Springcloud01

時間 2020-08-09

標籤 springcloud01 springcloud 简体版

原文原文鏈接

Springcloud簡介

pring Cloud是一系列框架的有序集合。它利用Spring Boot的開發便利性巧妙地簡化了分佈式系統基礎設施的開發，如服務發現註冊、配置中心、消息總線、負載均衡、斷路器、數據監控等，均可以用Spring Boot的開發風格作到一鍵啓動和部署。Spring Cloud並無重複製造輪子，它只是將目前各家公司開發的比較成熟、經得起實際考驗的服務框架組合起來，經過Spring Boot風格進行再封裝屏蔽掉了複雜的配置和實現原理，最終給開發者留出了一套簡單易懂、易部署和易維護的分佈式系統開發工具包。html

詳細介紹： https://baike.so.com/doc/25751000-26884657.htmljava

配套參考資料：mysql

https://projects.spring.io/spring-cloud/ springcloud項目官方主頁git

https://springcloud.cc/ springcloud中文網有很詳細的翻譯文檔 github

http://springcloud.cn/ springcloud中文論壇 web

Springcloud版本pom文件生成可藉助網站：算法

https://start.spring.io/spring

原有的單體項目最終會被演化成下面sql

這樣的架構解決了單體項目幾點問題：數據庫

一、zuul網關解決了服務調用安全性的問題

二、服務註冊與發現（註冊中心）eureka解決了各層服務耦合問題，它是微服務架構的核心，有它才能將單體項目拆解成微服務架構

三、Eureka集羣解決了微服務中，註冊中心宕機產生的問題

四、Ribbon負載均衡及Feign消費者調用服務，減少了各微服務服務器的訪問壓力，默認採用了經典的輪詢機制

五、熔斷器Hystrix解決了，微服務架構中服務器雪崩現象

六、服務監控（單機Dashboard與集羣turbine），方便運維人員查看微服務架構項目運行時，各個服務器的運行狀態

七、服務配置中心（springcloud config），用來經過github統一管理各個微服務的配置文件（yml文件）

入門案例

最簡單的微服務架構會有四個工程

父工程：microservice

通用模塊（M）：microservice-common

服務提供者（C）：microservice-student-provider-1001

服務消費者（C）：microservice-student-consumer-80

微服務架構注意點：

一、springboot、springcloud版本在父工程定義；

二、因爲通用模塊無需操做數據庫，springboot啓動默認會讀取數據庫，因此得添加如下註解 @SpringBootApplication(exclude={DataSourceAutoConfiguration.class, HibernateJpaAutoConfiguration.class})；

三、分佈式jpa須要在啓動類上添加@EntityScan("com.javaxl.*.*")；

四、消費者須要添加配置類獲取org.springframework.web.client.RestTemplate，springcloud底層是經過RestTemplate來調用提供者的服務的。

傳統項目拆分紅微服務架構圖

建立父工程microservice

父工程是一個maven項目，通常建立方式便可，父工程的主要用途是鎖定pom依賴包版本。因爲springcloud2X中止更新，這裏咱們採用穩定的低版本，配套的springboot版本爲1x版本

Pom.xml配置:

<?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.cjh</groupId>
  <artifactId>springcloud</artifactId>
  <version>1.0-SNAPSHOT</version>

  <name>springcloud</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>
<properties>
  <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  <maven.compiler.source>1.8</maven.compiler.source>
  <maven.compiler.target>1.8</maven.compiler.target>
  <druid.version>1.1.10</druid.version>
</properties>


<dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-dependencies</artifactId>
        <version>Edgware.SR4</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
      <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-dependencies</artifactId>
        <version>1.5.13.RELEASE</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
      <!--  鏈接池  -->
      <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid-spring-boot-starter</artifactId>
        <version>${druid.version}</version>
      </dependency>
    </dependencies>
  </dependencyManagement>

</project>

建立通用模塊microservice-common

通用模塊主要存放實體類、工具包等被整個微服務框架所使用的代碼。建立一個簡單的springboot模塊便可。相關代碼以下

pom.xml配置：

<?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>com.cjh</groupId>
        <artifactId>springcloud</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <artifactId>microservice-common</artifactId>


