centos7安装jdk/java

1、下载压缩文件：wget https://download.oracle.com/otn/java/jdk/8u261-b12/a4634525489241b9a9e1aa73d9e118e6/jdk-8u261-linux-i586.tar.gz?AuthParam=1599036362_c2bc31043666834b43b1ffea2ceafd5a

2、解压到/usr/java，该目录下面的文件为：jdk1.8.0_261

3、vi /etc/profile，在最下面添加

#java environment

export JAVA_HOME=/usr/java/jdk1.8.0_261

export CLASSPATH=.:${JAVA_HOME}/jre/lib/rt.jar:${JAVA_HOME}/lib/dt.jar:${JAVA_HOME}/lib/tools.jar

export PATH=$PATH:${JAVA_HOME}/bin

4、重启配置文件：source /etc/profile

5、关闭当前终端，重新打开一个终端即可