網關在微服務里的角色
在微服務架構體系里，網關是非常重要的一個環節，它主要實現了一些功能的統一處理，包括了：
- 統一授權
- 統一異常處理
- 路由導向
- 跨域處理
- 限流
實踐一下
1 添加依賴
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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開頭的路徑被重定向到lind服務 serviceid: lind add-host-header: true #顯示真實的http頭 retryable: false #關閉hystrix的重試功能 ratelimit: enabled: true # repository: redis behind-proxy: true policies: users: limit: 5 #限流，每分鐘請求5次 refresh-interval: 60 type: - user - origin - url # url類型的限流就是通過請求路徑區分 # origin是通過客戶端ip地址區分 # user是通過授權用戶進行區分，也包括匿名用戶 |
3 添加實現代碼
http攔截器，獲取用戶id，為子服務進行傳遞
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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");//向子系統http頭寫數據 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() { // 判斷是否需要過濾 return true; } @override public string filtertype() { return filterconstants.pre_type; } @override public int filterorder() { return ordered.highest_precedence; }} |
在主程中注入這個過濾器
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@bean public prerequestlogfilter prerequestlogfilter() { return new prerequestlogfilter(); } |
4 使用它
在url上通過localhost:8300/users/home 將進行lind服務里的home控制器下，并在http頭上寫入了userid和username這個鍵值對！
總結
以上所述是小編給大家介紹的springboot zuul實現網關，希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回復大家的。在此也非常感謝大家對服務器之家網站的支持！
原文鏈接：http://www.cnblogs.com/lori/p/9811526.html
