CentOS 7.9 64位安裝JDK 1.8.x · javabbc開發文檔

# CentOS 7.9 64位安裝JDK 1.8.x 本教程基于：系統版本要求：**CentOS 7.9 64位** 其他請自行更換yum源。參考阿里云：[https://developer.aliyun.com/mirror/centos](https://developer.aliyun.com/mirror/centos) CentOS 7.9 安裝JDK 1.8.x 1.卸載舊版本 ~~~shell # 查看系統是否自帶 jdk rpm -qa |grep java rpm -qa |grep jdk rpm -qa |grep gcj # 如果有輸出信息，批量卸載系統自帶 rpm -qa | grep java | xargs rpm -e --nodeps # 如果使用 yum 安裝的 jdk，請使用下面命令卸載 yum -y remove java-1.8.0-openjdk-headless.x86_64 ~~~ 2.安裝JDK ~~~shell # 檢查 yum 中有沒有 java1.8 包 $ yum list java-1.8* java-1.8.0-openjdk.x86_64 1:1.8.0.272.b10-3.el8_3 AppStream java-1.8.0-openjdk-accessibility.x86_64 1:1.8.0.272.b10-3.el8_3 AppStream java-1.8.0-openjdk-demo.x86_64 1:1.8.0.272.b10-3.el8_3 AppStream java-1.8.0-openjdk-devel.x86_64 1:1.8.0.272.b10-3.el8_3 AppStream java-1.8.0-openjdk-headless.x86_64 1:1.8.0.272.b10-3.el8_3 AppStream java-1.8.0-openjdk-javadoc.noarch 1:1.8.0.272.b10-3.el8_3 AppStream java-1.8.0-openjdk-javadoc-zip.noarch 1:1.8.0.272.b10-3.el8_3 AppStream java-1.8.0-openjdk-src.x86_64 1:1.8.0.272.b10-3.el8_3 AppStream # 開始安裝 yum install java-1.8.0-openjdk* -y ~~~ 3.驗證 ~~~shell # jdk的默認安裝位置為/usr/lib/jvm [root@localhost ~]# java -version openjdk version "1.8.0_222" OpenJDK Runtime Environment (build 1.8.0_222-b10) OpenJDK 64-Bit Server VM (build 25.222-b10, mixed mode) ~~~ 4.配置環境變量 ~~~shell # 查看安裝的jdk路徑 cd /usr/lib/jvm/ # 配置 vi /etc/profile # java export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.282.b08-1.el7_9.x86_64 export CLASSPATH=.:${JAVA_HOME}/jre/lib/rt.jar:${JAVA_HOME}/lib/dt.jar:${JAVA_HOME}/lib/tools.jar export PATH=$PATH:${JAVA_HOME}/bin # 保存并退出 :wq # 配置文件生效 source /etc/profile ~~~