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Linux发行版:CentOS-7-x86_64-DVD-1804.iso
FTP工具:FileZilla_3.32.0-rc1_win64-setup.exe
当前安装路径(/usr/local/java)
解压 JDK
# tar -zxvf jdk-7u79-linux-x64.tar.gz
# vim /etc/profile
##########################################jdk环境变量配置#########################################export JAVA_HOME=/usr/local/java/jdk1.7.0_79export CLASSPATH=.:${JAVA_HOME}/jre/lib/rt.jar:${JAVA_HOME}/lib/tools.jarexport PATH=$PATH:${JAVA_HOME}/bin
# source /etc/profile 或者 ./etc/profile
# java -version
[comuser@localhost jdk1.7.0_79]$ java -versionjava version "1.7.0_79"Java(TM) SE Runtime Environment (build 1.7.0_79-b15)Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode)
comuser@localhost java]$ java -versionopenjdk version "1.8.0_161"OpenJDK Runtime Environment (build 1.8.0_161-b14)OpenJDK 64-Bit Server VM (build 25.161-b14, mixed mode)[comuser@localhost java]$
这里需要卸载 openjdk,卸载步骤如下:
# yum list installed | grep java
#--卸载openjdk 1.7# yum -y remove java-1.7.0-openjdk.x86_64# yum -y remove java-1.7.0-openjdk-headless.x86_64#--卸载openjdk 1.8# yum -y remove java-1.8.0-openjdk.x86_64# yum -y remove java-1.8.0-openjdk-headless.x86_64
#--重新使/etc/profile文件的jdk配置生效# source /etc/profile#--查询jdk版本# java -version
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