通过VMware虚拟环境，为你的Hadoop大数据环境做好准备，成为专业人士的首选！

分手后的思念是犯贱 2024-03-23 23:41 60阅读 0赞

#### 文章目录 ####

*  前言
 *  一 学习环境简介
 *  二 VMware准备Linuc虚拟机
 *   *  2.1 安装VMware虚拟机
     *  2.2 设置VMware网段
     *  2.3 下载Centos操作系统
     *  2.4 VMware安装Centos
     *  2.5 配置多台Linux虚拟机
 *  三 VMware虚拟机系统设置
 *   *  3.1 修改主机名、设置固定IP
     *  3.2 配置主机名映射
     *  3.3 配置SSH免密登录
     *   *  3.3.1 root用户操作步骤
         *  3.3.2 实际操作代码演示
         *  3.3.3 知识补充：ssh-keygen
         *  3.3.4 创建hadoop用户并配置免密登录
     *  3.4 JDK环境部署
     *  3.5 防火墙、SELinux
     *  3.6 修改时区并配置自动时间同步
     *  3.7 设置快照

## 前言 ##

*  本文学自黑马程序员2023版Hadoop课程，**环境使用VMware虚拟化软件、Centos系统**

![在这里插入图片描述][63aa582ed8ce409b9f2bcf82c90c146d.png]

## 一 学习环境简介 ##

Linux环境

*  学习大数据需要使用多台Linux服务器（本次学习使用3台）
 *  本地虚拟环境：基于VMware构建Linux虚拟机

## 二 VMware准备Linuc虚拟机 ##

### 2.1 安装VMware虚拟机 ###

*  参看[Linux学习之环境准备][Linux]

### 2.2 设置VMware网段 ###

*  在VMware的虚拟网络编辑器中，将VMnet8虚拟网卡的:
    
     *  网段设置为:`192.168.28.0`
     *  网关设置为:`192.168.28.2`  
        ![在这里插入图片描述][2af55a2e8c864e179153dabad65ab1ce.png]  
        ![在这里插入图片描述][fb27b83ccb974b17979bd08a4b7e0611.gif_pic_center]

### 2.3 下载Centos操作系统 ###

*  \[Centos7.6下载地址\] (https://vault.centos.org/7.6.1810/isos/x86\_64/)
 *  推荐下载方案：使用[Free Manager Download工具][Free Manager Download]，填入下载网址：`https://vault.centos.org/7.6.1810/isos/x86_64/CentOS-7-x86_64-DVD-1810.iso`进行下载

### 2.4 VMware安装Centos ###

![在这里插入图片描述][023f5bae5843417b8c93cbcc9f29ce4d.png]  
![在这里插入图片描述][8b4a9ad32e8b45d48eb4dcfee9acf440.png]  
![在这里插入图片描述][8a1bb62862364abcbb51ad7ed82a596e.png]  
![在这里插入图片描述][b63f9dfad3e84b0b8fe684946f59ee2a.png]  
![在这里插入图片描述][982c2d90bdf14ae0b79f331bacc5e4ca.png]  
![在这里插入图片描述][d9f1403f114f4af0ab01309ba287b09f.png]

*  点击完成后，即开启了CentOS系统的安装，耐心等待安装完成即可，后续都是自动化的
 *  然后等待Centos启动，使用设置的密码登录Linux系统即可

### 2.5 配置多台Linux虚拟机 ###

*  使用VMware提供的克隆功能，基于一台虚拟机去克隆创建多台虚拟机

1.  首先，在VMware中，创建一个文件夹，起名为**大数据集群**  
    ![在这里插入图片描述][ea780248258e41b0ac153d16cfb6547c.png]
2.  使用克隆功能进行Centos虚拟机克隆  
    ![在这里插入图片描述][2b94b8449f824a6e8c81a317003c95a7.png]  
    ![在这里插入图片描述][f6385d32b67b496db0d88180271017d3.png]  
    ![在这里插入图片描述][a7adf0fbd1764cbba0bb0225e44c8925.png]  
    ![在这里插入图片描述][0ad234cca6844c02ad7359afed27f2ed.png]  
    ![在这里插入图片描述][81d0fa1e9e094650a4d9882ddb0f1cf2.png]  
    ![在这里插入图片描述][282546822059422f8249332b9e9eb7f5.png]
3.  同样的操作克隆出:node2和node3
    
