一、卸载jdk
1.查看Linux自带的JDK是否已安装
- java –version
2.查看jdk信息
- rpm -qa|grep java
- rpm -qa|grep jdk
3.卸载JDK,执行以下操作:
- rpm -e --nodeps tzdata-java-2012c-1.el6.noarch
- rpm -e --nodeps java-1.7.0-openjdk-1.7.0.45-1.45.1.11.1.el6.x86_64
- .
- .
- .
- 等等
二、安装JDK
1.新建路径
- mkdir /usr/lib/jvm
- tar zxvf jdk-7u67-linux-x64.tar.gz -C /usr/lib/jvm
2.配置环境变量
- vi /etc/profile
-
加入环境变量内容#set java environment
export JAVA_HOME=/usr/lib/jvm/jdk1.7.0_67
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH
3.设置默认JDK
- update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.7.0_67/bin/java 300
- update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.7.0_67/bin/javac 300
4.测试
- java -version
- java
- javac