How to make spring controller Get request on controller

Let's begin dilsecodie  

Spring Web model-view-controller (MVC) framework

Get code example from - dilsecodie

Step 1: GOTO spring MVC section, find spring controller 

Step 2:  use code in your class, which you want to make the class a controller.

Step 3: In @RequestMapping value means request URL endpoint, changes its values as per your requirement.

Step4: before step 3 check, the class uses @controller and spring dependency.

Step5: @ModelAttribute is used for getting request parameters from URL.

Step6: Make service in the controller according to business logic, then return model view.

Step7: Modelview means  view you need to show model output in HTML page (or JSP page)

Step8: Controller can also call another controller can see in example return showData(); 

, as showData(); method calls another controller then model view return.

let's understand the working of the spring controller,

First request come to dispatcher servlet in web.xml file 

<servlet>

<servlet-name>dispatcher</servlet-name>

<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

<load-on-startup>1</load-on-startup>

</servlet>

<servlet-mapping>

<servlet-name>dispatcher</servlet-name>

<url-pattern>*.htm</url-pattern>

</servlet-mapping>

then spring created the objects which are mentioned in xml file 

<context:component-scan base-package= Mention your folder which containes 

all the files .

<context:exclude-filter expression="org.springframework.stereotype.Controller"

type="annotation" />

</context:component-scan> 

use this tag will scan your controller which provide correct controller 

for request end point 

These property need to define in applicationContext.xml file 

<mvc:annotation-driven />  also its tag is one of important tag bcoz 

its autowired your all beans 

<property name="packagesToScan" value="com.your.packages"></property> 

its also used for all files scan so spring container can provide you object of bean

So when spring provide request a correct controller Then 

Controller class should have @Controller define in it .

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.ExceptionHandler;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestParam;

import org.springframework.web.bind.annotation.ResponseBody;

these packages of spring should be import in your class .

For get request handle using GET method 

@RequestMapping(value={"getDilsecodieUserData"}, 

method={org.springframework.web.bind.annotation.RequestMethod.GET})

public ModelAndView getDilsecodieGetData

(HttpServletRequest request,HttpSession session){

ModelAndView mv = new ModelAndView("dilsecodie/index");

Write your service to implement business logic , and add model object 

return mv;

 }

For post request handler using post method 

@RequestMapping(value={"askquestionsdilsecodie"}, method={org.springframework.web.bind.annotation.RequestMethod.POST})

ModelAndView askquestionDilsecodie(HttpServletRequest req, HttpSession session) 

throws CustomException{

String value1= req.getParameter("value1");

String value2= req.getParameter("value2");

String value3= req.getParameter("value3");

ModelAndView mv1 = new ModelAndView("dilsecodie/dashboard");

Write your service to implement business logic , and add model object 

return mv1;

 }

 @RequestMapping("sendStringvalue")

@ResponseBody

String saveShortlisting(HttpServletRequest req, HttpServletResponse res){

msg = "success";

return msg;

}

@RequestMapping("sendStringvalue")

@ResponseBody

String saveStories(HttpServletRequest req, HttpServletResponse res){

msg = "success";

return msg;

}

If needed to handle any type of request both post or get request then use 

@RequestMapping("updateInterviewStatus")

ModelAndView updateStatus(HttpServletRequest req, HttpServletResponse res){

ModelAndView mv3 = new ModelAndView("dilsecodie/das");

Write your service to implement business logic , and add model object 

return mv3;

}