This is a very basic example of using Spring MVC with JavaConfig to make a helloworld web apps.
The first part of this is to create a configuration class for the web app. below is a sample of the configuration class we are going to use:
Configuration
@EnableWebMvc
@ComponentScan(basePackages = {"com.johnathanmsmith.mvc.web"})
public class WebMVCConfig extends WebMvcConfigurerAdapter
{
private static final Logger logger = LoggerFactory.getLogger(WebMVCConfig.class);
@Bean
public ViewResolver resolver()
{
UrlBasedViewResolver url = new UrlBasedViewResolver();
url.setPrefix("/views/");
url.setViewClass(JstlView.class);
url.setSuffix(".jsp");
return url;
}
@Override
public void addResourceHandlers(ResourceHandlerRegistry registry)
{
logger.debug("setting up resource handlers");
registry.addResourceHandler("/resources/").addResourceLocations("/resources/**");
}
@Override
public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer)
{
logger.debug("configureDefaultServletHandling");
configurer.enable();
}
@Bean
public SimpleMappingExceptionResolver simpleMappingExceptionResolver()
{
SimpleMappingExceptionResolver b = new SimpleMappingExceptionResolver();
Properties mappings = new Properties();
mappings.put("org.springframework.web.servlet.PageNotFound", "p404");
mappings.put("org.springframework.dao.DataAccessException", "dataAccessFailure");
mappings.put("org.springframework.transaction.TransactionException", "dataAccessFailure");
b.setExceptionMappings(mappings);
return b;
}
}
Next you have to setup the web.xml file to use the above configuration class, we do this but setting the contectConfigLocation to the package of the configuration class. see below:
<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>Spring MVC Dispatcher Servlet</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.johnathanmsmith.mvc.web.config, com.johnathanmsmith.mvc.web.controller</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Spring MVC Dispatcher Servlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
Now lets setup a basic controller to display a page:
@Controller
@RequestMapping("/ask")
class IndexController
{
private static final Logger logger = LoggerFactory.getLogger(IndexController.class);
@RequestMapping(method = RequestMethod.GET)
public String displayRequestPage()
{
/*
I am going to display the helloworld.jsp page now :)
*/
logger.debug("made it to controller");
return "helloworld";
}
}
Thats all it takes..
To get this project and run it you will need to follow the following steps:
git clone [email protected]:JohnathanMarkSmith/springmvc-helloworld.git
cd springmvc-helloworld/
mvn tomcat7:run
Now open your web brower and goto http://127.0.0.1:8080/springmvc-helloworld/
This its... Have run with it...
If you have any questions or comments please email me at [email protected] or checkout my web site http://JohnathanMarkSmith.com
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