java过滤器和拦截器的区别_spring拦截器和过滤器

全栈程序员-站长 • 2022年8月9日上午7:16 • 未分类 • 阅读 7

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集成拦截器

登录验证为例

添加拦截器

public class LoginInterceptor implements HandlerInterceptor { 
     

    private Logger log = LoggerFactory.getLogger(getClass());

    //Controller逻辑执行之前
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { 
     
        log.info("preHandle....");
        Object user = WebUtils.getHttpSession().getAttribute("user");
        log.info("user:{}",user);
        String uri = request.getRequestURI();
        log.info("uri："+ uri);
        if (user == null) { 
     
            response.sendRedirect("/");
            return false;
        } else { 
     
            return true;
        }
    }

    //Controller逻辑执行完毕但是视图解析器还未进行解析之前
    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception { 
     
        log.info("postHandle....");
    }

    //Controller逻辑和视图解析器执行完毕
    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception { 
     
        log.info("afterCompletion....");
    }
}

@Configuration
public class WebMvcConfig implements WebMvcConfigurer { 
     

    @Override
    public void addInterceptors(InterceptorRegistry registry) { 
     
        registry.addInterceptor(new LoginInterceptor()).addPathPatterns("/**")
                .excludePathPatterns("/", "/login",  "/user/login","/user/login",
                        "/images/**", "/user/getCode", "/js/**", "/page/**",  "/layui/**",
                        "/layui_ext/**", "/login.html", "/webjars/**", "/css/**");
    }
}

退出登录清除session

    /** * 跳转到登录 * @return */
    @RequestMapping("toLogin")
    public String toLogin(){ 
     
        WebUtils.getHttpSession().removeAttribute("user");
        return "/";
    }