centos 6.5 升级jdk

一、上传rpm

[root@localhost ~]# cd /usr/local/src/
[root@localhost src]# ls
jdk-7u51-linux-x64.rpm
二、查看原有版本
[root@localhost src]# java -version
java version "1.7.0_45"
OpenJDK Runtime Environment (rhel-2.4.3.3.el6-x86_64 u45-b15)
OpenJDK 64-Bit Server VM (build 24.45-b08, mixed mode)
三、查看带有jdk和java的已安装文件
[root@localhost src]# rpm -qa | grep jdk
java-1.7.0-openjdk-1.7.0.45-2.4.3.3.el6.x86_64
java-1.6.0-openjdk-1.6.0.0-1.66.1.13.0.el6.x86_64
[root@localhost src]#
[root@localhost src]# rpm -qa | grep java
java-1.7.0-openjdk-1.7.0.45-2.4.3.3.el6.x86_64
java-1.6.0-openjdk-1.6.0.0-1.66.1.13.0.el6.x86_64
tzdata-java-2013g-1.el6.noarch
[root@localhost src]#
四、强制卸载
[root@localhost src]# rpm -qa | grep jdk | xargs rpm -e --nodeps
[root@localhost src]# rpm -qa | grep java | xargs rpm -e --nodeps
五、安装新版jdk
[root@localhost src]# rpm -ivh jdk-7u51-linux-x64.rpm

Preparing... ########################################### [100%]
1:jdk ########################################### [100%]
Unpacking JAR files...
rt.jar...
jsse.jar...
charsets.jar...
tools.jar...
localedata.jar...
jfxrt.jar...

六、在/etc/profile的末尾追加下面的环境变量

[root@localhost src]# vi /etc/profile

JAVA_HOME=/usr/java/jdk1.7.0_51
JRE_HOME=/usr/java/jdk1.7.0_51/jre
CLASSPATH=$JAVA_HOME/lib:$JAVA_HOME/jre/lib
PATH=$JAVA_HOME/bin:$PATH
export PATH CLASSPATH JAVA_HOME

七、环境变量生效

[root@localhost src]# source /etc/profile

八、查看是否生效

[root@localhost src]# env

九、查看当前jdk版本

[root@localhost src]# java -version
java version "1.7.0_51"
Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)
[root@localhost src]#

问题处理：

如果操作不当导致ls或其他命令无法使用，可执行下面增加环境变量

export PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin