Ubuntu 11.x 12.x how to install java jdk7 online

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1. The method to install java jdk under ubuntu is as follows

Sudo add-apt-repository ppa:eugenesan/javasudo apt-get updatesudo apt-get install oracle-java7-installer

However, the following errors are often encountered in the execution of the third command

Sha256sum mismatch jdk-7u3-linux-x64.tar.gz

And prompt

Java was not installed

2. Download the deb version of jdk under ubuntu at http://www.oracle.com/technetwork/java/javase/downloads/index.html

Copy the deb installation package to the / var/cache/oracle-java7-installer/ directory

Execute the following command to edit the online installation script for jdk

Sudo gedit / var/lib/dpkg/info/oracle-java7-installer.postinst

Find the following paragraph

Echo "Downloading..." Rm-f $FILENAME WGETRC=wgetrc wget $PARTNER_URL | | fp_exit_with_error "download failed" rm-f wgetrc echo "Download done."

Modify to

Echo "Downloading..." # rm-f $FILENAME # WGETRC=wgetrc wget $PARTNER_URL # | fp_exit_with_error "download failed" # rm-f wgetrc echo "Download done."

Save.

4. Finally, execute the following command again

Sudo apt-get install oracle-java7-installer

Now you can install it smoothly.

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