SpringCloud从入门到精通教程（二）- 服务提供者

需求背景

服务提供者

Tips技术点

1. @EnableEurekaClient注解

表示这是一个Eureka客户端程序

配置application.yml中eureka属性值
- 比如填写Eureka注册中心地址等

代码演示

1. 项目目录结构

2. pom.xml依赖组件

<?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>
    <artifactId>microservice-provider-user</artifactId>
    <packaging>jar</packaging>
    <parent>
        <groupId>com.minbo.cloud</groupId>
        <artifactId>spring-cloud-microservice-study</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <dependencies>
        <!-- 添加Eureka的依赖 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</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-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zipkin</artifactId>
        </dependency>
    </dependencies>
</project>

3. application.yml配置文件

server:
   port: 8000
spring:
   application:
      name: microservice-provider-user # 项目名称尽量用小写
eureka:
   # 配置开启健康检查
   client:
      healthcheck:
         enabled: true
      serviceUrl:
         defaultZone: http://localhost:8761/eureka/ # 指定注册中心的地址
   instance:
      # IP地址优先
      preferIpAddress: true
      # 按需配置续约更新时间和到期时间
      lease-expiration-duration-in-seconds: 30
      lease-renewal-interval-in-seconds: 10

注：spring.application.name是注册服务名，非常重要。服务消费者是通过此名称调用该服务提供者

4. 接口类（测试提供的方法）

package com.minbo.cloud.study.controller;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class HiController {
    @Value("${server.port}")
    String port;
    // 提供的方法
    @RequestMapping("/hi")
    public String hi(@RequestParam(value = "name", defaultValue = "minbo") String name) {
        String result = "hi " + name + " , i am from port:" + port;
        System.out.println(result);
        return result;
    }
}

5. 启动类

添加@EnableEurekaClient注解

package com.minbo.cloud.study;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
@SpringBootApplication
@EnableEurekaClient
public class UserApplication {
    public static void main(String[] args) {
        SpringApplication.run(UserApplication.class, args);
    }
}