openJDK的安装&环境变量
# yum -y install java
Loaded plugins: fastestmirror, langpacks, versionlock
Loading mirror speeds from cached hostfile
Excluding 1 update due to versionlock (use "yum versionlock status" to show it)
Resolving Dependencies
--> Running transaction check
---> Package java-1.8.0-openjdk.x86_64 1:1.8.0.392.b08-2.el7_9 will be installed
--> Processing Dependency: java-1.8.0-openjdk-headless(x86-64) = 1:1.8.0.392.b08-2.el7_9 for package: 1:java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64
--> Processing Dependency: libjvm.so(SUNWprivate_1.1)(64bit) for package: 1:java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64
--> Processing Dependency: libjava.so(SUNWprivate_1.1)(64bit) for package: 1:java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64
--> Processing Dependency: libjvm.so()(64bit) for package: 1:java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64
--> Processing Dependency: libjava.so()(64bit) for package: 1:java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64
--> Running transaction check
---> Package java-1.8.0-openjdk-headless.x86_64 1:1.8.0.392.b08-2.el7_9 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
========================================================================================================================================================================================================
Package Arch Version Repository Size
========================================================================================================================================================================================================
Installing:
java-1.8.0-openjdk x86_64 1:1.8.0.392.b08-2.el7_9 updates 319 k
Installing for dependencies:
java-1.8.0-openjdk-headless x86_64 1:1.8.0.392.b08-2.el7_9 updates 33 M
Transaction Summary
========================================================================================================================================================================================================
Install 1 Package (+1 Dependent package)
Total download size: 33 M
Installed size: 111 M
Downloading packages:
(1/2): java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64.rpm | 319 kB 00:00:00
(2/2): java-1.8.0-openjdk-headless-1.8.0.392.b08-2.el7_9.x86_64.rpm | 33 MB 00:00:01
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total 20 MB/s | 33 MB 00:00:01
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : 1:java-1.8.0-openjdk-headless-1.8.0.392.b08-2.el7_9.x86_64 1/2
Installing : 1:java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64 2/2
Verifying : 1:java-1.8.0-openjdk-headless-1.8.0.392.b08-2.el7_9.x86_64 1/2
Verifying : 1:java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64 2/2
Installed:
java-1.8.0-openjdk.x86_64 1:1.8.0.392.b08-2.el7_9
Dependency Installed:
java-1.8.0-openjdk-headless.x86_64 1:1.8.0.392.b08-2.el7_9
Complete!
# rpm -qa | grep java
java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64
javapackages-tools-3.4.1-11.el7.noarch
tzdata-java-2023c-1.el7.noarch
java-1.8.0-openjdk-headless-1.8.0.392.b08-2.el7_9.x86_64
python-javapackages-3.4.1-11.el7.noarch
# yum info java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64
Loaded plugins: fastestmirror, langpacks, versionlock
Loading mirror speeds from cached hostfile
Excluding 1 update due to versionlock (use "yum versionlock status" to show it)
Installed Packages
Name : java-1.8.0-openjdk
Arch : x86_64
Epoch : 1
Version : 1.8.0.392.b08
Release : 2.el7_9
Size : 646 k
Repo : installed
From repo : updates
Summary : OpenJDK 8 Runtime Environment
URL : http://openjdk.java.net/
License : ASL 1.1 and ASL 2.0 and BSD and BSD with advertising and GPL+ and GPLv2 and GPLv2 with exceptions and IJG and LGPLv2+ and MIT and MPLv2.0 and Public Domain and W3C and zlib
Description : The OpenJDK 8 runtime environment.
# yum info java-1.8.0-openjdk-headless-1.8.0.392.b08-2.el7_9.x86_64
Loaded plugins: fastestmirror, langpacks, versionlock
Loading mirror speeds from cached hostfile
Excluding 1 update due to versionlock (use "yum versionlock status" to show it)
Installed Packages
Name : java-1.8.0-openjdk-headless
Arch : x86_64
Epoch : 1
Version : 1.8.0.392.b08
Release : 2.el7_9
Size : 111 M
Repo : installed
From repo : updates
Summary : OpenJDK 8 Headless Runtime Environment
URL : http://openjdk.java.net/
License : ASL 1.1 and ASL 2.0 and BSD and BSD with advertising and GPL+ and GPLv2 and GPLv2 with exceptions and IJG and LGPLv2+ and MIT and MPLv2.0 and Public Domain and W3C and zlib
Description : The OpenJDK 8 runtime environment without audio and video support.
# java -version
openjdk version "1.8.0_392"
OpenJDK Runtime Environment (build 1.8.0_392-b08)
OpenJDK 64-Bit Server VM (build 25.392-b08, mixed mode)
# which java
/usr/bin/java
# ll /bin/java
lrwxrwxrwx 1 root root 22 Dec 16 20:54 /bin/java -> /etc/alternatives/java
# ls -l /usr/bin/java
lrwxrwxrwx 1 root root 22 Dec 16 20:54 /usr/bin/java -> /etc/alternatives/java
# rpm -qf /usr/bin/java
java-1.8.0-openjdk-headless-1.8.0.392.b08-2.el7_9.x86_64
# rpm -qf /bin/java
java-1.8.0-openjdk-headless-1.8.0.392.b08-2.el7_9.x86_64
# echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin
# tail /etc/profile
JAVA_HOME=/path/to/jdk
JRE_HOME=/path/to/jdk/jre
PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib
export JAVA_HOME JRE_HOME PATH CLASSPATH
openJDK的卸载
# yum -y remove java*
Loaded plugins: fastestmirror, langpacks, versionlock
Resolving Dependencies
--> Running transaction check
---> Package java-1.8.0-openjdk.x86_64 1:1.8.0.392.b08-2.el7_9 will be erased
---> Package java-1.8.0-openjdk-headless.x86_64 1:1.8.0.392.b08-2.el7_9 will be erased
---> Package javapackages-tools.noarch 0:3.4.1-11.el7 will be erased
--> Finished Dependency Resolution
Dependencies Resolved
========================================================================================================================================================================================================
Package Arch Version Repository Size
========================================================================================================================================================================================================
Removing:
java-1.8.0-openjdk x86_64 1:1.8.0.392.b08-2.el7_9 @updates 646 k
java-1.8.0-openjdk-headless x86_64 1:1.8.0.392.b08-2.el7_9 @updates 111 M
javapackages-tools noarch 3.4.1-11.el7 @base 156 k
Transaction Summary
========================================================================================================================================================================================================
Remove 3 Packages
Installed size: 111 M
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Erasing : 1:java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64 1/3
Erasing : 1:java-1.8.0-openjdk-headless-1.8.0.392.b08-2.el7_9.x86_64 2/3
Erasing : javapackages-tools-3.4.1-11.el7.noarch 3/3
Verifying : 1:java-1.8.0-openjdk-headless-1.8.0.392.b08-2.el7_9.x86_64 1/3
Verifying : 1:java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64 2/3
Verifying : javapackages-tools-3.4.1-11.el7.noarch 3/3
Removed:
java-1.8.0-openjdk.x86_64 1:1.8.0.392.b08-2.el7_9 java-1.8.0-openjdk-headless.x86_64 1:1.8.0.392.b08-2.el7_9 javapackages-tools.noarch 0:3.4.1-11.el7
Complete!
# which java
/usr/bin/which: no java in (/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin)
# java -version
-bash: java: command not found
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