linux 安装jdk

第一步，下载JDK
到 Oracle 官网下载jdk-6u45-linux-i586.bin
http://www.oracle.com/technetwork/java/javasebusiness/downloads/java-archive-downloads-javase6-419409.html


第二步，解压安装

chmod 755 jdk-6u43-linux-i586.bin

./[b]jdk-6u43-linux-i586.bin[/b](注意，这个步骤一定要在jdk-6u11-linux-i586.bin所在目录下） 自解压

把解压好的文件放到你想安装的目录下面（我这是 /usr/lib/jvm/java下 放jdk1.6.0_45）

第三步，修改环境变量

gedit /etc/environment


修改(增加)：

[java]
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PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games"
J***A_HOME=/usr/lib/jvm/java/jdk1.6.0_45

JRE_HOME=${J***A_HOME}/jre
CLASSPATH=.:${J***A_HOME}/lib:${JRE_HOME}/lib

PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games"
J***A_HOME=/usr/lib/jvm/java/jdk1.6.0_43
JRE_HOME=${J***A_HOME}/jre  
CLASSPATH=.:${J***A_HOME}/lib:${JRE_HOME}/lib

然后重新加载.bashrc

[java]
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source ~/.bashrc

source ~/.bashrc

第四步，修改默认配置项

[java]
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sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/java/jdk1.6.0_45/bin/java 300
sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/java/jdk1.6.0_45/bin/javac 300
sudo update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/java/jdk1.6.0_45/bin/jar 300
sudo update-alternatives --install /usr/bin/javah javah /usr/lib/jvm/java/jdk1.6.0_45/bin/javah 300
sudo update-alternatives --install /usr/bin/javap javap /usr/lib/jvm/java/jdk1.6.0_45/bin/javap 300

sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/java/jdk1.6.0_43/bin/java 300
sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/java/jdk1.6.0_43/bin/javac 300
sudo update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/java/jdk1.6.0_43/bin/jar 300
sudo update-alternatives --install /usr/bin/javah javah /usr/lib/jvm/java/jdk1.6.0_43/bin/javah 300
sudo update-alternatives --install /usr/bin/javap javap /usr/lib/jvm/java/jdk1.6.0_43/bin/javap 300

--这个不加的话最后用java -version检测出来的还是OpenJ***A。

sudo update-alternatives --config java

第五步，测试一下

[java]
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without@without-pc:~/Downloads$ java -version
java version "1.6.0_45"
Java(TM) SE Runtime Environment (build 1.6.0_45-b01)
Java HotSpot(TM) Server VM (build 20.14-b01, mixed mode)
http://blog.csdn.net/without0815/article/details/8686755