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spring Cloud Netflix

Eureka 服务注册与发现

<!-- Spring Cloud Begin -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>
        <!-- Spring Cloud End -->

@EnableEurekaServer:启动一个服务注册中心
配置:application.yml

spring:
  application:
    name: itoken-eureka
  boot:
    admin:
      client:
        url: http://localhost:8084
  zipkin:
    base-url: http://localhost:9411

server:
  port: 8761
eureka:
  instance:
    hostname: host
  client:
    registerWithEureka: true
    fetchRegistry: true
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

management:
  endpoint:
    health:
      show-details: always
  endpoints:
    web:
      exposure:
        include: health,info

服务提供者

 <!-- Spring Cloud Begin -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>
        <!-- Spring Cloud End -->

@EnableEurekaClient 表明自己是一个 Eureka Client
配置application.yml

spring:
  application:
    name: hello-spring-cloud-service-admin

server:
  port: 8762

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

服务消费者（Feign）

<!-- Spring Cloud Begin -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
        <!-- Spring Cloud End -->

@EnableDiscoveryClient :注解注册到服务中心
@EnableFeignClients: 注解开启 Feign 功能
配置application.yml
设置程序端口号为：8765

spring:
  application:
    name: hello-spring-cloud-web-admin-feign
  thymeleaf:
    cache: false
    mode: LEGACYHTML5
    encoding: UTF-8
    servlet:
      content-type: text/html

server:
  port: 8765

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

@FeignClient("服务名"): 注解来指定调用哪个服务

@FeignClient(value = "hello-spring-cloud-service-admin")

熔断器防止服务雪崩hystrix

pom.xml

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
</dependency>

在 Service 中增加 fallback 指定类

package com.funtl.hello.spring.cloud.web.admin.feign.service;

import com.funtl.hello.spring.cloud.web.admin.feign.service.hystrix.AdminServiceHystrix;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

@FeignClient(value = "hello-spring-cloud-service-admin", fallback = AdminServiceHystrix.class)
public interface AdminService {

    @RequestMapping(value = "hi", method = RequestMethod.GET)
    public String sayHi(@RequestParam(value = "message") String message);
}

创建熔断器类并实现对应的 Feign 接口

package com.funtl.hello.spring.cloud.web.admin.feign.service.hystrix;

import com.funtl.hello.spring.cloud.web.admin.feign.service.AdminService;
import org.springframework.stereotype.Component;

@Component
public class AdminServiceHystrix implements AdminService {

    @Override
    public String sayHi(String message) {
        return "Hi，your message is :"" + message + "" but request error.";
    }
}

熔断器仪表盘监控HystrixDashboard

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId>
</dependency>

@EnableHystrixDashboard

@SpringBootApplication
@EnableDiscoveryClient
@EnableHystrix
@EnableHystrixDashboard
public class WebAdminRibbonApplication {
    public static void main(String[] args) {
        SpringApplication.run(WebAdminRibbonApplication.class, args);
    }
}

创建 hystrix.stream 的 Servlet 配置

Spring Boot 2.x 版本开启 Hystrix Dashboard 与 Spring Boot 1.x 的方式略有不同，需要增加一个 HystrixMetricsStreamServlet 的配置，代码如下：

package com.funtl.hello.spring.cloud.web.admin.ribbon.config;

import com.netflix.hystrix.contrib.metrics.eventstream.HystrixMetricsStreamServlet;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class HystrixDashboardConfiguration {

    @Bean
    public ServletRegistrationBean getServlet() {
        HystrixMetricsStreamServlet streamServlet = new HystrixMetricsStreamServlet();
        ServletRegistrationBean registrationBean = new ServletRegistrationBean(streamServlet);
        registrationBean.setLoadOnStartup(1);
        registrationBean.addUrlMappings("/hystrix.stream");
        registrationBean.setName("HystrixMetricsStreamServlet");
        return registrationBean;
    }
}

路由网关统一访问接口Zuul

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
</dependency>

@EnableZuulProxy: 注解开启 Zuul 功能
application.yml
- 设置端口号为：8769
- 增加 Zuul 配置

spring:
  application:
    name: hello-spring-cloud-zuul

server:
  port: 8769

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

zuul:
  routes:
    api-a:
      path: /api/a/**
      serviceId: hello-spring-cloud-web-admin-ribbon
    api-b:
      path: /api/b/**
      serviceId: hello-spring-cloud-web-admin-feign

配置网关路由失败时的回调

package com.funtl.hello.spring.cloud.zuul.fallback;

import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;

