1、 下载jdk1.7的linux版本http://www.oracle.com/technetwork/java/javase/downloads/server-jre7-downloads-1931105.html;
2、上传到linux系统上去, 我上传到/boot/share_folder/, 进入此目录,命令:cd /boot/share_folder
3、解压jdk安装文件,命令为:tar -zxvf server-jre-7u25-linux-x64.tar.gz, 解压到当前文件夹
4、配置环境变量,命令:sudo vi /etc/environment ,设置为
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/boot/share_folder/jdk1.7.0_25/bin"
CLASSPATH=.:/boot/share_folder/jdk1.7.0_25/lib
JAVA_HOME=/boot/share_folder/jdk1.7.0_25
5、为了使默认使用的是我们安装的jdk,命令:
update-alternatives --install /usr/bin/java java /boot/share_folder/jdk1.7.0_25/bin/java 300
update-alternatives --install /usr/bin/javac javac /boot/share_folder/jdk1.7.0_25/bin/javac 300
6、最后执行命令:update-alternatives --config java
7、执行命令:java 查看是否成功