linux_install jdk

via: http://my.oschina.net/acmfly/blog/88476

Install the JDK

• Download he 32bit or 64bit Linux "compressed binary file" - it has a ".tar.gz" file extension i.e. "[java-version]-i586.tar.gz" for 32bit and "[java-version]-x64.tar.gz" for 64bit

• Uncompress it

  tar -xvf jdk-7u2-linux-i586.tar.gz (32bit)

  tar -xvf jdk-7u2-linux-x64.tar.gz (64bit)

JDK 7 package is extracted into ./jdk1.7.0_02 directory. - Now move the JDK 7 directory to /usr/lib

sudo mv ./jdk1.7.0_02 /usr/lib/jvm/jdk1.7.0

• Now run

sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.7.0/bin/java" 1
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdk1.7.0/bin/javac" 1
sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/lib/jvm/jdk1.7.0/bin/javaws" 1

• Run

sudo update-alternatives --config java

You will see output similar one below - choose the number of jdk1.7.0 - for example 3 in this list:

$sudo update-alternatives --config java
There are 3 choices for the alternative java (providing /usr/bin/java).

Selection Path Priority Status
————————————————————
* 0 /usr/lib/jvm/java-6-openjdk/jre/bin/java 1061 auto mode
1 /usr/lib/jvm/java-6-openjdk/jre/bin/java 1061 manual mode
2 /usr/lib/jvm/java-6-sun/jre/bin/java 63 manual mode
3 /usr/lib/jvm/jdk1.7.0/jre/bin/java 3 manual mode

Press enter to keep the current choice[*], or type selection number: 3
update-alternatives: using /usr/lib/jvm/jdk1.7.0/jre/bin/java to provide /usr/bin/java (java) in manual mode. 

Check the version of you new JDK 7 installation:

java -version

java version “1.7.0”
Java(TM) SE Runtime Environment (build 1.7.0-b147)
Java HotSpot(TM) Client VM (build 21.0-b17, mixed mode) 

Repeat the above for:

sudo update-alternatives --config javac
sudo update-alternatives --config javaws 

Enable mozilla firefox plugin:

32 bit:
ln -s /usr/lib/jvm/jdk1.7.0/jre/lib/i386/libnpjp2.so ~/.mozilla/plugins/

64 bit:
ln -s /usr/lib/jvm/jdk1.7.0/jre/lib/amd64/libnpjp2.so ~/.mozilla/plugins/ 

Depending on your configuration, you might need to update the apparmor profile for firefox (or other browsers) in /etc/apparmor.d/abstractions/ubuntu-browsers.d/java

# Replace the two lines:
#  /usr/lib/jvm/java-*-sun-1.*/jre/bin/java{,_vm} cx -> browser_java,
#  /usr/lib/jvm/java-*-sun-1.*/jre/lib/*/libnp*.so cx -> browser_java,
# with those (or adapt to your new jdk folder name)
/usr/lib/jvm/jdk*/jre/bin/java{,_vm} cx -> browser_java,
/usr/lib/jvm/jdk*/jre/lib/*/libnp*.so cx -> browser_java, 

Then restart apparmor:

sudo /etc/init.d/apparmor restart 

Confirm that the JRE has been successful by using the official oracle website.

 

接下来需要设置环境变量，进入当前用户名的主文件夹，修改.profile文件。注意，该文件是当前用户的配置文件，如果要对使用计算机的所有用户生效，那么需要设置的文件应该是 /etc/profile。
    sudo gedit ~/.profile
在末尾加上:
    export JAVA_HOME=/usr/lib/jvm/jdk1.7.0
    export JRE_HOME=/usr/lib/jvm/jdk1.7.0/jre
    export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib:$JAVA_HOME/jre/lib:$CLASSPATH

    export PATH=$JAVA_HOME/bin:$PATH
然后保存关闭，此时在命令行输入java -version将会仍然显示java没有安装。此时，需要使用source更新下.profile文件：
    $ source ~/.profile
再次使用java -version命令可以看到如下输出：
    xxx@xxx:~$ java -version
    java version "1.7.0_02"
    Java(TM) SE Runtime Environment (build 1.7.0_02)
    Java HotSpot(TM) 64-Bit Server VM (build 23.6-b04, mixed mode)
到此，已经将oracle jdk配置完成。