1. Install java jdk
1. Check whether the JDK that comes with CentOS has been installed
Method 1: yum list installed |grep java
Method 2: rpm -qa | grep jdk
rpm -qa | grep gcj
2. Uninstall:
Uninstall the corresponding version of the JDK related files input: yum -y remove java-1.7.0-openjdk*
To uninstall tzdata-java enter: yum -y remove tzdata-java.noarch
When the result is displayed as Complete! The uninstallation is complete.
3. View the Java installation package in the yum library.
Type: yum -y list java*
4. Install the corresponding version of jdk
yum -y install java-1.7.0-openjdk*
java -version to view the Java version
Finish!
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There are several other jdk installation methods, which will not be introduced here. Favorite the address, as if you didn't see me.
Download jdk:
http://www.oracle.com/technetwork/java/javasebusiness/downloads/java-archive-downloads-javase6-419409.html#jdk-6u21-oth-JPR
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二、安装mysql
1、MySQL依赖 libaio，所以先要安装libaio
yum search libaio # 检索相关信息
yum install libaio # 安装依赖包
2、检查 MySQL是否已安装
yum list installed | grep mysql
如果有，就先全部卸载，命令如下：
yum -y remove mysql-libs.x86_64
若有多个依赖文件则依次卸载。当结果显示为 Complete！即卸载完毕。
3、下载 MySQL Yum Repository
地址为 http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm
执行：
wget http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm
如果提示-bash: wget: 未找到命令，请先执行yum install wget 安装wget
4、安装
添加 MySQL Yum Repository
添加 MySQL Yum Repository 到你的系统repository 列表中，执行
yum localinstall mysql-community-release-el7-5.noarch.rpm
提示是否 OK ，输入y
5、验证下是否添加成功
yum repolist enabled | grep "mysql.*-community.*"
6、查看 MySQL版本
yum repolist all | grep mysql
可以看到 5.5，5.7 版本是默认禁用的，因为现在最新的稳定版是5.6
可以通过类似下面的语句来启动某些版本
yum-config-manager --disable mysql56-community
yum-config-manager --enable mysql57-community-dmr
可以通过类似下面的语句来启动某些版本
yum-config-manager --disable mysql56-community
yum-config-manager --enable mysql57-community-dmr
其中 enabled=0 是指禁用，enabled=1指启用。
注意： 任何时候，只能启用一个版本。
查看当前的启动的 MySQL 版本，执行
yum repolist enabled | grep mysql
7、通过 Yum来安装 MySQL
yum install mysql-community-server
Yum 会自动处理 MySQL与其他组件的依赖关系
y 继续，执行完成会提示“完毕！”。此时MySQL安装完成，它包含了 mysql-community-server、mysql-community-client、mysql-community-common、mysql-community-libs四个包。
rpm -qi mysql-community-server.x86_64 0:5.6.24-3.el7
whereis mysql
8、启动 MySQL Server
systemctl start mysqld
9、关闭 MySQL Server
systemctl stop mysqld
10、测试是否安装成功
Mysql
tomcat可以下载绿色版直接使用