SpringBoot项目中配置拦截器

1.写一个Interceptor继承HandlerInterceptorAdapter

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

@Component
public class LoginInterceptor extends HandlerInterceptorAdapter {

    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    	//这里写你要拦截的参数,通过request获取前端传过来的数据
        return true;
    }

    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable ModelAndView modelAndView) throws Exception {
    }

    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable Exception ex) throws Exception {
    }

    public void afterConcurrentHandlingStarted(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    }
}

           

这里也可以实现HandlerInterceptor接口，重写它的三个方法，不过使用HandlerInterceptorAdapter比较灵活，因为它是抽象类，我们可是任意实现三个方法

2.实现拦截器后还要将拦截器添加到配置类中，这样才能使用拦截器

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

@Configuration
public class GmallWebMvcConfig implements WebMvcConfigurer {

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
    	//这里可以配置拦截所有方法
        registry.addInterceptor(loginInterceptor).addPathPatterns("/**");
        
    }
}
           

这里也可以继承WebMvcConfigurationSupport，重写相同的方法