CentOS7 安装OpenJDK1.8 & OracleJDK1.8

安装OpenJDK1.8 :

检查当前机器是否有自带的JDK:

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rpm -qa |grep java
rpm -qa |grep jdk
rpm -qa |grep gcj

如果没有 则跳至安装步骤,有的话 进行卸载:

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rpm -qa | grep java | xargs rpm -e --nodeps

更新yum源:

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yum update -y

搜索yum中的软件包:

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yum list java-1.8*

安装OpenJDK:

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yum install java-1.8.0-openjdk* -y

验证是否安装成功:

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java -version
返回信息如下,则说明安装成功:
openjdk version "1.8.0_161"
OpenJDK Runtime Environment (build 1.8.0_161-b14)
OpenJDK 64-Bit Server VM (build 25.161-b14, mixed mode)

其它常见问题:

如果出现command not found命令找不到的话,则说明环境除了问题,此时需要找到OpenJDK的安装位置,将其配置到/etc/profile文件中:

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export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.161-3.b14.el6_9.x86_64
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=$CLASSPATH:.:${JAVA_HOME}/lib:${JAVA_HOME}/jre/lib
export PATH=${JAVA_HOME}/bin:${JAVA_HOME}/jre/bin:$PATH

配置完成之后,重新加载一下该文件:

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source /etc/profile


安装OracleJDK1.8 :

下载 OracleJDK1.8 & 上传:

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下载地址:
http://download.oracle.com/otn-pub/java/jdk/8u171-b11/512cd62ec5174c3487ac17c61aaa89e8/jdk-8u171-linux-x64.tar.gz
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➜  Linux Soft scp jdk-8u171-linux-x64.tar.gz root@192.168.1.10:/opt
root@192.168.1.10's password:
jdk-8u171-linux-x64.tar.gz

解压至/usr/:

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[root@centos-linux ~]# cd /opt/           
[root@centos-linux opt]# du -sm jdk-8u171-linux-x64.tar.gz
183 jdk-8u171-linux-x64.tar.gz
[root@centos-linux opt]# tar -xf jdk-8u171-linux-x64.tar.gz
[root@centos-linux opt]# mv jdk
jdk1.8.0_171/ jdk-8u171-linux-x64.tar.gz
[root@centos-linux opt]# mv jdk1.8.0_171 jdk
jdk1.8.0_171/ jdk-8u171-linux-x64.tar.gz
[root@centos-linux opt]# mv jdk1.8.0_171 jdk1.8
[root@centos-linux opt]# mv jdk1.8/ /usr/
[root@centos-linux opt]# cd /usr/
[root@centos-linux usr]# ls
bin etc games include jdk1.8 lib lib64 libexec local sbin share src tmp
[root@centos-linux usr]# cd jdk1.8/
[root@centos-linux jdk1.8]# pwd
/usr/jdk1.8

配置环境变量:

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[root@centos-linux ~]# vim /etc/profile   

# 在/etc/profile文件中大约第54行添加如下内容

# Java Env
export JAVA_HOME=/usr/jdk1.8
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=$CLASSPATH:.:${JAVA_HOME}/lib:${JAVA_HOME}/jre/lib
export PATH=${JAVA_HOME}/bin:${JAVA_HOME}/jre/bin:$PATH

[root@centos-linux ~]# source /etc/profile

验证是否安装成功:

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[root@centos-linux ~]# java -version  
java version "1.8.0_171"
Java(TM) SE Runtime Environment (build 1.8.0_171-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.171-b11, mixed mode)