    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>



</project>

Student.java

package com.cjh.microservicecommon.entity;

import javax.persistence.*;
import java.io.Serializable;

@Entity
@Table(name="t_springcloud_student")
public class Student implements Serializable {
 
    private static final long serialVersionUID = 1L;
 
    @Id
    @GeneratedValue
    private Integer id;
     
    @Column(length=50)
    private String name;
     
    @Column(length=50)
    private String grade;
     
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getGrade() {
        return grade;
    }
    public void setGrade(String grade) {
        this.grade = grade;
    }
     
     
     
}

microserviceCommonApplication.java

package com.cjh.microservicecommon;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration;

@SpringBootApplication(exclude={DataSourceAutoConfiguration.class, HibernateJpaAutoConfiguration.class})
public class MicroserviceCommonApplication {

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

}

建立服務提供者：microservice-student-provider-1001

建立一個簡單的springboot模塊，這裏服務提供者須要操做數據庫而且被瀏覽器所訪問，固須要添加相關配置以下

pom.xml配置：

<?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>com.cjh</groupId>
        <artifactId>springcloud</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <artifactId>microservice-student-provider-1001</artifactId>

    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>com.javaxl</groupId>
            <artifactId>microservice-common</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>com.cjh</groupId>
            <artifactId>microservice-common</artifactId>
            <version>1.0-SNAPSHOT</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-netflix-eureka-client</artifactId>
            <version>1.4.5.RELEASE</version>
            <scope>compile</scope>
        </dependency>
        <!--  修改後當即生效，熱部署  -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>springloaded</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>

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

</project>

application.yml

server:
  port: 1001
  context-path: /
spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/t224?useUnicode=true&characterEncoding=utf8
    username: root
    password: 123
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true

MicroserviceStudentProvider1001Application.java

package com.cjh.microservicestudentprovider1001;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@EntityScan("com.cjh.*.*")
@EnableEurekaClient
@SpringBootApplication
public class MicroserviceStudentProvider1001Application {

    public static void main(String[] args) {
        SpringApplication.run(MicroserviceStudentProvider1001Application.class, args);
    }

}

StudentRepository.java

package com.cjh.microservicestudentprovider1001.repository;


import com.cjh.microservicecommon.entity.Student;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
import org.springframework.stereotype.Repository;

@Repository
public interface StudentRepository extends JpaRepository<Student, Integer>, JpaSpecificationExecutor<Student> {
 
}

StudentService.java

package com.cjh.microservicestudentprovider1001.service;



import com.cjh.microservicecommon.entity.Student;

import java.util.List;

public interface StudentService {
 
    public void save(Student student);
     
    public Student findById(Integer id);
     
    public List<Student> list();
     
    public void delete(Integer id);
     
     
}

StudentServiceImpl.java

package com.cjh.microservicestudentprovider1001.service.impl;

import com.cjh.microservicecommon.entity.Student;
import com.cjh.microservicestudentprovider1001.repository.StudentRepository;
import com.cjh.microservicestudentprovider1001.service.StudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * @author
 * @site
 * @company
 * @create 2019-11-18 18:02
 */
@Service
public class StudentServiceImpl implements StudentService {
    @Autowired
    private StudentRepository studentRepository;

    @Override
    public void save(Student student) {
        studentRepository.save(student);
    }

    @Override
    public Student findById(Integer id) {
        return studentRepository.findOne(id);
    }

    @Override
    public List<Student> list() {
        return studentRepository.findAll();
    }

    @Override
    public void delete(Integer id) {
        studentRepository.delete(id);
    }


}

StudentProviderController.java

package com.cjh.microservicestudentprovider1001.controller;


import com.cjh.microservicecommon.entity.Student;
import com.cjh.microservicestudentprovider1001.service.StudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@RestController
@RequestMapping("/student")
public class StudentProviderController {
 
    @Autowired
    private StudentService studentService;
     
    @PostMapping(value="/save")
    public boolean save(Student student){
        try{
            studentService.save(student);  
            return true;
        }catch(Exception e){
            return false;
        }
    }
     
    @GetMapping(value="/list")
    public List<Student> list(){
        return studentService.list();
    }
     
