springboot添加攔截器

鏈接：https://blog.csdn.net/zyp1376308302/article/details/81257510

（侵刪）

實現攔截器的兩個步驟

1. 自定義攔截器實現HandlerInterceptor接口
2. 創建一個配置類繼承WebMvcConfigurerAdapter類並重寫addInterceptors方法

 

代碼

1、自定義攔截器

@Component
public class AdminLoginInterceptor implements HandlerInterceptor {
//    在請求處理之前調用,只有返回true才會執行請求
    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
//        得到session
        HttpSession session = httpServletRequest.getSession(true);
//        得到對象
        Object admin = session.getAttribute("admin");
//        判斷對象是否存在
        if(admin!=null){
            return true;
        }else{
//            不存在則跳轉到登錄頁
            httpServletResponse.sendRedirect(httpServletRequest.getContextPath()+"/login/adminLogin");
            return false;
        }
    }
//    試圖渲染之后執行
    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {

    }
//    在請求處理之后,視圖渲染之前執行
    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {

    }

}

2、自定義配置類繼承WebMvcConfigurerAdapter

@SpringBootConfiguration
public class AdminLoginAdapter extends WebMvcConfigurerAdapter {
    @Autowired
    AdminLoginInterceptor adminLoginInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(adminLoginInterceptor).addPathPatterns("/admin/**").excludePathPatterns("/login/**");
        super.addInterceptors(registry);
    }
}

.addPathPatterns("/admin/**")  ：添加需要過濾的路徑

.excludePathPatterns("/login/**") ：去掉不需要過濾的路徑