Spring Boot应用程序集成etcd

以下是一个Spring Boot应用程序，集成etcd实现键值存储和查询的示例。我们将使用etcd提供的Java客户端jetcd来与etcd进行交互。

docker compose 安装 etcd

使用docker compose 安装并启动 etcd：

etcd-compose.yml 文件内容：

version: '3.5'

services:
  etcd:
    container_name: milvus-etcd
    image: quay.io/coreos/etcd:v3.5.5
    environment:
      - ETCD_AUTO_COMPACTION_MODE=revision
      - ETCD_AUTO_COMPACTION_RETENTION=1000
      - ETCD_QUOTA_BACKEND_BYTES=4294967296
      - ETCD_SNAPSHOT_COUNT=50000
    ports:
      - "2379:2379"
    volumes:
      - ${
   
   DOCKER_VOLUME_DIRECTORY:-.}/volumes/etcd:/etcd
    command: etcd -advertise-client-urls=http://127.0.0.1:2379 -listen-client-urls http://0.0.0.0:2379 --data-dir /etcd
    healthcheck:
      test: ["CMD", "etcdctl", "endpoint", "health"]
      interval: 30s
      timeout: 20s
      retries: 3

启动容器：

docker compose -f etcd-compose.yml up -d

创建Spring Boot项目

首先，确保你在项目的pom.xml文件中添加了以下依赖：

    <dependencies>
        <!-- Spring Boot Starter Web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- Jetcd Java Client for etcd -->
        <!-- https://mvnrepository.com/artifact/io.etcd/jetcd-core -->
        <dependency>
            <groupId>io.etcd</groupId>
            <artifactId>jetcd-core</artifactId>
            <version>0.5.11</version>
        </dependency>

        <!-- Lombok (可选) -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok