目录
1.4之后再次输入rpm -qa | grep java 查看卸载情况:
2.3解压 jdk-8u131-linux-x64.tar.gz安装包
java作为编程语言使用榜长期第一的语言,在linux中是必不可少的运行环境,今天讲下linux-java的安装配置
1.卸载本地jdk
1.1检查一下系统中是否安装jdk版本
# java -version
1.2检测jdk安装包
# rpm -qa | grep java
//显示如下
java-1.7.0-openjdk-1.7.0.111-2.6.7.8.el7.x86_64
python-javapackages-3.4.1-11.el7.noarch
tzdata-java-2016g-2.el7.noarch
javapackages-tools-3.4.1-11.el7.noarch
java-1.8.0-openjdk-1.8.0.102-4.b14.el7.x86_64
java-1.8.0-openjdk-headless-1.8.0.102-4.b14.el7.x86_64
java-1.7.0-openjdk-headless-1.7.0.111-2.6.7.8.el7.x86_64
1.3卸载本地openjdk
# rpm -e --nodeps tzdata-java-2016g-2.el7.noarch
# rpm -e --nodeps java-1.7.0-openjdk-1.7.0.111-2.6.7.8.el7.x86_64
# rpm -e --nodeps java-1.7.0-openjdk-headless-1.7.0.111-2.6.7.8.el7.x86_64
# rpm -e --nodeps java-1.7.0-openjdk-headless-1.7.0.111-2.6.7.8.el7.x86_64
# rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.102-4.b14.el7.x86_64
//或者使用
# yum remove *openjdk*
1.4之后再次输入rpm -qa | grep java 查看卸载情况:
# rpm -qa | grep java
2.在线下载JDK
2.1进入要安装jdk的目录
# cd /usr/java
2.2在线下载
# wget --no-check-certificate --no-cookies --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/8u131-b11/d54c1d3a095b4ff2b6607d096fa80163/jdk-8u131-linux-x64.rpm
//查看当前文件夹下是否有JDK安装包
# ll
2.3解压 jdk-8u131-linux-x64.tar.gz安装包
# tar -zxvf jdk-8u131-linux-x64.tar.gz -C /usr/lib/jvm
3.配置jdk
3.1配置系统profile文件,配置环境变量
# vim /etc/profile
//写入如下内容
export JAVA_HOME=/usr/java/jdk1.8.0_131
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH
//执行profile文件
# source /etc/profile
4.检查新安装的jdk
# java -version
//显示如下,则安装成功
java version "1.8.0_131"
Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)