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  • centos7和centos6通过yum安装JDK1.8

    centos7和centos6通过yum安装JDK1.8

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

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  • 原文地址:https://www.cnblogs.com/brady-wang/p/10787886.html
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