Zuul请求过滤配置

问题描述

有时候系统的功能并不对外开放，所以在请求服务时可以过滤掉非法请求。Zuul通过ZuulFilter过滤器实现，每次经过Zuul服务网关，我们都对带来的token进行有效性验证，验证不通过就无法请求成功

配置过程

定义过滤类

命名为：AccessFilter.java，继承ZuulFilter

package com.ledao.filter;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.http.HttpServletRequest;

/**
 * @author LeDao
 * @company
 * @create 2021-08-18 0:57
 */
public class AccessFilter extends ZuulFilter {

    Logger logger = LoggerFactory.getLogger(AccessFilter.class);

    /**
     * 过滤器的类型 这里用pre，代表会再请求被路由之前执行
     *
     * @return
     */
    @Override
    public String filterType() {
        return "pre";
    }

    /**
     * 过滤器的执行顺序
     *
     * @return
     */
    @Override
    public int filterOrder() {
        return 0;
    }

    /**
     * 判断该过滤器是否要被执行,返回true则执行过滤器
     *
     * @return
     */
    @Override
    public boolean shouldFilter() {
        return true;
    }

    /**
     * 过滤器的具体执行逻辑
     *
     * @return
     * @throws ZuulException
     */
    @Override
    public Object run() throws ZuulException {
        RequestContext requestContext = RequestContext.getCurrentContext();
        HttpServletRequest request = requestContext.getRequest();
        String parameter = request.getParameter("accessToken");
        logger.info(request.getRequestURI() + "请求访问");
        if (parameter == null) {
            logger.error("accessToken为空!");
            requestContext.setSendZuulResponse(false);
            requestContext.setResponseStatusCode(401);
            requestContext.setResponseBody("{\"result\":\"accessToken is empty!\"}");
            return null;
        }
        logger.info(request.getRequestURI() + "请求成功");
        return null;
    }
}

开启Filter配置

新建一个类，命名为：ZuulConfig.java

package com.ledao.config;

import com.ledao.filter.AccessFilter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * Zuul配置
 *
 * @author LeDao
 * @company
 * @create 2021-08-18 0:59
 */
@Configuration
public class ZuulConfig {

    @Bean
    public AccessFilter accessFilter() {
        return new AccessFilter();
    }
}