Springcloud简介

简介

Spring Cloud是一系列框架的有序集合。它利用Spring Boot的开发便利性巧妙地简化了分布式系统基础设施的开发，如服务发现注册、配置中心、消息总线、负载均衡、断路器、数据监控等，都可以用Spring Boot的开发风格做到一键启动和部署。Spring Cloud并没有重复制造轮子，它只是将目前各家公司开发的比较成熟、经得起实际考验的服务框架组合起来，通过Spring Boot风格进行再封装屏蔽掉了复杂的配置和实现原理，最终给开发者留出了一套简单易懂、易部署和易维护的分布式系统开发工具包。

配套参考资料：

https://projects.spring.io/spring-cloud/ springcloud项目官方主页

https://springcloud.cc/ springcloud中文网有很详细的翻译文档

http://springcloud.cn/ springcloud中文论坛

Springcloud版本pom文件生成可借助网站：https://start.spring.io/

原有的单体项目最终会被演化成下面

这样的架构解决了单体项目几点问题：

1、zuul网关解决了服务调用安全性的问题

2、服务注册与发现（注册中心）eureka解决了各层服务耦合问题，它是微服务架构的核心，有它才能将单体项目拆解成微服务架构

3、Eureka集群解决了微服务中，注册中心宕机产生的问题

4、Ribbon负载均衡及Feign消费者调用服务，减小了各微服务服务器的访问压力，默认采用了经典的轮询机制

5、熔断器Hystrix解决了，微服务架构中服务器雪崩现象

6、服务监控（单机Dashboard与集群turbine），方便运维人员查看微服务架构项目运行时，各个服务器的运行状态

7、服务配置中心（springcloud config），用来通过github统一管理各个微服务的配置文件（yml文件）

微服务架构注意点：

1、springboot、springcloud版本在父工程定义；

2、由于通用模块无需操作数据库，springboot启动默认会读取数据库，所以得添加以下注解 @SpringBootApplication(exclude={DataSourceAutoConfiguration.class, HibernateJpaAutoConfiguration.class})；

3、分布式jpa需要在启动类上添加@EntityScan("com.javaxl.*.*")；

4、消费者需要添加配置类获取org.springframework.web.client.RestTemplate，springcloud底层是通过RestTemplate来调用提供者的服务的。

创建父工程microservice

父工程是一个maven项目，一般创建方式即可，父工程的主要用途是锁定pom依赖包版本。由于springcloud2X停止更

配置pom.xml.

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 
 3 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 5   <modelVersion>4.0.0</modelVersion>
 6 
 7   <groupId>com.javaqi</groupId>
 8   <artifactId>qimicroservice</artifactId>
 9   <version>1.0-SNAPSHOT</version>
10   <packaging>war</packaging>
11 
12 
13   <properties>
14   <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
15   <maven.compiler.source>1.8</maven.compiler.source>
16   <maven.compiler.target>1.8</maven.compiler.target>
17   <druid.version>1.1.10</druid.version>
18 </properties>
19 <!--锁定pom依赖jar包，但不实际引入-->
20   <dependencyManagement>
21     <dependencies>
22       <dependency>
23         <groupId>org.springframework.cloud</groupId>
24         <artifactId>spring-cloud-dependencies</artifactId>
25         <version>Edgware.SR4</version>
26         <type>pom</type>
27         <scope>import</scope>
28       </dependency>
29       <dependency>
30         <groupId>org.springframework.boot</groupId>
31         <artifactId>spring-boot-dependencies</artifactId>
32         <version>1.5.13.RELEASE</version>
33         <type>pom</type>
34         <scope>import</scope>
35       </dependency>
36       <!--  连接池  -->
37       <dependency>
38         <groupId>com.alibaba</groupId>
39         <artifactId>druid-spring-boot-starter</artifactId>
40         <version>${druid.version}</version>
41       </dependency>
42     </dependencies>
43   </dependencyManagement>
44 
45 </project>

创建通用模块microservice-common

通用模块主要存放实体类、工具包等被整个微服务框架所使用的代码。创建一个简单的springboot模块即可。

配置pom.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 3          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
 4     <modelVersion>4.0.0</modelVersion>
 5     <parent>
 6         <groupId>com.javaqi</groupId>
 7         <artifactId>qimicroservice</artifactId>
 8         <version>1.0-SNAPSHOT</version>
 9     </parent>
10     <artifactId>microservice-common</artifactId>
11 
12 
13     <properties>
14         <java.version>1.8</java.version>
15     </properties>
16 
17     <dependencies>
18         <dependency>
19             <groupId>org.springframework.boot</groupId>
20             <artifactId>spring-boot-starter-web</artifactId>
21         </dependency>
22 
23         <dependency>
24             <groupId>org.springframework.boot</groupId>
25             <artifactId>spring-boot-starter-test</artifactId>
26             <scope>test</scope>
27         </dependency>
28 
29 
30         <dependency>
31             <groupId>org.springframework.boot</groupId>
32             <artifactId>spring-boot-starter-data-jpa</artifactId>
33         </dependency>
34 
35         <dependency>
36             <groupId>mysql</groupId>
37             <artifactId>mysql-connector-java</artifactId>
38         </dependency>
39     </dependencies>
40 
41     <build>
42         <plugins>
43             <plugin>
44                 <groupId>org.springframework.boot</groupId>
45                 <artifactId>spring-boot-maven-plugin</artifactId>
46             </plugin>
47         </plugins>
48     </build>
49 
50 </project>

MicroserviceCommonApplication

 1 package com.javaqi.microservicecommon;
 2 
 3         import org.springframework.boot.SpringApplication;
 4         import org.springframework.boot.autoconfigure.SpringBootApplication;
 5         import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
 6         import org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration;
 7 
 8 @SpringBootApplication(exclude={DataSourceAutoConfiguration.class, HibernateJpaAutoConfiguration.class})
 9 public class MicroserviceCommonApplication {
10 
11     public static void main(String[] args) {
12         SpringApplication.run(MicroserviceCommonApplication.class, args);
13     }
14 
15 }

Student

 1 package com.javaqi.microservicecommon.entity;
 2 
 3 import javax.persistence.*;
 4 import java.io.Serializable;
 5 
 6 @Entity
 7 @Table(name="t_springcloud_student")
 8 public class Student implements Serializable {
 9  
10     private static final long serialVersionUID = 1L;
11  
12     @Id
13     @GeneratedValue
14     private Integer id;
15      
16     @Column(length=50)
17     private String name;
18      
19     @Column(length=50)
20     private String grade;
21      
22     public Integer getId() {
23         return id;
24     }
25     public void setId(Integer id) {
26         this.id = id;
27     }
28     public String getName() {
29         return name;
30     }
31     public void setName(String name) {
32         this.name = name;
33     }
34     public String getGrade() {
35         return grade;
36     }
37     public void setGrade(String grade) {
38         this.grade = grade;
39     }
40      
41      
42      
43 }

创建服务提供者microservice-student-provider-1001

创建一个简单的springboot模块，这里服务提供者需要操作数据库并且被浏览器所访问，

配置pom

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 3          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
 4     <modelVersion>4.0.0</modelVersion>
 5     <parent>
 6         <groupId>com.javaqi</groupId>
 7         <artifactId>qimicroservice</artifactId>
 8         <version>1.0-SNAPSHOT</version>
 9     </parent>
10     <artifactId>microservice-student-provider-1001</artifactId>
11 
12     <properties>
13         <java.version>1.8</java.version>
14     </properties>
15 
16     <dependencies>
17         <dependency>
18             <groupId>com.javaqi</groupId>
19             <artifactId>microservice-common</artifactId>
20         </dependency>
21         <dependency>
22             <groupId>org.springframework.boot</groupId>
23             <artifactId>spring-boot-starter-web</artifactId>
24         </dependency>
25         <dependency>
26             <groupId>org.springframework.boot</groupId>
27             <artifactId>spring-boot-starter-test</artifactId>
28             <scope>test</scope>
29         </dependency>
30         <dependency>
31             <groupId>org.springframework.boot</groupId>
32             <artifactId>spring-boot-starter-data-jpa</artifactId>
33         </dependency>
34         <dependency>
35             <groupId>mysql</groupId>
36             <artifactId>mysql-connector-java</artifactId>
37         </dependency>
38         <dependency>
39             <groupId>org.springframework.boot</groupId>
40             <artifactId>spring-boot-starter-tomcat</artifactId>
41         </dependency>
42         <dependency>
43             <groupId>com.alibaba</groupId>
44             <artifactId>druid-spring-boot-starter</artifactId>
45         </dependency>
46         <!--  修改后立即生效，热部署  -->
47         <dependency>
48             <groupId>org.springframework</groupId>
49             <artifactId>springloaded</artifactId>
50         </dependency>
51         <dependency>
52             <groupId>org.springframework.boot</groupId>
53             <artifactId>spring-boot-devtools</artifactId>
54         </dependency>
55 
56         <!--添加注册中心Eureka相关配置-->
57         <dependency>
58             <groupId>org.springframework.cloud</groupId>
59             <artifactId>spring-cloud-starter-eureka</artifactId>
60         </dependency>
61         <dependency>
62             <groupId>org.springframework.cloud</groupId>
63             <artifactId>spring-cloud-starter-config</artifactId>
64         </dependency>
65         <dependency>
66             <groupId>com.javaqi</groupId>
67             <artifactId>microservice-common</artifactId>
68             <version>1.0-SNAPSHOT</version>
69             <scope>compile</scope>
70         </dependency>
71 
72         <!-- actuator监控引入 -->
73         <dependency>
74             <groupId>org.springframework.boot</groupId>
75             <artifactId>spring-boot-starter-actuator</artifactId>
76         </dependency>
77     </dependencies>
78 
79     <build>
80         <plugins>
81             <plugin>
82                 <groupId>org.springframework.boot</groupId>
83                 <artifactId>spring-boot-maven-plugin</artifactId>
84             </plugin>
85         </plugins>
86     </build>
87 
88 </project>

