一个简单地SpringCloud项目

本文介绍了一个最简单的SpringCloud项目，有注册中心eureka、生产者、消费者三部分组成。
一、注册中心配置

pom.xml文件
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.qi</groupId>
    <artifactId>eureka-server</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>eureka-server</name>
    <description>eureka-server project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Hoxton.RC2</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</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>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </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>

    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
        </repository>
    </repositories>

</project>

application.yml文件
server:
  port: 8761
eureka:
  instance:
    hostname: eureka-server
  client:
    register-with-eureka: false  #不把自己注册到注册中心，因为本身就是注册中心的存在
    fetch-registry: false  #不从eureka上获取注册信息
    service-url:
      defaultZone: http://localhost:8761/eureka  #配置默认的启动路径

springboot启动类：EurekaServerApplication.java
@EnableEurekaServer
@SpringBootApplication
public class EurekaServerApplication {

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

}

二、生产者

application.yml文件
server:
  port: 8082
spring:
  application:
    name: provider
  rabbitmq:     //配置RabbitMQ
    host: localhost
    port: 5672
    username: guest
    password: guest
  datasource:      //配置数据库
    username: root
    password: root
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/springboot?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=UTC
mybatis:
  mapper-locations: classpath:mapping/*Mapper.xml
  type-aliases-package: com.qi.entity
eureka:
  instance:
    prefer-ip-address: true  #注册服务的时候使用服务的IP地址
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka
    register-with-eureka: true
    ##检索服务信息
    fetch-registry: true

启动类：ProviderApplication .java
@MapperScan("com.qi.mapper")
@SpringBootApplication
@EnableEurekaClient
public class ProviderApplication {

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

}

三、消费者

application.yml文件
server:
  port: 8083
spring:
  application:
    name: consumer
  rabbitmq:
    host: localhost
    port: 5672
    username: guest
    password: guest
  thymeleaf:
    cache: false #开发时关闭缓存,不然没法看到实时页面
    prefix: classpath:/templates/
    suffix: .html
    encoding: UTF-8
    mode: HTML5
    servlet:
      content-type: text/html
eureka:
  instance:
    prefer-ip-address: true
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka

启动类：ConsumerApplication .java
@EnableDiscoveryClient  // 开启发现服务
@SpringBootApplication
@EnableHystrix     //启动容错保护
@ServletComponentScan("com.qi.servlet")
public class ConsumerApplication {

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

    @LoadBalanced // 启用负载均衡服务
    @Bean
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }

}

一个简单的SpringCloud项目就这样就可以搭建完成，启动顺序是：注册中心eureka、生产者、消费者。项目详情见GitHub地址：https://github.com/Q631124/SpringCloud