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Ubuntu14.04 LTS下安裝JDK 1.8

先到Oracle官網(wǎng)的下載中心下載JDK8的tar包到本地。

創(chuàng)建應(yīng)用程序主目錄

linuxidc@ubuntu:/usr/lib$ sudo mkdir jvm

解壓下載的tar包到應(yīng)用程序主目錄下

linuxidc@ubuntu:~/Downloads$ sudo tar zxf jdk-8u65-linux-x64.tar.gz -C /usr/lib/jvm

重命名下文件夾

linuxidc@ubuntu:/usr/lib/jvm$ sudo mv jdk1.8.0_65 java

安裝vim（因為UBuntu默認情況下不安裝vim命令，需要用apt-get命令安裝）

linuxidc@ubuntu:/usr/lib/jvm/java$sudoapt-getinstallvim
Readingpackagelists...Done
Buildingdependencytree
Readingstateinformation...Done
Thefollowingextrapackageswillbeinstalled:
vim-runtime
Suggestedpackages:
ctagsvim-docvim-scripts
ThefollowingNEWpackageswillbeinstalled:
vimvim-runtime
0upgraded,2newlyinstalled,0toremoveand6notupgraded.
Needtoget5,844kBofarchives.
Afterthisoperation,28.0MBofadditionaldiskspacewillbeused.
Doyouwanttocontinue?[Y/n]y
Get:1http://us.archive.ubuntu.com/ubuntu/trusty/mainvim-runtimeall2:7.4.052-1ubuntu3[4,888kB]
Get:2http://us.archive.ubuntu.com/ubuntu/trusty/mainvimamd642:7.4.052-1ubuntu3[956kB]
Fetched5,844kBin18min52s(5,159B/s)

配置環(huán)境變量，vim ~/.bashrc文件

linuxidc@ubuntu:/usr/lib/jvm/java$ sudo vim ~/.bashrc

添加下面的內(nèi)容到文件尾部

exportJAVA_HOME=/usr/lib/jvm/java
exportJRE_HOME=${JAVA_HOME}/jre
exportCLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
exportPATH=${JAVA_HOME}/bin:$PATH

如果你的Ubuntu上已經(jīng)安裝了其他版本的JDK，你可以通過update-alternatives命令來設(shè)定比如命令Java的默認命令路徑。然后就是編譯下讓update-alternatives配置生效。

linuxidc@ubuntu:/usr/lib/jvm/java$sudoupdate-alternatives--install/usr/bin/javajava/usr/lib/jvm/java/bin/java300
update-alternatives:using/usr/lib/jvm/java/bin/javatoprovide/usr/bin/java(java)inautomode
linuxidc@ubuntu:/usr/lib/jvm/java$sudoupdate-alternatives--install/usr/bin/javacjavac/usr/lib/jvm/java/bin/javac300
update-alternatives:using/usr/lib/jvm/java/bin/javactoprovide/usr/bin/javac(javac)inautomode
linuxidc@ubuntu:/usr/lib/jvm/java$sudoupdate-alternatives--install/usr/bin/jarjar/usr/lib/jvm/java/bin/jar300
update-alternatives:using/usr/lib/jvm/java/bin/jartoprovide/usr/bin/jar(jar)inautomode
linuxidc@ubuntu:/usr/lib/jvm/java$sudoupdate-alternatives--install/usr/bin/javahjavah/usr/lib/jvm/java/bin/javah300
update-alternatives:using/usr/lib/jvm/java/bin/javahtoprovide/usr/bin/javah(javah)inautomode
linuxidc@ubuntu:/usr/lib/jvm/java$sudoupdate-alternatives--install/usr/bin/javapjavap/usr/lib/jvm/java/bin/javap300
update-alternatives:using/usr/lib/jvm/java/bin/javaptoprovide/usr/bin/javap(javap)inautomode
linuxidc@ubuntu:/usr/lib/jvm/java$sudoupdate-alternatives--configjava
Thereisonlyonealternativeinlinkgroupjava(providing/usr/bin/java):/usr/lib/jvm/java/bin/java
Nothingtoconfigure.

最后檢查是否安裝成功

linuxidc@ubuntu:/usr/lib/jvm/java$ java -version
java version "1.8.0_65"
Java(TM) SE Runtime Environment (build 1.8.0_65-b17)
Java HotSpot(TM) 64-Bit Server VM (build 25.65-b01, mixed mode)
linuxidc@ubuntu:/usr/lib/jvm/java$

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