Installation JAVA (LINUX)

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Installation JAVA (LINUX)

JDK version 7u80 64 Wei

1. Clean the system comes with default jdk

 如果安装centos6.8时默认安装了某些JDK等，执行rpm -qa|grep jdk 查看已经自带的jdk，然后卸载

 卸载命令： sudo yum remove XXX (XXX为上一个命令查到的结果)

 赋予权限：sudo chmod 777 jdk-7u80-linux-x64.rpm   

Note: to modify permissions, with 777 users, user groups and others three groups were given permission to read and write execution

2. Install

sodu rpm -ivh 777 jdk-7u80-linux-x64.rpm

3. The default path

/usr/java

4.jdk configuration environment variable

1.sudo vim /etc/profile

2.在最下方添加

 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

3.保存退出 :wq

4.使配置生效  source/etc/profile

5. Verify

执行java -version命令，看到有信息 成功