     *  对虚拟机的内存进行配置:
        
         *  node1配置为4G内存
         *  node2、node3配置为2G内存
         *  硬盘可以根据设置为20GB，土豪任意  
            ![在这里插入图片描述][cc373c978bb94115ac23575fd75d7538.png]

## 三 VMware虚拟机系统设置 ##

### 3.1 修改主机名、设置固定IP ###

*  开启node1虚拟机，修改主机名为node1，并修改固定ip为:`192.168.28.131`

1.  打开Linux终端执行如下命令
    
        # 修改主机名称
        hostnamectl set-hostname node1
        # 修改IP地址
        vim /etc/sysconfig/network-scripts/ifcfg-ens33
2.  打开`ifcfg-ens33`后，修改文件以下内容

# 1.修改第四行内容设置为static
    BOOTPROTO="static"
    # 2.在文件末尾添加以下内容
    IPADDR="192.168.28.131"
    NETMASK="255.255.255.0"
    GATEWAY="192.168.28.2"
    DNS1="192.168.28.2"

1.  同样的操作启动node2,node3
    
     *  修改node2主机名为node2，设置ip为`192.168.28.132`
     *  修改node2主机名为node3，设置ip为`192.168.88.133`

### 3.2 配置主机名映射 ###

1.  在Windows系统中修改`C:\Windows\System32\drivers\etc\hosts`文件，填入如下内容
    
        192.168.28.131 node1
        192.168.28.132 node2
        192.168.28.133 node3
2.  在3台Linux的/etc/hosts文件中，填入如下内容（3台都要添加)
    
        192.168.28.131 node1
        192.168.28.132 node2
        192.168.28.133 node3

### 3.3 配置SSH免密登录 ###

#### 3.3.1 root用户操作步骤 ####

*  后续安装的集群化软件，多数需要远程登录以及远程执行命令，为方便操作，配置三台Linux服务器之间的免密码互相SSH登陆

1.  在每一台机器都执行以下命令，一路回车到底即可
    
        # 生成RSA类型的SSH密钥对
        ssh-keygen -t rsa -b 4096
2.  在每一台机器都执行:
    
        ssh-copy-id node1
        ssh-copy-id node2
        ssh-copy-id node3
3.  执行完毕后，node1、node2、node3之间将完成root用户之间的免密互通
4.  结果验证：使用ssh 尝试ssh免密登录，使用exit退出ssh登录
    
        ssh nodeX # X=1,2,3

--------------------

#### 3.3.2 实际操作代码演示 ####

*  node1操作演示

[root@node1 ~]# ssh-keygen -t rsa -b 4096
    Generating public/private rsa key pair.
    Enter file in which to save the key (/root/.ssh/id_rsa):
    Created directory '/root/.ssh'.
    Enter passphrase (empty for no passphrase):
    Enter same passphrase again:
    Your identification has been saved in /root/.ssh/id_rsa.
    Your public key has been saved in /root/.ssh/id_rsa.pub.
    The key fingerprint is:
    SHA256:4TDo7BBnEV5mElAYIaisiAPHNWJop53JqV/fV5M9SJg root@node1
    The key's randomart image is:
    +---[RSA 4096]----+
    |o.+**o+          |
    |oo+ooB           |
    |+o*oO.o .   o    |
    |ooo%   + . E .   |
    |=.o o   S   . +  |
    |=. o .       = o |
    | .. o . .   . . .|
    |   .   . . .     |
    |          .      |
    +----[SHA256]-----+
    [root@node1 ~]# cd .ssh/
    [root@node1 .ssh]# ll
    total 8
    -rw-------. 1 root root 3243 Aug 17 02:04 id_rsa
    -rw-r--r--. 1 root root  736 Aug 17 02:04 id_rsa.pub
    [root@node1 .ssh]# ssh-copy-id node1
    /usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"
    The authenticity of host 'node1 (192.168.28.131)' can't be established.
    ECDSA key fingerprint is SHA256:3NA7v7hCoa8BvOZIadiAgyg9PQDmh7FwFzmcmBVPeu4.
    ECDSA key fingerprint is MD5:03:b5:a7:d6:d6:b1:39:19:fa:ce:1b:71:1b:c5:fb:2d.
    Are you sure you want to continue connecting (yes/no)? yes
    /usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
    /usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
    root@node1's password:
    
