先看有没有java1.8版本的jdk
yum -y list java-1.8*
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安装jdk
yum -y install java-1.8*
查看java安装到哪里了
rpm -qa | grep java
rpm -ql java-1.8.0-openjdk-1.8.0.111-1.b15.el7_2.x86_64
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编辑profile文件
vi /etc/profile
在文件最后追加下面内容
export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.111-1.b15.el7_2.x86_64
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin
使配置即时生效
source /etc/profile
查看是否安装成功
java -version
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