1. 程式人生 > >CentOS7 線上安裝 java

CentOS7 線上安裝 java

 

 

 

使用的是騰訊雲 CentOS7 學生伺服器

 

 

 

1.  檢視自己伺服器是否安裝 Java 

[[email protected]_0_10_centos ~]# yum list installed |grep java

   如果什麼都沒顯示 代表沒有安裝

   如果顯示如下 說明已經安裝 你可選擇解除安裝(末尾有如何解除安裝) 或使用 已安裝的java

【說明已安裝java1.8】

[[email protected]
_0_10_centos ~]# yum list installed |grep java java-1.8.0-openjdk.x86_64 1:1.8.0.181-3.b13.el7_5 @updates java-1.8.0-openjdk-headless.x86_64 1:1.8.0.181-3.b13.el7_5 @updates javapackages-tools.noarch 3.4.1-11.el7 @os python-javapackages.noarch 3.4.1-11.el7 @os tzdata-java.noarch 2018e-3.el7 @updates [
[email protected]
_0_10_centos ~]#

2. 查詢可以線上安裝的java版本

[[email protected]_0_10_centos ~]# yum -y list java*
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
Available Packages
java-1.6.0-openjdk.x86_64                        1:1.6.0.41-1.13.13.1.el7_3    os     
java-1.6.0-openjdk-demo.x86_64                   1:1.6.0.41-1.13.13.1.el7_3    os     
java-1.6.0-openjdk-devel.x86_64                  1:1.6.0.41-1.13.13.1.el7_3    os     
java-1.6.0-openjdk-javadoc.x86_64                1:1.6.0.41-1.13.13.1.el7_3    os     
java-1.6.0-openjdk-src.x86_64                    1:1.6.0.41-1.13.13.1.el7_3    os     
java-1.7.0-openjdk.x86_64                        1:1.7.0.191-2.6.15.4.el7_5    updates
java-1.7.0-openjdk-accessibility.x86_64          1:1.7.0.191-2.6.15.4.el7_5    updates
java-1.7.0-openjdk-demo.x86_64                   1:1.7.0.191-2.6.15.4.el7_5    updates
java-1.7.0-openjdk-devel.x86_64                  1:1.7.0.191-2.6.15.4.el7_5    updates
java-1.7.0-openjdk-headless.x86_64               1:1.7.0.191-2.6.15.4.el7_5    updates
java-1.7.0-openjdk-javadoc.noarch                1:1.7.0.191-2.6.15.4.el7_5    updates
java-1.7.0-openjdk-src.x86_64                    1:1.7.0.191-2.6.15.4.el7_5    updates
java-1.8.0-openjdk.i686                          1:1.8.0.181-3.b13.el7_5       updates
java-1.8.0-openjdk.x86_64                        1:1.8.0.181-3.b13.el7_5       updates
java-1.8.0-openjdk-accessibility.i686            1:1.8.0.181-3.b13.el7_5       updates
java-1.8.0-openjdk-accessibility.x86_64          1:1.8.0.181-3.b13.el7_5       updates
  
...
... 中間省略
...

 
javapackages-tools.noarch                        3.4.1-11.el7                  os     
javaparser.noarch                                1.0.11-3.el7                  epel   
javaparser-javadoc.noarch                        1.0.11-3.el7                  epel   
javassist.noarch                                 3.16.1-10.el7                 os     
javassist-javadoc.noarch                         3.16.1-10.el7                 os     
javastroke.x86_64                                0.5.1-33.el7                  epel   
javawriter.noarch                                2.5.1-4.el7                   epel   
javawriter-javadoc.noarch                        2.5.1-4.el7                   epel   

3.選擇自己需要的版本進行安裝(我選擇java1.8)

[[email protected]_0_10_centos ~]# yum -y install java-1.8.0-openjdk.x86_64
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
epel                                                           | 3.2 kB  00:00:00     
extras                                                         | 3.4 kB  00:00:00     
mysql-connectors-community                                     | 2.5 kB  00:00:00     
mysql-tools-community                                          | 2.5 kB  00:00:00     
...
中間安裝省略
...
  xorg-x11-fonts-Type1.noarch 0:7.5-9.el7                                             

Dependency Updated:
  nspr.x86_64 0:4.19.0-1.el7_5           nss.x86_64 0:3.36.0-7.el7_5                  
  nss-softokn.x86_64 0:3.36.0-5.el7_5    nss-softokn-freebl.x86_64 0:3.36.0-5.el7_5   
  nss-sysinit.x86_64 0:3.36.0-7.el7_5    nss-tools.x86_64 0:3.36.0-7.el7_5            
  nss-util.x86_64 0:3.36.0-1.el7_5      

Complete!  (出現Complete!表示安裝成功)

4. 查詢java是否可以使用

[[email protected]_0_10_centos ~]# java -version
openjdk version "1.8.0_181"
OpenJDK Runtime Environment (build 1.8.0_181-b13)
OpenJDK 64-Bit Server VM (build 25.181-b13, mixed mode)

java 解除安裝

    查詢自己安裝的java

[[email protected]_0_10_centos ~]# yum list installed |grep java
java-1.8.0-openjdk.x86_64            1:1.8.0.181-3.b13.el7_5         @updates   
java-1.8.0-openjdk-headless.x86_64   1:1.8.0.181-3.b13.el7_5         @updates   
javapackages-tools.noarch            3.4.1-11.el7                    @os        
python-javapackages.noarch           3.4.1-11.el7                    @os        
tzdata-java.noarch                   2018e-3.el7                     @updates   

    使用自己查詢的java名字進行解除安裝

[[email protected]_0_10_centos ~]# yum -y remove java-1.8.0-openjdk*

    解除安裝tzdata

yum -y remove tzdata-java.noarch

    解除安裝完成