SpringCloud (first day)

1. The single application: all resources in an application, packaged as a war package, a Tomcat run, run in one process.

a) Solution: You can do a cluster, but is not convenient local extension (separate clusters for one module), maintenance, development, upgrade trouble, a single technology selection, selection of a single database

2. Micro services: a system of multiple small services, each focused on a business each service has its own processes, data exchange between micro services through a network communication protocol (. Usually delivered using HTTP restFul style )

a) Advantage: diversified technology selection, database selection diversified, easy to maintain, easy to do local development, each service has a separate process

b) Dubbo和SpringCloud

I. Dubbo the RPC communication protocol (TCP-based communication)

II. SpringCloud HTTP communication protocol of TCP in a package, in terms of performance with respect to low Dubbo

3.SpringCloud

a) micro-Services

b) Maven build multi-module environment.

　　i. a parent project to build a module

Pom.xml file

<?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.itsource</groupId>
    <artifactId>springboot-parent</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
    <modules>
         //父项目的各个子模块项目
        <module>springboot-eureka</module>
        <module>springboot-userclient</module>
        <module>springboot-deptprovider</module>
    </modules>

    <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>Finchley.SR1</spring-cloud.version>
        <springboot.version>2.0.5.RELEASE</springboot.version>
    </properties>

    <!--版本依赖管理工具-->
    <dependencyManagement>
        <dependencies>
            <!--springboot版本控制-->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--springCloud版本控制-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${springboot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
</project>

ii. registry server environment to build

Package guide pom.xml

<dependencies>
    <!--springboot支持-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <!--Eureka服务端支持-->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
// spring-cloud-starter-netflix-eureka-server包含了spring-cloud-starter-netflix-eureka-client包
    </dependency>
</dependencies>

Application.yml profile configuration

the Spring: 
  the Application: 
    name: the Spring -cloud- Eureka 
Server: 
  Port: 7001 
Eureka: 
  instance: 
    hostname: localhost 
  Client: # is not registered with the Eureka own 
    the Register
     the -with-Eureka: false 
    # Do not check other EurekaServer node 
    FETCH -registry: false 
    service - url: 
      # set address eureka server is located, tracking and registration procedures are registered to this address (the address of the service exposure) 
      defaultzone: HTTP: // $ {eureka.instance.hostname}: $ {} server.port / eureka /

Registry service startup class

@SpringBootApplication
@EnableEurekaServer
public class SpringBootApplicationConfig_7001 {
    public static void main(String[] args) {
        SpringApplication.run(SpringBootApplicationConfig_7001.class,args);
    }
}

iii. Consumers and providers to build the client environment

Pom.xml

<dependencies>
    <!--springboot支持-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <!--Eureka服务端支持-->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
    </dependency>
</dependencies>

　　　2.Application.yml profile configuration

the Spring: 
  the Application: 
    name: SPRING -CLOUD- the USER 
Server: 
  Port: 8001 
eureka: 
  instance: 
    hostname: localhost 
  Client: 
    Service - url: 
      # Set address eureka server is located, tracking and registration procedures are registered to this address (service exposed address) 
      #defaultZone: HTTP: // $ {} eureka.instance.hostname: the server.port} {$ / Eureka / 
      defaultzone: HTTP: // localhost: 7001 / Eureka

3. Register to the registry: Client service startup class

@SpringBootApplication
@EnableEurekaClient
public class SpringbootApplication_8001 {

    public static void main(String[] args) {
        SpringApplication.run(SpringbootApplication_8001.class,args);
    }
}

If there is more than one service, you set up multiple sub-modules in the parent module below, do the same configuration service registration to the registry.

SpringCloud (first day)

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