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Editor to share with you how to use SpringBoot interceptor to achieve login interception, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's learn about it!

It can intercept the URL path, and can be used for permission verification, garbled resolution, operation logging, performance monitoring, exception handling, etc.

Implementation code

Create a new interceptor package

Add interceptor code

Package com.qcby.interceptor; import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.method.HandlerMethod;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView; import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession; public class LoginInterceptor implements HandlerInterceptor {@ Autowired private HttpSession httpSession / / before Controller logic execution @ Override public boolean preHandle (HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {System.out.println ("preHandle...."); String uri = request.getRequestURI (); System.out.println ("current path" + uri) The method of marking @ RequestMapping in / * * HandlerMethod= > Controller * adds this logic when static resources are not intercepted, add this logic = > front and back end separate project * / if (! (handler instanceof HandlerMethod)) {return true } if (httpSession.getAttribute ("username") = = null) {/ / jump to the login interface throw new RuntimeException ("no login!") without login;} else {return true }} / / Controller logic has been executed but before the view parser has parsed @ Override public void postHandle (HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {System.out.println ("postHandle....") } / / Controller logic and view parser completed @ Override public void afterCompletion (HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {System.out.println ("afterCompletion....");}}

Register, configure intercept path and exclude login access path

Package com.qcby.config; import com.qcby.interceptor.LoginInterceptor;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.web.servlet.config.annotation.InterceptorRegistry;import org.springframework.web.servlet.config.annotation.WebMvcConfigurer @ Configurationpublic class WebMvcConfig implements WebMvcConfigurer {@ Override public void addInterceptors (InterceptorRegistry registry) {registry.addInterceptor (loginInterceptor ()) .addPathPatt erns ("/ * *") / those paths do not intercept .pathPatterns ("/ user/login", "/ error");} @ Bean public LoginInterceptor loginInterceptor () {return new LoginInterceptor ();}}

Implementation class

@ RestController@RequestMapping ("user") public class UserController {@ Autowired private UserService userService; @ Autowired private HttpSession session; @ ApiOperation ("user login interface") @ RequestMapping (value= "login", method = {RequestMethod.GET,RequestMethod.POST}) public Maplogin (User user) {Map map=new HashMap (); map.put ("code", 0) If (StringUtils.isEmpty (user.getUsername ()) | | StringUtils.isEmpty (user.getPassword () {map.put ("msg", "user or password is empty!") ; return map;} QueryWrapper queryWrapper=new QueryWrapper (); queryWrapper.eq ("username", user.getUsername ()) .eq ("password", user.getPassword ()); User user1=userService.getOne (queryWrapper); if (user1 invalid null) {map.put ("cod", 1); map.put ("data", user1) Session.setAttribute ("username", user1.getUsername ());} else {map.put ("msg", "wrong username or password!");} return map;}}

We cannot go to the blocked page when we are not logged in

Log in

After logging in, we can enter the hello method.

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