    Number of key(s) added: 1
    
    Now try logging into the machine, with:   "ssh 'node1'"
    and check to make sure that only the key(s) you wanted were added.
    
    [root@node1 .ssh]# cd ~
    [root@node1 ~]# ssh-copy-id node2
    /usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"
    The authenticity of host 'node2 (192.168.28.132)' can't be established.
    ECDSA key fingerprint is SHA256:3NA7v7hCoa8BvOZIadiAgyg9PQDmh7FwFzmcmBVPeu4.
    ECDSA key fingerprint is MD5:03:b5:a7:d6:d6:b1:39:19:fa:ce:1b:71:1b:c5:fb:2d.
    Are you sure you want to continue connecting (yes/no)? yes
    /usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
    /usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
    root@node2's password:
    
    Number of key(s) added: 1
    
    Now try logging into the machine, with:   "ssh 'node2'"
    and check to make sure that only the key(s) you wanted were added.
    
    [root@node1 ~]# ssh-copy-id node3
    /usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"
    The authenticity of host 'node3 (192.168.28.133)' can't be established.
    ECDSA key fingerprint is SHA256:3NA7v7hCoa8BvOZIadiAgyg9PQDmh7FwFzmcmBVPeu4.
    ECDSA key fingerprint is MD5:03:b5:a7:d6:d6:b1:39:19:fa:ce:1b:71:1b:c5:fb:2d.
    Are you sure you want to continue connecting (yes/no)? yes
    /usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
    /usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
    root@node3's password:
    
    Number of key(s) added: 1
    
    Now try logging into the machine, with:   "ssh 'node3'"
    and check to make sure that only the key(s) you wanted were added.

*  结果验证

[root@node1 ~]# ssh node1
    Last login: Thu Aug 17 01:06:49 2023 from 192.168.28.1
    [root@node1 ~]# exit
    logout
    Connection to node1 closed.
    [root@node1 ~]# ssh node2
    Last login: Thu Aug 17 01:07:12 2023 from 192.168.28.1
    [root@node2 ~]# exit
    logout
    Connection to node2 closed.
    [root@node1 ~]# ssh node3
    Last login: Thu Aug 17 01:07:38 2023 from 192.168.28.1
    [root@node3 ~]# exit
    logout
    Connection to node3 closed.

#### 3.3.3 知识补充：ssh-keygen ####

*  SSH密钥对由两个密钥组成：私钥（private key）和公钥（public key）。私钥应该保持机密，而公钥可以被传递给其他人，用于加密数据。

ssh-keygen -t rsa -b 4096

*  该命令是用于生成RSA类型的SSH密钥对。

1.  `-t rsa`：指定生成RSA密钥对。
2.  `-b 4096`：指定密钥的位数为4096位。较长的密钥位数提供了更高的安全性，但也增加了生成和加密解密的计算负担。

*  运行该命令后，提示选择一个文件名和位置来保存生成的私钥和公钥。默认情况下，私钥存储在`~/.ssh/id_rsa`，而公钥存储在`~/.ssh/id_rsa.pub`。
 *  一旦生成了密钥对，私钥将用于与远程主机建立安全的SSH连接，而公钥则用于验证身份。常见的用例是将公钥添加到远程主机的`~/.ssh/authorized_keys`文件中，允许使用私钥的主机登录到该远程主机上，而无需输入密码。  
    注意：**生成的SSH密钥对是非对称密钥对，私钥和公钥是相关联的，但是无法从公钥推导出私钥。因此，私钥必须高度保密，只有合适的人员才能访问。**

