CentOS7下JDK的安装

查看已安装的JDK版本:

java -version

查看已安装的JDK:

rpm -qa | grep jdk

卸载JDK:

rpm -e --nodeps [JDK name1] [JDK name2] [JDK name3]

        或者

yum -y remove [JDK name1] [JDK name2] [JDK name3]

查看JAVA相关文件:

rpm -qa | grep java

卸载JAVA相关文件:

rpm -e --nodeps [name1] [name2] [name3]

下载JDK安装包 

解压JDK安装包:

tar -zxvf [jdk-xuxxx-linux-xxx.tar.gz]

移动解压后文件至/usr/local/jdk:

mv [jdkx.x.x_xxx] /usr/local/jdk

配置:

sed -i '$a ulimit -n 65535' /etc/profile

sed -i '$a export JAVA_HOME=/usr/local/jdk' /etc/profile

sed -i '$a export JRE_HOME=$JAVA_HOME/jre' /etc/profile

sed -i '$a export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH' /etc/profile

sed -i '$a export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH' /etc/profile

source /etc/profile

检测安装是否成功:

java -version

javac