    @GetMapping(value="/get/{id}")
    public Student get(@PathVariable("id") Integer id){
        return studentService.findById(id);
    }
     
    @GetMapping(value="/delete/{id}")
    public boolean delete(@PathVariable("id") Integer id){
        try{
            studentService.delete(id);
            return true;
        }catch(Exception e){
            return false;
        }
    }
}

建立消費者模塊：microservice-student-consumer-80

服務消費者主要是經過restful api來調用提供者的接口，固不須要不須要操做數據庫，相關配置以下

pom.xml配置

<?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>com.cjh</groupId>
        <artifactId>springcloud</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <artifactId>microservice-student-consumer-80</artifactId>


    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>com.javaxl</groupId>
            <artifactId>microservice-common</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
        </dependency>
        <!--  修改後當即生效，熱部署  -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>springloaded</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
        <dependency>
            <groupId>com.cjh</groupId>
            <artifactId>microservice-common</artifactId>
            <version>1.0-SNAPSHOT</version>
            <scope>compile</scope>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>



</project>

application.yml

server:
  port: 80
  context-path: /

MicroserviceStudentConsumer80Application.java

package com.cjh.microservicestudentconsumer80;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration;

@SpringBootApplication(exclude={DataSourceAutoConfiguration.class, HibernateJpaAutoConfiguration.class})
public class MicroserviceStudentConsumer80Application {

    public static void main(String[] args) {
        SpringApplication.run(MicroserviceStudentConsumer80Application.class, args);
    }

}

SpringCloudConfig.java

package com.cjh.microservicestudentconsumer80.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;

@Configuration
public class SpringCloudConfig {
 
    @Bean
    public RestTemplate getRestTemplate(){
        return new RestTemplate();
    }
}

StudentConsumerController.java

package com.cjh.microservicestudentconsumer80.controller;


import com.cjh.microservicecommon.entity.Student;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.client.RestTemplate;

import java.util.List;

@RestController
@RequestMapping("/student")
public class StudentConsumerController {

    private final static String SERVER_IP_PORT = "http://localhost:1001";

    @Autowired
    private RestTemplate restTemplate;

    @PostMapping(value="/save")
    private boolean save(Student student){
        return restTemplate.postForObject(SERVER_IP_PORT+"/student/save", student, Boolean.class);
    }

    @GetMapping(value="/list")
    public List<Student> list(){
        return restTemplate.getForObject(SERVER_IP_PORT+"/student/list", List.class);
    }

    @GetMapping(value="/get/{id}")
    public Student get(@PathVariable("id") Integer id){
        return restTemplate.getForObject(SERVER_IP_PORT+"/student/get/"+id, Student.class);
    }

    @GetMapping(value="/delete/{id}")
    public boolean delete(@PathVariable("id") Integer id){
        try{
            restTemplate.getForObject(SERVER_IP_PORT+"/student/delete/"+id, Boolean.class);
            return true;
        }catch(Exception e){
            return false;
        }
    }
}

成功結果圖以下:

http://localhost:1001/student/list 服務者訪問

http://localhost/student/list 消費者訪問

初識eureka

Eureka簡介：

Eureka是Netflix開發的服務發現框架，自己是一個基於REST的服務，主要用於定位運行在AWS域中的中間層服務，以達到負載均衡和中間層服務故障轉移的目的。SpringCloud將它集成在其子項目spring-cloud-netflix中，以實現SpringCloud的服務發現功能。

Eureka包含兩個組件：Eureka Server和Eureka Client。

Eureka Server提供服務註冊服務，各個節點啓動後，會在Eureka Server中進行註冊，這樣EurekaServer中的服務註冊表中將會存儲全部可用服務節點的信息，服務節點的信息能夠在界面中直觀的看到。

Eureka Client是一個java客戶端，用於簡化與Eureka Server的交互，客戶端同時也就別一個內置的、使用輪詢(round-robin)負載算法的負載均衡器。

在應用啓動後，將會向Eureka Server發送心跳,默認週期爲30秒，若是Eureka Server在多個心跳週期內沒有接收到某個節點的心跳，Eureka Server將會從服務註冊表中把這個服務節點移除(默認90秒)。

Eureka Server之間經過複製的方式完成數據的同步，Eureka還提供了客戶端緩存機制，即便全部的Eureka Server都掛掉，客戶端依然能夠利用緩存中的信息消費其餘服務的API。綜上，Eureka經過心跳檢查、客戶端緩存等機制，確保了系統的高可用性、靈活性和可伸縮性。

相似zookeeper，Eureka也是一個服務註冊和發現組件，是SpringCloud的一個優秀子項目，不過比較坑的是，Eureka2版本已經中止更新了。可是Eureka1版本仍是很穩定，功能足夠用，因此仍是有必要學習下。

可是這裏有幾個經常使用的服務註冊與發現組件比對；

Eureka的使用

前面說過eureka是c/s模式的 server服務端就是服務註冊中心，其餘的都是client客戶端，服務端用來管理全部服務，客戶端經過註冊中心，來調用具體的服務；

咱們先來搭建下服務端，也就是服務註冊中心；

新建 module microservice-eureka-server-2001；

在pom文件中加入eureka-server依賴；

在yml文件中添加Eureka服務端相關信息；

在啓動類中添加@EnableEurekaServer註解；

pom依賴

<?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>com.cjh</groupId>
        <artifactId>springcloud</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <artifactId>microservice-eureka-server-2001</artifactId>


    <properties>
        <java.version>1.8</java.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>
        <!--  修改後當即生效，熱部署  -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>springloaded</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>



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

application.yml

server:
  port: 2001
  context-path: /
eureka:
  instance:
    hostname: localhost #eureka註冊中心實例名稱
  client:
    register-with-eureka: false     #false 因爲該應用爲註冊中心，因此設置爲false,表明不向註冊中心註冊本身。
    fetch-registry: false     #false 因爲註冊中心的職責就是維護服務實例，它並不須要去檢索服務，因此也設置爲false
    service-url:
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/       #設置與Eureka註冊中心交互的地址，查詢服務和註冊服務用到

MicroserviceEurekaServer2001Application.java

package com.cjh.microserviceeurekaserver2001;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@EnableEurekaServer
@SpringBootApplication
public class MicroserviceEurekaServer2001Application {

    public static void main(String[] args) {
        SpringApplication.run(MicroserviceEurekaServer2001Application.class, args);
    }

}

測試鏈接

http://localhost:2001/

搭建成功截圖以下

向Eureka中註冊服務提供者

這裏咱們在原來的服務提供者項目 microservice-student-provider-1001 上面直接修改

首先pom.xml修改，加上eureka客戶端依賴：

<!--添加註冊中心Eureka相關配置-->
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-eureka</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-config</artifactId>
</dependency>

而後application.yml上加上配置:

eureka:
  instance:
    hostname: localhost  #eureka客戶端主機實例名稱
    appname: microservice-student  #客戶端服務名
    instance-id: microservice-student:1001 #客戶端實例名稱
    prefer-ip-address: true #顯示IP
  client:
    service-url:
      defaultZone: http://localhost:2001/eureka   #把服務註冊到eureka註冊中心

在啓動類加@EnableEurekaServer註解：

package com.cjh.microservicestudentprovider1001;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@EntityScan("com.cjh.*.*")
@EnableEurekaClient
@SpringBootApplication
public class MicroserviceStudentProvider1001Application {

    public static void main(String[] args) {
        SpringApplication.run(MicroserviceStudentProvider1001Application.class, args);
    }

}

而後咱們測試下，先啓動服務註冊中心microservice-student-provider-1001 Application，再啓動這個服務提供者MicroserviceEurekaServer2001Application；

而後運行：http://localhost:2001/

服務提供者成功註冊截圖以下

點擊實例狀態結果以下

解決方案以下

一、首先在服務提供者項目microservice-student-provider-1001 pom.xml里加入actuator監控依賴：

<!-- actuator監控引入 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>

二、最後服務提供者項目application.yml加上info配置：

info:
  groupId: com.javaxl.testSpringcloud
  artifactId: microservice-student-provider-1001
  version: 1.0-SNAPSHOT
  userName: http://javaxl.com
  phone: 123456

結果圖

每日一句

每一个你不满意的现在，都有一个你没有努力的曾经。