1. 打開官網下載Java安裝文件

jdk-7u15-linux-x64.tar.gz

?2.打開終端，根據個人習慣建立目錄

sudo mkdir /usr/local/development

?3.將下載的文件移動到這個文件夾下面并進行解壓。使用如下命令：

sudo mv jdk-7u15-linux-x64.tar.gz /usr/local/development sudo tar -zxvf jdk-7u15-linux-x64.tar.gz

?4.修改環境變量

sudo gedit /etc/environment

?源文件的內容是這樣的：

PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games"

?修改為：

PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:${JAVA_HOME}/bin" JAVA_HOME=/usr/local/development/jdk1.7.0_15 JRE_HOME=${JAVA_HOME}/jre CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/jre/lib"

?5.重新加載bashrc

source ~/.bashrc

?6.配置默認JDK

sudo update-alternatives --install /usr/bin/java java /usr/local/development/jdk1.7.0_15/bin/java 300 sudo update-alternatives --install /usr/bin/javac javac /usr/local/development/jdk1.7.0_15/bin/javac 300 sudo update-alternatives --install /usr/bin/jar jar /usr/local/development/jdk1.7.0_15/bin/jar 300 sudo update-alternatives --install /usr/bin/javap javap /usr/local/development/jdk1.7.0_15/bin/javap 300 sudo update-alternatives --install /usr/bin/javadoc javadoc /usr/local/development/jdk1.7.0_15/bin/javadoc 300

7.設置默認JDK

sudo update-alternatives --config java sudo update-alternatives --config javac

?8.測試：

java -version

?如下顯示表示配置成功：

arlen@Arlen-TOP2:~$ java -version java version "1.7.0_15" Java(TM) SE Runtime Environment (build 1.7.0_15-b03) Java HotSpot(TM) 64-Bit Server VM (build 23.7-b01, mixed mode) arlen@Arlen-TOP2:~$

?P.S:卸載OpenJDK(CentOS)

[arlen@Arlen-CentOS ~]$ rpm -qa | grep java tzdata-java-2012j-1.el6.noarch java-1.6.0-openjdk-1.6.0.0-1.50.1.11.5.el6_3.x86_64 java-1.7.0-openjdk-1.7.0.9-2.3.4.1.el6_3.x86_64 [arlen@Arlen-CentOS ~]$ su 密碼： [root@Arlen-CentOS arlen]# sudo rpm -e --nodeps java-1.6.0-openjdk-1.6.0.0-1.50.1.11.5.el6_3.x86_64 [root@Arlen-CentOS arlen]# sudo rpm -e --nodeps java-1.7.0-openjdk-1.7.0.9-2.3.4.1.el6_3.x86_64 [root@Arlen-CentOS arlen]# java bash: java: command not found [root@Arlen-CentOS arlen]#

?

轉載于:https://www.cnblogs.com/zhangtingkuo/archive/2013/03/09/2951475.html

總結

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