What are the prerequisites of returning complex data types like List from a Spring controller class via Ajax?

Question

4.00/5 (1 vote)

See more:

I'm working with Spring MVC 3.0.2 with Hibernate using JSP. I'm using RESTful (annotated) controllers in Spring. Many a times, I need to return a java.util.List using Ajax (to and) from the Spring controller class which is mapped with appropriate (mostly GET and POST) requests. Something like the one shown below.

Java

@RequestMapping(method=RequestMethod.POST, value="ajax/TempAjax")
    
public @ResponseBody List<Country>getStateList(@ModelAttribute("someBean") 
SomeBean someBean, BindingResult error, HttpServletRequest request, 
HttpServletResponse response)
{
    Session session=NewHibernateUtil.getSessionFactory().getCurrentSession();
    session.beginTransaction();

    List<Country>list=session.createQuery("from State where countryId = 
   "+request.getParameter("countryId")+" order by stateId").list();

    session.flush();
    session.getTransaction().commit();
    return list;
}

What I'm trying to do is when a country is selected from a Country select box, corresponding states of that country should be populated from the database in the State select box according to the countryId passed to the Spring controller class via Ajax.

I'm not sure but the Spring MVC 3.0.2 should support some direct mechanism like JSON. Could you please let me know what are the prerequisites of using Ajax to accomplish such task in Spring MVC. If possible, could you please give me some example. I have searched on Google but I didn't realize the basic requirements as I'm using such stuff very first time.

Posted 6-Aug-12 1:37am

Lion 2012

Updated 6-Aug-12 1:56am

v2

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

leejoyprakash · Answer 1 · 2012-09-21T03:53:00

Add this in spring config xml 

<beans:bean class="org.springframework.web.servlet.view.json.MappingJacksonJsonView" >
	<beans:property name="extractValueFromSingleKeyModel" value="true" />
</beans:bean>

Add jackson-core-asl-1.1.2.jar and jackson-mapper-asl-1.1.2.jar to build path

In Controller:

/**
 * Receives ajax request from the client gets the response from the web
 * service usng service classes and sends the response back to the client on
 * JSON format.
 */
 @RequestMapping(value = "/showSomeData", method = RequestMethod.POST)
 public @ResponseBody SampleClass someFunction() {

      // Do the processing 
	SampleClass sampleClass = new SampleClass();
      // set the properties for sampleClass

      return sampleClass;

 }

This blog might help you to understand things more.