Quick and dirty linux command line scripts to download and update java. It might not fit to your environment. Enhance and adapt it if you like, but use it on your own risk!

download-java

# pass url of a java *.tar.gz file as the first and only parmeter

url=$1
tmp=.temporary-java-download

function confirm () {
  echo $1
  select yn in "Yes" "No"; do
    case $yn in
        Yes ) return 1; break;;
        No ) return 0; exit;;
    esac
  done
}


mkdir $tmp
cd $tmp

confirm "Download Java from $url?"
if [ $? -eq 1 ]
then
  wget --no-cookies --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com" $1
  filename=$(basename $1)
  echo "Downloaded file $filename"
  confirm "Untar file $filename?"
  if [ $? -eq 1 ]
  then
    tar -xvvf $filename
    rm $filename
    javaFolder=$(find . -mindepth 1 -maxdepth 1 -type d)
    confirm "Update to java $javaFolder?"
    if [ $? -eq 1 ]
    then
      ./../update-java $javaFolder
    fi
  fi
fi


# cleanup
cd ..
confirm "Delete temporary files?"
if [ $? -eq 1 ]
then
  rm -R $tmp
fi

update-java

# JDK Folder must be placed in the same dir as this script.
# Folder name has to be passed in as the first and only parameter

cp -R $1 /usr/lib/jvm/
echo "removing old symlink /usr/lib/jvm/java-7-sun"
rm /usr/lib/jvm/java-7-sun
echo "linking /usr/lib/jvm/java-7-sun to /usr/lib/jvm/$1"
ln -s /usr/lib/jvm/$1 /usr/lib/jvm/java-7-sun
echo "DONE"
java -version