Spring MVC的自动转换功能 HttpMessageConverter

太过爱你忘了你带给我的痛 2022-06-04 07:15 129阅读 0赞

**Spring MVC的自动转换功能 HttpMessageConverter**  
默认起用的MVC注解功能  
  
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/][http_jackson.codehaus.org]

[http_jackson.codehaus.org]: http://jackson.codehaus.org/