大數據新手之路一：安裝JDK

Ubuntu16.04

 

1.下載jdk-8u192-linux-x64.tar.gz

https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

 

2.解壓到/usr/local/java文件夾中

 

3.設置配置文件/etc/profile文件，增長java的路徑

①vi /etc/profile

export JAVA_HOME=/usr/local/java export PATH=$PATH:$JAVA_HOME/bin export CLASSPATH=$JAVA_HOME/lib

②讓配置文件當即生效

source /etc/profile

③若是想在當前用戶環境下永久生效，能夠在~/.bashrc中加入source /etc/profile

 

4.檢查java環境是否生效

java -version

 

以上，JDK安裝完畢。

 

PS：

1.JDK/SERVER JRE/JRE的區別（JDK：包含了jre。java開發者使用，用於java程序的編譯等；Server JRE：用於服務端，包括JVM監視器等，不包括瀏覽器集成插件；JRE：覆蓋了大部分終端需求，能夠理解爲用於客戶端；java程序的運行環境。）

• Software Developers: JDK (Java SE Development Kit). For Java Developers. Includes a complete JRE plus tools for developing, debugging, and monitoring Java applications.
• Administrators running applications on a server:  Server JRE (Server Java Runtime Environment) For deploying Java applications on servers. Includes tools for JVM monitoring and tools commonly required for server applications, but does not include browser integration (the Java plug-in), auto-update, nor an installer. Learn more 
• End user running Java on a desktop: JRE: (Java Runtime Environment). Covers most end-users needs. Contains everything required to run Java applications on your system.

 

2.J2SE/J2EE/J2ME

SE:Standard Edition

EE:Enterprise Edition

ME:Micro Edition