SpringBoot 自定义拦截器_boot定义cache拦截器

步骤

1. 自定义拦截器类实现 HandlerInterceptor 接口
2. 重写拦截方法 preHandle、postHandle、afterCompletion
3. 在配置类中添加自定义拦截器

自定义拦截器

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Component
public class MyInterceptor implements HandlerInterceptor {

    /**
     * @return 返回 true 放行、放回 false 拦截
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("进入拦截器，前置通知" + request.getRequestURI());
        //过滤掉 确认的 options 请求
        if ("OPTIONS".equals(request.getMethod())) {
            return true;
        }

        String token = request.getHeader("token");

        if (token != null) {
            return true;
        }

        return false;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("后置通知");
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("最终通知");
    }
}
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配置拦截器

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class MyConfig implements WebMvcConfigurer {

    @Autowired
    MyInterceptor myInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        // 添加拦截器
        InterceptorRegistration interceptor = registry.addInterceptor(myInterceptor);
        // 设置放行路径
        interceptor.excludePathPatterns("/hello");
        // 设置拦截的路径
        interceptor.addPathPatterns("/**");

		// 简写形式
        //registry.addInterceptor(myInterceptor)
        //        .excludePathPatterns("/client/hello")
        //        .addPathPatterns("/**");
    }
}
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