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：
實踐一下
1 添加依賴
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: 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
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
@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VeVb武林網網站的支持！
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