Spring MVC but without a view resolver? - spring

Question

is it possible to use Spring 3.1 MVC without using a view resolver?
The reason why i ask is because i simply want to build and create a Web service, not a Website so i do not need to render any JSP or html pages at all. I want to build a RESTful Web service using Spring 3.1.
Is this possible?
this is how my servlett looks like which is taken from a tutorial:
Here is my mvc-config.xml
Here is my Web.xml
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<servlet>
<servlet-name>FreedomSpring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>FreedomSpring</servlet-name>
<url-pattern>*.htm</url-pattern>
</servlet-mapping>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
</param-value>
</context-param>
<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>/WEB-INF/log4j.xml</param-value>
</context-param>
<welcome-file-list>
<welcome-file>
index.jsp
</welcome-file>
</welcome-file-list>
<listener>
<listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>
</web-app>
And here is my controller java class that simply want to return a String from a specific http REST request and not a "ModelAndView" object so to speak
package com.jr.freedom.controllers;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
#Controller
public class Hello {
#RequestMapping(value = "/hello", method = RequestMethod.GET)
public String helloWorldInJson() {
return "hello";
}
}
Also, How can i capture a requests Parameters that a client may send me? is that possible using springs annototations? i know that i can in previous Spring 2.x use HttpServletRequest and HttpServletResponse to get any parameters sent from a client and also return a object back to the user as well such as a JSON object.
i am just looking for a simple example that does this:
Get parameters and possibly HTTP headers from a clients Request on my controller class and map them to some Java object "example, a client sends me details of a new user object registering to my backend service(username, password etc etc) and i want to be able to map this to my Java class Called User"
Return a response of any kind of object such as a String, json or xml data to a client.
Im quite new to Spring 3.0. i did a bit of work on Spring 2.0 long ago but annotations seems the way to go now and do not know how to do it via annotations.
Thanks
Also, To execute the above controller method of helloWorldInJson() do i simply call http://localhost/FreedomSpring/hello ?

Answer 1

You generally use #ResponseBody for this.
See 16.3.3.5 Mapping the response body with the #ResponseBody annotation.
This bypasses the view resolver stuff altogether.

Answer 2

use #RestController instead of #Controller.

Answer 3

This page shows what you want to achieve.
You would use the #PathVariable annotation to inject parameters encoded in the url as method parameter. If the parameters are in the post or the get, then you would use #RequestParam instead.
This doc also explain how to use a view resolver to marshall your model (set by your controller) into any format.

Answer 4

Yes, you can do. I just created spring mvc showcase project. you can find source code here.
https://github.com/mohansaravanan/spring/tree/master/springmvc-3.2.2
You may like this project!