Linux机器安装java环境

一、下载

cd /usr/local/tools/

jdk-8u144-linux-x64.tar.gz

tar -zxvf jdk-8u144-linux-x64.tar.gz

[root@ct71 tools]# ll
total 181176
drwxr-xr-x. 8 uucp  143      4096 Jul 22  2017 jdk1.8.0_144
-rw-r--r--. 1 root root 185515842 Jan  9  2018 jdk-8u144-linux-x64.tar.gz

二、配置环境变量

[root@java04 jdk1.8.0_144]# java -version
openjdk version "1.8.0_111"
OpenJDK Runtime Environment (build 1.8.0_111-b15)
OpenJDK 64-Bit Server VM (build 25.111-b15, mixed mode)

[root@java04 jdk1.8.0_144]# which java
/usr/bin/java 

因为机器上已存在java环境，需要增加软链接。

[root@java04 bin]# cd /usr/bin/

[root@java04 bin]# ln -s -b /usr/local/tools/jdk1.8.0_144/bin/java java

vi /etc/profile

#jdk环境变量
export JAVA_HOME=/usr/local/tools/jdk1.8.0_144
export PATH=$PATH:$JAVA_HOME/bin

source /etc/profile

三、验证

[root@java04 bin]# java -version
java version "1.8.0_144"
Java(TM) SE Runtime Environment (build 1.8.0_144-b01)
Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode)

[root@java04 tools]# which java
/usr/bin/java

至此，jdk环境配置完成，jps、javac等命令都生效了。