jdk 下载地址 http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
先确定自己服务是32位还是64位
getconf LONG_BIT
找到适合自己机器的 jdk 版本，但是直接使用wget下载会提示
To connect to edelivery.oracle.com insecurely, use
--no-check-certificate.
实际需要更多的参数，因为需要同意授权，所以使用如下完整命令才行
wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/8u131-b11/d54c1d3a095b4ff2b6607d096fa80163/jdk-8u131-linux-x64.rpm"
然后把文件移动到/opt目录运行命令chmod 755 jdk-8u131-linux-x64.rpm，然后运行rpm -i jdk-8u131-linux-x64.rpm
[root@VM_132_97_centos opt]# rpm -i jdk-8u131-linux-x64.rpm Unpacking JAR files... tools.jar... plugin.jar... javaws.jar... deploy.jar... rt.jar... jsse.jar... charsets.jar... localedata.jar... jfxrt.jar... [root@VM_132_97_centos opt]# java -version java version "1.8.0_65" Java(TM) SE Runtime Environment (build 1.8.0_65-b17) Java HotSpot(TM) Server VM (build 25.65-b01, mixed mode)
最后添加环境变量vim /etc/profile，追加如下内容
export JAVA_HOME=/usr/java/jdk1.8.0_65/ export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar export PATH=$PATH:$JAVA_HOME/bin
