我本地的Linux环境是Ubuntu，安装需要用到apt命令

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Ubuntu下安装JDK

1. 更新软件包列表

sudo apt-get update

2. 安装JDK

sudo apt-get install openjdk-8-jdk

3. 查看Java版本，看是否安装成功

java -version

openjdk version "1.8.0_252"
OpenJDK Runtime Environment (build 1.8.0_252-8u252-b09-1ubuntu1-b09)
OpenJDK 64-Bit Server VM (build 25.252-b09, mixed mode)

4. 出现JDK版本说明安装成功

5. 还可以通过输入java和javac查看是否安装成功

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Ubuntu下安装MySQL

1.安装MySQL

sudo apt-get install mysql-server

2. 安装完成连接MySQL

mysql -h 127.0.0.1 -u root -p

Enter password:
输入MySQL密码就可以链接成功

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 15
Server version: 5.5.5-10.1.38-MariaDB mariadb.org binary distribution

Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

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Ubuntu下安装tomcat

1. 下载tomcat

wget https://downloads.apache.org/tomcat/tomcat-9/v9.0.36/bin/apache-tomcat-9.0.36.zip

2. 更改权限

chmod +x apache-tomcat-9.0.36.zip

3. 解压压缩包

unzip apache-tomcat-9.0.36.zip

如果提示 -bash:unzip not found 是因为没有下载unzip

yum install unzip

下载完重新解压就好了

4. 解压后就得到了tomcat包，此时对apache-tomcat-9.0.36再次更改权限

chmod a+x -R *

5. 进入apache-tomcat-9.0.36

cd apache-tomcat-9.0.36

6. 进入bin目录

cd bin

7. 启动tomcat的命令 进入到apache-tomcat-9.0.36的bin目录下后，执行下面命令

sh startup.sh

这样就启动成功了