In this tutorial we will create simple web application with java-based (annotations) configuration, without any spring xml files.
Technologies used:
1. Spring 3.2.9.RELEASE
2. Maven 3
The maven dependencies are as follows:
<dependencies> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>3.2.9.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>3.2.9.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>3.2.9.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>3.2.9.RELEASE</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.1.0</version> </dependency> </dependencies>
For the simple project, all java-based configuration is defined in one class:
package com.devcases.springMVC.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
@Configuration
@ComponentScan(basePackages = {"com.devcases.springMVC.controller"})
@EnableWebMvc
public class WebAppConfig extends WebMvcConfigurerAdapter {
@Bean
public InternalResourceViewResolver getInternalResourceViewResolver() {
InternalResourceViewResolver resolver = new InternalResourceViewResolver();
resolver.setPrefix("/WEB-INF/views/");
resolver.setSuffix(".jsp");
return resolver;
}
}
The @Configuration annotation tells spring, that this class can be used as a source of bean definitions. The @Bean annotation tells, that the methos return the object, that should be registered as bean in application context, in our example we are returning InternalResourceViewResolver.
@EnableWebMVC is equivalent to <mvc:annotation-driven/> element in XML configuration – it enables support for @Controller, @RequestMapping and others.
@ComponentScan is the same as <context:component-scan/> element in XML.
In web.xml we have to declare dispatcherServlet and tell it, where the configuration is located:
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5"> <servlet> <servlet-name>sample</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextClass</param-name> <param-value> org.springframework.web.context.support.AnnotationConfigWebApplicationContext </param-value> </init-param> <init-param> <param-name>contextConfigLocation</param-name> <param-value> com.devcases.springMVC.config </param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>sample</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
To test our configuration, we will create one controller:
>package com.devcases.springMVC.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
@Controller
public class AppController {
@RequestMapping(value="/index")
public ModelAndView goToHelloPage() {
ModelAndView view = new ModelAndView();
view.setViewName("index");
return view;
}
}
And the page, which controller will be serving:
<html> <head> <title>Home</title> </head> <body> <h1>Hello Spring MVC!</h1> </body> </html>
The source code can be downloaded from here.