Spring MVC @Controller Annotation Example
April 19, 2015
Create A Class using @Controller
To test the @Controller, we are creating a class which will be annotated with @Controller. We are creating a method that will serve the request for a specific URL pattern annotated by @RequestMapping.HelloWorldController.java
package com.concretepage.controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
@Controller
@RequestMapping("/testapp")
public class HelloWorldController {
@RequestMapping(value="hello")
public String createUser(@RequestParam("name") String name, ModelMap model) {
model.addAttribute("name", name);
return "success";
}
}
Configure Controller package in Java Config or Spring XML
In our demo we are using java config to configure bean. @Controller annotation is scanned by spring. So our class annotated with @Controller is available in spring container. Find the java configuration file.AppConfig.java
package com.concretepage.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.view.JstlView;
import org.springframework.web.servlet.view.UrlBasedViewResolver;
@Configuration
@ComponentScan("com.concretepage.controller")
public class AppConfig {
@Bean
public UrlBasedViewResolver setupViewResolver() {
UrlBasedViewResolver resolver = new UrlBasedViewResolver();
resolver.setPrefix("/WEB-INF/views/");
resolver.setSuffix(".jsp");
resolver.setViewClass(JstlView.class);
return resolver;
}
}
<context:component-scan base-package="com.concretepage.controller" />
Create a View Page
When the method in controller runs, our view page is displayed. Find the JSP.success.jsp
<html>
<head>
<title> @Controller Demo </title>
</head>
<body>
<h1>Hello : ${name}</h1>
</body>
</html>
Output
To check the output, run the URL http://localhost:8080/concretepage-1/testapp/hello?name=RamWe will get the output.
