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cent os上安装java

安装openjdk

使用yum安装java-1.8.0-openjdk与java-1.8.0-openjdk-devel:

sudo yum install java-1.8.0-openjdk.x86_64
sudo yum install java-1.8.0-openjdk-devel.x86_64

修改.bash_profile文件设置java_home与classpath

export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.151-5.b12.el7_4.x86_64
export CLASSPATH=.:$JAVA_HOME/lib
PATH=$PATH:$JAVA_HOME/bin


安装java

将java安装文件解压到/opt/local目录下面:

sudo tar -zxvf jdk-8u151-linux-x64.tar.gz -C /opt/local

centos使用alternatives来管理不同版本的java,这里需要把安装的java添加到alternatives中:

sudo alternatives --install /usr/bin/java java /opt/local/jdk1.8.0_151/bin/java 500

修改/etc/profile文件,设置java_home与classpath:

export JAVA_HOME=/opt/local/jdk1.8.0_151
export CLASSPATH=.:$JAVA_HOME/lib
PATH=$PATH:$JAVA_HOME/bin