1. Step 1: Execute the rpm -qa|grep jdk command to view the current jdk situation.
Results of the: java-1.8.0-openjdk-1.8.0.65-3.b17.el7.x86_64 java-1.7.0-openjdk-headless-1.7.0.91-2.6.2.3.el7.x86_64 java-1.8.0-openjdk-headless-1.8.0.65-3.b17.el7.x86_64 java-1.7.0-openjdk-1.7.0.91-2.6.2.3.el7.x86_64 [root@localhost /]# yum -y remove Java java-1.7.0-openjdk*
2. Step 2: Execute yum -y remove Java java-1.7.0-openjdk* to uninstall openjdk,
In the process of executing this command, some software that has dependencies on openJDK will be uninstalled and deleted.
Don't worry, it doesn't matter. (do two uninstalls 1.7 and 1.8);
jdk installation:
1. Download jdk
2. Create a new java directory under usr/local to decompress the installation package
tar -zxvf jdk-8u121-linux-x64.tar.gz
3. Environment variable configuration
vi /etc/profile
export JAVA_HOME=/usr/java/jdk1.8.0_111
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
4. Environment variables take effect
source profile
maven install:
1. Download
Official download address: maven_download , the latest version of apache-maven-3.0.5-bin.tar.gz
Official address: maven
2. Unzip
tar zxvf apache-maven-3.0.5-bin.tar.gz (for example, the installation directory is: /home/homer/Apache-maven/apache-maven-3.0.5)
3. Installation
1) Edit /etc/profile
sudo vi /etc/profile
2) Configuration
Configure the maven installation directory:
export MAVEN_HOME =/home/homer/Apache-maven/apache-maven-3.0.5 // installation directory
export PATH=${MAVEN_HOME}/bin:${PATH}