路由网关（zuul）

pom文件依赖

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zuul</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

应用程序开启路由

import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;

@SpringBootApplication
@EnableEurekaClient
@EnableZuulProxy
public class ZuulApplication

YAML配置路由

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
server:
  port: 8769
spring:
  application:
    name: service-zuul
zuul:
  routes:
    api-a:
      path: /api-a/**
      serviceId: service-ribbon

配置过滤器

import org.springframework.stereotype.Component;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;

@Component
public class MyFilter extends ZuulFilter {
    
    private final static Logger LOG = LoggerFactory.getLogger(MyFilter.class);

    @Override
    public Object run() {  //过滤逻辑
        RequestContext ctx = RequestContext.getCurrentContext();
        HttpServletRequest request = ctx.getRequest();
        LOG.info(String.format("%s >>> %s", request.getMethod(), request.getRequestURL().toString()));
        Object accessToken = request.getParameter("token");
        if(accessToken == null) {
            LOG.warn("token is empty");
            ctx.setSendZuulResponse(false);
            ctx.setResponseStatusCode(401);
            try {
                ctx.getResponse().getWriter().write("token is empty");
            } catch (IOException e) {
                LOG.error(e.getMessage());
            }
            return null;
        }
        LOG.info("ok");
        return null;
    }

    @Override
    public boolean shouldFilter() {
        return true;  //是否启用过滤
    }

    @Override
    public int filterOrder() {
        return 0;  //过滤的顺序
    }

    @Override
    public String filterType() {
        return "pre";  //返回一个字符串代表过滤器类型：pre routing post error
    }
}