centos7 jdk 多版本

1.准备工作下载JDK

2. java -version

[robin@localhost ~]$ java -version
java version "1.7.0_75"
OpenJDK Runtime Environment (rhel-2.5.4.7.el7_1-x86_64 u75-b13)
OpenJDK 64-Bit Server VM (build 24.75-b04, mixed mode)

3.安装

rpm -ivh jdk-7u76-linux-x64.rpm

4.配置jdk

vi /etc/profile

export JAVA_HOME=/usr/java/jdk1.7.0_76
export JRE_HOME=$JAVA_HOME/jre
export PATH=$PATH:$JAVA_HOME/bin
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

保存并退出VI编辑器，执行 source /etc/profile 命令，使改动生效

5.多版本设置

alternatives --install /usr/bin/java java /usr/java/jdk1.7.0_76/bin/java 600

alternatives --install /usr/bin/java javac /usr/java/jdk1.7.0_76/bin/javac 600

alternatives --config java

6.检查

#java -version
java version "1.7.0_76"
Java(TM) SE Runtime Environment (build 1.7.0_76-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.76-b04, mixed mode)

卸载系统默认jdk：

1、查找

　　rpm -qa|grep java

2、卸载

　　yum remove -y java-*.*-gcj