在Ubuntu12.10系统安装JDK7

        最近突然想安装一个ubuntu系统来玩玩，想用来开发android游戏，但是安装一个JDK就折腾了我不少时间，官网下载没有DEB格式的安装文件，我又不会编译，痛苦，网上找到一篇文章自动安装的，在这转载下，虽然是英文版的。

        转自http://www.webupd8.org/2012/01/install-oracle-java-jdk-7-in-ubuntu-via.html

       

We've previously written about installing Oracle JDK 7 in Ubuntu using a script with a GUI provided by Zenity. Some may find this method hard to use and also, it comes with GTK dependencies. So as an alternative that doesn't have any GTK dependencies and comes with automatic updates too, I've set up an Ubuntu PPA for the latest Oracle Java 7 (JDK).

If you really need to use Oracle (ex Sun) Java instead of OpenJDK in Ubuntu, here's an easy way to do it:  a PPA repository to install and keep your computer up to date with the latest Oracle Java 7 (Java JDK which includes JRE).

Oracle JDK7 itself is not hosted in the PPA because that's not allowed by the new Java license (which is also the reason why it has been removed from the official Ubuntu repositories);  the package in the PPA automatically downloads (and installs) Oracle Java JDK 7 from its official website and installs it on your computer, just like the flashplugin-installer package does.

Please note that this package is currently in alpha and is offered without any guarantees, so it may or may not work! Use it at your own risk! The package should support proxies just like the flashplugin-installer does, but it may fail if your ISP or router blocks some non-standard ports because Oracle uses quite a few redirects for the Java 7 binary download links. If the download fails because of blocked ports or because you're behind a firewall, use the manual Oracle Java 7 installation method (link in the beginning of the post).

nstall Oracle Java 7 in Ubuntu via PPA

This package provides Oracle Java JDK 7 (which includes Java JDK, JRE and the Java browser plugin). However, you can't only install Oracle JRE - the PPA only provides the full Oracle JDK7 package.

To add our PPA and install the latest Oracle Java 7 in Ubuntu (supports Ubuntu 13.04, 12.10, 12.04, 11.10, 11.04 and 10.04), use the commands below:

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java7-installer

After the installation finishes, if you wish to see if it was successful, you can run the following command:

java -version

It should return something like this:

java version "1.7.0_10"
Java(TM) SE Runtime Environment (build 1.7.0_10-b18)
Java HotSpot(TM) 64-Bit Server VM (build 23.6-b04, mixed mode)

The package installs all the Java binaries, so you can also try "javac -version" which should return "javac 1.7.0_10" and so on (the "_10" part of the version can be different because I'm constantly updating the PPA with the latest Oracle Java 7 version).  The current JDK version in the PPA is Oracle Java 7 Update 10 (7u10).

If for some reason, the Java version in use is not 1.7.0, you can try to run the following command:

sudo update-java-alternatives -s java-7-oracle

Update:  the Oracle Java 7 (JDK & JRE) PPA is now available for Ubuntu 12.10 Quantal Quetzal and  13.04 Raring Ringtail.

Update 2: the installer now requires you accept the Oracle license before the installation begins. This is only required once. If for some reason you

automated, you can run the following command to automatically accept the Oracle license:

sudo echo oracle-java7-installer shared/accepted-oracle-license-v1-1 select true | sudo /usr/bin/debconf-set-selections

Removing Oracle Java 7

If you don't want to use Oracle Java (JDK) 7 anymore and want to go back to OpenJDK, all you have to do is remove the Oracle JDK7 Installer and the previous Java (OpenJDK, etc.) version will be used:

sudo apt-get remove oracle-java7-installer

Update:  for Debian , see:  How To Install Oracle Java 7 In Debian Via Repository

The package is based on Bruce Ingalls' Java Update script and on the flashplugin-installer debian package - thanks!