Centos 7 下的java安装

mkdir java

tar -zxvf "jdk名称，例如jdk-8u171-linux-x64.tar.gz" -C /usr/local/java/

vim /etc/profile

export JAVA_HOME=/usr/local/java/“安装后的目录的名称，如jdk1.8.0_171，可进入java目录下查看”
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH

source /etc/profile
`

ln -s /usr/local/java/”java下的jdk目录名称“/bin/java /usr/bin/java

java -version