Zuul的反向代理、过滤及动态网关配置实例

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1.反向代理功能

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
</dependency>

### 配置网关反向代理    
zuul:
  routes:
    api-a:
     ### 以 /api-member/访问转发到会员服务
      path: /api-member/**
      serviceId: app-jarye-member
    api-b:
        ### 以 /api-order/访问转发到订单服务
      path: /api-order/**
      serviceId: app-jarye-order

2.网关的过滤功能

@Component
public class TokenFilter extends ZuulFilter {

    public Object run() throws ZuulException {
        // 获取上下文
        RequestContext currentContext = RequestContext.getCurrentContext();
        HttpServletRequest request = currentContext.getRequest();
        String userToken = request.getParameter("userToken");
        if (StringUtils.isEmpty(userToken)) {
            currentContext.setSendZuulResponse(false);
            currentContext.setResponseStatusCode(401);
            currentContext.setResponseBody("userToken is null");
            return null;
        }
        // 否则正常执行业务逻辑.....
        return null;
    }

    // 判断过滤器是否生效
    public boolean shouldFilter() {

        return true;
    }

    // 过滤器的执行顺序。当请求在一个阶段的时候存在多个多个过滤器时，需要根据该方法的返回值依次执行
    public int filterOrder() {

        return 0;
    }

    // 过滤器类型 pre 表示在 请求之前进行拦截
    public String filterType() {

        return "pre";
    }

}

3.动态网关配置

Git动态配置
### 配置网关反向代理    
zuul:
  routes:
    api-a:
     ### 以 /api-member/访问转发到会员服务
      path: /api-member/**
      serviceId: app-jarye-member
    api-b:
        ### 以 /api-order/访问转发到订单服务
      path: /api-order/**
serviceId: app-jarye-order


<!-- actuator监控中心 -->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>
    <!-- springcloud config 2.0 -->
    <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-config-client</artifactId>
    </dependency>

###网关名称  
spring:
  application:
    name: service-zuul
  cloud:
    config:
    ####读取后缀
      profile: dev
      ####读取config-server注册地址
      discovery:
        service-id: config-server
        enabled: true    

###默认服务读取eureka注册服务列表 默认间隔30秒

###开启所有监控中心接口
management:
  endpoints:
    web:
      exposure:
        include: "*"

// zuul配置能够使用config实现实时更新
  @RefreshScope
  @ConfigurationProperties("zuul")
  public ZuulProperties zuulProperties() {
    return new ZuulProperties();
  }