在 CentOS 1804 中手动安装 JDK 1.8

迈不过友情╰ 2022-05-11 02:40 276阅读 0赞

jdk1.8下载页面：[https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html][https_www.oracle.com_technetwork_java_javase_downloads_jdk8-downloads-2133151.html]，下载64位的，后缀名为[tar.gz][]。

1.  使用FlashFXP上传jdk到CentOS，文件位置如图所示：  
    ![70][]
2.  进入jdk所在的文件夹：
    
        [root@CSDNBlog ~]# cd /usr/java/
    
     
3.  查看文件夹下的文件：
    
        [root@CSDNBlog java]# ls
        jdk-8u181-linux-x64.tar.gz
    
     
4.  解压jdk：
    
        tar -zxvf jdk-8u181-linux-x64.tar.gz
    
     
5.  查看解压后的文件夹：
    
        [root@CSDNBlog java]# ls
        jdk1.8.0_181  jdk-8u181-linux-x64.tar.gz
    
     
6.  打开环境配置文件：
    
        [root@CSDNBlog java]# vim /etc/profile
        -bash: vim: command not found
    
    说明没有安装vim，安装vim命令为（为什么要安装vim，使用vi不行吗？这个问题等你安装好了vim之后自己尝试一下就知道了）：
    
        [root@CSDNBlog java]# yum -y install vim
    
    再次打开环境配置文件，下最下面添加以下代码：
    
        #set java jdk1.8.0_191 environment
        JAVA_HOME=/usr/java/jdk1.8.0_191
        JRE_HOME=/usr/java/jdk1.8.0_191/jre
        CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
        PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH
        export JAVA_HOME JRE_HOME CLASS_PATH PATH
    
    /usr/java/jdk1.8.0\_181是刚才解压jdk1.8的路径。
7.  刷新一下：
    
        source /etc/profile
    
      
    测试是否安装成功：
8.      [root@CSDNBlog java]# java -version
        java version "1.8.0_181"
        Java(TM) SE Runtime Environment (build 1.8.0_181-b13)
        Java HotSpot(TM) 64-Bit Server VM (build 25.181-b13, mixed mode)
    
     
9.  查看jdk安装位置：  
    **whereis命令：**  
     
    
        [root@CSDNBlog ~]# whereis java
        java: /usr/java/jdk1.8.0_181/bin/java /usr/java/jdk1.8.0_181/jre/bin/java
    
    **which**命令：
    
        [root@CSDNBlog ~]# which java
        /usr/java/jdk1.8.0_181/bin/java
    
    **java**相关命令：
    
        [root@CSDNBlog ~]# java -verbose
        ...
        [Loaded java.lang.Shutdown from /usr/java/jdk1.8.0_181/jre/lib/rt.jar]
        [Loaded java.lang.Shutdown$Lock from /usr/java/jdk1.8.0_181/jre/lib/rt.jar]
10. java相关命令：
    
        [root@CSDNBlog ~]# java
        Usage: java [-options] class [args...]
                   (to execute a class)
           or  java [-options] -jar jarfile [args...]
                   (to execute a jar file)
        where options include:
            -d32	  use a 32-bit data model if available
            -d64	  use a 64-bit data model if available
            -server	  to select the "server" VM
                          The default VM is server,
                          because you are running on a server-class machine.
        
        
            -cp <class search path of directories and zip/jar files>
            -classpath <class search path of directories and zip/jar files>
                          A : separated list of directories, JAR archives,
                          and ZIP archives to search for class files.
            -D<name>=<value>
                          set a system property
            -verbose:[class|gc|jni]
                          enable verbose output
            -version      print product version and exit
            -version:<value>
                          Warning: this feature is deprecated and will be removed
                          in a future release.
                          require the specified version to run
            -showversion  print product version and continue
            -jre-restrict-search | -no-jre-restrict-search
                          Warning: this feature is deprecated and will be removed
                          in a future release.
                          include/exclude user private JREs in the version search
            -? -help      print this help message
            -X            print help on non-standard options
            -ea[:<packagename>...|:<classname>]
            -enableassertions[:<packagename>...|:<classname>]
                          enable assertions with specified granularity
            -da[:<packagename>...|:<classname>]
            -disableassertions[:<packagename>...|:<classname>]
                          disable assertions with specified granularity
            -esa | -enablesystemassertions
                          enable system assertions
            -dsa | -disablesystemassertions
                          disable system assertions
            -agentlib:<libname>[=<options>]
                          load native agent library <libname>, e.g. -agentlib:hprof
                          see also, -agentlib:jdwp=help and -agentlib:hprof=help
            -agentpath:<pathname>[=<options>]
                          load native agent library by full pathname
            -javaagent:<jarpath>[=<options>]
                          load Java programming language agent, see java.lang.instrument
            -splash:<imagepath>
                          show splash screen with specified image
        See http://www.oracle.com/technetwork/java/javase/documentation/index.html for more details.

[https_www.oracle.com_technetwork_java_javase_downloads_jdk8-downloads-2133151.html]: https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
[tar.gz]: http://download.oracle.com/otn-pub/java/jdk/8u181-b13/96a7b8442fe848ef90c96a2fad6ed6d1/jdk-8u181-linux-x64.tar.gz
[70]: /images/20220511/2183da523f2a42f29e5f2b549e4b1030.png