In the last tutorial we understood the purpose of ViewControllerRegistry. In this example, we are going to use ViewControllerRegistry to map URL to view name along with a response status code. We will also see how to register a status code that will be returned with empty response body.
Mapping URL to view and setting status code
As we are going to use Spring boot, here's the main configuration class which is going to configure url to view mapping. We are also setting a status code:
@SpringBootApplication
public class Main extends WebMvcConfigurerAdapter {
@Override
public void addViewControllers (ViewControllerRegistry registry) {
ViewControllerRegistration r = registry.addViewController("/test");
r.setViewName("myView");
r.setStatusCode(HttpStatus.GONE);
}
public static void main (String[] args) {
SpringApplication.run(Main.class, args);
}
}
src/main/webapp/WEB-INF/pages/myView.jsp<html>
<body style="margin:20px;">
JSP view
<p>
</p>
<p>
Response Status: <%=response.getStatus() %>
</p>
</body>
</html>
Boot's properties
src/main/resources/application.propertiesspring.mvc.view.prefix= /WEB-INF/pages/
spring.mvc.view.suffix= .jsp
In this example we are not creating a controller as we don't need one to demonstrate direct mapping of URL to view.
Running application:
mvn spring-boot:run
Output
Returning status code without a message body
In this case, we just have to specify a status code for a URL and no view name is needed. Spring will return the response with empty body.
@SpringBootApplication
public class Main extends WebMvcConfigurerAdapter {
@Override
public void addViewControllers (ViewControllerRegistry registry) {
registry.addStatusController("/test2", HttpStatus.SERVICE_UNAVAILABLE);
}
public static void main (String[] args) {
SpringApplication.run(Main.class, args);
}
}
Note that ViewControllerRegistry#addStatusController method return type is void, so it's simple one line of configuration.
Output
Using HTTPie
In the next tutorial, we are going to understand how to redirect a URL to another URL by using ViewControllerRegistry.
Example ProjectDependencies and Technologies Used: - Spring Boot 1.4.4.RELEASE
Corresponding Spring Version 4.3.6.RELEASE - spring-boot-starter-web : Starter for building web, including RESTful, applications using Spring
MVC. Uses Tomcat as the default embedded container.
- tomcat-embed-jasper 8.5.11: Core Tomcat implementation.
- JDK 1.8
- Maven 3.3.9
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