JSON - Spring MVC : How to post json data to spring MVC controller

Question

I have a problem posting JSON data from jsp to controller. Everytime I try I get an ajax error Bad Request. Im so new to JSON and I re

Answer 1

If you want your JSON to be deserialized into some class, than you have to define method like this (and don't forget to add jsonConverter, as in previous answer):

.... method(@RequestBody MyClass data){ ... }

But, if you want your method to accept JSON as String than do this:

.... method(@RequestBody String json){ ... }

So, basically, if you post JSON, it means that JSON is not a parameter, it is body of the request. And eventually you have to use @RequestBody annotation, instead of @RequestParam.

You can find beautifull video tutorial of Spring Mvc and JSON here: sites.google.com/site/upida4j/example

Answer 2

it seems you dont have a Json Converter configured properly

like this one

<bean id="jacksonMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"></bean>
 <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
  <list>
    <ref bean="jacksonMessageConverter"/>
  </list>
</property>
</bean>