1.http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html 下载JDK
2.解压JDK sudo tar -zxvf jdk-8u121-linux-x64.tar.gz
3.移动到目录 mv jdk1.8.0_121 /usr/java/ (若没有该目录请先创建目录 mkdir /usr/java)
4.修改 .bashrc文件 cd /home/teemo(username) vi .bashrc (vi使用方法http://www.cnblogs.com/emanlee/archive/2011/11/10/2243930.html)
5.#set oracle jdk environment
export JAVA_HOME=/usr/lib/jvm/jdk1.7.0_60 ## 这里要注意目录要换成自己解压的jdk 目录 export JRE_HOME=${JAVA_HOME}/jre export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib export PATH=${JAVA_HOME}/bin:$PATH 6.source ~/.bashrc 7.sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.7.0_60/bin/java 300 sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.7.0_60/bin/javac 300 sudo update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/jdk1.7.0_60/bin/jar 300 sudo update-alternatives --install /usr/bin/javah javah /usr/lib/jvm/jdk1.7.0_60/bin/javah 300 sudo update-alternatives --install /usr/bin/javap javap /usr/lib/jvm/jdk1.7.0_60/bin/javap 300 8.sudo update-alternatives --config java若是初次安装jdk,会有下面的提示
There is only one alternative in link group java (providing /usr/bin/java): /usr/lib/jvm/jdk1.7.0_60/bin/java
否者,选择合适的jdk
9..测试jdk
java -version