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
    @Override
    public 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）
    @Override
    public 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（主要是用於進行資源清理工作）
    @Override
    public 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
     */
    @Override
    public 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