Linux安装Jdk1.8并配置环境变量

叁歲伎倆 2023-10-04 13:34 43阅读 0赞

1. yum源安装(推荐)

# 检查是否已经存在java相关命令
    rpm -qa|grep java
    rpm -qa|grep jdk
    rpm -qa|grep gcj
    
    # 如果需要卸载
    rpm -qa | grep java | xargs rpm -e --nodeps
    
    # 检索Java1.8源列表
    yum list java-1.8*
    
    # 安装Java1.8
    yum install java-1.8.0-openjdk* -y
    
    # 查询JAVA_HOME
    which java
    
    # 返回
    /usr/bin/java
    
    # ls -l命令
    ls -l /usr/bin/java
    
    # 返回
    lrwxrwxrwx 1 root root 22 Nov 13 14:37 /usr/bin/java -> /etc/alternatives/java
    
    # ls -l命令
    ls -l /etc/alternatives/java
    
    # 返回
    lrwxrwxrwx 1 root root 73 Nov 13 14:37 /etc/alternatives/java -> /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.272.b10-1.el7_9.x86_64/jre/bin/java
    
    # 则JAVA_HOME路径为：/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.272.b10-1.el7_9.x86_64

2. 介质安装

2.1 下载介质

*  官网下载[https://www.oracle.com/cn/java/technologies/javase/javase-jdk8-downloads.html][https_www.oracle.com_cn_java_technologies_javase_javase-jdk8-downloads.html]
    
    ![ef2fdafb40392a482b7e5a50d92e9773.png][]
    
    ![3d15f1de32ddadf3f6666cdd6a8794e4.png][]
    
    ![3449354021e389175a49ae3da6a870b7.png][]
    
      
      登录后即可下载。
 *  百度网盘(推荐)  
      链接：[https://pan.baidu.com/s/10UcCpSIVUk5JhXpGui01IA][https_pan.baidu.com_s_10UcCpSIVUk5JhXpGui01IA]  
      提取码：7suz

2.2 上传并解压

*  在/usr/local/目录下新建文件夹：java
 *  上传介质到/usr/local/java/
 *  解压：tar -zxvf jdk-8u291-linux-x64.tar.gz

2.3 配置环境变量

# 编辑配置文件
    vim /etc/profile
    
    # 在末尾追加
    export JAVA_HOME=/usr/local/java/jdk1.8.0_291
    export JRE_HOME=/usr/local/java/jdk1.8.0_291/jre
    export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib:$CLASSPATH
    export PATH=$JAVA_HOME/bin:$PATH
    
    # 使配置文件生效
    source /etc/profile

2.4 测试

# 测试javac命令
    javac
    
    # 测试java
    java
    
    # 测试版本号
    java -version
    
    # 返回
    java version "1.8.0_291"
    Java(TM) SE Runtime Environment (build 1.8.0_291-b10)
    Java HotSpot(TM) 64-Bit Server VM (build 25.291-b10, mixed mode)
    
    # 查询JAVA_HOME
    echo $JAVA_HOME
    
    # 返回
    /usr/local/java/jdk1.8.0_291

[https_www.oracle.com_cn_java_technologies_javase_javase-jdk8-downloads.html]: https://www.oracle.com/cn/java/technologies/javase/javase-jdk8-downloads.html
[ef2fdafb40392a482b7e5a50d92e9773.png]: https://img-blog.csdnimg.cn/img_convert/ef2fdafb40392a482b7e5a50d92e9773.png
[3d15f1de32ddadf3f6666cdd6a8794e4.png]: https://img-blog.csdnimg.cn/img_convert/3d15f1de32ddadf3f6666cdd6a8794e4.png
[3449354021e389175a49ae3da6a870b7.png]: https://img-blog.csdnimg.cn/img_convert/3449354021e389175a49ae3da6a870b7.png
[https_pan.baidu.com_s_10UcCpSIVUk5JhXpGui01IA]: https://pan.baidu.com/s/10UcCpSIVUk5JhXpGui01IA