在CentOS 6.3中安装与配置JDK-7
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系统环境：centos-6.3<br>
安装方式：rpm安装<br>
软件：jdk-7-linux-x64.rpm<br>
下载地址：http://www.oracle.com/technetwork/java/javase/downloads/java-se-jdk-7-download-432154.html</p>
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<strong>检验系统原版本</strong><br>
# java -version<br>
java version "1.6.0_24"<br>
OpenJDK Runtime Environment (IcedTea6 1.11.1) (rhel-1.45.1.11.1.el6-x86_64)<br>
OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)</p>
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进一步查看JDK信息：<br>
# rpm -qa | grep java<br>
tzdata-java-2012c-1.el6.noarch<br>
java-1.6.0-openjdk-1.6.0.0-1.45.1.11.1.el6.x86_64</p>
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卸载OpenJDK，执行以下操作：<br>
# rpm -e --nodeps tzdata-java-2012c-1.el6.noarch<br>
# rpm -e --nodeps java-1.6.0-openjdk-1.6.0.0-1.45.1.11.1.el6.x86_64</p>
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<strong>安装JDK</strong></p>
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上传新的jdk-7-linux-x64.rpm软件到/usr/local/执行以下操作：<br>
# rpm -ivh jdk-7-linux-x64.rpm</p>
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JDK默认安装在/usr/java中。</p>
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<strong>验证安装</strong></p>
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执行以下操作，查看信息是否正常：<br>
# java<br>
# javac<br>
# java -version<br>
java version "1.7.0"<br>
Java(TM) SE Runtime Environment (build 1.7.0-b147)<br>
Java HotSpot(TM) 64-Bit Server VM (build 21.0-b17, mixed mode)</p>
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<strong>配置环境变量</strong></p>
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我的机器安装完jdk-7-linux-x64.rpm后不用配置环境变量也可以正常执行javac、java –version操作，因此我没有进行JDK环境变量的配置。但是为了以后的不适之需，这里还是记录一下怎么进行配置，操作如下：<br>
修改系统环境变量文件<br>
vi + /etc/profile</p>
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向文件里面追加以下内容：<br>
JAVA_HOME=/usr/java/jdk1.7.0<br>
JRE_HOME=/usr/java/jdk1.7.0/jre<br>
PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin<br>
CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib<br>
export JAVA_HOME JRE_HOME PATH CLASSPATH</p>
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<strong>使修改生效</strong><br>
# source /etc/profile //使修改立即生效<br>
# echo $PATH //查看PATH值</p>
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<strong>查看系统环境状态</strong><br>
# echo $PATH<br>
/usr/local/cmake/bin:/usr/lib64/qt-3.3/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/java/jdk1.7.0/bin:/usr/java/jdk1.7.0/jre/bin:/root/bin</p>
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