Centos7 安装jdk8 和 maven3

centos7 安装jdk

检查是否已装有其他版本的JDK，执行命令：rpm -qa | grep java，
如上所示，当前已有openjdk的1.7和1.8版本，我们需要将其卸载；
卸载上一步发现的已装的jdk，执行以下命令：

wget --no-check-certificate --no-cookies --header "Cookie: oraclelicense=accept-securebackup-cookie"  http://download.oracle.com/otn-pub/java/jdk/8u151-b12/e758a0de34e24606bca991d704f6dcbf/jdk-8u151-linux-x64.tar.gz

下载jdk-8u161-linux-x64.tar.gz，官网地址：http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

export JAVA_HOME=/usr/local/jdk1.8.0_151

export JRE_HOME=${JAVA_HOME}/jre

export CLASSPATH=.:${JAVA_HOME}/lib/dt.JAVA_HOME/lib/tools.jar:${JRE_HOME}/lib

export PATH=${JAVA_HOME}/bin:${PATH}

安装maven

wget http://mirrors.tuna.tsinghua.edu.cn/apache/maven/maven-3/3.3.9/binaries/apache-maven-3.3.9-bin.tar.gz

tar -zxvf apache-maven-3.3.9-bin.tar.gz

mv apache-maven-3.3.9 maven

(这一步骤可省略，主要是为了后面方便操作) 重命名
配置配置文件

vim /etc/profile

M3_HOME=/usr/local/tools/maven/maven

export PATH=${M3_HOME}/bin:${PATH}

配置文件生效

source /etc/profile

查看maven版本

mvn -v

Apache Maven 3.3.9 (bb52d8502b132ec0a5a3f4c09453c07478323dc5; 2015-11-11T00:41:47+08:00)
Maven home: /usr/local/tools/maven/maven
Java version: 1.8.0_141, vendor: Oracle Corporation
Java home: /usr/local/tools/jdk1.8.0_141/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "3.10.0-957.1.3.el7.x86_64", arch: "amd64", family: "unix"