1.檢查linux虛擬機器是32位還是64位 ,如果輸出結果中含有X86_64，表明系統是64位的，如果出現i686，證明系統是32位的: uname -a

3.檢視已安裝jdk版本，並將其解除安裝：

[[email protected] ~]# java -version java version "1.7.0_45" OpenJDK Runtime Environment (rhel-2.4.3.3.el6-i386 u45-b15) OpenJDK Client VM (build 24.45-b08, mixed mode, sharing) [[email protected]

~]# [[email protected] ~]# [[email protected] ~]# ps -ef |grep java root      1772  1589  0 06:14 pts/0    00:00:00 grep java [[email protected] ~]# rpm -qa|grep java java-1.6.0-openjdk-1.6.0.0-1.66.1.13.0.el6.i686 java-1.7.0-openjdk-1.7.0.45-2.4.3.3.el6.i686 tzdata-java-2013g-1.el6.noarch [[email protected] ~]# [[email protected] ~]# [[email protected] ~]# yum remove *openjdk* Loaded plugins: fastestmirror, security Setting up Remove Process Resolving Dependencies --> Running transaction check ---> Package java-1.6.0-openjdk.i686 1:1.6.0.0-1.66.1.13.0.el6 will be erased ---> Package java-1.7.0-openjdk.i686 1:1.7.0.45-2.4.3.3.el6 will be erased --> Finished Dependency Resolution  

4.將下載好的jdk上傳到linux，解壓

[[email protected] java]# tar -zxvf jdk-8u191-linux-i586.tar.gz  

5.設定環境變數

[[email protected] java]# vim /etc/profile  

export JAVA_HOME=/usr/local/java/jdk1.8.0_191 export JRE_HOME=${JAVA_HOME}/jre export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib export  PATH=${JAVA_HOME}/bin:$PATH  

6.執行profile檔案

[[email protected] java]# source /etc/profile

7.檢查是否安裝成功

[[email protected] java]# java -version