Neo4j安装

1. 安装JDK11

• 官网下载：oracle官网
  页面拉到下边11部分，需要注册账户，嫌麻烦的可以搜下：跳过注册下载jkd
  点击安装，注意安装目录，后面配置环境变量要用（但是好像自动给配置 了，不用自己配置）

如果先安装了17版本的，从应用程序中点击卸载，然后再删除安装的文件

• 测试是否安装成功
  cmd命令行输入java -version

  

注意：安装最新的17时，报错了，如下：（还是需要安装11版本的）

```bash
WARNING! You are using an unsupported Java runtime.
* Please use Oracle(R) Java(TM) 11, OpenJDK(TM) 11 to run Neo4j.
* Please see https://neo4j.com/docs/ for Neo4j installation instructions.
Java HotSpot(TM) 64-Bit Server VM warning: Option UseBiasedLocking was deprecated in version 15.0 and will likely be removed in a future release.
2021-11-23 06:41:09.394+0000 INFO  Starting...
Exception in thread "main" java.lang.LinkageError: Cannot to link java.nio.DirectByteBuffer
        at org.neo4j.internal.unsafe.UnsafeUtil.(UnsafeUtil.java:124)
        at org.neo4j.memory.RuntimeInternals.guessHeaderSize(RuntimeInternals.java:158)
        at org.neo4j.memory.RuntimeInternals.(RuntimeInternals.java:53)
        at org.neo4j.memory.HeapEstimator.(HeapEstimator.java:103)
        at org.neo4j.internal.collector.RecentQueryBuffer.(RecentQueryBuffer.java:37)
        at org.neo4j.graphdb.factory.module.GlobalModule.(GlobalModule.java:211)
        at org.neo4j.graphdb.facade.DatabaseManagementServiceFactory.createGlobalModule(DatabaseManagementServiceFactory.java:259)
        at org.neo4j.graphdb.facade.DatabaseManagementServiceFactory.build(DatabaseManagementServiceFactory.java:126)
        at org.neo4j.server.CommunityBootstrapper.createNeo(CommunityBootstrapper.java:36)
        at org.neo4j.server.NeoBootstrapper.start(NeoBootstrapper.java:134)
        at org.neo4j.server.NeoBootstrapper.start(NeoBootstrapper.java:90)
        at org.neo4j.server.CommunityEntryPoint.main(CommunityEntryPoint.java:34)
Caused by: java.lang.IllegalAccessException: module java.base does not open java.nio to unnamed module @2f7298b
        at java.base/java.lang.invoke.MethodHandles.privateLookupIn(MethodHandles.java:259)
        at org.neo4j.internal.unsafe.UnsafeUtil.(UnsafeUtil.java:107)
        ... 11 more
2021-11-23 06:41:09.515+0000 INFO  Neo4j Server shutdown initiated by request
2021-11-23 06:41:09.516+0000 INFO  Stopped.
Unexpected process failure. See log for info.
Run with '--verbose' for a more detailed error message.
```

2. 安装Neo4j

• 下载：Neo4j官网
  选择社区版下载，目前没发现版本要求，下载的最新版4.3.7，下载好后进行解压，记住解压后的位置
  

• 配置环境变量
  在系统变量->path中新增，输入C:\Program Files\neo4j-community-4.3.7\bin

  

• 测试是否安装成功
  命令行输入neo4j.bat console，然后复制地址在浏览器中打开，第一次启动有默认用户名和密码：neo4j neo4j ，之后会提示修改密码，不要忘记密码

  
  安装过程中用到的安装包：
  链接：https://pan.baidu.com/s/1CeLz2DJEP-2prXliTFk_lQ
  提取码：s05u