sspringboot项目集成Eureka框架(微服务)

集成Eureka框架

依赖版本冲突问题

springboot与spring-cloud版本是有对应版本关系的

Finchley.BUILD-SNAPSHOT: "Spring Boot >=2.0.999.BUILD-SNAPSHOT and <2.1.0.M3"
Finchley.M2: "Spring Boot >=2.0.0.M3 and <2.0.0.M5"
Finchley.M3: "Spring Boot >=2.0.0.M5 and <=2.0.0.M5"
Finchley.M4: "Spring Boot >=2.0.0.M6 and <=2.0.0.M6"
Finchley.M5: "Spring Boot >=2.0.0.M7 and <=2.0.0.M7"
Finchley.M6: "Spring Boot >=2.0.0.RC1 and <=2.0.0.RC1"
Finchley.M7: "Spring Boot >=2.0.0.RC2 and <=2.0.0.RC2"
Finchley.M9: "Spring Boot >=2.0.0.RELEASE and <=2.0.0.RELEASE"
Finchley.RC1: "Spring Boot >=2.0.1.RELEASE and <2.0.2.RELEASE"
Finchley.RC2: "Spring Boot >=2.0.2.RELEASE and <2.0.3.RELEASE"
Finchley.SR4: "Spring Boot >=2.0.3.RELEASE and <2.0.999.BUILD-SNAPSHOT"
Greenwich.BUILD-SNAPSHOT: "Spring Boot >=2.1.9.BUILD-SNAPSHOT and <2.2.0.M4"
Greenwich.M1: "Spring Boot >=2.1.0.M3 and <2.1.0.RELEASE"
Greenwich.SR2: "Spring Boot >=2.1.0.RELEASE and <2.1.9.BUILD-SNAPSHOT"
Hoxton.BUILD-SNAPSHOT: "Spring Boot >=2.2.0.BUILD-SNAPSHOT"
Hoxton.M2: "Spring Boot >=2.2.0.M4 and <=2.2.0.M5"

 <?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>2.0.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Finchley.M9</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
            <version>2.0.0.M8</version>
        </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>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-autoconfigure</artifactId>
            <version>2.0.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-api</artifactId>
            <scope>test</scope>
        </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>

</project>

1.集成Eureka-server端注册服务器

1. 在启动类上加注解:@EnableEurekaServer
2. 配置application.properties:

server.port=8761   //端口号自定义

eureka.instance.hostname=localhost          //实例的主机名称
eureka.client.register-with-eureka=false    //禁用客户端
eureka.client.fetch-registry=false
eureka.client.service-url.defaultZone:http://${eureka.instance.hostname}:${server.port}/eureka/   
//定义服务的url

启动项目看到下面内容,证明成功。

2.集成Eureka-Client端可以将子项目注册进去

1. 修改依赖

       <dependency>
           <groupId>org.springframework.cloud</groupId>
           <artifactId>spring-cloud-starter-netflix-eureka-Client</artifactId>
           <version>2.0.0.M8</version>
       </dependency>

2. 在启动类上加注解:@EnableDiscoveryClient
3. 配置applacation.properties:

spring.application.name = xxxx  //项目名称,以后注册到服务器上的名称

eureka.client.serviceUrl.defaultZone:http://localhost:8761/eureka/   
//注册服务器的位置

看到如下application中有刚才注册的名称就算成功注册。

可以将其余的子项目都通过第二个Client注册到服务器中,每个子项目可以启动两个实例(不同的端口号),这样好处就是一个实例挂掉还有第二个实例可以顶上去。