Spring全家桶——SpringCloud单项目多端口启动

IDEA 微服务单项目多端口启动

网上教程具体如下图

image

注册中心,开了N个端口就创建了N个Module
还有的就是各种创建eureka然后互相注册，对于新手来说是很大的误解
以及在client去注册的时候，注册中心要写几个
下面开始叙述并实际验证下

准备工作

当前的技术以及工具

IDEA2018.3
JDK1.8
Gradle 5.0
tomcat 7

需要你对基本的微服务有一点点的了解，如果不知道什么是微服务，百度基本学习下也不会花很长时间

首先创建公共依赖管理

image

一步一步创建一个Gradle的初始项目就可以了
配置文件

gradle.perproties
无此文件自行创建

## dependency versions.
springBootVersion=2.1.2.RELEASE
springCloudVersion=Finchley.RELEASE
### docker configuration
#gradle docker plugin version
transmodeGradleDockerVersion=1.2
#This configuration is for docker container environment to access the local machine host，in Chinese is "宿主机" ip.
hostMachineIp=127.0.0.1

build.gradle

buildscript {
    repositories {
        maven { url 'http://maven.aliyun.com/nexus/content/groups/public/' }
        maven { url "https://oss.sonatype.org/content/groups/public/" }
        maven { url "https://repo.spring.io/libs-milestone/" }
        jcenter()
        mavenCentral()
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
    }
}

allprojects {
    apply plugin: 'java'
    apply plugin: 'org.springframework.boot'
    apply plugin: 'io.spring.dependency-management'

    group = 'store.zabbix'
    version = '0.0.1-SNAPSHOT'
    sourceCompatibility = '1.8'


    repositories {
        maven { url 'http://maven.aliyun.com/nexus/content/groups/public/' }
        maven { url "https://oss.sonatype.org/content/groups/public/" }
        maven { url "https://repo.spring.io/libs-milestone/" }
        jcenter()
        mavenCentral()
    }

    dependencies {
        implementation 'org.springframework.boot:spring-boot-starter-web'
        testImplementation "org.springframework.boot:spring-boot-starter-test"
    }


    dependencyManagement {
        imports {
            mavenBom "org.springframework.cloud:spring-cloud-dependencies:${springCloudVersion}"
        }
    }
}

setting.gradle

rootProject.name = 'springcloud-tools'
def dir = new File(settingsDir.toString())
def projects = new HashSet()
def projectSymbol = File.separator + 'src'

dir.eachDirRecurse { subDir ->
    def subDirName = subDir.canonicalPath
    def isSubProject = true
    if (subDirName.endsWith(projectSymbol)) {
        for (String projectDir in projects) {
            if (subDirName.startsWith(projectDir)) {
                isSubProject = false
                break
            }
        }
        if (isSubProject) {
            projects << subDirName
            def lastIndex = subDirName.lastIndexOf(projectSymbol)
            def gradleModulePath = subDirName.substring(dir.canonicalPath.length(), lastIndex).replace(File.separator, '')
            println "include " + gradleModulePath
            include gradleModulePath
        }
    }
}
//include('tools-eureka')

至此我们创建了一个新的项目，结构图

image

红色圈内的后续创建

我们开始创建eureka-server

build.gradle
其依赖已在父类公共管理
这里只需要声明现在所需要的依赖即可

dependencies {
    implementation 'org.springframework.cloud:spring-cloud-starter-netflix-eureka-server'
    testImplementation 'org.springframework.boot:spring-boot-starter-test'
}

application.yml

spring:
  application:
    name: eureka-server
  profiles:
    active: server1

application-server1.yml

server:
  port: 8000
eureka:
  client:
    # 表示是否注册自身到eureka服务器
    # register-with-eureka: false
    # 是否从eureka上获取注册信息
    # fetch-registry: false
    service-url:
      defaultZone: http://127.0.0.1:8001/eureka/,http://127.0.0.1:8002/eureka/

