配置环境变量,vi /etc/profile,在文件最后添加配置 JAVA_HOME=/usr/local/java/jdk1.8.0_231/ JRE_HOME=/usr/local/java/jdk1.8.0_231/jre CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin export JAVA_HOME JRE_HOME CLASS_PATH PATH