doc/a06142816.html,/IBM_hoojo/archive/2011/04/25/6360916.aspx

2、你需要在dispatcher.xml中添加castor的相关视图，配置如下：

<--

继承MarshallingView，重写locateToBeMarshalled方法；

解决对象添加到ModelAndView中，转换后的xml是BindingResult信息的bug -->

class="com.hoo.veiw.xml.OverrideMarshallingView">

classpath:mapping.xml

mapping.xml配置

auto-naming="deriveByClass"/>

type="com.hoo.entity.Account">

type="com.hoo.entity.Account">

关于mapping.xml配置的介绍，你可以参考

https://www.doczj.com/doc/a06142816.html,/hoojo/archive/2011/04/25/2026819.html

这篇文章的第三栏目。

3、在使用Spring的MarshallingView的时候，转换的xml结果有时候会带有BindingResult 对象的信息。所以解决办法是重写MarshallingView里面的locateToBeMarshalled方法，这样就可以解决了。下面是重新MarshallingView的class代码：

package com.hoo.veiw.xml;

import java.util.Map;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.BeansException;

import org.springframework.oxm.Marshaller;

import org.springframework.validation.BindingResult;

import org.springframework.web.servlet.view.xml.MarshallingView;

/**

* function:继承MarshallingView，重写locateToBeMarshalled方法；

* 解决对象添加到ModelAndView中，转换后的xml是BindingResult信息的bug

* @author hoojo

* @createDate 2010-11-29 下午05:58:45

* @file OverrideMarshallingView.java

* @package com.hoo.veiw.xml

* @project Spring3

* @blog https://www.doczj.com/doc/a06142816.html,/IBM_hoojo

* @email hoojo_@https://www.doczj.com/doc/a06142816.html,

* @version 1.0

*/

public class OverrideMarshallingView extends MarshallingView { private Marshaller marshaller;

private String modelKey;

public OverrideMarshallingView() {

super();

}

public OverrideMarshallingView(Marshaller marshaller) {

super(marshaller);

this.marshaller = marshaller;

}

public void setMarshaller(Marshaller marshaller) {

super.setMarshaller(marshaller);

this.marshaller = marshaller;

}

public void setModelKey(String modelKey) {

super.setModelKey(modelKey);

this.modelKey = modelKey;

}

@Override

protected void initApplicationContext() throws BeansException { super.initApplicationContext();

}

@SuppressWarnings("unchecked")

@Override

protected void renderMergedOutputModel(Map model, HttpServletRequest request, HttpServletResponse response)

throws Exception {

super.renderMergedOutputModel(model, request, response);

}

@SuppressWarnings("unchecked")

@Override

protected Object locateToBeMarshalled(Map model) throws ServletException {

if (modelKey != null) {

Object o = model.get(modelKey);

if (!this.marshaller.supports(o.getClass())) {

throw new ServletException("Model object [" + o + "] retrieved via key [" + modelKey

+ "] is not supported by the Marshaller");

}

return o;

}

for (Object o : model.values()) {

//解决对象添加到ModelAndView中，转换后的xml是BindingResult信息的bug

if (o instanceof BindingResult) {

continue;

}

if (this.marshaller.supports(o.getClass())) {

return o;

}

}

return null;

}

}

4、下面来看看Castor来转换普通JavaBean

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.Brithday;

import com.hoo.entity.ListBean;

import com.hoo.entity.MapBean;

import https://www.doczj.com/doc/a06142816.html,er;

/**

* function:利用MarshallingView视图，配置CastorMarshaller将Java 对象转换XML

* @author hoojo

* @createDate 2011-4-28 上午10:14:43

* @file CastorMarshallingViewController.java

* @package com.hoo.controller

* @project SpringMVC4View

* @blog https://www.doczj.com/doc/a06142816.html,/IBM_hoojo

* @email hoojo_@https://www.doczj.com/doc/a06142816.html,

* @version 1.0

*/

@Controller

@RequestMapping("/castor/view")

public class CastorMarshallingViewController {

@RequestMapping("/doBeanXMLCastorView")

public ModelAndView doBeanXMLCastorView() {

System.out.println("#################ViewController doBeanXMLCastorView##################");

ModelAndView mav = new ModelAndView("castorMarshallingView"); 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);

Map map = new HashMap();

map.put("day", day);

map.put("account", bean);

mav.addObject(bean);//重写MarshallingView的

locateToBeMarshalled方法

//mav.addObject(BindingResult.MODEL_KEY_PREFIX, bean);

//mav.addObject(BindingResult.MODEL_KEY_PREFIX + "account", bean);

return mav;

}

}

Account在mapping配置文件中有进行配置描述。

在浏览器中请求

http://localhost:8080/SpringMVC4View/castor/view/doBeanXMLCastorView.do

就可以看到结果了，结果如下：

hahaemail

北京

<生日brithday="2010-11-22"/>

5、转换Map集合

@RequestMapping("/doMapXMLCastorView")

public ModelAndView doMapXMLCastorView() {

System.out.println("#################ViewController doMapXMLCastorView##################");

ModelAndView mav = new ModelAndView("castorMarshallingView"); 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);

Map map = new HashMap();

map.put("day", day);

map.put("account", bean);

MapBean differ = new MapBean();

differ.setMap(map);

mav.addObject(differ);

return mav;

}

在浏览器中请求

http://localhost:8080/SpringMVC4View/castor/view/doMapXMLCastorView.do

结果如下：

id="1">hahaemail

北京

<生日brithday="2010-11-22"/>

6、转换List集合

@RequestMapping("/doListXMLCastorView")

public ModelAndView doListXMLCastorView() {

System.out.println("#################ViewController doListXMLCastorView##################");

ModelAndView mav = new ModelAndView("castorMarshallingView"); List