Ubuntu18.04 linux系统安装JDK与Mysql的方法

平台部署

一、安装JDK

step1.下载OracleJDK

step2. 解压

step3. 加入环境变量

具体操作如下：

lemon@ubuntu:~$ cd ~/download/

lemon@ubuntu:~/download$ wget https://download.oracle.com/otn-pub/java/jdk/13.0.2+8/d4173c853231432d94f001e99d882ca7/jdk-13.0.2_linux-x64_bin.tar.gz

lemon@ubuntu:~/download$ tar vxf jdk-8u191-linux-x64.tar.gz

lemon@ubuntu:~/download$ ls #查看当前目录下的文件

jdk1.8.0_191 jdk-8u191-linux-x64.tar.gz

lemon@ubuntu:~/download$ sudo mv jdk1.8.0_191/ /usr/local/jdk1.8/ #将jdk1.8.0_191文件夹移动到/usr/local/下并重命名为jdk1.8

lemon@ubuntu:~/download$ sudo vim /etc/profile #编辑环境变量

在环境变量末尾加入如下内容:

export JАVA_HOME=/usr/local/jdk1.8

export JRE_HOME=${JАVA_HOME}/jre

export CLASSPATH=.:${JАVA_HOME}/lib:${JRE_HOME}/lib

export PATH=.:${JАVA_HOME}/bin:$PATH

保存后重新加载环境变量，使生效：

lemon@ubuntu:~/download$ source /etc/profile #刷新环境变量，使生效

lemon@ubuntu:~$ java -version#输入java -version，如显示以下信息，则JDK安装成功

java version “1.8.0_191”

Java(TM) SE Runtime Environment (build 1.8.0_191-b12)

Java HotSpot(TM) 64-Bit Server VM (build 25.191-b12, mixed mode)

二、安装MySQL

step1. 安装MySQL并配置

step2. 创建数据库与表

由于在安装Ubuntu系统时，本人选择了安装LAMP服务，所以MySQL已安装完成，仅需设置即可启用。

测试是否安装：

lemon@ubuntu:~$ mysql #输入mysql，如出现以下提示，说明已安装mysql

ERROR 1045 (28000): Access denied for user ‘lemon’@’localhost’ (using password: NO)

如未安装：

lemon@ubuntu:~$ sudo apt-get install mysql-server

lemon@ubuntu:~$sudo apt isntall mysql-client

lemon@ubuntu:~$sudo apt install libmysqlclient-dev

如已安装：

lemon@ubuntu:~$ sudo mysql_secure_installation

两者都会进入MySQL设置过程，具体设置内容如下：

#1

VALIDATE PASSWORD PLUGIN can be used to test passwords…

Press y|Y for Yes, any other key for No: N(不启用弱密码检查）

#2

Please set the password for root here…

New password: (设置root密码)

Re-enter new password: (重复输入)

#3

By default, a MySQL installation has an anonymous user,

allowing anyone to log into MySQL without having to have

a user account created for them…

Remove anonymous users? (Press y|Y for Yes, any other key for No) : Y(不启用匿名用户)

#4

Normally, root should only be allowed to connect from

‘localhost’. This ensures that someone cannot guess at

the root password from the network…

Disallow root login remotely? (Press y|Y for Yes, any other key for No) : Y (不允许root远程登陆)

#5

By default, MySQL comes with a database named ‘test’ that

anyone can access…

Remove test database and access to it? (Press y|Y for Yes, any other key for No) : N

#6

Reloading the privilege tables will ensure that all changes

made so far will take effect immediately.

Reload privilege tables now? (Press y|Y for Yes, any other key for No) : Y (立刻刷新权限表)

All done!

接下来进入进入MySQL进行操作：

#最新版的MySQL安装之后无法使用密码进行登陆，需要sudo登录修改登录方式

lemon@ubuntu:~$ sudo mysql -uroot -p

Enter password: （空密码）

mysql>

mysql>UPDATE mysql.user SET authentication_string=PASSWORD(‘LEMON’), plugin=’mysql_native_password’ WHERE user=’root’;

mysql> FLUSH PRIVILEGES;

mysql>exit

lemon@ubuntu:~$ sudo service mysql restart

lemon@ubuntu:~$ mysql -u root -p

Enter password: （上一步设置的密码，PASSWORD括号内的）

mysql>CREATE DATABASE nutch;

mysql>USE nutch

mysql> CREATE TABLE `webpage` (

`id` varchar(767) NOT NULL,

`headers` blob,

`text` mediumtext DEFAULT NULL,

`status` int(11) DEFAULT NULL,

`markers` blob,

`parseStatus` blob,

`modifiedTime` bigint(20) DEFAULT NULL,

`score` float DEFAULT NULL,

`typ` varchar(32) CHARACTER SET latin1 DEFAULT NULL,

`baseUrl` varchar(767) DEFAULT NULL,

`content` longblob,

`title` varchar(2048) DEFAULT NULL,

`reprUrl` varchar(767) DEFAULT NULL,

`fetchInterval` int(11) DEFAULT NULL,

`prevFetchTime` bigint(20) DEFAULT NULL,

`inlinks` mediumblob,

`prevSignature` blob,

`outlinks` mediumblob,

`fetchTime` bigint(20) DEFAULT NULL,

`retriesSinceFetch` int(11) DEFAULT NULL,

`protocolStatus` blob,

`signature` blob,

`metadata` blob,

`batchId`varchar(767)DEFAULT NULL,

PRIMARY KEY (`id`)

) ENGINE=InnoDB

ROW_FORMAT=COMPRESSED

DEFAULT CHARSET=utf8mb4;

mysql>exit

*最新版本默认情况下，MySQL是不允许远程登录的，如需远程访问需要做一些修改：

lemon@ubuntu:~$sudo vim /etc/mysql/mysql.conf.d/mysqld.cnf

#将bind-address = 127.0.0.1注释掉，重启MySQL服务

lemon@ubuntu:~$sudo service mysqld start

接下来就可以通过Navicat等软件，在其他计算机访问数据库了。

这样就Ok了