1、首先下载对应系统版本的JDK
下载地址:
http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html
2、解压
sudo mkdir /usr/lib/jvm
sudo tar zxvf jdk-7u60-linux-x64.tar.gz -C /usr/lib/jvm
cd /usr/lib/jvm
sudo mv jdk1.7.0 java
3、修改全局环境变量
sudo vim /etc/profile
export JAVA_HOME=/usr/lib/jvm/java
export JRE_HOME={JAVA_HOME}/jre
export CLASSPATH=.:{JAVA_HOME}/lib:{JRE_HOME}/lib
export PATH={JAVA_HOME}/bin:$PATH
4、ubuntu系统中需要修改默认JDK版本
sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/java/bin/java 300
sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/java/bin/javac 300
sudo update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/java/bin/jar 300
sudo update-alternatives --install /usr/bin/javah javah /usr/lib/jvm/java/bin/javah 300
sudo update-alternatives --install /usr/bin/javap javap /usr/lib/jvm/java/bin/javap 300
sudo update-alternatives --config java
5、测试
# java -version
java version "1.7.0_60"
Java(TM) SE Runtime Environment (build 1.7.0_60-b19)
Java HotSpot(TM) 64-Bit Server VM (build 24.60-b09, mixed mode)
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