检索1.8的列表：

yum list java-1.8*

安装1.8.0的所有文件：

yum install java-1.8.0-openjdk* -y

出现 Complete!表示安装完成

使用命令检查是否安装成功：

#java -version

不需要对path进行手动设置，已自动设置好了

yum install 了之后，java 是默认下载到 /usr/lib/jvm/ 这个目录下。

# find / -name 'java'

其中启动命令需要用到的两个是：

/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.161-3.b14.el6_9.x86_64/bin/java

/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.161-3.b14.el6_9.x86_64/jre/lib/ext

===================

查看JDK的安装路径

# java -version

============================

查看Linux系统版本信息

# cat /etc/redhat-release

CentOS release 6.9 (Final)

[root@li409-225 ~]# cat /etc/issue

CentOS release 6.9 (Final)

Kernel \r on an \m

============================

centos6或centos7都可用的 yum安装jdk

安装之前先检查一下系统有没有自带open-jdk

命令：

rpm -qa |grep java

rpm -qa |grep jdk

rpm -qa |grep gcj

如果没有输入信息表示没有安装。

如果安装可以使用

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

批量卸载所有带有Java的文件 这句命令的关键字是java

检索包含java的列表（可跳过此步）：

yum list java*

检索1.8的列表：

yum list java-1.8*

安装1.8.0的所有文件：

yum install java-1.8.0-openjdk* -y

出现 Complete!表示安装完成

使用命令检查是否安装成功：

#java -version

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)

不需要对path进行手动设置，已自动设置好了

yum install 了之后，java 是默认下载到 /usr/lib/jvm/ 这个目录下。

# find / -name 'java'

/var/lib/alternatives/java

/etc/pki/ca-trust/extracted/java

/etc/pki/java

/etc/alternatives/java

/etc/java

/root/sphinx-for-chinese-2.2.1-dev-r4311/api/java

/usr/share/javadoc/java-1.8.0-openjdk-1.8.0.161-3.b14.el6_9/jre/api/plugin/dom/com/sun/java

/usr/share/javadoc/java-1.8.0-openjdk-1.8.0.161-3.b14.el6_9/jre/api/accessibility/jaccess/spec/com/sun/java

/usr/share/javadoc/java-1.8.0-openjdk-1.8.0.161-3.b14.el6_9/api/org/omg/stub/java

/usr/share/javadoc/java-1.8.0-openjdk-1.8.0.161-3.b14.el6_9/api/java

/usr/share/javadoc/java-1.8.0-openjdk-1.8.0.161-3.b14.el6_9-debug/jre/api/plugin/dom/com/sun/java

/usr/share/javadoc/java-1.8.0-openjdk-1.8.0.161-3.b14.el6_9-debug/jre/api/accessibility/jaccess/spec/com/sun/java

/usr/share/javadoc/java-1.8.0-openjdk-1.8.0.161-3.b14.el6_9-debug/api/org/omg/stub/java

/usr/share/javadoc/java-1.8.0-openjdk-1.8.0.161-3.b14.el6_9-debug/api/java

/usr/share/javadoc/java

/usr/share/doc/db4-devel-4.7.25/ref/java

/usr/share/doc/db4-devel-4.7.25/java

/usr/share/java

/usr/bin/java

/usr/lib/jvm-exports/java

/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.161-3.b14.el6_9.x86_64-debug/jre/bin/java

/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.161-3.b14.el6_9.x86_64-debug/bin/java

/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.161-3.b14.el6_9.x86_64/jre/bin/java

/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.161-3.b14.el6_9.x86_64/bin/java

/usr/lib/jvm/java

/usr/lib/java

---------------------

其中启动命令需要用到的两个是：

/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.161-3.b14.el6_9.x86_64/bin/java

/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.161-3.b14.el6_9.x86_64/jre/lib/ext

============================

腾讯云：

[root@VM_0_6_centos sh]# find / -name 'java'

/var/lib/alternatives/java

/usr/lib/java

/usr/lib/jvm-exports/java

/usr/lib/jvm/java

/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.232.b09-0.el7_7.x86_64/jre/bin/java

/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.232.b09-0.el7_7.x86_64/bin/java

/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.232.b09-0.el7_7.x86_64-debug/jre/bin/java

/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.232.b09-0.el7_7.x86_64-debug/bin/java

/usr/local/lib/python3.6/site-packages/tensorflow/include/external/protobuf_archive/src/google/protobuf/compiler/java

/usr/local/lib/python3.6/site-packages/tensorflow/include/google/protobuf/compiler/java

/usr/bin/java

---------------------

其中启动命令需要用到的两个是：

/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.232.b09-0.el7_7.x86_64/bin/java

/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.232.b09-0.el7_7.x86_64/jre/lib/ext