java 安装配置

Centos

源码包安装

安装之前先检查一下系统有没有自带open-jdk
rpm -qa | grep java | xargs rpm -e --nodeps

java 11

tar -zxvf jdk-11.0.14_linux-x64_bin.tar.gz -C /usr/local/
cat >> /etc/profile <<"EOF"
export JAVA_HOME=/usr/local/jdk-11.0.14
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=.:${JAVA_HOME}/bin:$PATH
EOF
source /etc/profile 
java -version

java 8

tar -zxvf jdk-8u202-linux-x64.tar.gz -C /usr/local/

vim /etc/profile 
export JAVA_HOME=/usr/local/jdk1.8.0_212
export CLASSPATH=.:${JAVA_HOME}/lib/dt.jar:${JAVA_HOME}/lib/tools.jar
export PATH=.:${JAVA_HOME}/bin:$PATH

source /etc/profile 
java -version

ubuntu

源码包安装
推荐

download jdk-8u192-linux-x64.tar.gz
tar -zxvf jdk-8u192-linux-x64.tar.gz -C /usr/local/jdk1.8.0_192

vim /etc/profile
export JAVA_HOME=/usr/local/jdk1.8.0_192
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=.:${JAVA_HOME}/bin:$PATH

source /etc/profile 
java -version

windows

JAVA_HOME
D:Program FilesJavajdk1.8.0_202

CLASSPATH
.;%JAVA_HOME%libdt.jar;%JAVA_HOME%libtools.jar;

%JAVA_HOME%bin
%JAVA_HOME%jrebin