Ubuntu 14 Configuration JDK

1. Download the JDK

Http://www.oracle.com/technetwork/cn/java/javase/downloads/index.html

Save address after download:/home/root1/downloads/jdk-8u20-linux-x64.tar.gz

2. Unzip the file,

/home/root1/downloads/jdk-8u20-linux-x64.tar.gz

The zipzip is probably the most used document compression format today. Its greatest advantage is in the use of different operating system platforms, such as Linux, Windows and Mac OS. The downside is that the compression ratios are not very high, and tar.gz and TAR.GZ2 are doing very well in terms of compression. Gossip less, let's get to the point: we can use the following command to compress a directory: # zip-r Archive_name.zip directory_to_compress The following is if you unzip a zip document: # unzip Archive_ Name.ziptartar is a very extensive document packaging format used in Linux. The advantage is that it consumes very little CPU and time to package files, he is just a packaging tool, not responsible for compression. Here's how to package a directory: # TAR-CVF Archive_name.tar directory_to_compress How to unpack: # TAR-XVF Archive_ name.tar.gz above this unpacking command will unlock the document under the current directory. Of course, you can also use this command to squeeze the path of unpacking: # TAR-XVF archive_name.tar-c/tmp/extract_here/tar. GZ This format is the compression format that I use most. It does not take up too much CPU when compressing, and it can get a very ideal compression rate. Use this format to compress a directory: # TAR-ZCVF archive_name.tar.gz directory_to_compress extract: # TAR-ZXVF Archive_ name.tar.gz above this unpacking command will unlock the document under the current directory. Of course, you can also use this command to squeeze the path of unpacking: # TAR-ZXVF archive_name.tar.gz-c/tmp/extract_here/tar. BZ2 This compression format is the best compression rate in all of the ways we mentioned. This, of course, means that it consumes more CPU and time than the previous way. This is how you use tar.bz2 for compression. # TAR-JCVF archive_name.tar.bz2 directory_to_compress The above unpacking command will unlock the document under the current directory. Of course, you can also use this command to squeeze the path of unpacking: # TAR-JXVF Archive_name.tar.bz2-c/tmp/extract_here/

3. Place the extracted folder in a location that you want to save, similar to Windows program and files, but Linux requires you to choose the path yourself, copy the files in the past, of course, can also be installed directly, if there is an installation package. After I download the address:/home/root1/downloads/jdk-8u20-linux-x64.tar.gz
, put it in the/USR/LIB/JVM path

4. Add Ubuntu Environment variables

　　

Add the following code:

Export java_home=/usr/lib/jvm/jdk-8u20-linux-x64

Export JRE_HOME=${JAVA_HOME}/JRE

Export Classpath=.:${java_home}/lib:${jre_home}/lib

Export Path=${java_home}/bin: $PATH

To any one of the 2 files

　1)/etc/profile setting method is valid for all login users

$sudo Gedit/etc/profile

Or

2) ~/.BASHRC only valid for current user

$sudo gedit ~/.BASHRC

5. Making the changes effective

SOURCE ~/.profile

Or

SOURCE ~/.BASHRC

6. Test the JDK

Command: Java-version

Reference:

1. http://jingyan.baidu.com/article/c33e3f48a3365dea15cbb5c9.html

and

2. http://www.linuxidc.com/Linux/2014-11/109216.htm

Ubuntu 14 Configuration JDK