Spring MVC RequestMappingHandlerMapping Interceptor Annotation Example
April 02, 2015
Required Software
Find the required software and tools.1. Java 7
2. Tomcat 8
3. Eclipse
4. Gradle
5. Spring 4
Project Structure in Eclipse
Find the project structure in eclipse.
Configuration File for RequestMappingHandlerMapping
RequestMappingHandlerMapping automatically searches for @RequestMapping annotations in all controller classes annotated with @Controller. In java configuration class, we need to implement WebMvcConfigurationSupport.requestMappingHandlerMapping(). If we annotate our class with @EnableWebMvc annotation, we need not to extend WebMvcConfigurationSupport. To add interceptor, it provides a method setInterceptors() . We can add more than one interceptor. We cannot assign path patterns here. They work for all patterns. We can set order of interceptors using setOrder() method.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.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;
import org.springframework.web.servlet.view.JstlView;
import org.springframework.web.servlet.view.UrlBasedViewResolver;
import com.concretepage.interceptors.LoggingInterceptor;
@Configuration
@ComponentScan("com.concretepage")
@EnableWebMvc
public class AppConfig {
@Bean
public UrlBasedViewResolver setupViewResolver() {
UrlBasedViewResolver resolver = new UrlBasedViewResolver();
resolver.setPrefix("/views/");
resolver.setSuffix(".jsp");
resolver.setViewClass(JstlView.class);
return resolver;
}
@Bean
public RequestMappingHandlerMapping requestMappingHandlerMapping() {
RequestMappingHandlerMapping mapping = new RequestMappingHandlerMapping();
mapping.setInterceptors(new Object[] {getLoggingHandler()});
return mapping;
}
@Bean
public LoggingInterceptor getLoggingHandler(){
return new LoggingInterceptor();
}
}
Create Interceptor Class
We are creating one interceptor class using HandlerInterceptorAdapter.LoggingInterceptor.java
package com.concretepage.interceptors;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
public class LoggingInterceptor extends HandlerInterceptorAdapter {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
System.out.println("---Before Method Execution---preHandle()");
return true;
}
}
Create Controller
Find the controller class.WelcomeController.java
package com.concretepage;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
@RequestMapping("/myworld")
public class WelcomeController {
@RequestMapping("/welcome")
public String hello(Model model) {
System.out.println("Welcome Friends!");
model.addAttribute("msg", "Welcome Friends!");
return "result";
}
}
Output
Run the URLhttp://localhost:8080/concretepage-1/myworld/welcome
And find the output in console.
---Before Method Execution---preHandle() Welcome Friends!
