centos 8.3安裝 OPENJDK

centos 8.3安裝 OPENJDK

查找可安裝的OPENJDK

[root@xamppr10 ~]# yum search java | grep -i --color openjdk

指令執行顯示如下

[root@xamppr10 opt]# yum search java | grep -i --color openjdk
icedtea-web.x86_64 : Additional Java components for OpenJDK - Java browser
java-1.6.0-openjdk.x86_64 : OpenJDK Runtime Environment
java-1.6.0-openjdk-demo.x86_64 : OpenJDK Demos
java-1.6.0-openjdk-devel.x86_64 : OpenJDK Development Environment
java-1.6.0-openjdk-javadoc.x86_64 : OpenJDK API Documentation
java-1.6.0-openjdk-src.x86_64 : OpenJDK Source Bundle
java-1.7.0-openjdk.x86_64 : OpenJDK Runtime Environment
java-1.7.0-openjdk-accessibility.x86_64 : OpenJDK accessibility connector
java-1.7.0-openjdk-demo.x86_64 : OpenJDK Demos
java-1.7.0-openjdk-devel.x86_64 : OpenJDK Development Environment
java-1.7.0-openjdk-headless.x86_64 : The OpenJDK runtime environment without
java-1.7.0-openjdk-javadoc.noarch : OpenJDK API Documentation
java-1.7.0-openjdk-src.x86_64 : OpenJDK Source Bundle
java-1.8.0-openjdk.i686 : OpenJDK Runtime Environment 8
java-1.8.0-openjdk.x86_64 : OpenJDK 8 Runtime Environment
java-1.8.0-openjdk-accessibility.i686 : OpenJDK accessibility connector
java-1.8.0-openjdk-accessibility.x86_64 : OpenJDK accessibility connector
java-1.8.0-openjdk-demo.i686 : OpenJDK Demos 8
java-1.8.0-openjdk-demo.x86_64 : OpenJDK 8 Demos
java-1.8.0-openjdk-devel.i686 : OpenJDK Development Environment 8
java-1.8.0-openjdk-devel.x86_64 : OpenJDK 8 Development Environment
java-1.8.0-openjdk-headless.i686 : OpenJDK Headless Runtime Environment 8
java-1.8.0-openjdk-headless.x86_64 : OpenJDK 8 Headless Runtime Environment
java-1.8.0-openjdk-javadoc.noarch : OpenJDK 8 API documentation
java-1.8.0-openjdk-javadoc-zip.noarch : OpenJDK 8 API documentation compressed
java-1.8.0-openjdk-src.i686 : OpenJDK Source Bundle 8
java-1.8.0-openjdk-src.x86_64 : OpenJDK 8 Source Bundle
java-11-openjdk.i686 : OpenJDK Runtime Environment 11
java-11-openjdk.x86_64 : OpenJDK 11 Runtime Environment
java-11-openjdk-demo.i686 : OpenJDK Demos 11
java-11-openjdk-demo.x86_64 : OpenJDK 11 Demos
java-11-openjdk-devel.i686 : OpenJDK Development Environment 11
java-11-openjdk-devel.x86_64 : OpenJDK 11 Development Environment
java-11-openjdk-headless.i686 : OpenJDK Headless Runtime Environment 11
java-11-openjdk-headless.x86_64 : OpenJDK 11 Headless Runtime Environment
java-11-openjdk-javadoc.i686 : OpenJDK 11 API documentation
java-11-openjdk-javadoc.x86_64 : OpenJDK 11 API documentation
java-11-openjdk-javadoc-zip.i686 : OpenJDK 11 API documentation compressed in a
java-11-openjdk-javadoc-zip.x86_64 : OpenJDK 11 API documentation compressed in
java-11-openjdk-jmods.i686 : JMods for OpenJDK 11
java-11-openjdk-jmods.x86_64 : JMods for OpenJDK 11
java-11-openjdk-src.i686 : OpenJDK Source Bundle 11
java-11-openjdk-src.x86_64 : OpenJDK 11 Source Bundle
java-11-openjdk-static-libs.i686 : OpenJDK libraries for static linking 11
java-11-openjdk-static-libs.x86_64 : OpenJDK 11 libraries for static linking
           

安裝自己想要安裝的版本

我這裡選擇安裝java-11-openjdk.x86_64

[root@xamppr10 ~]# yum install java-11-openjdk.x86_64 -y

指令執行顯示忽略

檢視安裝openjdk版本

[root@xamppr10 ~]# java -version

指令執行顯示如下

設定環境變量

查找安裝java的目錄

[root@xamppr10 ~]# which java

-l:詳細資訊; -r:遞歸子檔案夾

[root@xamppr10 ~]# ls -lr /usr/bin/java

執行如下指令檢視java安裝路徑

[root@xamppr10 ~]# ls -lr /etc/alternatives/java

java的安裝路徑為：

/usr/lib/jvm/java-11-openjdk-11.0.11.0.9-1.el7_9.x86_64/bin/java

編輯profile檔案配置java環境變量

[root@xamppr10 ~]# vim /etc/profile

按鍵盤上的i鍵，進行編輯

添加如下資訊：

export JAVA_HOME=/usr/lib/jvm/java-11-openjdk-11.0.11.0.9-1.el7_9.x86_64
export JRE_HOME=$JAVA_HOME/jre
export CLASSPATH=$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH
           

按鍵盤上的Esc鍵，輸入：wq

配置檔案生效

[root@xamppr10 ~]# source /etc/profile

檢視是否配置成功

[root@xamppr10 ~]# echo $PATH
/usr/lib/jvm/java-11-openjdk-11.0.11.0.9-1.el7_9.x86_64/bin:/usr/lib/jvm/java-11-openjdk-11.0.11.0.9-1.el7_9.x86_64/jre/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin
[root@xamppr10 ~]# echo $CLASSPATH
/usr/lib/jvm/java-11-openjdk-11.0.11.0.9-1.el7_9.x86_64/lib:/usr/lib/jvm/java-11-openjdk-11.0.11.0.9-1.el7_9.x86_64/jre/lib: