【√】安装jdk-linux

 1，下载JDK

http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

查看当前Linux系统是否已经安装java
rpm -qa | grep -i java

2，使用XFTP工具导入linux

 

3，解压到/usr/local/java目录 

创建usr/local/java

Mkdir /usr/local/java

解压

tar -zxvf 压缩包   -C  usr/local/java

配置环境变量之前可以测试

/你的解压目录/bin/java -version

或

到bin目录下 ./java -version

4，配置环境 变量

vi /etc/profile

1.

JAVA_HOME=/usr/local/java/jdk1.8.0_181

PATH=$JAVA_HOME/bin:$PATH

CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

export JAVA_HOME

export PATH

export CLASSPATH

 

2.

JAVA_HOME=/java/jdk1.8.0_161
PATH=$PATH:$JAVA_HOME/bin
export PATH

 

5，刷新环境变量

source /etc/profile

6，测试环境变量

java -version