application-server2.yml

server:
  port: 8001
eureka:
  client:
    # 表示是否注册自身到eureka服务器
    # register-with-eureka: false
    # 是否从eureka上获取注册信息
    # fetch-registry: false
    service-url:
      defaultZone: http://127.0.0.1:8000/eureka/,http://127.0.0.1:8002/eureka/
#spring:
#  application:
#    name: eurka-server2

applicayion-server3.yml

server:
  port: 8002
eureka:
  client:
    # 表示是否注册自身到eureka服务器
    # register-with-eureka: false
    # 是否从eureka上获取注册信息
    # fetch-registry: false
    service-url:
      defaultZone: http://127.0.0.1:8001/eureka/,http://127.0.0.1:8000/eureka/
#spring:
#  application:
#    name: eurka-server3

ToolsEurekaApplication.java

核心:注解@EnableEurekaServer

@EnableEurekaServer
@SpringBootApplication
public class ToolsEurekaApplication {

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

}

创建eureka-client来注册到eureka-server

快速创建一个Gradle的SpringBoot项目

build.gradle

dependencies {
    implementation 'org.springframework.cloud:spring-cloud-starter-netflix-eureka-client'
}

ToolsEurekaClientApplication.java

核心注解：@EnableEurekaClient

package store.zabbix.toolseurekaclient;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@EnableEurekaClient
@RestController
public class ToolsEurekaClientApplication {

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

    @Value("${server.port}")
    private int port;

    @GetMapping("test")
    public String showPort(){
        return "my port is "+port ;
    }

}

application.yml

eureka:
  client:
    service-url:
      defaultZone: http://127.0.0.1:8000/eureka/
server:
  port: 8762
spring:
  application:
    name: tools-eureka-client

开始启动eureka-server

新建启动类并配置

image

第一次启动启动类之后会存在一个启动配置
如上图一样去复制一个，然后在options里指定一下你需要启动的项目资源配置文件

-Dspring.profiles.active=server2

启动配置的名字可以自定义
建议带上端口

image

上图得知我们已经启动了3个端口，并互相注册了

image

已经相互注册成功了
接下来我们把注释的开启

# 表示是否注册自身到eureka服务器 
# register-with-eureka: false
# 是否从eureka上获取注册信息
# fetch-registry: false

修改后的application.yml

#server:
#  port: 8761
eureka:
#  instance:
#    hostname: server1
  client:
    register-with-eureka: false
    fetch-registry: false
#    service-url:
#      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
##server.port: 指明了应用启动的端口号
##eureka.instance.hostname: 应用的主机名称
##eureka.client.registerWithEureka: 值为false意味着自身仅作为服务器，不作为客户端
##eureka.client.fetchRegistry: 值为false意味着无需注册自身
##eureka.client.serviceUrl.defaultZone: 指明了应用的URL
#spring:
#  application:
#    name: eurka-server
spring:
  application:
    name: eureka-server
  profiles:
    active: server1

之后把三个端口的都重启下

image

可以看到不会注册自己的，我想基础区别也在这个界面了

启动顺序 eureka-server => eureka-client

启动eureka-client

image

看到这里我们访问的是http://127.0.0.1:8002/
虽然我们配置的是8000端口
但还是在8002端口注册了，也就是这也是eureka互相注册之后达到的高可用的效果，集群，我们可以把8000和8001端口宕掉，不影响使用

提示

上面的启动配置是需要启动几个端口就要配置几个
项目跑起来的时候有时候会抛些错误，试着重启下，访问下如果正常就可以，一般就是超时或者自己寻找不到注册自己的服务中心
VM options:-Dspring.profiles.active=xxx,启动类这里配置的是你application-xxx.yml名字里的xxx，-D是用java默认原生属性
3.除了上面那样指定配置文件，还可以用Program arguments来指定

image

4.源码地址:https://github.com/cuifuan/springcloud-tools

本文参考
https://github.com/happyyangyuan/springcloud-quickstart
http://www.cnblogs.com/hfultrastrong/p/8547236.html