　　配置application.yml

 1 server:
 2   port: 1001
 3   context-path: /
 4 spring:
 5   datasource:
 6     type: com.alibaba.druid.pool.DruidDataSource
 7     driver-class-name: com.mysql.jdbc.Driver
 8     url: jdbc:mysql://localhost:3306/xufanqi?useUnicode=true&characterEncoding=utf8
 9     username: root
10     password: 123
11   jpa:
12     hibernate:
13       ddl-auto: update
14     show-sql: true
15

MicroserviceStudentProvider1001Application

 1 package com.javaqi.microservicestudentprovider1001;
 2 
 3 import org.springframework.boot.SpringApplication;
 4 import org.springframework.boot.autoconfigure.SpringBootApplication;
 5 import org.springframework.boot.autoconfigure.domain.EntityScan;
 6 import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
 7 
 8 @EntityScan("com.javaqi.*.*")
 9 @EnableEurekaClient
10 @SpringBootApplication
11 public class MicroserviceStudentProvider1001Application {
12 
13     public static void main(String[] args) {
14         SpringApplication.run(MicroserviceStudentProvider1001Application.class, args);
15     }
16 
17 }

Repository层

1 package com.javaqi.microservicestudentprovider1001.repository;
2 
3 import com.javaqi.microservicecommon.entity.Student;
4 import org.springframework.data.jpa.repository.JpaRepository;
5 import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
6 
7 public interface StudentRepository extends JpaRepository<Student, Integer>, JpaSpecificationExecutor<Student> {
8  
9 }

Controller层

package com.javaqi.microservicestudentprovider1001.controller;

import com.javaqi.microservicecommon.entity.Student;
import com.javaqi.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;
        }
    }
}

Service层

 1 package com.javaqi.microservicestudentprovider1001.service;
 2 
 3 import com.javaqi.microservicecommon.entity.Student;
 4 
 5 import java.util.List;
 6 
 7 public interface StudentService {
 8  
 9     public void save(Student student);
10      
11     public Student findById(Integer id);
12      
13     public List<Student> list();
14      
15     public void delete(Integer id);
16      
17      
18 }

StudentServiceImpl

 1 package com.javaqi.microservicestudentprovider1001.service.impl;
 2 
 3 import com.javaqi.microservicecommon.entity.Student;
 4 import com.javaqi.microservicestudentprovider1001.repository.StudentRepository;
 5 import com.javaqi.microservicestudentprovider1001.service.StudentService;
 6 import org.springframework.beans.factory.annotation.Autowired;
 7 import org.springframework.stereotype.Service;
 8 
 9 import java.util.List;
10 
11 @Service
12 public class StudentServiceImpl implements StudentService {
13 
14     @Autowired
15     private StudentRepository studentRepository;
16 
17     @Override
18     public void save(Student student) {
19         studentRepository.save(student);
20     }
21 
22     @Override
23     public Student findById(Integer id) {
24         return studentRepository.findOne(id);
25     }
26 
27     @Override
28     public List<Student> list() {
29         return studentRepository.findAll();
30     }
31 
32     @Override
33     public void delete(Integer id) {
34         studentRepository.delete(id);
35     }
36 
37 }

创建服务消费者microservice-student-consumer-80

服务消费者主要是通过restful api来调用提供者的接口，固不需要不需要操作数据库

配置pom

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 3          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
 4     <modelVersion>4.0.0</modelVersion>
 5     <parent>
 6         <groupId>com.javaqi</groupId>
 7         <artifactId>qimicroservice</artifactId>
 8         <version>1.0-SNAPSHOT</version>
 9     </parent>
10     <artifactId>microservice-student-consumer-80</artifactId>
11 
12     <properties>
13         <java.version>1.8</java.version>
14     </properties>
15     <dependencies>
16         <dependency>
17             <groupId>com.javaqi</groupId>
18             <artifactId>microservice-common</artifactId>
19         </dependency>
20         <dependency>
21             <groupId>org.springframework.boot</groupId>
22             <artifactId>spring-boot-starter-web</artifactId>
23         </dependency>
24         <dependency>
25             <groupId>org.springframework.boot</groupId>
26             <artifactId>spring-boot-starter-test</artifactId>
27             <scope>test</scope>
28         </dependency>
29         <dependency>
30             <groupId>org.springframework.boot</groupId>
31             <artifactId>spring-boot-starter-data-jpa</artifactId>
32         </dependency>
33         <dependency>
34             <groupId>mysql</groupId>
35             <artifactId>mysql-connector-java</artifactId>
36         </dependency>
37         <dependency>
38             <groupId>org.springframework.boot</groupId>
39             <artifactId>spring-boot-starter-tomcat</artifactId>
40         </dependency>
41         <!--  修改后立即生效，热部署  -->
42         <dependency>
43             <groupId>org.springframework</groupId>
44             <artifactId>springloaded</artifactId>
45         </dependency>
46         <dependency>
47             <groupId>org.springframework.boot</groupId>
48             <artifactId>spring-boot-devtools</artifactId>
49         </dependency>
50         <dependency>
51             <groupId>com.javaqi</groupId>
52             <artifactId>microservice-common</artifactId>
53             <version>1.0-SNAPSHOT</version>
54             <scope>compile</scope>
55         </dependency>
56     </dependencies>
57     <build>
58         <plugins>
59             <plugin>
60                 <groupId>org.springframework.boot</groupId>
61                 <artifactId>spring-boot-maven-plugin</artifactId>
62             </plugin>
63         </plugins>
64     </build>
65 
66 </project>

Config层

 1 package com.javaqi.microservicestudentconsumer80.config;
 2 
 3 import org.springframework.context.annotation.Bean;
 4 import org.springframework.context.annotation.Configuration;
 5 import org.springframework.web.client.RestTemplate;
 6 
 7 @Configuration
 8 public class SpringCloudConfig {
 9 
10     @Bean
11     public RestTemplate getRestTemplate(){
12         return new RestTemplate();
13     }
14 }

Controller层

StudentConsumerController

 1 package com.javaqi.microservicestudentconsumer80.controller;
 2 
 3 import com.javaqi.microservicecommon.entity.Student;
 4 import org.springframework.beans.factory.annotation.Autowired;
 5 import org.springframework.web.bind.annotation.*;
 6 import org.springframework.web.client.RestTemplate;
 7 
 8 import java.util.List;
 9 
10 @RestController
11 @RequestMapping("/student")
12 public class StudentConsumerController {
13 
14     private final static String SERVER_IP_PORT = "http://localhost:1001";
15  
16      @Autowired
17      private RestTemplate restTemplate;
18       
19      @PostMapping(value="/save")
20      private boolean save(Student student){
21          return restTemplate.postForObject(SERVER_IP_PORT+"/student/save", student, Boolean.class);
22      }
23       
24     @GetMapping(value="/list")
25     public List<Student> list(){
26         return restTemplate.getForObject(SERVER_IP_PORT+"/student/list", List.class);
27     }
28      
29     @GetMapping(value="/get/{id}")
30     public Student get(@PathVariable("id") Integer id){
31         return restTemplate.getForObject(SERVER_IP_PORT+"/student/get/"+id, Student.class);
32     }
33      
34     @GetMapping(value="/delete/{id}")
35     public boolean delete(@PathVariable("id") Integer id){
36         try{
37             restTemplate.getForObject(SERVER_IP_PORT+"/student/delete/"+id, Boolean.class);
38             return true;
39         }catch(Exception e){
40             return false;
41         }
42     }
43 }

