package com.zn.filter;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

@Component
public class MyZuulFilter extends ZuulFilter {

    /**
     * 过滤类型
     * @return
     */
    @Override
    public String filterType() {
        return "pre";
    }


    /**
     * 请求过滤顺序
     * @return
     */
    @Override
    public int filterOrder() {
        return 0;
    }

    @Override
    public boolean shouldFilter() {
        return true;
    }

    @Override
    public Object run() throws ZuulException {
        //获取token参数
        RequestContext rc = RequestContext.getCurrentContext();
        HttpServletRequest request = rc.getRequest();

        String token = request.getParameter("token");
        if (token!=null){
            return null;
        }
        //表示不进行路由
        rc.setSendZuulResponse(false);
        rc.setResponseStatusCode(401);
        rc.getResponse().setContentType("text/html;charset=utf-8");
        try {
            rc.getResponse().getWriter().write("没有传递正确参数，请校验后重试！");
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}

package com.zn;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;

@EnableEurekaClient
@SpringBootApplication
@EnableZuulProxy
public class StartSpringCloudZuul {
    public static void main(String[] args) {
        SpringApplication.run(StartSpringCloudZuul.class,args);
    }
}