在ubuntu 上 安装 sun java7 jdk

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




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