1,下载http://download.oracle.com/otn-pub/java/jdk/7u9-b05/jdk-7u9-linux-i586.tar.gz
2,解压 tar -zxvf jdk-7u9-linux-i586.tar.gz
3,移动解压后的文件夹jdk1.7.0_09到适当位置 mv jdk1.7.0_09 /usr/bin/jvm ( 需要root权限且实现建立jvm文件)
4,设置环境变量 vi ~/.bashrc
在文件后面添加
export JAVA_HOME=/usr/bin/jvm export JRE_HOME=${JAVA_HOME}/jre export CLASSPATH=.:${JAVA_HOME}/lib:${JAVA_JRE}/lib:$CLASSPATH export PATH=${JAVA_HOME}/bin:${JAVA_JRE}/bin:$PATH
5,修改系统默认JDK
sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.7.0_09/bin/java 300
sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.7.0_09/bin/javac 300
6,检测 java -version 显示以下内容表示成功
java version "1.7.0_09" Java(TM) SE Runtime Environment (build 1.7.0_09-b05) Java HotSpot(TM) Server VM (build 23.5-b02, mixed mode)