Linux环境JDK安装配置

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1.先御载linux系统自带的openjdk
[iyunv@localhost ~]# rpm -qa |grep java
java-1.6.0-openjdk-1.6.0.0-1.50.1.11.5.el6_3.x86_64
tzdata-java-2012j-1.el6.noarch
java-1.7.0-openjdk-1.7.0.9-2.3.4.1.el6_3.x86_64
[iyunv@localhost ~]# yum -y remove java* tzdata-java

2.解压、安装、配置
# tar -zxvf jdk-7u79-linux-x64.tar
# mv jdk1.7.0_79/ /usr/local/jdk7  //将解压后的目录移动到/usr/local下，并改名为jdk7

设置jdk的环境变量:在最后添加如下语句
# vi /etc/profile
JAVA_HOME=/usr/local/jdk7
JRE_HOME=/usr/local/jdk7/jre
PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH
CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
export JAVA_HOME JRE_HOME PATH CLASSPATH

使环境变量立即生效
# source /etc/profile

检验是否安装成功
# java            #检测jdk bin环境
# javac            #检测jdk classpath环境
# java -version      #查看版本
成功，你会看到如下java命令参数使用说明界面

[iyunv@localhost ~]# java
Usage: java [-options] class [args...]
           (to execute a class)
   or  java [-options] -jar jarfile [args...]
           (to execute a jar file)
where options include:
    -d32          use a 32-bit data model if available
    -d64          use a 64-bit data model if available
    -server          to select the "server" VM
                  The default VM is server.

[iyunv@localhost ~]# javac
Usage: javac <options> <source files>
where possible options include:
  -g                         Generate all debugging info
  -g:none                    Generate no debugging info
  -g:{lines,vars,source}     Generate only some debugging info
  -nowarn                    Generate no warnings

[iyunv@localhost ~]# java -version     查看版本
java version "1.7.0_79"
Java(TM) SE Runtime Environment (build 1.7.0_79-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode)


3.报错解决
1）错误：bash: /usr/local/jdk7/bin/java: /lib/ld-linux.so.2: bad ELF interpreter

没有那个文件或目录是因为64位系统中安装了32位程序
解决方法：yum install glibc.i686


2）报错
[iyunv@localhost ~]# java -version
-bash: /usr/bin/java: /lib/ld-linux.so.2: bad ELF interpreter: No such file or directory

[iyunv@localhost ~]# yum install ld-linux.so.2 -y    //安装ld-linux.so.2包