application.yml

1 server:
2   port: 80
3   context-path: /

MicroserviceStudentConsumer80Application

 1 package com.javaqi.microservicestudentconsumer80;
 2 
 3 import org.springframework.boot.SpringApplication;
 4 import org.springframework.boot.autoconfigure.SpringBootApplication;
 5 import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
 6 import org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration;
 7 
 8 @SpringBootApplication(exclude={DataSourceAutoConfiguration.class, HibernateJpaAutoConfiguration.class})
 9 public class MicroserviceStudentConsumer80Application {
10 
11     public static void main(String[] args) {
12         SpringApplication.run(MicroserviceStudentConsumer80Application.class, args);
13     }
14 
15 }

浏览器访问

Eureka

简介：

Eureka是Netflix开发的服务发现框架，本身是一个基于REST的服务，主要用于定位运行在AWS域中的中间层服务，以达到负载均衡和中间层服务故障转移的目的。SpringCloud将它集成在其子项目spring-cloud-netflix中，以实现SpringCloud的服务发现功能。

Eureka包含两个组件：Eureka Server和Eureka Client。

Eureka Server提供服务注册服务，各个节点启动后，会在Eureka Server中进行注册，这样EurekaServer中的服务注册表中将会存储所有可用服务节点的信息，服务节点的信息可以在界面中直观的看到。

Eureka Client是一个java客户端，用于简化与Eureka Server的交互，客户端同时也就别一个内置的、使用轮询(round-robin)负载算法的负载均衡器。

在应用启动后，将会向Eureka Server发送心跳,默认周期为30秒，如果Eureka Server在多个心跳周期内没有接收到某个节点的心跳，Eureka Server将会从服务注册表中把这个服务节点移除(默认90秒)。

Eureka Server之间通过复制的方式完成数据的同步，Eureka还提供了客户端缓存机制，即使所有的Eureka Server都挂掉，客户端依然可以利用缓存中的信息消费其他服务的API。综上，Eureka通过心跳检查、客户端缓存等机制，确保了系统的高可用性、灵活性和可伸缩性。

类似zookeeper，Eureka也是一个服务注册和发现组件，是SpringCloud的一个优秀子项目，不过比较坑的是，Eureka2版本已经停止更新了。但是Eureka1版本还是很稳定，功能足够用，所以还是有必要学习下。

几个常用的服务注册与发现组件比对；

服务注册与发现原理：

Eureka的使用

前面说过eureka是c/s模式的 server服务端就是服务注册中心，其他的都是client客户端，服务端用来管理所有服务，客户端通过注册中心，来调用具体的服务；

我们先来搭建下服务端，也就是服务注册中心；

新建 module microservice-eureka-server-2001；

在pom文件中加入eureka-server依赖；

在yml文件中添加Eureka服务端相关信息；

在启动类中添加@EnableEurekaServer注解；

配置pom

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 3          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
 4     <modelVersion>4.0.0</modelVersion>
 5     <parent>
 6         <groupId>com.javaqi</groupId>
 7         <artifactId>qimicroservice</artifactId>
 8         <version>1.0-SNAPSHOT</version>
 9     </parent>
10     <artifactId>microservice-eureka-server-2001</artifactId>
11 
12     <properties>
13         <java.version>1.8</java.version>
14     </properties>
15 
16     <dependencies>
17         <dependency>
18             <groupId>org.springframework.cloud</groupId>
19             <artifactId>spring-cloud-starter-eureka-server</artifactId>
20         </dependency>
21 
22         <dependency>
23             <groupId>org.springframework.boot</groupId>
24             <artifactId>spring-boot-starter-test</artifactId>
25             <scope>test</scope>
26         </dependency>
27 
28         <!--  修改后立即生效，热部署  -->
29         <dependency>
30             <groupId>org.springframework</groupId>
31             <artifactId>springloaded</artifactId>
32         </dependency>
33 
34         <dependency>
35             <groupId>org.springframework.boot</groupId>
36             <artifactId>spring-boot-devtools</artifactId>
37         </dependency>
38     </dependencies>
39 
40     <build>
41         <plugins>
42             <plugin>
43                 <groupId>org.springframework.boot</groupId>
44                 <artifactId>spring-boot-maven-plugin</artifactId>
45             </plugin>
46         </plugins>
47     </build>
48 
49 </project>

配置application.yml

 1 server:
 2   port: 2001
 3   context-path: /
 4 eureka:
 5   instance:
 6     hostname: localhost #eurekau6CE8u518Cu4E2Du5FC3u5B9Eu4F8Bu540Du79F0
 7   client:
 8     register-with-eureka: false     #false u7531u4E8Eu8BE5u5E94u7528u4E3Au6CE8u518Cu4E2Du5FC3uFF0Cu6240u4EE5u8BBEu7F6Eu4E3Afalse,u4EE3u8868u4E0Du5411u6CE8u518Cu4E2Du5FC3u6CE8u518Cu81EAu5DF1u3002
 9     fetch-registry: false     #false u7531u4E8Eu6CE8u518Cu4E2Du5FC3u7684u804Cu8D23u5C31u662Fu7EF4u62A4u670Du52A1u5B9Eu4F8BuFF0Cu5B83u5E76u4E0Du9700u8981u53BBu68C0u7D22u670Du52A1uFF0Cu6240u4EE5u4E5Fu8BBEu7F6Eu4E3Afalse
10     service-url:
11       defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/       #u8BBEu7F6Eu4E0EEurekau6CE8u518Cu4E2Du5FC3u4EA4u4E92u7684u5730u5740uFF0Cu67E5u8BE2u670Du52A1u548Cu6CE8u518Cu670Du52A1u7528u5230

MicroserviceEurekaServer2001Application

 1 package com.javaqi.microserviceeurekaserver2001;
 2 
 3 import org.springframework.boot.SpringApplication;
 4 import org.springframework.boot.autoconfigure.SpringBootApplication;
 5 import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
 6 
 7 @EnableEurekaServer
 8 @SpringBootApplication
 9 public class MicroserviceEurekaServer2001Application {
10 
11     public static void main(String[] args) {
12         SpringApplication.run(MicroserviceEurekaServer2001Application.class, args);
13     }
14 
15 }

向Eureka中注册服务提供者

这里我们在原来的服务提供者项目 microservice-student-provider-1001 上面直接修改：

首先pom.xml修改，加上eureka客户端依赖：.

<!--添加注册中心Eureka相关配置-->
<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>

然后microservice-student-provider-1001的application.yml上加上配置：

1 eureka:
2   instance:
3     hostname: localhost  #eureka客户端主机实例名称
4     appname: microservice-student  #客户端服务名
5     instance-id: microservice-student:1001 #客户端实例名称
6     prefer-ip-address: true #显示IP
7   client:
8     service-url:
9       defaultZone: http://localhost:2001/eureka   #把服务注册到eureka注册中心

这里的defaultZone要和前面服务注册中心的暴露地址一致；

最后启动类加上一个注解 @EnableEurekaClient；

 1 package com.javaqi.microservicestudentprovider1001;
 2 
 3 import org.springframework.boot.SpringApplication;
 4 import org.springframework.boot.autoconfigure.SpringBootApplication;
 5 import org.springframework.boot.autoconfigure.domain.EntityScan;
 6 import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
 7 
 8 @EntityScan("com.javaqi.*.*")
 9 @EnableEurekaClient
10 @SpringBootApplication
11 public class MicroserviceStudentProvider1001Application {
12 
13     public static void main(String[] args) {
14         SpringApplication.run(MicroserviceStudentProvider1001Application.class, args);
15     }
16 
17 }

启动顺序：

启动服务注册中心，再启动这个服务提供者

结果

解决小红框点击出现Whitelabel Error Page问题

首先在服务提供者项目pom.xml里加入actuator监控依赖：

1 <!-- actuator监控引入 -->
2 <dependency>
3     <groupId>org.springframework.boot</groupId>
4     <artifactId>spring-boot-starter-actuator</artifactId>
5 </dependency>

2、最后服务提供者项目application.yml加上info配置：

1 info:
2   groupId: com.yuan.t226Springcloud
3   artifactId: microservice-student-provider-1001
4   version: 1.0-SNAPSHOT
5   userName: http://yuan.com
6   phone: 123456

结果如下