centOS安装java

centOS安装java

rpm -qa |grep java   # 查看已经安装的java
rpm -e java....     # 删除已经安装的java
rpm -y list java...  # 查看已有的资源
rpm -y install java...  # 安装指定的资源

 然后，这样安装的没有javac啊；

wget http://download.oracle.com/otn-pub/java/jdk/8u181-b13/96a7b8442fe848ef90c96a2fad6ed6d1/jdk-8u181-linux-x64.tar.gz?AuthParam=1535152209_f6c5a52037eea9a4734f0e1b766a0a57

mv jdk-8u181-linux-x64.tar.gz?AuthParam=1535152209_f6c5a52037eea9a4734f0e1b766a0a57  jdk-8u181-linux-x64.tar.gz

tar -xvzf jdk-8u181-linux-x64.tar.gz

 [root@localhost java]#vim /etc/profile
     在最后一行加上如下值
    #java environment
    export JAVA_HOME=/usr/java/jdk1.7.0_80
    export CLASSPATH=.:${JAVA_HOME}/jre/lib/rt.jar:${JAVA_HOME}/lib/dt.jar:${JAVA_HOME}/lib/tools.jar
    export PATH=$PATH:${JAVA_HOME}/bin
     注：CentOS6上面的是JAVAHOME，CentOS7是{JAVA_HOME}