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 really don't know what I am doing wrong. I searched and tried some samples I can find in this site but still Im having a problem.

In my controller:

@RequestMapping (method = RequestMethod.POST, headers ={"Accept=application/json"}, value = "/form")
public String postJournalEntry (@RequestParam ("json") String json, Model model) {
    System.out.println(json);
    return "successfullySaved";
}

In my jsp:

$("#btnPostGlEntry").click(function () {
    var glEntries = '{"glEntries":[{"generalLedgerId":"1"},{"accountId":"4"},{"amount":"344.44"},{"description":"Test Entry"},{"debit":"Yes"}]}';
    $.ajax({
        type: "POST",
        contentType: "application/json",
        dataType: "json",
        url: contextPath + "/generalLedger/journalEntries/form",
        data : JSON.stringify(glEntries),
        success: function(data) {
            alert("Success!!!");
        },
        error: function (jqXHR, textStatus, errorThrown) {
            alert(jqXHR + " : " + textStatus + " : " + errorThrown);
        }
    });
});

NOTE : Im not even sure if my function in my controller is correct. I think my controller and my ajax are wrong. Please help.

user2626270 · Accepted Answer · 2013-08-16 23:56:30Z

11

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

answered Aug 16, 2013 at 23:56

user2626270

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TheWhiteRabbit · Accepted Answer · 2013-01-28 06:35:20Z

4

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>

answered Jan 28, 2013 at 6:35

TheWhiteRabbit

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