1.下载JAVA JDK
我这下载的jdk版本是 jdk-8u131-linux-x64.rpm
2. 下载完后将安装文件移到或copy到/usr/java/ 下
eg：mv jdk-8u131-linux-x64.rpm /usr/java

[huangyan@bogon Downloads]$ ls jdk-8u131-linux-x64.rpm jdk-8u131-linux-x64.tar.gz [huangyan@bogon Downloads]$ cp jdk-8u131-linux-x64.rpm /usr/java/ cp: cannot create regular file ‘
/usr/java/jdk-8u131-linux-x64.rpm’
: Permission denied [huangyan@bogon Downloads]$ su root Password: [root@bogon Downloads]# cp jdk-8u131-linux-x64.rpm /usr/java/

[root@bogon java]# ls jdk-8u131-linux-x64.rpm[root@bogon java]# chmod +x jdk-8u131-linux-x64.rpm [root@bogon java]# rpm -ivh jdk-8u131-linux-x64.rpm Preparing... ################################# [100%]Updating / installing... 1:jdk1.8.0_131-2000:1.8.0_131-fcs ################################# [100%]Unpacking JAR files... tools.jar... plugin.jar... javaws.jar... deploy.jar... rt.jar... jsse.jar... charsets.jar... localedata.jar...[root@bogon java]# lsdefault jdk1.8.0_131 jdk-8u131-linux-x64.rpm latest

export JAVA_HOME=/usr/java/jdk1.8.0_131export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jarexport PATH=$PATH:$JAVA_HOME/bin

以上上内容后：
[root@bogon java]# source /etc/profile
[root@bogon java]# java -version
openjdk version “1.8.0_65”

5.发现在还是以前的版本，解决办法

export JAVA_HOME=/usr/java/jdk1.8.0_131export JAVA_BIN=/usr/java/jdk1.8.0_131export PATH=$JAVA_HOME/bin:$PATHexport CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jarexport JAVA_HOME JAVA_BIN PATH CLASSPATH

将前面的加上的改成以上就ok了

[root@bogon java]# java -versionjava version "1.8.0_131"Java(TM) SE Runtime Environment (build 1.8.0_131-b11)Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)[root@bogon java]# echo $PATH/usr/java/jdk1.8.0_131/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin:/home/huangyan/.local/bin:/home/huangyan/bin:/bin:/bin:/usr/java/jdk1.8.0_131/bin[root@bogon java]#