springboot Interceptor拦截器设置

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我是靠谱客的博主俊逸西装，这篇文章主要介绍springboot Interceptor拦截器设置，现在分享给大家，希望可以做个参考。

1.通过Javabean定义一个拦截器，需实现HandlerInterceptor接口并重写三个方法（在这只实现拦截前操作）

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public class UserInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        Object user = request.getSession().getAttribute("user");
        if(user == null){
            response.sendRedirect(request.getContextPath()+"/user/nologin");
            return false;
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}

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在preHandle方法中定义拦截器功能，返回true表示放行，false表示拦截（可通过response.sendRedirect(request.getContextPath()+"/user/nologin")方法重定向URL）

2.通过配置文件对拦截器进行配置（取消xml文件形式，使用配置类）

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@Configuration
public class InterceptorConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {

        String[] allow = {"/user/**"};
        String[] noAllow = {"/user/nologin","/user/login"};

        registry.addInterceptor(new         UserInterceptor()).addPathPatterns(allow).excludePathPatterns(noAllow);
        WebMvcConfigurer.super.addInterceptors(registry);
    }
}

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registry.addInterceptor()用于指定拦截器类
addPathPatterns()方法可存放String类型数组，用于指定需要拦截的URL
excludePathPatterns()方法可存放String类型数组，用于指定不需要拦截的URL

3.测试控制器

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@Controller
@RequestMapping(value = "/user")
public class InterceptorController {

    @RequestMapping(value = "/login")
    @ResponseBody
    public String login(HttpServletRequest request){
        User user = new User("zhangsan",55,66,77);
        request.getSession().setAttribute("user",user);
        return "login success";
    }

    @RequestMapping(value = "/nologin")
    @ResponseBody
    public String nologin(){
        return "login false";
    }

    @RequestMapping(value = "/enter")
    @ResponseBody
    public String enter(){
        return "enter success";
    }
}