/**
 * 路由 hello-spring-cloud-web-admin-feign 失败时的回调
 * <p>Title: WebAdminFeignFallbackProvider</p>
 * <p>Description: </p>
 *
 * @author Lusifer
 * @version 1.0.0
 * @date 2018/7/27 6:55
 */
@Component
public class WebAdminFeignFallbackProvider implements FallbackProvider {

    @Override
    public String getRoute() {
        // ServiceId，如果需要所有调用都支持回退，则 return "*" 或 return null
        return "hello-spring-cloud-web-admin-feign";
    }

    /**
     * 如果请求服务失败，则返回指定的信息给调用者
     * @param route
     * @param cause
     * @return
     */
    @Override
    public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
        return new ClientHttpResponse() {
            /**
             * 网关向 api 服务请求失败了，但是消费者客户端向网关发起的请求是成功的，
             * 不应该把 api 的 404,500 等问题抛给客户端
             * 网关和 api 服务集群对于客户端来说是黑盒
             * @return
             * @throws IOException
             */
            @Override
            public HttpStatus getStatusCode() throws IOException {
                return HttpStatus.OK;
            }

            @Override
            public int getRawStatusCode() throws IOException {
                return HttpStatus.OK.value();
            }

            @Override
            public String getStatusText() throws IOException {
                return HttpStatus.OK.getReasonPhrase();
            }

            @Override
            public void close() {

            }

            @Override
            public InputStream getBody() throws IOException {
                ObjectMapper objectMapper = new ObjectMapper();
                Map<String, Object> map = new HashMap<>();
                map.put("status", 200);
                map.put("message", "无法连接，请检查您的网络");
                return new ByteArrayInputStream(objectMapper.writeValueAsString(map).getBytes("UTF-8"));
            }

            @Override
            public HttpHeaders getHeaders() {
                HttpHeaders headers = new HttpHeaders();
                // 和 getBody 中的内容编码一致
                headers.setContentType(MediaType.APPLICATION_JSON_UTF8);
                return headers;
            }
        };
    }
}

路由网关的服务过滤功能

继承 ZuulFilter 类并在类上增加 @Component 注解就可以使用服务过滤功能了，非常简单方便

package com.funtl.hello.spring.cloud.zuul.filter;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

/**
 * Zuul 的服务过滤演示
 * <p>Title: LoginFilter</p>
 * <p>Description: </p>
 *
 * @author Lusifer
 * @version 1.0.0
 * @date 2018/5/29 22:02
 */
@Component
public class LoginFilter extends ZuulFilter {

    private static final Logger logger = LoggerFactory.getLogger(LoginFilter.class);

    /**
     * 配置过滤类型，有四种不同生命周期的过滤器类型
     * 1. pre：路由之前
     * 2. routing：路由之时
     * 3. post：路由之后
     * 4. error：发送错误调用
     * @return
     */
    @Override
    public String filterType() {
        return "pre";
    }

    /**
     * 配置过滤的顺序
     * @return
     */
    @Override
    public int filterOrder() {
        return 0;
    }

    /**
     * 配置是否需要过滤：true/需要，false/不需要
     * @return
     */
    @Override
    public boolean shouldFilter() {
        return true;
    }

    /**
     * 过滤器的具体业务代码
     * @return
     * @throws ZuulException
     */
    @Override
    public Object run() throws ZuulException {
        RequestContext context = RequestContext.getCurrentContext();
        HttpServletRequest request = context.getRequest();
        logger.info("{} >>> {}", request.getMethod(), request.getRequestURL().toString());
        String token = request.getParameter("token");
        if (token == null) {
            logger.warn("Token is empty");
            context.setSendZuulResponse(false);
            context.setResponseStatusCode(401);
            try {
                context.getResponse().getWriter().write("Token is empty");
            } catch (IOException e) {
            }
        } else {
            logger.info("OK");
        }
        return null;
    }
}

filterType

返回一个字符串代表过滤器的类型，在 Zuul 中定义了四种不同生命周期的过滤器类型

pre：路由之前
routing：路由之时
post：路由之后
error：发送错误调用

filterOrder

过滤的顺序

shouldFilter

是否需要过滤，这里是 true，需要过滤

run

过滤器的具体业务代码

分布式配置中心服务端config-server

pom.xml

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-config-server</artifactId>
</dependency>

