springBoot 登錄攔截器

1、首選創建一個繼承HandlerInterceptor的攔截器

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
/*** 攔截器*/
public class MyInterceptor implements HandlerInterceptor{//在請求處理之前進行調用（Controller方法調用之前@Overridepublic boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {HttpSession session = httpServletRequest.getSession();String user = (String) session.getAttribute("user"); //獲取登錄的session信息if(user!=null){return true;}else{
httpServletResponse.sendRedirect(httpServletRequest.getContextPath()+"/login/index");  //未登錄自動跳轉界面return false;}}//請求處理之后進行調用，但是在視圖被渲染之前（Controller方法調用之后）@Overridepublic void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {System.out.println("postHandle被調用\n");}//在整個請求結束之后被調用，也就是在DispatcherServlet 渲染了對應的視圖之后執行（主要是用于進行資源清理工作）@Overridepublic void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {System.out.println("afterCompletion被調用\n");}
}

　　2、繼承WebMvcConfigureAdapter類，覆蓋其addInterceptors接口,注冊自定義的攔截器：

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;@Configuration
public class WebMvcConfig implements WebMvcConfigurer {/*** 注冊攔截器*/@Overridepublic void addInterceptors(InterceptorRegistry registry) {//addPathPattern后跟攔截地址，excludePathPatterns后跟排除攔截地址registry.addInterceptor(new MyInterceptor()).addPathPatterns("/**").excludePathPatterns("/login/index").excludePathPatterns("/login/login"); } 
}

　　

這樣我們就可以在用戶請求到達controller層實現登錄攔截了，所有用戶請求都會被攔截，在prehandle方法進行登錄判斷，返回true則驗證通過，否則失敗