springboot拦截器实现_springboot实现拦截器-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_61294560/article/details/127553869

本文介绍了如何在SpringBoot中实现拦截器，包括创建WebMvxConfigurer实现类以添加拦截路径和放行路径，以及创建拦截器类进行条件判断。拦截器主要用于处理如cookie、session等业务逻辑，以及各种条件的定制化操作。

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1，创建一个类，实现WebMvxConfigurer，重写addInterceptors，添加需要拦截的路径，以及放行的路径

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 MyWebMvcConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        try {
            
//MyLoginInterception这个类是拦截的条件（如是否需要登录，需要单独来写，请看下面）
//excludePathPatterns这个是不需要进行拦截的操作路径。
registry.addInterceptor(MyLoginInterception.class.newInstance()).addPathPatterns("/**")
                    .excludePathPatterns("/login", "/register", "/**/*.js", "/**/*.css", "/**/*.html");
        } catch (InstantiationException e) {
            throw new RuntimeException(e);
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        }
    }
}

2，创建类，对拦截路径的请求做条件判断

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

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

@Configuration
public class MyLoginInterception implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("------------start------------");
//这里方便测试，对请求头带有”source“：”back“ 进行放行
        if (null == request.getHeader("source") || !request.getHeader("source").equals("back")) {
            return false;
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("拦截器执行结束");
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("数据返回，执行结束");
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}

拦截器的实现比较简单，比较难的是根据业务，做相关处理，如对cook，session的处理，以及各种条件的处理