1. 上傳jdk7 和 jdk8 包
2. 解壓
[root@localhost webapps]# tar -zxvf /package/jdk-7u80-linux-x64.tar.gz
3. 配置jdk變量
vi /etc/profile
export JAVA_HOME=/package/jdk1.7.0_80
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin
4. java -version
5. 給jdk1.7設(shè)置序列號
[xxx@localhost home]$ alternatives --install /usr/bin/java java /package/jdk1.7.0_80 3
6. 安裝jdk1.8
[xxx@localhost home]$ alternatives --install /usr/bin/java java /package/jdk1.8.0_124 2
7.選擇jdk對應(yīng)的數(shù)字--切換jdk版本
[root@localhost ~]# java -version
java version "1.7.0_80"
Java(TM) SE Runtime Environment (build 1.7.0_80-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.80-b11, mixed mode)
[root@localhost ~]# alternatives --config java
There are 3 programs which provide 'java'.
? Selection? ? Command
-----------------------------------------------
*? 1? ? ? ? ? /package/jdk1.8.0_121/java
? ? ? ? ? /package/jdk1.8.0_121/bin/java
+ 3? ? ? ? ? /package/jdk1.7.0_80/bin/java
Enter to keep the current selection[+], or type selection number: 2
[root@localhost ~]# java -version
java version "1.8.0_121"
Java(TM) SE Runtime Environment (build 1.8.0_121-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.121-b13, mixed mode)