@EnableConfigServer:开启配置服务器功能
application.yml

spring:
  application:
    name: itoken-config
  boot:
    admin:
      client:
        url: http://localhost:8084
  cloud:
    config:
      label: master
      server:
        git:
          uri: https://github.com/faramita-itoken/itoken-config.git
          search-paths: respo
          username: bsab123
          password: xjx397556048
  zipkin:
    base-url: http://localhost:9411

server:
  port: 8888

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

management:
  endpoint:
    health:
      show-details: always
  endpoints:
    web:
      exposure:
        include: health,info

respo文件

itoken-web-admin-dev

spring:
  application:
    name: itoken-web-admin
  boot:
    admin:
      client:
        url: http://localhost:8084
  zipkin:
    base-url: http://localhost:9411
  thymeleaf:
    cache: false
    mode: LEGACYHTML5
    encoding: UTF-8
    servlet:
      content-type: text/html

server:
  port: 8601

feign:
  hystrix:
    enabled: true

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

management:
  endpoint:
    health:
      show-details: always
  endpoints:
    web:
      exposure:
        include: health,info
  metrics:
    web:
      server:
        auto-time-requests: false

itoken-web-admin-prod

spring:
  application:
    name: itoken-web-admin
  boot:
    admin:
      client:
        url: http://139.224.117.172:8084
  zipkin:
    base-url: http://139.224.117.172:9411
  thymeleaf:
    cache: false
    mode: LEGACYHTML5
    encoding: UTF-8
    servlet:
      content-type: text/html

server:
  port: 8601

feign:
  hystrix:
    enabled: true

eureka:
  client:
    serviceUrl:
      defaultZone: http://139.224.117.172:9411:8761/eureka/,http://139.224.117.172:9411:8861/eureka/，http://139.224.117.172:9411:8961/eureka/

management:
  endpoint:
    health:
      show-details: always
  endpoints:
    web:
      exposure:
        include: health,info
  metrics:
    web:
      server:
        auto-time-requests: false

分布式配置中心客户端config

pom.xml

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-config</artifactId>
</dependency>

application.yml

spring:
  cloud:
    config:
      uri: http://localhost:8888
      name: itoken-eureka
      label: master
      profile: dev

ZipKin 服务链路追踪

pom.xml

 <!-- ZipKin Begin -->
        <dependency>
            <groupId>io.zipkin.java</groupId>
            <artifactId>zipkin</artifactId>
            <version>${zipkin.version}</version>
        </dependency>
        <dependency>
            <groupId>io.zipkin.java</groupId>
            <artifactId>zipkin-server</artifactId>
            <version>${zipkin.version}</version>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-log4j2</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>io.zipkin.java</groupId>
            <artifactId>zipkin-autoconfigure-ui</artifactId>
            <version>${zipkin.version}</version>
        </dependency>
        <!-- ZipKin End -->
         <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zipkin</artifactId>
        </dependency>

@EnableZipkinServer: 注解开启 Zipkin Server 功能
application.yml

设置端口号为：9411，该端口号为 Zipkin Server 的默认端口号

spring:
  application:
    name: hello-spring-cloud-zipkin

server:
  port: 9411

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

management:
  metrics:
    web:
      server:
        auto-time-requests: false

所有需要被追踪的项目（就当前教程而言，除了 dependencies 项目外都需要被追踪，包括 Eureka Server）中增加 spring-cloud-starter-zipkin 依赖

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-zipkin</artifactId>
</dependency>

在这些项目的 application.yml 配置文件中增加 Zipkin Server 的地址即可

spring:
  zipkin:
    base-url: http://localhost:9411

Spring Boot Admin 服务端

pom.xml

<dependency>
    <groupId>org.jolokia</groupId>
    <artifactId>jolokia-core</artifactId>
</dependency>
<dependency>
    <groupId>de.codecentric</groupId>
    <artifactId>spring-boot-admin-starter-server</artifactId>
</dependency>

@EnableAdminServer: 注解开启 Admin 功能
application.yml

spring:
  application:
    name: itoken-admin
  zipkin:
    base-url: http://localhost:9411

server:
  port: 8084

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

management:
  endpoint:
    health:
      show-details: always
  endpoints:
    web:
      exposure:
        include: health,info

Spring Boot Admin 客户端

pom.xml

<dependency>
    <groupId>org.jolokia</groupId>
    <artifactId>jolokia-core</artifactId>
</dependency>
<dependency>
    <groupId>de.codecentric</groupId>
    <artifactId>spring-boot-admin-starter-client</artifactId>
</dependency>

application.yml

设置端口号为：8085，并设置 Spring Boot Admin 的服务端地址

spring:
  application:
    name: hello-spring-cloud-admin-client
  boot:
    admin:
      client:
        url: http://localhost:8084
  zipkin:
    base-url: http://localhost:9411

server:
  port: 8085

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

主要增加了 Spring Boot Admin Client 相关配置

spring:
  boot:
    admin:
      client:
        url: http://localhost:8084

查看全文

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原文地址：https://www.cnblogs.com/faramita/p/11306075.html