1. 配置新JDK路径
vi /etc/profile添加export JAVA_HOME=/opt/java/jdkexport JRE_HOME=/opt/java/jdk/jreexport PATH=$PATH:$JAVA_HOME/binexport CLASSPATH=$JAVA_HOME/lib
2.使JDK配置生效
source /etc/profile
3.查看JAVA版本,此时JDK版本为1.5,而实际安装的是JDK1.6版本
[root@localhost ~]# java -versionjava version "1.5.0"gij (GNU libgcj) version 4.4.7 20120313 (Red Hat 4.4.7-4)Copyright (C) 2007 Free Software Foundation, Inc.This is free software; see the source for copying conditions. There is NOwarranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
4.查看java路径
[root@localhost ~]# which java/usr/bin/java
5.基本可以判断安装了默认的jdk环境
[root@localhost ~]# rpm -qa|grep javajava_cup-0.10k-5.el6.x86_64gcc-java-4.4.7-4.el6.x86_64java-1.5.0-gcj-1.5.0.0-29.1.el6.x86_64
6.卸载默认jdk
[root@localhost ~]# yum remove javaLoaded plugins: fastestmirrorSetting up Remove ProcessResolving Dependencies
7.再次获取JAVA信息,卸载完JAVA后,需要执行source /etc/profile 使环境变量生效。
[root@localhost ~]# java -version-bash: /usr/bin/java: No such file or directory[root@localhost ~]# source /etc/profile[root@localhost ~]# java -versionjava version "1.6.0_43"Java(TM) SE Runtime Environment (build 1.6.0_43-b01)Java HotSpot(TM) 64-Bit Server VM (build 20.14-b01, mixed mode)
至此,JAVA环境更新完成,此时的JDK版本为1.6.0_43
联系客服