springboot集成 etcd，请给出完整的示例代码

好的，以下是一个简单的示例代码，展示了如何使用Spring Boot集成ETCD：

首先需要引入以下依赖：

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-etcd</artifactId>
    <version>3.0.1</version>
</dependency>

然后在application.yml中添加ETCD的配置：

spring:
  cloud:
    etcd:
      endpoints: http://localhost:2379

接着，可以使用EtcdKeyValueRepository将数据存储到ETCD中：

import org.springframework.cloud.etcd.config.EtcdKeyValueRepository;
import org.springframework.stereotype.Service;

@Service
public class EtcdService {

    private final EtcdKeyValueRepository etcdKeyValueRepository;

    public EtcdService(EtcdKeyValueRepository etcdKeyValueRepository) {
        this.etcdKeyValueRepository = etcdKeyValueRepository;
    }

    public void save(String key, String value) {
        etcdKeyValueRepository.put(key, value);
    }

    public String get(String key) {
        return etcdKeyValueRepository.get(key);
    }

    public void delete(String key) {
        etcdKeyValueRepository.delete(key);
    }
}

最后，在Controller中可以调用EtcdService来操作ETCD：

import org.springframework.web.bind.annotation.*;

@RestController
@RequestMapping("/etcd")
public class EtcdController {

    private final EtcdService etcdService;

    public EtcdController(EtcdService etcdService) {
        this.etcdService = etcdService;
    }

    @PostMapping("/{key}/{value}")
    public void save(@PathVariable String key, @PathVariable String value) {
        etcdService.save(key, value);
    }

    @GetMapping("/{key}")
    public String get(@PathVariable String key) {
        return etcdService.get(key);
    }

    @DeleteMapping("/{key}")
    public void delete(@PathVariable String key) {
        etcdService.delete(key);
    }

}

以上就是一个简单的Spring Boot集成ETCD的示例代码。