linux 7 yum 安装新版 JDK

JDK部署

yum安装
   yum是rpm的管理工具，管理一个软件库，可以很好的解决依赖关系
   
   1) yum安装
   yum install -y java

 

   2) yum更新

   yum update -y  java

 

   3) yum卸载
   
   yum remove -y java
   或
   yum erase -y java

安装JDK

 

[root@promote ~]# yum install java

已加载插件：fastestmirror,langpacks

Loading mirror speeds from cached hostfile

 *base: mirrors.hust.edu.cn

 *extras: mirrors.skyshe.cn

 *updates: mirrors.yun-idc.com

正在解决依赖关系

--> 正在检查事务

---> 软件包 java-1.8.0-openjdk.x86_64.1.1.8.0.45-30.b13.el7_1将被安装

--> 解决依赖关系完成

 

依赖关系解决

 

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

 Package              架构     版本                         源         大小

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

正在安装:

 java-1.8.0-openjdk   x86_64   1:1.8.0.45-30.b13.el7_1      updates   213 k

 

事务概要

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

安装 1 软件包

 

总下载量：213 k

安装大小：501 k

Is this ok [y/d/N]: y

Downloading packages:

java-1.8.0-openjdk-1.8.0.45-30.b13.el7_1.x86_64.rpm       | 213 kB  00:00

Running transaction check

Running transaction test

Transaction test succeeded

Running transaction

  正在安装   :1:java-1.8.0-openjdk-1.8.0.45-30.b13.el7_1.x86_64          1/1

  验证中     : 1:java-1.8.0-openjdk-1.8.0.45-30.b13.el7_1.x86_64          1/1

 

已安装:

 java-1.8.0-openjdk.x86_64 1:1.8.0.45-30.b13.el7_1

 

完毕！

[root@promote ~]#

查看安装目录

[root@promote ~]# whereis java

java: /usr/bin/java /usr/lib/java /etc/java/usr/share/java /usr/share/man/man1/java.1.gz

发现没有再找

[root@promote bin]# ls /usr/bin/java

/usr/bin/java   

找到JVM的目录，这是自带JDK默认安装目录

[root@promote java]# ls /usr/lib/

alsa      games      jvm         modules          sysctl.d

binfmt.d  gcc        jvm-commmon modules-load.d   systemd

cpp       grub       jvm-exports mozilla          tmpfiles.d

crda      java       jvm-private polkit-1         tuned

cups      java-1.5.0 kbd         python2.7        udev

debug     java-1.6.0 kdump       rpm              udisks2

dracut    java-1.7.0 kernel      sendmail         x86_64-redhat-linux6E

firewalld java-1.8.0 locale      sendmail.postfix yum-plugins

firmware  java-ext   modprobe.d  sse2

再看里面

[root@promote jvm]# ls /jvm

java-1.7.0-openjdk-1.7.0.79-2.5.5.1.el7_1.x86_64

java-1.8.0-openjdk-1.8.0.45-30.b13.el7_1.x86_64这就是目录包

jre

jre-1.7.0

jre-1.7.0-openjdk

jre-1.7.0-openjdk-1.7.0.79-2.5.5.1.el7_1.x86_64

jre-1.8.0

jre-1.8.0-openjdk

jre-1.8.0-openjdk-1.8.0.45-30.b13.el7_1.x86_64

jre-openjdk

找到了很长

[root@promote jre]# ls/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.45-30.b13.el7_1.x86_64/jre/

bin lib

下面开始编辑环境变量/etc/profile

 

[root@promote jre]# vim /etc/profile

添加如下

exportJAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.45-30.b13.el7_1.x86_64/jre/

exportJAVA_BIN=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.45-30.b13.el7_1.x86_64/jre/bin

exportJAVA_LIB=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.45-30.b13.el7_1.x86_64/jre/lib

export PATH=$PATH:$JAVA_BIN

exportCLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

export JAVA_HOME PATH CLASSPATH

修改默认加载JDK版本

[root@promote ~]# sudo update-alternatives--install /usr/bin/java java/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.45-30.b13.el7_1.x86_64/bin/java 300

[root@promote ~]# sudo update-alternatives--install /usr/bin/java javac /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.45-30.b13.el7_1.x86_64/bin/javac300

[root@promote ~]#

或者

[root@promote ~]# sudo update-alternatives--config java

 

共有 3个提供“java”的程序。

 

  选项   命令

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

*+ 1          /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.79-2.5.5.1.el7_1.x86_64/jre/bin/java

  2          /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.45-30.b13.el7_1.x86_64/jre/bin/java

  3          /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.45-30.b13.el7_1.x86_64/bin/java

 

按 Enter保留当前选项[+]，或者键入选项编号：2

[root@promote ~]# java -version

openjdk version "1.8.0_45"

OpenJDK Runtime Environment (build1.8.0_45-b13)

OpenJDK 64-Bit Server VM (build 25.45-b02,mixed mode)

测试成功