[Java Spring MVC] Introduction to interceptors
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Interceptor jump in before controller. So request may not reach controller if Pre-process is not ok.
Demo:
package com.test.hplus.interceptors; import org.springframework.web.servlet.ModelAndView; import org.springframework.web.servlet.handler.HandlerInterceptorAdapter; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.util.Date; public class LoggingInterceptor extends HandlerInterceptorAdapter { @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { //get all cookies //log session id: //log the request path String sessionId = null; if(null!=request.getCookies()){ for(Cookie cookie: request.getCookies()){ if("JSESSIONID".equals(cookie.getName())){ sessionId = cookie.getValue(); } } } System.out.println("Incoming request data log: session: "+sessionId+ " at "+ new Date()+" for "+request.getRequestURI()); return true; } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { System.out.println("in post handle"); } }
Add inteceptor to conifg:
@Configuration @ComponentScan(basePackages = "com.test.hplus") public class ApplicationConfig extends WebMvcConfigurationSupport { ... @Override protected void addInterceptors(InterceptorRegistry registry) { registry.addInterceptor(new LoggingInterceptor()).addPathPatterns("/*"); } }
For each requests, login interceptor will jump in.
Forwarding request from login controller to profile controller:
@PostMapping("/login") public String login(@ModelAttribute("login")Login login){ User user = userRepository.searchByName(login.getUsername()); if(user==null){ throw new ApplicationException("User not found"); } return "forward:/userprofile"; }
@Controller public class UserProfileController { @PostMapping("/userprofile") public String getUserProfile(@SessionAttribute("login")Login login, Model model){ System.out.println("in user profile controller"); System.out.println("username from session: "+login.getUsername()); //call to userrepository to get all the user information model.addAttribute("username", login.getUsername()); return "profile"; } }
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