Installation and deployment of JDK1.8 under Linux (centos)

1. Unzip the jdk installation package: 
attach the download address of jdk1.8: 
http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html 
This method is to download jdk in advance installation package, the general format under Linux is *.tar.gz. Then decompress it directly, and configure the environment variables after the decompression is complete.

1. Create a java folder under /usr/local/

 cd /usr/local/                                     进入目录
 mkdir java                                     新建java目录

2. After the folder is created, copy the installation package to the Java directory, and then unzip the jdk to the current directory

cp /usr/jdk-8u60-linux-x64.tar.gz /usr/local/java/    **注意文件名**  拷贝到java目录
tar -zxvf jdk-8u60-linux-x64.tar.gz       解压到当前目录（Java目录）或者tar -zxvf jdk-8u60-linux-x64.tar.gz  /usr/local/jdk1.8     解压到指定目录（jdk1.8目录）

3. After decompression, a jdk1.8.0_60 directory will appear in the Java directory, and the decompression is complete. Then configure the environment variables. 
Edit the profile file under /etc/ and configure environment variables

 vi /etc/profile                  进入profile文件的编辑模式

 在最后边追加一下内容(**配置的时候一定要根据自己的目录情况而定哦！**)

 JAVA_HOME=/usr/local/java/jdk1.8.0_60       
 CLASSPATH=$JAVA_HOME/lib/
 PATH=$PATH:$JAVA_HOME/bin
 export PATH JAVA_HOME CLASSPATH

After saving and exiting the file, enter Java and Java -version in the console to see if there is any information output, as follows: 
Java -version

 java version "1.8.0_60"
 Java(TM) SE Runtime Environment (build 1.8.0_60-b27)
 Java HotSpot(TM) Client VM (build 25.60-b23, mixed mode)

If the above information can be displayed, it means that the jdk installation is successful! 

Note : After changing the environment variables, execute source /etc/profile

source:

https://blog.csdn.net/nxw_tsp/article/details/71110106