1、官网下载jdk1.7 linux版本jdk-7u21-linux-x64.tar.gz
2、复制到指定目录,我这里是放在home/smile/tools里
3、解压包:
4 、添加到环境变量,打开/etc/profile文件:
5、添加变量:
# /etc/profile这个文件是每个用户登录时都会运行的环境变量设置 # JAVA_HOME目录 export JAVA_HOME=/home/smile/tools/jdk1.7.0_21 # JRE_HOME目录 export JRE_HOME=/home/smile/tools/jdk1.7.0_21/jre # 添加到CLASSPATH环境变量下 export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH # 添加到PATH环境变量下 export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$JAVA_HOME:$PATH
6、查看:
7、最后修改系统默认JDK,并使之立马生效(安装Myeclipse必须修改这里,否则报错)
sudo update-alternatives --install "/usr/bin/java" "java" "/home/smile/tools/jdk1.7.0_21/bin/java" 300 sudo update-alternatives --install "/usr/bin/javac" "javac" "/home/smile/tools/jdk1.7.0_21/bin/javac" 300 sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/home/smile/tools/jdk1.7.0_21/bin/javaws" 300 sudo update-alternatives --config java sudo update-alternatives --config javac sudo update-alternatives --config javaws