摘要：
分为下面5个步骤1.官网下载JDK2.检查是否安装jdk，解压缩,放到指定目录3.配置环境变量4.设置系统默认JDK5.测试jdk1.官网下载JDK 地址:http://www.oracle.com/technetwork/articles/javase/index-jsp-138363.html选择相应的.gz包下载2.解压缩,放到指定目录(以jdk-7u80-linux-x64.tar.g
分为下面5个步骤
1.官网下载JDK
2.检查是否安装jdk，解压缩,放到指定目录
3.配置环境变量
4.设置系统默认JDK
5. 测试jdk
1.官网下载JDK
地址:http://www.oracle.com/technetwork/articles/javase/index-jsp-138363.html选择相应的 .gz包下载
2. 解压缩,放到指定目录(以jdk-7u80-linux-x64.tar.gz为例)
1)java -version 检查是否安装了jdk
2)创建目录:
sudo mkdir /usr/lib/jdk加压缩到该目录:
sudo tar -zxvf jdk-7u80-linux-x64.tar.gz -C /usr/lib/jdk3.修改环境变量:
sudo vim ~/.bashrc文件的末尾追加下面内容:
#set oracle jdk environment
export JAVA_HOME=/usr/lib/jdk/jdk1.7.0_80 ## 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
使环境变量马上生效
source ~/.bashrc
4.设置系统默认jdk 版本
sudo update-alternatives --install /usr/bin/java java /usr/lib/jdk/jdk1.7.0_80/bin/java 300
sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jdk/jdk1.7.0_80/bin/javac 300
sudo update-alternatives --install /usr/bin/jar jar /usr/lib/jdk/jdk1.7.0_80/bin/jar 300
sudo update-alternatives --install /usr/bin/javah javah /usr/lib/jdk/jdk1.7.0_80/bin/javah 300
sudo update-alternatives --install /usr/bin/javap javap /usr/lib/jdk/jdk1.7.0_80/bin/javap 300 然后执行:
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_80/bin/java
否者,选择合适的jdk
5.测试jdk
java -version
java version "1.7.0_80"
Java(TM) SE Runtime Environment (build 1.7.0_80-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.80-b11, mixed mode)
jdk 安装成功