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