以1.21.11为例

1.下载1.21.11服务端
https://piston-data.mojang.com/v1/objects/64bb6d763bed0a9f1d632ec347938594144943ed/server.jar

2.下载JAVA21
Java 8, 11, 17, 21, 25 Download for Linux, Windows and macOS

3.设置启动命令
java -jar *.jar

4.设置服务器端口
在server.properties文件里
server-port=
后跟服务商给你的端口

5.启动服务器
java -jar Vanilla-release-1.21.11.jar
Starting net.minecraft.server.Main
[18:00:19] [ServerMain/INFO]: Environment: Environment[sessionHost=https://sessionserver.mojang.com, servicesHost=https://api.minecraftservices.com, profilesHost=https://api.mojang.com, name=PROD]
[18:00:21] [ServerMain/INFO]: Loaded 1470 recipes
[18:00:21] [ServerMain/INFO]: Loaded 1584 advancements
[18:00:21] [Server thread/INFO]: Starting minecraft server version 1.21.11
[18:00:21] [Server thread/INFO]: Loading properties
[18:00:21] [Server thread/INFO]: Default game type: SURVIVAL
[18:00:21] [Server thread/INFO]: Generating keypair
[18:00:21] [Server thread/INFO]: Starting Minecraft server on 0.0.0.0:30017
[18:00:21] [Server thread/INFO]: Preparing level "world"
[18:00:22] [Server thread/INFO]: Loading 0 persistent chunks…
[18:00:22] [Server thread/INFO]: Preparing spawn area: 100%
[18:00:22] [Server thread/INFO]: Time elapsed: 12 ms

6.连接服务器
在mc客户端输入服务器ip，连接