--------------------

#### 3.3.4 创建hadoop用户并配置免密登录 ####

*  实际环境中，大数据的软件，将不会以root用户启动（确保安全，养成良好的习惯)
 *  我们为大数据的软件创建一个单独的用户hadoop，并为三台服务器同样配置hadoop用户的免密互通

1.  在每一台机器执行: `useradd hadoop`，创建hadoop用户
2.  在每一台机器执行: `passwd hadoop`，设置hadoop用户密码为`123456`
3.  在每一台机器均切换到`hadoop`用户: `su - hadoop`，并执行`ssh-keygen -t rsa -b 4096`，创建ssh密钥
4.  在每一台机器均执行
    
        ssh-copy-id node1
        ssh-copy-id node2
        ssh-copy-id node3

--------------------

*  操作演示

[root@node3 ~]# useradd hadoop
    [root@node3 ~]# passwd hadoop
    Changing password for user hadoop.
    New password:
    Retype new password:
    passwd: all authentication tokens updated successfully.

[root@node3 ~]# su - hadoop
    [hadoop@node3 ~]$ ssh-keygen -t rsa -b 4096
    Generating public/private rsa key pair.
    
    Enter file in which to save the key (/home/hadoop/.ssh/id_rsa): Created directory '/home/hadoop/.ssh'.
    Enter passphrase (empty for no passphrase):
    Enter same passphrase again:
    Your identification has been saved in /home/hadoop/.ssh/id_rsa.
    Your public key has been saved in /home/hadoop/.ssh/id_rsa.pub.
    The key fingerprint is:
    SHA256:5gh9saZKQ6ysTEo6O1bz0Dej54bQ5oEREyxTW/3yezc hadoop@node3
    The key's randomart image is:
    +---[RSA 4096]----+
    |  oo...          |
    | o +o  .         |
    |  o.o   o        |
    |   o . . +       |
    |    O . S        |
    | . O * @ .       |
    | o+ X B + .      |
    |Oo . B o . . E   |
    |*=  . +.  . . .  |

[hadoop@node1 .ssh]$ ssh-copy-id node1
    /bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/home/hadoop/.ssh/id_rsa.pub"
    The authenticity of host 'node1 (192.168.28.131)' can't be established.
    ECDSA key fingerprint is SHA256:3NA7v7hCoa8BvOZIadiAgyg9PQDmh7FwFzmcmBVPeu4.
    ECDSA key fingerprint is MD5:03:b5:a7:d6:d6:b1:39:19:fa:ce:1b:71:1b:c5:fb:2d.
    Are you sure you want to continue connecting (yes/no)? yes
    /bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
    /bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
    hadoop@node1's password:
    
    Number of key(s) added: 1
    
    Now try logging into the machine, with:   "ssh 'node1'"
    and check to make sure that only the key(s) you wanted were added.
    
    [hadoop@node1 .ssh]$ ssh-copy-id node2
    /bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/home/hadoop/.ssh/id_rsa.pub"
    The authenticity of host 'node2 (192.168.28.132)' can't be established.
    ECDSA key fingerprint is SHA256:3NA7v7hCoa8BvOZIadiAgyg9PQDmh7FwFzmcmBVPeu4.
    ECDSA key fingerprint is MD5:03:b5:a7:d6:d6:b1:39:19:fa:ce:1b:71:1b:c5:fb:2d.
    Are you sure you want to continue connecting (yes/no)? yes
    /bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
    /bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
    hadoop@node2's password:
    
    Number of key(s) added: 1
    
    Now try logging into the machine, with:   "ssh 'node2'"
    and check to make sure that only the key(s) you wanted were added.
    
