Spring MVC的自动转换功能 HttpMessageConverter

最新推荐文章于 2024-11-14 22:01:04 发布

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最新推荐文章于 2024-11-14 22:01:04 发布

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分类专栏： springmvc 文章标签： spring mvc

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博客介绍了Spring MVC中默认启用的MVC注解功能下的多种消息转换器，包括可读写字符串的StringHttpMessageConverter、处理表单数据的FormHttpMessageConverter、读写字节数组的ByteArrayMessageConverter等，还提及了XML和JSON的转换相关转换器。

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出处：http://www.blogjava.net/wmcoo/articles/333472.html

默认起用的MVC注解功能

<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">

StringHttpMessageConverter： that can read and write Strings from the HTTP request and response.

FormHttpMessageConverter：that can read and write form data from the HTTP request and response.

ByteArrayMessageConverter：that can read and write byte arrays from the HTTP request and response.

MarshallingHttpMessageConverter：XML的转换需要使用Spring的 `Marshaller` 和 `Unmarshaller.`

MappingJacksonHttpMessageConverter：JSON的转换.

SourceHttpMessageConverter：能够读/写来自HTTP的请求与响应的javax.xml.transform.Source `,支持DOMSource`, `SAXSource`, 和 `StreamSource` 的XML格式

BufferedImageHttpMessageConverter：that can read and write `java.awt.image.BufferedImage` from the HTTP request and response

起用JSON转换功能

xml

1      
2      < bean
3          class = " org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter " >
4          < property name = " messageConverters " >
5              < util:list id = " beanList " >
6                  < ref bean = " stringHttpMessageConverter " />
7                  < ref bean = " jsonHttpMessageConverter " />
8                  < ref bean = " marshallingHttpMessageConverter " />
9              </ util:list >
10          </ property >
11      </ bean >
12
13      < bean id = " stringHttpMessageConverter "
14          class = " org.springframework.http.converter.StringHttpMessageConverter " />
15      < bean id = " jsonHttpMessageConverter "
16          class = " org.springframework.http.converter.json.MappingJacksonHttpMessageConverter " />
17      < bean id = " marshallingHttpMessageConverter "
18          class = " org.springframework.http.converter.xml.MarshallingHttpMessageConverter " >
19          < property name = " marshaller " ref = " castorMarshaller " />
20          < property name = " unmarshaller " ref = " castorMarshaller " />
21      </ bean >
22
23      < bean id = " castorMarshaller " class = " org.springframework.oxm.castor.CastorMarshaller " />
24

MappingJacksonHttpMessageConverter能够将POJO对象自动转换为JSON对象

   @RequestMapping(value = " /getPojoJson " , method = RequestMethod.GET)
     public @ResponseBody Pojo getPojoJson() {
      Pojo pojo = new Pojo();
      pojo.setA( " test " );
      pojo.setB( 1 );
      pojo.setD( new Date());
       return pojo;
    }

需要依赖JSON对象的处理JAR包
jackson-core-lgpl.jar
jackson-mapper-lgpl.jar
下载地址:
http://jackson.codehaus.org/