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：
- 统一授权
- 统一异常处理
- 路由导向
- 跨域处理
- 限流
实践一下
1 添加依赖
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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
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server: port: 8300spring: application: name: microservice-gateway-zuuleureka: client: register-with-eureka: true fetch-registry: true service-url: defaultzone: http://localhost:6761/eureka instance: ip-address: truezuul: 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
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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
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@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服务器之家网站的支持！
原文链接：http://www.cnblogs.com/lori/p/9811526.html