    [hadoop@node1 .ssh]$ ssh-copy-id node3
    /bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/home/hadoop/.ssh/id_rsa.pub"
    The authenticity of host 'node3 (192.168.28.133)' can't be established.
    ECDSA key fingerprint is SHA256:3NA7v7hCoa8BvOZIadiAgyg9PQDmh7FwFzmcmBVPeu4.
    ECDSA key fingerprint is MD5:03:b5:a7:d6:d6:b1:39:19:fa:ce:1b:71:1b:c5:fb:2d.
    Are you sure you want to continue connecting (yes/no)? yes
    ^[[A/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
    /bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
    hadoop@node3's password:
    
    Number of key(s) added: 1
    
    Now try logging into the machine, with:   "ssh 'node3'"
    and check to make sure that only the key(s) you wanted were added.
    
    [hadoop@node1 .ssh]$ ssh node1
    Last login: Thu Aug 17 02:22:01 2023 from node2
    [hadoop@node1 ~]$ exit
    logout
    Connection to node1 closed.
    [hadoop@node1 .ssh]$ ssh node2
    Last login: Thu Aug 17 02:22:10 2023 from node2
    [hadoop@node2 ~]$ exit
    logout
    Connection to node2 closed.
    [hadoop@node1 .ssh]$ ssh node3
    Last login: Thu Aug 17 02:22:13 2023 from node2
    [hadoop@node3 ~]$ exit
    logout
    Connection to node3 closed.

### 3.4 JDK环境部署 ###

*  JDK: Java Development Kit，是用于Java语言开发的环境。
 *  大数据的很多软件的运行都需要有Java运行环境的支持，所以需要在三台服务器上，预先都部署好JDK环境。
 *  部署JDK不需要懂得Java语言，只需要掌握Linux相关命令即可。
 *  课程中使用JDK1.8版本

--------------------

1.  下载[JDK软件][JDK]  
    ![在这里插入图片描述][4c8c38e924a24406b2c7fd44c2c7aff1.png]  
    ![在这里插入图片描述][ec1afcc4b2a947839d7fb61470d42d64.png]

*  在弹出的页面中输入Oracle的账户密码即可下载（如无账户，请自行注册，注册是免费的)

--------------------

1.  创建文件夹，用来部署JDK，将JDK和Tomcat都安装部署到: `/export/server`内，将压缩包上传到linux解压缩JDK安装文件

mkdir /export/server
    tar -zvxf jdk-8u361-linux-x64.tar.gz -C /export/server/

1.  进入`/export/server`目录，配置JDK的软链接

[root@node1 server]# ln -s /export/server/jdk1.8.0_361 jdk8
    [root@node1 server]# ll
    total 4
    drwxr-xr-x. 8 root root 4096 Aug 17 02:35 jdk1.8.0_361
    lrwxrwxrwx. 1 root root   27 Aug 17 02:37 jdk8 -> /export/server/jdk1.8.0_361

1.  配置`JAVA_HOME`环境变量，以及将`$AVA_HOME/bin`文件夹加入PATH环境变量中
    
        vim /etc/profile
    
     *  编辑`/etc/profile`文件，添加以下内容
    
        export JAVA_HOME=/export/server/jdk8
        export PATH=$PATH:$JAVA_HOME/bin
2.  生效环境变量
    
        source /etc/profile
3.  配置java执行程序的软连接
    
        [root@node1 server]# rm -f /usr/bin/java
        [root@node1 server]# ln -s /export/server/jdk8/bin/java /usr/bin/java
4.  执行验证
    
        java -version
        javac -version

### 3.5 防火墙、SELinux ###

*  集群化软件之间需要通过端口互相通讯，为了避免出现网络不通的问题，可以关闭防火墙。**\[在每一台机器都执行，执行以下命令\]**

systemctl stop firewalld
    systemctl disable firewalld

*  Linux有一个安全模块:SELinux，用以限制用户和程序的相关权限，来确保系统的安全稳定。在当前，我们只需要关闭SELinux功能，避免导致后面的软件运行出现问题即可\*\*\[在每一台机器都执行\]\*\*

