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1、新建jvm文件夹-解压
# mkdir /usr/lib/jvm # tar zxvf jdk-7u79-linux-x64.gz -C /usr/lib/jvm
2、设置环境变量，在/etc/profile文件的最后面增加：
# vi /etc/profile export JAVA_HOME=/usr/lib/jvm/jdk1.7.0_79 export JRE_HOME=${JAVA_HOME}/jre export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib export PATH=${JAVA_HOME}/bin:$PATH
3、将系统默认的jdk修改过来
# update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.7.0_79/bin/java 300 # update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.7.0_79/bin/javac 300 # update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/jdk1.7.0_79/bin/jar 300 # update-alternatives --config java # update-alternatives --config javac #update-alternatives --config jar
4、测试
# java -version java 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)
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原文地址：http://www.cnblogs.com/zhenyuyaodidiao/p/4821246.html
