linux下安装jdk1.7

原文地址：http://blog.csdn.net/gxy3509394/article/details/8166288  （感恩原文作者的分享）

最经公司需要在linux上开发、需要在linux系统上面搭建开发环境，倒腾了半个小时算是弄好了jdk的安装，写个博客记下来吧。

首先先检查linux机器上是否有自带的jdk

java -version检查下就可以，如果有版本低的话可以先卸载掉方法如下

[root@localhost java]# rpm -qa|grep gcj 或者 rpm -qa|grep java

libgcj-4.1.2-44.el5

java-1.4.2-gcj-compat-1.4.2.0-40jpp.115

如果没有信息就是没有安装、如果有那么如下操作
[root@localhost jdk-6u13-linux-i586]# yum -y remove java-1.4.2-gcj-compat-1.4.2.0-40jpp.115   或者 rpm
-e --nodeps java-1.4.2-gcj-compat-1.4.2.0-40jpp.115
Loaded plugins: rhnplugin, security
This system is not registered with RHN.
RHN support will be disabled.
Setting up Remove Process
Resolving Dependencies
--> Running transaction check
---> Package java-1.4.2-gcj-compat.i386 0:1.4.2.0-40jpp.115 set to be erased
--> Processing Dependency: java-gcj-compat for package: antlr
--> Processing Dependency: java-gcj-compat for package: antlr
--> Processing Dependency: java-gcj-compat >= 1.0.64 for package: gjdoc
--> Processing Dependency: java-gcj-compat >= 1.0.64 for package: gjdoc
--> Running transaction check
---> Package antlr.i386 0:2.7.6-4jpp.2 set to be erased
---> Package gjdoc.i386 0:0.7.7-12.el5 set to be erased
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
 Package                   Arch     Version                 Repository     Size
================================================================================
Removing:
 java-1.4.2-gcj-compat     i386     1.4.2.0-40jpp.115       installed      441 
Removing for dependencies:
 antlr                     i386     2.7.6-4jpp.2            installed     2.5 M
 gjdoc                     i386     0.7.7-12.el5            installed     1.7 M

Transaction Summary
================================================================================
Install      0 Package(s)         
Update       0 Package(s)         
Remove       3 Package(s)         

Downloading Packages:
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
  Erasing        : antlr                                             [1/3] 
  Erasing        : gjdoc                                             [2/3] 
  Erasing        : java-1.4.2-gcj-compat                             [3/3] 

Removed: java-1.4.2-gcj-compat.i386 0:1.4.2.0-40jpp.115
Dependency Removed: antlr.i386 0:2.7.6-4jpp.2 gjdoc.i386 0:0.7.7-12.el5

Complete!(看到这个说明完成了。。)

接着我们手动安装linux的jdk我的

下载地址

<a target=_blank target="_blank" href="http://www.oracle.com/technetwork/java/javase/downloads/java-se-jdk-7-download-432154.html" style="color: rgb(202, 0, 0); text-decoration: none;">http://www.oracle.com/technetwork/java/javase/downloads/java-se-jdk-7-download-432154.html</a>

我下载的是rpm包

接着执行安装

[root@localhost local]# rpm -ivh jdk-7-linux-i586.rpm

Preparing...                ########################################### [100%]

   1:jdk                    ########################################### [100%]

Unpacking JAR files...

        rt.jar...

        jsse.jar...

        charsets.jar...

        tools.jar...

        localedata.jar...

        plugin.jar...

        javaws.jar...

        deploy.jar...

我的rpm包就这样就装好了。。

接着是配置环境变量

#vi  /etc/profile

在该profile文件中最下面添加：

export JAVA_HOME=/usr/java/jdk1.7.0

export CLASSPATH=.:$JAVA_HOME/jre/lib

export PATH=$JAVA_HOME/bin:$PATH

添加完毕保存退出

source /etc/profile

[root@localhost jdk1.7.0]# java -version
java version "1.7.0"
Java(TM) SE Runtime Environment (build 1.7.0-b147)
Java HotSpot(TM) Client VM (build 21.0-b17, mixed mode, sharing)
[root@localhost jdk1.7.0]# echo $JAVA_HOME

/usr/java/jdk1.7.0

这个时候就大功告成了