vim /etc/sysconfig/selinux

*  将第七行，`SELINUX=enforcing`改为

SELINUX=disabled

*  保存退出后，重启虚拟机即可，**千万要注意disabled单词不要写错，不然无法启动系统**

### 3.6 修改时区并配置自动时间同步 ###

*  请使用root身份执行命令

# 1. 安装ntp软件按
    yum install -y ntp
    # 2. 更新时区
    rm -f /etc/localtime;sudo ln -s /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
    # 3. 同步时间
    ntpdate -u ntp.aliyun.com
    # 4. 开启ntp服务并设置开机自启
    systemctl start ntpd
    systemctl enable ntpd

### 3.7 设置快照 ###

*  目前Linux虚拟机的状态基本准备就绪，可以对当前状态进行快照保存，以备后续恢复。对三台虚拟机均执行拍摄快照。  
    ![在这里插入图片描述][11e7baaecc984f98beb85ff6ca8fcaef.png]  
    ![在这里插入图片描述][367312e31ecb49439b13ab2c849ad049.png]

[63aa582ed8ce409b9f2bcf82c90c146d.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/13/b6d5a0d0a76940fa81f3c6d5a3302696.png
[Linux]: https://yuanyou.blog.csdn.net/article/details/128828741
[2af55a2e8c864e179153dabad65ab1ce.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/13/8d6395a2a5574c9cb625d6a94dc68370.png
[fb27b83ccb974b17979bd08a4b7e0611.gif_pic_center]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/13/91d756a15c7f4170b244784c2bd99e87.png
[Free Manager Download]: https://www.freedownloadmanager.org/zh/
[023f5bae5843417b8c93cbcc9f29ce4d.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/13/c29a3fd7b06346a095241fc37e61464b.png
[8b4a9ad32e8b45d48eb4dcfee9acf440.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/13/90d5d91828a248d08a448fcedb8c6c99.png
[8a1bb62862364abcbb51ad7ed82a596e.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/13/b07723b6cfb94a0daa803d6cc0538030.png
[b63f9dfad3e84b0b8fe684946f59ee2a.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/13/1066a44332c049d59f322fc6f29517d7.png
[982c2d90bdf14ae0b79f331bacc5e4ca.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/13/9d1508ce147c4d79a9cd1f1b26b59d29.png
[d9f1403f114f4af0ab01309ba287b09f.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/13/12b544b74f7543cbb8cd71917b326bae.png
[ea780248258e41b0ac153d16cfb6547c.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/13/c06d85953c2540c7999a9a4caa2630d3.png
[2b94b8449f824a6e8c81a317003c95a7.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/13/0229d2ab07a8403d9e453cee58131aec.png
[f6385d32b67b496db0d88180271017d3.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/13/28b7da7b581f45b0b99fbe7612589b2f.png
[a7adf0fbd1764cbba0bb0225e44c8925.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/13/9156a236a3674eb7b1bf3825a934a346.png
[0ad234cca6844c02ad7359afed27f2ed.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/13/c9355d8a9c3b4ccab990dafd0fb827dc.png
[81d0fa1e9e094650a4d9882ddb0f1cf2.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/13/b972b82e8d4747158c18da09f910fb0d.png
[282546822059422f8249332b9e9eb7f5.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/13/b4ad92294eb84505af2d77a9a2a34528.png
[cc373c978bb94115ac23575fd75d7538.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/13/2558ba7a0276467b85a7f803d7125c0d.png
[JDK]: https://www.oracle.com/java/technologies/download
[4c8c38e924a24406b2c7fd44c2c7aff1.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/13/2c491ec4c4df4d4cb5b29f83de7a94d5.png
[ec1afcc4b2a947839d7fb61470d42d64.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/13/326b1a5bf8ae4a04a53c0cb2d24d6c3b.png
[11e7baaecc984f98beb85ff6ca8fcaef.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/13/c625ad101ad541e2b49f2015e26f98c7.png
[367312e31ecb49439b13ab2c849ad049.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/13/ec2628b41933425b920c90d0cbc6f699.png