Eureka 客户端配置

结构

如图所示，eureka 模块就是 eureka 服务端，另外 2 个模块都属于 eureka 客户端，无论是服务提供方还是服务发现方。它们的配置也是相同，不同的是使用方式。

依赖配置

<?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.xiangxue.jack</groupId>
    <artifactId>micro-order</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>
    <name>micro-order</name>
    <!-- FIXME change it to the project's website -->
    <url>http://www.example.com</url>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
        <spring-cloud.version>Hoxton.SR1</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

		<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </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>
</project>

bootstrap.properties 配置

spring.application.name=micro-order
server.port=8084

eureka.client.serviceUrl.defaultZone=http://localhost:8763/eureka/

#服务续约，心跳的时间间隔  单位 秒
eureka.instance.lease-renewal-interval-in-seconds=30
#如果从前一次发送心跳时间起，服务端90秒没接受到新的心跳，讲本剔除服务
eureka.instance.lease-expiration-duration-in-seconds=90
#间隔多久去拉取服务注册信息，默认为30秒 有可能还没剔除本问题服务，发现方请求错误
eureka.client.registry-fetch-interval-seconds=30

#健康检测 可以配合配置类做粒度更细的健康检测，如数据库连接失败就把服务连接状态置down
eureka.client.healthcheck.enabled=true

SpringBoot 启动类配置

//开启eureka客户端功能
@EnableEurekaClient

其它相关配置

健康检测相关配置

依赖配置

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>

配置类

@Configuration
public class MicroWebHealthIndicator implements HealthIndicator {

    @Override
    public Health health() {
        //这个状态就是数据库是否连接OK，自己编写
        if(UserController.canVisitDb) {
            return new Health.Builder(Status.UP).build();
        } else {
            return new Health.Builder(Status.DOWN).build();
        }
    }
}

@RestController
@RequestMapping("/user")
public class UserController {

    public static boolean canVisitDb = true;
    /*
    * 这个接口只为了检测db连接是否ok
    * */
    @RequestMapping("/db/{can}")
    public void setDb(@PathVariable boolean can) {
        canVisitDb = can;
    }
}