• 周日. 6 月 16th, 2024

    Linux CentOS7 安装JDK1.8

    1. 下载JDK安装包,我是从官网下载的,官网地址
      https://www.oracle.com/java/technologies/javase/javase-jdk8-downloads.html 如下图找到对应的系统版本,这里下载.tar.gz包

    点击链接后会提示你同意协议,然后需要登录Oracle. 登录比较慢多试几次。

    2. 把下载好的源码包上传到linux服务器(我尝试在linux直接用wget下载,提示没有权限)

    3. 解压缩, 复制目录到/usr/local/java

    tar -zxvf jdk-8u251-linux-x64.tar.gz
    mv jdk1.8.0_251/ /usr/local/java

    4. 配置环境变量 /etc/profile

    vim /etc/profile   //如果提示vim找不到可以yum install -y vim 安装

    在末尾添加以边代码

    export JAVA_HOME=/usr/local/java/
    export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
    export PATH=$PATH:$JAVA_HOME/bin

    wq保存;然后在命令行输入 source /etc/profile 使配置生效

    5. 验证java是否安装成功

    [root@VM_0_3_centos java]# java -version
    java version "1.8.0_251"
    Java(TM) SE Runtime Environment (build 1.8.0_251-b08)
    Java HotSpot(TM) 64-Bit Server VM (build 25.251-b08, mixed mode)
    [root@VM_0_3_centos java]# javac
    Usage: javac <options> <source files>
    where possible options include:
      -g                         Generate all debugging info
      -g:none                    Generate no debugging info
      -g:{lines,vars,source}     Generate only some debugging info
      -nowarn                    Generate no warnings
      -verbose                   Output messages about what the compiler is doing
      -deprecation               Output source locations where deprecated APIs are used
      -classpath <path>          Specify where to find user class files and annotation processors
      -cp <path>                 Specify where to find user class files and annotation processors
      -sourcepath <path>         Specify where to find input source files
      -bootclasspath <path>      Override location of bootstrap class files
      -extdirs <dirs>            Override location of installed extensions
      -endorseddirs <dirs>       Override location of endorsed standards path
      -proc:{none,only}          Control whether annotation processing and/or compilation is done.
      -processor <class1>[,<class2>,<class3>...] Names of the annotation processors to run; bypasses default discovery process
      -processorpath <path>      Specify where to find annotation processors
      -parameters                Generate metadata for reflection on method parameters
      -d <directory>             Specify where to place generated class files
      -s <directory>             Specify where to place generated source files
      -h <directory>             Specify where to place generated native header files
      -implicit:{none,class}     Specify whether or not to generate class files for implicitly referenced files
      -encoding <encoding>       Specify character encoding used by source files
      -source <release>          Provide source compatibility with specified release
      -target <release>          Generate class files for specific VM version
      -profile <profile>         Check that API used is available in the specified profile
      -version                   Version information
      -help                      Print a synopsis of standard options
      -Akey[=value]              Options to pass to annotation processors
      -X                         Print a synopsis of nonstandard options
      -J<flag>                   Pass <flag> directly to the runtime system
      -Werror                    Terminate compilation if warnings occur
      @<filename>                Read options and filenames from file
    

    root

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