springcloud config

分布式配置中心(Spring Cloud Config)(Finchley版本)

在分布式系统中，由于服务数量巨多，为了方便服务配置文件统一管理，实时更新，所以需要分布式配置中心组件。在Spring Cloud中，有分布式配置中心组件spring cloud config ，它支持配置服务放在配置服务的内存中（即本地），也支持放在远程Git仓库中。

在原有项目的基础上 新增model，cloud-config-server，引入依赖

<?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>com.zhaowb.springcloud</groupId>
    <artifactId>cloud-config-server</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>cloud-config-server</name>
    <description>Demo project for Spring Boot</description>
    <parent>
        <groupId>com.example</groupId>
        <artifactId>cloud-demo</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-config-server</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

配置application.yml

server:
  port: 8769
spring:
  application:
    name: cloud-config-server
  cloud:
    config:
      server:
        git:
          uri: https://gitee.com/JiShiMoWang_admin/cloud-demo-config.git
          default-label: master

我的不能使用SSH ，暂未解决。

在启动类上添加@EnableConfigServer

package com.zhaowb.springcloud.cloudconfigserver;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.config.server.EnableConfigServer;

@SpringBootApplication
@EnableConfigServer
public class CloudConfigServerApplication {

    public static void main(String[] args) {
        SpringApplication.run(CloudConfigServerApplication.class, args);
    }
}

gitee上的配置为

spring:
  profiles:
    active:
    - dev
---
spring:
  profiles: dev
  application:
    name: cloud-config-server-dev
---
spring:
  profiles: test
  application:
    name: cloud-config-server-test

在浏览器输入http://localhost:8769/cloud-config-server-test.yml 显示

spring:
  application:
    name: cloud-config-server-test
  profiles:
    active:
    - dev

输入http://localhost:8769/cloud-config-server-dev.yml，显示

spring:
  application:
    name: cloud-config-server-dev
  profiles:
    active:
    - dev

说明配置生效。

http请求地址和资源文件映射如下:

• /{application}/{profile}[/{label}]

• /{application}-{profile}.yml

• /{label}/{application}-{profile}.yml

• /{application}-{profile}.properties

• /{label}/{application}-{profile}.properties

都可以获取配置信息，看个人喜好选择。

高可用的分布式配置中心(Spring Cloud Config)

当服务实例很多时，都从配置中心读取文件，这时可以考虑将配置中心做成一个微服务，将其集群化，从而达到高可用，创建model，cloud-config-eureka-server、cloud-config-dept-client，

在server中引入依赖

<?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>com.zhaowb.springcloud</groupId>
    <artifactId>cloud-config-eureka-server</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>cloud-config-eureka-server</name>
    <description>Demo project for Spring Boot</description>
    <parent>
        <groupId>com.example</groupId>
        <artifactId>cloud-demo</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-config-server</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

配置bootstrap.yml

spring:
  cloud:
    config:
      name: cloud-config-eureka-server
      uri: http://localhost:8769/
      label: master

配置application.yml

spring:
  application:
    name: cloud-config-eureka-server

eureka:
  instance:
    hostname: localhost
  client:
    registerWithEureka: false
    fetchRegistry: false
    serviceUrl:
      defaultZone: http://localhost:8770/eureka/
server:
  port: 8770

原计划是将application.yml 放到git上，但是在实际操作中未能实现，暂未找到原因。可能是eureka-server 无法从git获取信息，或我配置文件错误。

在启动类上加上注解

package com.zhaowb.springcloud.cloudconfigeurekaserver;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@EnableEurekaServer
@RestController
public class CloudConfigEurekaServerApplication {

    @Value("${file.name:mojhap}")
    private String fileName;
    public static void main(String[] args) {
        SpringApplication.run(CloudConfigEurekaServerApplication.class, args);
    }
    @RequestMapping(value = "/getFileName",method = RequestMethod.GET)
    public String getFileName(){
        return fileName;
    }
}

cloud-config-dept-client ，引入依赖

<?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>com.zhaowb.springcloud</groupId>
    <artifactId>cloud-config-dept-client</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>cloud-config-dept-client</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>com.example</groupId>
        <artifactId>cloud-demo</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <dependencies>
        <dependency>
            <groupId>com.zhaowb.springcloud</groupId>
            <artifactId>cloud-api</artifactId>
            <version>${project.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</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-netflix-eureka-client</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.10</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.mybatis.spring.boot/mybatis-spring-boot-starter -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

配置bootstrap.yml

spring:
  cloud:
    config:
      name: cloud-config-dept-client # 需要从github上读取的资源名称，注意没有yml后缀名
      uri: http://localhost:8769/  # SpringCloudConfig获取的服务地址
      label: master

配置application.yml

spring:
  application:
    name: cloud-config-dept-client

启动类加上注解

package com.zhaowb.springcloud.cloudconfigdeptclient;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication
@EnableEurekaClient
@EnableDiscoveryClient
public class CloudConfigDeptClientApplication {

    public static void main(String[] args) {
        SpringApplication.run(CloudConfigDeptClientApplication.class, args);
    }
}

其余的将eureka-hi的复制过来，修改一下使用。

git上配置

server:
  port: 8771
mybatis:
  config-location: classpath:mybatis/mybatis.cfg.xml        # mybatis配置文件所在路径
  type-aliases-package: com.zhaowb.springcloud.cloudapi.entities   # 所有Entity别名类所在包
  mapper-locations:
  - classpath:/mybatis/mapper/**/*.xml                       # mapper映射文件

spring:
  application:
    name: cloud-config-dept-client
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource            # 当前数据源操作类型
    driver-class-name: com.mysql.jdbc.Driver              # mysql驱动包
    url: jdbc:mysql://localhost:3306/cloudDB02              # 数据库名称
    username: root
    password: 308539393
    dbcp2:
      min-idle: 5                                           # 数据库连接池的最小维持连接数
      initial-size: 5                                       # 初始化连接数
      max-total: 5                                          # 最大连接数
      max-wait-millis: 200                                  # 等待连接获取的最大超时时间

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8770/eureka/
  instance:
    instance-id: cloud-config-dept-client
    prefer-ip-address: true
info:
  app.name: cloud-config-dept-client
  company.name: www.zhaowb.com
  build.artifactId: $project.artifactId$    # 这样写在idea 中运行出来不显示版本号，直接显示 $project.artifactId$ 字符串，可以自己修改
  build.version: $project.version$

在浏览器输入http://localhost:8771/dept/list，显示[{"deptno":1,"dname":"部门1","db_source":"clouddb02"},{"deptno":2,"dname":"部门2","db_source":"clouddb02"},{"deptno":3,"dname":"部门3","db_source":"clouddb02"},{"deptno":4,"dname":"部门4","db_source":"clouddb02"},{"deptno":5,"dname":"部门5","db_source":"clouddb02"},{"deptno":6,"dname":"部门6","db_source":"clouddb02"}]

修改数据库， 改为url: jdbc:mysql://localhost:3306/cloudDB01 # 数据库名称

重新启动，只要显示的"db_source":"clouddb01"，即为成功。

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