tar zxvf etcd-v3.5.4-linux-amd64.tar.gz;
cd etcd-v3.5.4-linux-amd64;
cp etcd etcdctl /usr/local/bin/;

/usr/local/bin/etcd --version

/usr/local/bin/etcd  --listen-client-urls 'http://0.0.0.0:2379' --advertise-client-urls 'http://0.0.0.0:2379'

# /usr/local/bin/etcdctl put /dir1 aaa
OK
# /usr/local/bin/etcdctl get /dir1
/dir1
aaa

<dependency>
    <groupId>io.etcd</groupId>
    <artifactId>jetcd-core</artifactId>
    <version>0.3.0</version>
</dependency>

import io.etcd.jetcd.ByteSequence;
import io.etcd.jetcd.Client;
import io.etcd.jetcd.KV;
import io.etcd.jetcd.kv.GetResponse;
import io.etcd.jetcd.kv.PutResponse;
import org.junit.jupiter.api.*;

import java.nio.charset.StandardCharsets;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;

import static junit.framework.TestCase.assertNotNull;

//這個注解配合函數(shù)的Order注解,決定測試用例函數(shù)的執(zhí)行順序
@TestMethodOrder(MethodOrderer.OrderAnnotation.class)
public class EtcdTest {
  private static Client etcdClient;

  @BeforeAll
  static void  init(){
    etcdClient = Client.builder()
             //這里的etcd服務(wù)列表可以寫多個,用逗號分隔
            .endpoints("http://192.168.161.3:2379".split(","))
            .build();
  }

  @Test
  @Order(1)
  @DisplayName("etcd寫配置操作")
  void putKV() throws ExecutionException, InterruptedException {
    KV kv = etcdClient.getKVClient();
    ByteSequence key = ByteSequence.from("key-str", StandardCharsets.UTF_8);
    ByteSequence value = ByteSequence.from("value-str", StandardCharsets.UTF_8);
    //put key-value配置信息
    CompletableFuture<PutResponse> putRsp = kv.put(key,value);
    assertNotNull(putRsp.get().getHeader());
  }


  @Test
  @Order(2)
  @DisplayName("etcd讀配置操作")
  void getKV() throws ExecutionException, InterruptedException {
    KV kv = etcdClient.getKVClient();
    ByteSequence key = ByteSequence.from("key-str", StandardCharsets.UTF_8);
    //通過key獲取值
    CompletableFuture<GetResponse> getRsp = kv.get(key);
    String getBackValue = getRsp.get().getKvs().get(0).getValue().toString(StandardCharsets.UTF_8);
    System.out.println("從etcd通過key獲取value值為：" + getBackValue);
  }


  @Test
  @Order(3)
  @DisplayName("刪除配置操作")
  void deleteKV() {
    KV kv = etcdClient.getKVClient();
    ByteSequence key = ByteSequence.from("key-str", StandardCharsets.UTF_8);
    //通過key刪除數(shù)據(jù)
    kv.delete(key);
  }
}

//租約
Lease lease=etcdClient.getLeaseClient();
//監(jiān)聽
Watch watch =etcdClient.getWatchClient();
//選舉
Election election =etcdClient.getElectionClient();
//鎖
Lock lock=etcdClient.getLockClient();