1. 查看系統安裝的版本情況:
rpm -qa | grep jdk
rpm -qa | grep gcj
2. 查看並刪除
[root@iZ2zeedm3x12d8xb4g15azZ ~]# rpm -qa|grep jdk java-1.6.0-openjdk-devel-1.6.0.0-1.41.1.10.4.5.alios6.x86_64 java-1.6.0-openjdk-1.6.0.0-1.41.1.10.4.5.alios6.x86_64 [root@iZ2zeedm3x12d8xb4g15azZ ~]# rpm -e --nodeps java-1.6.0-openjdk-devel-1.6.0.0-1.41.1.10.4.5.alios6.x86_64 [root@iZ2zeedm3x12d8xb4g15azZ ~]# rpm -e --nodeps java-1.6.0-openjdk-1.6.0.0-1.41.1.10.4.5.alios6.x86_64 [root@iZ2zeedm3x12d8xb4g15azZ ~]# rpm -qa|grep gcj libgcj-4.4.6-3.5.alios6.x86_64 [root@iZ2zeedm3x12d8xb4g15azZ ~]# rpm -e --nodeps libgcj-4.4.6-3.5.alios6.x86_64 [root@iZ2zeedm3x12d8xb4g15azZ ~]# java -bash: /usr/bin/java: No such file or directory
3. 安裝jdk
3.1 下載jdk
jdk7:http://www.oracle.com/technetwork/java/javase/downloads/java-archive-downloads-javase7-521261.html
3.2創建安裝jdk的目錄:
mkdir /usr/local/java
3.3 解壓文件到創建的文件夾下:
tar zxvf jdk-7u79-linux-x64.gz -C /usr/local/java
3.4 在profile文件的末尾加入如下命令:
vim /etc/profile
#JAVA_HOME
export JAVA_HOME=/usr/local/jdk1.7.0_79
export PATH=$PATH:$JAVA_HOME/bin
3.5 刷新環境變量
source /etc/profile
3.6 測試java命令是否可用
java -version
完成