Linux安装卸载JDK(1.7 rpm)
一、卸载系统已有的JDK
1、查看已安装的jdk
rpm -qa|grep jdk
![](https://images2015.cnblogs.com/blog/35158/201609/35158-20160918114806787-613114854.png)
2、卸载jdk
rpm -e --nodeps java-1.6.0-openjdk-1.6.0.0-1.66.1.13.0.el6.x86_64
![](https://images2015.cnblogs.com/blog/35158/201609/35158-20160918114807678-2143503925.png)
二、下载并安装JDK1.7
1、下载jdk-7u79-linux-x64.rpm
![](https://images2015.cnblogs.com/blog/35158/201609/35158-20160918114808584-1051277563.png)
2、拷贝到目录:cd /usr/local/src
执行安装:rpm -ivh jdk-7u79-linux-x64.rpm
![](https://images2015.cnblogs.com/blog/35158/201609/35158-20160918114809365-1781218826.png)
三、配置环境变量
1、 打开配置文件
vim /etc/profile
2、添加配置信息
JAVA_HOME=/usr/java/jdk1.7.0_79
TOMCAT_HOME=/home/syx/server/tomcat
PATH=$JAVA_HOME/bin:$PATH
CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export JAVA_HOME
export TOMCAT_HOME
export PATH
export CLASSPATH
3、立即生效配置文件
source /etc/profile
4、验证配置信息
echo $JAVA_HOME
echo $PATH
echo $CLASSPATH