spring-cloud demo

踩在巨人的肩膀上搭建了spring-cloud的demo，并且实现了服务的注册和发现、熔断、网关、负载、统一配置、消息总线等最简单的列子。
项目源码：http://git.oschina.net/siliangysd/spring-cloud
项目结构图：

eureka-server：服务注册中心
config-server：统一配置
zuul：网关服务
clienta、clientb ：客户端
service-a、service-b：服务端

1、首先创建一个父项目：pom.xml

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">    <modelVersion>4.0.0</modelVersion>    <groupId>cn.cloud</groupId>    <artifactId>demo</artifactId>    <version>0.0.1-SNAPSHOT</version>    <modules>        <module>eureka-server</module>        <module>service-a</module>        <module>clienta</module>        <module>service-b</module>        <module>clientb</module>        <module>zuul</module>        <module>config-server</module>    </modules>    <packaging>pom</packaging>    <name>demo</name>    <description>Demo project for Spring Boot</description>    <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>1.5.4.RELEASE</version>        <relativePath/> <!-- lookup parent from repository -->    </parent>    <properties>        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>        <java.version>1.8</java.version>        <spring-cloud.version>Dalston.SR1</spring-cloud.version>    </properties>    <dependencies>        <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>spring-cloud-starter-eureka-server</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-test</artifactId>            <scope>test</scope>        </dependency>    </dependencies>    <dependencyManagement>        <dependencies>            <dependency>                <groupId>org.springframework.cloud</groupId>                <artifactId>spring-cloud-dependencies</artifactId>                <version>${spring-cloud.version}</version>                <type>pom</type>                <scope>import</scope>            </dependency>        </dependencies>    </dependencyManagement>    <build>        <plugins>            <plugin>                <groupId>org.springframework.boot</groupId>                <artifactId>spring-boot-maven-plugin</artifactId>            </plugin>        </plugins>    </build></project>

2、新建eureka-server工程
pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">  <parent>    <artifactId>demo</artifactId>    <groupId>cn.cloud</groupId>    <version>0.0.1-SNAPSHOT</version>  </parent>  <modelVersion>4.0.0</modelVersion>  <artifactId>eureka</artifactId>  <packaging>jar</packaging>  <name>eureka</name>  <url>http://maven.apache.org</url>  <properties>    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>  </properties>  <dependencies>    <dependency>      <groupId>org.springframework.cloud</groupId>      <artifactId>spring-cloud-starter-eureka-server</artifactId>    </dependency>  </dependencies></project>

application.yml

server:  port: 8010 #服务端口eureka:  instance:    hostname: localhost  server:    enable-self-preservation: false    eviction-interval-timer-in-ms: 4000  client:    register-with-eureka: false #是否将eureka自身作为应用注册到eureka注册中心    fetch-registry: false #为true时，可以启动，但报异常：Cannot execute request on any known server    serviceUrl:      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

启动服务，访问localhost:8010

2、创建项目service-a
pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">    <parent>        <artifactId>demo</artifactId>        <groupId>cn.cloud</groupId>        <version>0.0.1-SNAPSHOT</version>    </parent>    <modelVersion>4.0.0</modelVersion>    <artifactId>service-a</artifactId>    <packaging>jar</packaging>    <name>service-a</name>    <url>http://maven.apache.org</url>    <properties>        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>    </properties>    <dependencies>        <dependency>            <groupId>junit</groupId>            <artifactId>junit</artifactId>            <version>3.8.1</version>            <scope>test</scope>        </dependency>    </dependencies></project>

application.yml

spring:  application:    name: service-aserver:  port: 8810eureka:  client:    serviceUrl:          defaultZone: http://localhost:8010/eureka/ #eureka服务注册地址

启动服务，再次访问localhost:8010

如图看到多出一个service-a的服务，注册、发现成功。
3、创建service-b项目 和service-a项目一致，将端口号修改一下。
a)如果需要测试负载请将application.yml 里的name 改为一致，启动

可以看到service-a的服务里有2台
b)如果测试网关请将name 改为不一致。

4、创建clienta项目
pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">    <parent>        <artifactId>demo</artifactId>        <groupId>cn.cloud</groupId>        <version>0.0.1-SNAPSHOT</version>    </parent>    <modelVersion>4.0.0</modelVersion>    <artifactId>client-a</artifactId>    <packaging>jar</packaging>    <name>client-a</name>    <url>http://maven.apache.org</url>    <properties>        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>    </properties>    <dependencies>        <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>spring-cloud-starter-hystrix</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>spring-cloud-starter-config</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>spring-cloud-starter-bus-amqp</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-actuator</artifactId>        </dependency>    </dependencies></project>

bootstrap.yml

server:  port: 8910eureka:  client:    healthcheck:      enabled: true    serviceUrl:          defaultZone: http://localhost:8010/eureka/    instance:        lease-expiration-duration-in-seconds: 30        lease-renewal-interval-in-seconds: 10spring:  application:      name: client-a  cloud:      config:        discovery:          enabled: true          service-id: config-server        profile: dev        label: master      rabbitmq:            host: localhost            port: 5672            username: guest            password: guestmanagement:  security:    enabled: false

在ClientApplication里开启@EnableHystrix 熔断注解
controller里的方法上可以添加 @HystrixCommand(fallbackMethod = “error”)
error 为方法名：

package cn.cloud.controller;import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Value;import org.springframework.cloud.context.config.annotation.RefreshScope;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.bind.annotation.RestController;import org.springframework.web.client.RestTemplate;/** * Created by Administrator on 2017/6/29. */@RestController@RefreshScopepublic class TestController {    @Autowired    RestTemplate restTemplate;    @Value("${ip}")    private String ip;    @Value("${port}")    private String port;    @RequestMapping("/hi")    @HystrixCommand(fallbackMethod = "error")    public String hi(@RequestParam String id){        return restTemplate.getForObject("http://service-a/hi?id="+id, String.class);    }    public String  error(String id){        return "hi, " + id + ", error!";    }    @RequestMapping("/getProperties")    public String getProperties(){        return ip + " : " + port;    }}

5、clientb 项目
使用Feign来实现，具体见代码

6、创建config-server
application.yml

server:  port: 8030eureka:  client:    serviceUrl:          defaultZone: http://localhost:8010/eureka/ #eureka服务注册地址# git管理配置spring:  cloud:    config:      server:        git:          uri: http://git.oschina.net/siliangysd/spring-cloud #git仓库地址          searchPaths: demo* #搜索路径          username:            password:    application:    name: config-servermanagement:  security:    enabled: false

注意security这里的配置，这边我关闭了 不然消息总线的刷新会被拦截。

7、最后就是zuul了
主要是application.yml配置

spring:  application:    name: zuulserver:  port: 8020eureka:  client:    service-url:      defaultZone: http://localhost:8010/eureka/zuul:  routes:    api-a:      path: /service-a/**      serviceId: service-a    api-b:      path: /service-b/**      serviceId: service-b  sensitive-headers:  #设置忽略的头信息，设置为空能解决会话保持问题  add-host-header: true #设为true才能保持Host头信息处理正确

ps：测试统一配置的刷新 ，需要rabbitmq的支持。
详见：http://www.cnblogs.com/andyfengzp/p/6830679.html 这篇文章 。