Linux配置Java环境

jdk下载地址

http://www.oracle.com/technetwork/java/javase/downloads/

文件jdk-8u161-linux-x64.tar.gz

检查是否已经安装jdk

rpm -qa | grep java

删除系统预装jdk

rpm -e --nodeps `rpm -qa | grep java`

上传到linux服务器目录/opt/jdk

解压jdk压缩文件到文件夹jdk1.8.0_144

tar -zxvf jdk-8u144-linux-x64.tar.gz

配置环境变量

打开/etc/profile文件

vi /etc/profile

在文件末尾插入如下内容

export JAVA_HOME=/opt/jdk1.8.0_144
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH

执行profile

source /etc/profile

检查jdk是否生效

java -version

成功

java version "1.8.0_144"
Java(TM) SE Runtime Environment (build 1.8.0_144-b01)
Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode)

失败

Unrecognized option: -versin
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

可能原因jdk目录配置错误