1、Java的安装

1. 载 jdk1.8 注：此处 CentOS7 是64位，所以下载的是：Linux x64， 文件类型为 tar.gz 的文件
   JDK 官网地址：https://www.oracle.com/java/

cd /usr/local/
mkdir jdk
cd jdk/

tar -xvf jdk-8u202-linux-x64.tar.gz

mv jdk1.8.0_202/ jdk1.8

3. 配置 jdk 环境，输入编辑指令：

vim /etc/profile

#set java enviroment
JAVA_HOME=/usr/local/jdk/jdk1.8 
CLASSPATH=.:$JAVA_HOME/lib.tools.jar
PATH=$JAVA_HOME/bin:$PATH
export JAVA_HOME CLASSPATH PATH

4. JAVA_HOME= jdk 的安装路径，编辑完毕，按下键盘的 Esc 退出编辑模式，再输入指令：

wq!

java -version

2、Tomcat 压缩包下载

1. 下载 apache-tomcat-9.0.65.tar
   下载地址：https://tomcat.apache.org/download-90.cgi
   
2. 把 tomcat 压缩包上传云服务器界面，直接鼠标选中文件拖动即可

mkdir tomcat
cd tomcat/
mkdir tomcat9
cd tomcat9/

tar -xvf apache-tomcat-9.0.82.tar.gz

mv apache-tomcat-9.0.82 tomcat9

./startup

3、MySQL安装

//MySQL8版本的安装
TMOUT=0
wget http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm
yum localinstall mysql57-community-release-el7-8.noarch.rpm
yum repolist enabled | grep "mysql.*-community.*"
rpm --import https://repo.mysql.com/RPM-GPG-KEY-mysql-2022
yum install mysql-community-server
systemctl start mysqld
systemctl status mysqld
systemctl enable mysqld
systemctl daemon-reload
grep 'temporary password' /var/log/mysqld.log
mysql -u root -p
ALTER USER 'root'@'localhost' IDENTIFIED BY 'Huawei123!';
use mysql;
update user set host = '%' where user = 'root';
select host,user from user;
flush privileges;

//Mysql57版本安装
TMOUT=0
wget http://dev.mysql.com/get/mysql57-community-release-el7-8.noarch.rpm
yum localinstall mysql57-community-release-el7-8.noarch.rpm
yum repolist enabled | grep "mysql.*-community.*"
rpm --import https://repo.mysql.com/RPM-GPG-KEY-mysql-2022
yum install mysql-community-server
systemctl start mysqld
systemctl status mysqld
systemctl enable mysqld
systemctl daemon-reload
grep 'temporary password' /var/log/mysqld.log
mysql -u root -p
ALTER USER 'root'@'localhost' IDENTIFIED BY 'Huawei123!';
use mysql;
update user set host = '%' where user = 'root';
select host,user from user;
flush privileges;

4、