@RequestMapping
annotation is used to map the web requests to methods in request-handling
classes.
@Controller
public
class HelloWorldController {
@RequestMapping("welcome")
public ModelAndView getWelcomeMessage()
{
ModelAndView modelAndView =
new ModelAndView("hello");
modelAndView.addObject("message",
"Welcome to spring MVC programming");
return modelAndView;
}
}
For
example, as you see above snippet, I mapped the url /welcome to
getWelcomeMessage.
When
you hit the request url {SERVER_URL}/welcome, getWelcomeMessage() method is
invoked.
Can I add
@RequestMapping on a class?
Yes
you can add @RequestMapping annotation to a class.
@Controller
@RequestMapping("greeting")
public
class HelloWorldController {
@RequestMapping("welcome")
public ModelAndView getWelcomeMessage()
{
ModelAndView modelAndView =
new ModelAndView("hello");
modelAndView.addObject("message",
"Welcome to spring MVC programming");
return modelAndView;
}
}
When
you hit the url {SERVER_URL}/greeting/welcome (class url mapping followed by
method url mapping), getWelcomeMessage() method is called.
Find
the below working application.
package com.sample.myApp.controllers; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.servlet.ModelAndView; @Controller @RequestMapping("greeting") public class HelloWorldController { @RequestMapping("welcome") public ModelAndView getWelcomeMessage() { ModelAndView modelAndView = new ModelAndView("hello"); modelAndView.addObject("message", "Welcome to spring MVC programming"); return modelAndView; } @RequestMapping("hello") public ModelAndView getHelloMessage() { ModelAndView modelAndView = new ModelAndView("hello"); modelAndView.addObject("message", "Hello, How are you"); return modelAndView; } }
Create
hello.jsp file under WEB-INF/jsp folder.
hello.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Hello World Spring Web MVC</title> </head> <body> <h2>${message}</h2> </body> </html>
Create
web.xml, HelloWorld-servlet.xml files under WEB-INF folder.
web.xml
<web-app id="WebApp_ID" 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"> <display-name>Spring MVC Hello WorldApplication</display-name> <servlet> <servlet-name>HelloWorld</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>HelloWorld</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
HelloWorld-servlet.xml
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"> <context:component-scan base-package="com.sample.myApp" /> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/" /> <property name="suffix" value=".jsp" /> </bean> </beans>
Create
index.jsp file under webapp folder.
index.jsp
<html> <body> <h2>Hello World!</h2> </body> </html>
Project
structure looks like below.
Run
the application on server.
When
you hit the url ‘http://localhost:8080/springdemo/greeting/welcome’, you can
able to see below kind of window.
When
you hit the url ‘http://localhost:8080/springdemo/greeting/hello’, you can able
to see below kind of window.
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