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SpringBoot開(kāi)發(fā)之?dāng)r截器實(shí)例

更新時(shí)間：2023年09月01日 10:16:22 作者：韓_師兄

這篇文章主要介紹了SpringBoot開(kāi)發(fā)之?dāng)r截器實(shí)例,Spring?Boot簡(jiǎn)介Spring?Boot發(fā)展史SpringBoot的魅力SpringBoot的優(yōu)點(diǎn)總結(jié)Spring?Boot是一個(gè)基于Spring框架的快速開(kāi)發(fā)腳手架,它簡(jiǎn)化了Spring應(yīng)用的初始化和搭建過(guò)程,需要的朋友可以參考下

1 攔截器

列如常見(jiàn)的登錄攔截校驗(yàn):

1 HandlerInterceptor 接口

/**
 * 登錄檢查
 * 1、配置好攔截器要攔截哪些請(qǐng)求
 * 2、把這些配置放在容器中
 */
@Slf4j
public class LoginInterceptor implements HandlerInterceptor {
    /**
     * 目標(biāo)方法執(zhí)行之前
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String requestURI = request.getRequestURI();
        log.info("preHandle攔截的請(qǐng)求路徑是{}",requestURI);
        // 登錄檢查邏輯
        HttpSession session = request.getSession();
        Object loginUser = session.getAttribute("loginUser");
        if(loginUser != null){
            // 放行
            return true;
        }
        // 攔截住。未登錄。跳轉(zhuǎn)到登錄頁(yè)
        request.setAttribute("msg","請(qǐng)先登錄");
//        re.sendRedirect("/");
        request.getRequestDispatcher("/").forward(request,response);
        return false;
    }
    /**
     * 目標(biāo)方法執(zhí)行完成以后
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        log.info("postHandle執(zhí)行{}",modelAndView);
    }
    /**
     * 頁(yè)面渲染以后
     * @param request
     * @param response
     * @param handler
     * @param ex
     * @throws Exception
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        log.info("afterCompletion執(zhí)行異常{}",ex);
    }
}

2 配置攔截器

/**
 * 1、編寫一個(gè)攔截器實(shí)現(xiàn)HandlerInterceptor接口
 * 2、攔截器注冊(cè)到容器中（實(shí)現(xiàn)WebMvcConfigurer的addInterceptors）
 * 3、指定攔截規(guī)則【如果是攔截所有，靜態(tài)資源也會(huì)被攔截】
 */
@Configuration
public class AdminWebConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new LoginInterceptor())
                .addPathPatterns("/**")  // 所有請(qǐng)求都被攔截包括靜態(tài)資源
                .excludePathPatterns("/","/login","/css/**","/fonts/**","/images/**","/js/**"); // 放行的請(qǐng)求
    }
}