spring mvc 3.0 json 操作中定制 http header.
大家都知道spring mvc 3.0中的JSON 响应用起来很方便的, 用@ResponseBody 标记, 然后handler 的方法的返回值设为Object. 但是现在的问题是这样不能够定制Http header.
之前有网友称使用HttpEntity. 具体怎么用我也不清楚, 只是个人感觉用起来不够优雅. 所以就有了这个文章, 经过一翻尝试. 笔者实现了定制Http 响应头中的缓存信息, 不设这个的话傻傻的IE7 会把AJAX 请求作缓存. 非常讨厌.
具体实现方法是继承org.springframework.http.converter.json.MappingJacksonHttpMessageConverter, 如下是我的代码
import java.io.IOException;import org.springframework.http.HttpOutputMessage;import org.springframework.http.converter.HttpMessageNotWritableException;import org.springframework.http.converter.json.MappingJacksonHttpMessageConverter;public class NoCacheMappingJacksonHttpMessageConverter extendsMappingJacksonHttpMessageConverter {@Overrideprotected void writeInternal(Object o, HttpOutputMessage outputMessage)throws IOException, HttpMessageNotWritableException {outputMessage.getHeaders().set("Cache-Control", "no-cache");super.writeInternal(o, outputMessage);}}<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"> <property name="messageConverters"> <list> <bean class="org.springframework.http.converter.StringHttpMessageConverter"> <property name="supportedMediaTypes"> <list> <bean class="org.springframework.http.MediaType"> <constructor-arg value="text"/> <constructor-arg value="plain"/> <constructor-arg value="utf8"/> </bean> </list> </property> </bean> <!-- <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"/> --> <bean class="com.fpi.mespvc.web.util.NoCacheMappingJacksonHttpMessageConverter"/> </list> </property> </bean>