在CentOS 7服务器上安装JDK

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

*下文以安装 jdk1.8.0_162为范例

解压JDK安装包:

tar -zxvf jdk-8u162-linux-x64.tar.gz

创建文件夹/usr/local/jdk/jdk1.8.0_162:

mkdir /usr/local/jdk/jdk1.8.0_162

移动解压后文件至/usr/local/jdk/jdk1.8.0_162:

mv jdk1.8.0_162 /usr/local/jdk/jdk1.8.0_162

配置:

sed -i '$a ulimit -n 65535' /etc/profile
sed -i '$a export JAVA_HOME=/usr/local/jdk/jdk1.8.0_162' /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