springboot zuul实现网关的代码

网关在微服务里的角色

在微服务架构体系里，网关是非常重要的一个环节，它主要实现了一些功能的统一处理，包括了：

1. 统一授权
2. 统一异常处理
3. 路由导向
4. 跨域处理
5. 限流

实践一下

1 添加依赖

dependencies {
  implementation('org.springframework.cloud:spring-cloud-starter-netflix-eureka-client')
  implementation('org.springframework.cloud:spring-cloud-starter-netflix-zuul')
  testImplementation('org.springframework.boot:spring-boot-starter-test')
  implementation('com.marcosbarbero.cloud:spring-cloud-zuul-ratelimit:1.3.2.RELEASE')
}

2 添加yml

server:
 port: 8300
spring:
 application:
  name: microservice-gateway-zuul
eureka:
 client:
  register-with-eureka: true
  fetch-registry: true
  service-url:
   defaultZone: http://localhost:6761/eureka
 instance:
  ip-address: true
zuul:
 routes:
  users:
    path: /lind/** #以lind开头的路径被重定向到lind服务
    serviceId: lind
 add-host-header: true #显示真实的http头
 retryable: false #关闭Hystrix的重试功能
 ratelimit:
  enabled: true
  # repository: REDIS
  behind-proxy: true
  policies:
    users:
     limit: 5 #限流，每分钟请求5次
     refresh-interval: 60
     type:
      - user
      - origin
      - url
     #    url类型的限流就是通过请求路径区分
     #    origin是通过客户端IP地址区分
     #    user是通过授权用户进行区分，也包括匿名用户

3 添加实现代码

http拦截器，获取用户ID，为子服务进行传递

public class PreRequestLogFilter extends ZuulFilter {
 private static final Logger logger = LoggerFactory.getLogger(PreRequestLogFilter.class);
 private final RateLimiter rateLimiter = RateLimiter.create(1000.0);
 @Override
 public Object run() {
  try {
   RequestContext currentContext = RequestContext.getCurrentContext();
   HttpServletResponse response = currentContext.getResponse();
   HttpServletRequest reqeust = currentContext.getRequest();
   currentContext.addZuulRequestHeader("userId","123");//向子系统http头写数据
   currentContext.addZuulRequestHeader("userName","test");
   PreRequestLogFilter.logger.info(
     String.format("send %s request to %s",
       reqeust.getMethod(),
       reqeust.getRequestURL().toString()));
   if (!rateLimiter.tryAcquire()) {
    HttpStatus httpStatus = HttpStatus.TOO_MANY_REQUESTS;
    response.setContentType(MediaType.TEXT_PLAIN_VALUE);
    response.setStatus(httpStatus.value());
    response.getWriter().append(httpStatus.getReasonPhrase());
    currentContext.setSendZuulResponse(false);
    throw new ZuulException(
      httpStatus.getReasonPhrase(),
      httpStatus.value(),
      httpStatus.getReasonPhrase()
    );
   }
  } catch (java.lang.Exception e) {
   ReflectionUtils.rethrowRuntimeException(e);
  }
  return null;
 }
 @Override
 public boolean shouldFilter() {
  // 判断是否需要过滤
  return true;
 }
 @Override
 public String filterType() {
  return FilterConstants.PRE_TYPE;
 }
 @Override
 public int filterOrder() {
  return Ordered.HIGHEST_PRECEDENCE;
 }
}

在主程中注入这个过滤器

@Bean
 public PreRequestLogFilter preRequestLogFilter() {
  return new PreRequestLogFilter();
 }

4 使用它

在URL上通过localhost:8300/users/home 将进行lind服务里的home控制器下，并在http头上写入了userid和username这个键值对！

总结

以上所述是小编给大家介绍的springboot zuul实现网关，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对我们网站的支持！