Zuul网关

Zuul网关

添加pom依赖

<!-- Eureka -->
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-eureka</artifactId>
</dependency>
<!-- zuul -->
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-zuul</artifactId>
</dependency>
<!-- zuul网关的重试机制，不是使用ribbon内置的重试机制是借助spring-retry组件实现的重试开启zuul网关重试机制需要增加下述依赖-->
<dependency>
   <groupId>org.springframework.retry</groupId>
   <artifactId>spring-retry</artifactId>
</dependency>

配置yml文件

server: 
  port: 9527
 
spring: 
  application:
    name: microservicecloud-zuul-gateway
 
eureka: 
  client: 
    service-url: 
      defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka,http://eureka7003.com:7003/eureka  
  instance:
    instance-id: gateway-9527.com
    prefer-ip-address: true 
 
 
zuul: 
  #ignored-services: microservicecloud-dept
  prefix: /atguigu
  ignored-services: "*"
  routes: 
    mydept.serviceId: microservicecloud-dept
    mydept.path: /mydept/**
 
info:
  app.name: atguigu-microcloud
  company.name: www.atguigu.com
  build.artifactId: $project.artifactId$
  build.version: $project.version$

主启动类

@SpringBootApplication
@EnableZuulProxy
public class Zuul_9527_StartSpringCloudApp
{
	public static void main(String[] args)
	{
		SpringApplication.run(Zuul_9527_StartSpringCloudApp.class, args);
	}
}

网关上做权限校验

四种标准的Filter类型及其在请求生命周期中所处的位置：

• PRE Filter：在请求路由到目标之前执行。一般用于请求认证、负载均衡和日志记录。
• ROUTING Filter：处理目标请求。这里使用Apache HttpClient或Netflix Ribbon构造对目标的HTTP请求。
• POST Filter：在目标请求返回后执行。一般会在此步骤添加响应头、收集统计和性能数据等。
• ERROR Filter：整个流程某块出错时执行。

@Component
public class LoginFilter extends ZuulFilter {

    public static final String PRE_TYPE = "pre";

    // 前置过滤器
    @Override
    public String filterType() {
        return PRE_TYPE;
    }

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

    @Override
    public boolean shouldFilter() {

        RequestContext requestContext = RequestContext.getCurrentContext();
        HttpServletRequest request = requestContext.getRequest();

        System.out.println("address:" + request.getRemoteAddr());
        System.out.println("uri:" + request.getRequestURI());
        System.out.println("url:" + request.getRequestURL());
        // 这里可以结合ACL进行本地化或者放入到redis
        if ("/apigateway/order/api/v1/order/saveforribbon".equalsIgnoreCase(request.getRequestURI())) {
            return true;
        }
        return false;
    }

    @Override
    public Object run() throws ZuulException {
        RequestContext requestContext = RequestContext.getCurrentContext();
        HttpServletRequest request = requestContext.getRequest();
        String token = request.getHeader("token");
        if (StringUtils.isBlank(token)) {
            token = request.getParameter("token");
        }
        if (StringUtils.isBlank(token)) {
            requestContext.setSendZuulResponse(false);
            requestContext.setResponseStatusCode(HttpStatus.UNAUTHORIZED.value());
        }
        return null;
    }
}

网关限流

@Component
public class OrderRateLimiteFilter extends ZuulFilter {

    public static final String PRE_TYPE = "pre";
    //每秒钟产生1000个令牌
    private static final RateLimiter rateLimiter = RateLimiter.create(1000);

    @Override
    public String filterType() {
        return PRE_TYPE;
    }

    @Override
    public int filterOrder() {
        return 0;
    }

    @Override
    public boolean shouldFilter() {

        RequestContext requestContext = RequestContext.getCurrentContext();
        HttpServletRequest request = requestContext.getRequest();
        if ("/apigateway/order/api/v1/order/saveforribbon".equalsIgnoreCase(request.getRequestURI())) {
            return true;
        }
        return false;
    }

    @Override
    public Object run() throws ZuulException {
        RequestContext requestContext = RequestContext.getCurrentContext();
        if (!rateLimiter.tryAcquire()) {
            requestContext.setSendZuulResponse(false);
            requestContext.setResponseStatusCode(HttpStatus.TOO_MANY_REQUESTS.value());
        }
        return null;
    }
}