1. 使用yum查找jdk: yum search java|grep jdk

    # yum search java|grep jdk
    
ldapjdk-javadoc.noarch : Javadoc for ldapjdk
    
java-1.6.-openjdk.x86_64 : OpenJDK Runtime Environment
    
java-1.6.-openjdk-demo.x86_64 : OpenJDK Demos
    
java-1.6.-openjdk-devel.x86_64 : OpenJDK Development Environment
    
java-1.6.-openjdk-javadoc.x86_64 : OpenJDK API Documentation
    
java-1.6.-openjdk-src.x86_64 : OpenJDK Source Bundle
    
java-1.7.-openjdk.x86_64 : OpenJDK Runtime Environment
    
java-1.7.-openjdk-accessibility.x86_64 : OpenJDK accessibility connector
    
java-1.7.-openjdk-demo.x86_64 : OpenJDK Demos
    
java-1.7.-openjdk-devel.x86_64 : OpenJDK Development Environment
    
java-1.7.-openjdk-headless.x86_64 : The OpenJDK runtime environment without
    
java-1.7.-openjdk-javadoc.noarch : OpenJDK API Documentation
    
java-1.7.-openjdk-src.x86_64 : OpenJDK Source Bundle
    
java-1.8.-openjdk.i686 : OpenJDK Runtime Environment
    
java-1.8.-openjdk.x86_64 : OpenJDK Runtime Environment
    
java-1.8.-openjdk-accessibility.i686 : OpenJDK accessibility connector
    
java-1.8.-openjdk-accessibility.x86_64 : OpenJDK accessibility connector
    
java-1.8.-openjdk-accessibility-debug.i686 : OpenJDK accessibility connector
    
java-1.8.-openjdk-accessibility-debug.x86_64 : OpenJDK accessibility connector
    
java-1.8.-openjdk-debug.i686 : OpenJDK Runtime Environment with full debug on
    
java-1.8.-openjdk-debug.x86_64 : OpenJDK Runtime Environment with full debug on
    
java-1.8.-openjdk-demo.i686 : OpenJDK Demos
    
java-1.8.-openjdk-demo.x86_64 : OpenJDK Demos
    
java-1.8.-openjdk-demo-debug.i686 : OpenJDK Demos with full debug on
    
java-1.8.-openjdk-demo-debug.x86_64 : OpenJDK Demos with full debug on
    
java-1.8.-openjdk-devel.i686 : OpenJDK Development Environment
    
java-1.8.-openjdk-devel.x86_64 : OpenJDK Development Environment
    
java-1.8.-openjdk-devel-debug.i686 : OpenJDK Development Environment with full
    
java-1.8.-openjdk-devel-debug.x86_64 : OpenJDK Development Environment with
    
java-1.8.-openjdk-headless.i686 : OpenJDK Runtime Environment
    
java-1.8.-openjdk-headless.x86_64 : OpenJDK Runtime Environment
    
java-1.8.-openjdk-headless-debug.i686 : OpenJDK Runtime Environment with full
    
java-1.8.-openjdk-headless-debug.x86_64 : OpenJDK Runtime Environment with full
    
java-1.8.-openjdk-javadoc.noarch : OpenJDK API Documentation
    
java-1.8.-openjdk-javadoc-debug.noarch : OpenJDK API Documentation for packages
    
java-1.8.-openjdk-javadoc-zip.noarch : OpenJDK API Documentation compressed in
    
java-1.8.-openjdk-javadoc-zip-debug.noarch : OpenJDK API Documentation
    
java-1.8.-openjdk-src.i686 : OpenJDK Source Bundle
    
java-1.8.-openjdk-src.x86_64 : OpenJDK Source Bundle
    
java-1.8.-openjdk-src-debug.i686 : OpenJDK Source Bundle for packages with
    
java-1.8.-openjdk-src-debug.x86_64 : OpenJDK Source Bundle for packages with
    
java--openjdk.i686 : OpenJDK Runtime Environment
    
java--openjdk.x86_64 : OpenJDK Runtime Environment
    
java--openjdk-debug.i686 : OpenJDK Runtime Environment  with full debug on
    
java--openjdk-debug.x86_64 : OpenJDK Runtime Environment  with full debug on
    
java--openjdk-demo.i686 : OpenJDK Demos
    
java--openjdk-demo.x86_64 : OpenJDK Demos
    
java--openjdk-demo-debug.i686 : OpenJDK Demos  with full debug on
    
java--openjdk-demo-debug.x86_64 : OpenJDK Demos  with full debug on
    
java--openjdk-devel.i686 : OpenJDK Development Environment
    
java--openjdk-devel.x86_64 : OpenJDK Development Environment
    
java--openjdk-devel-debug.i686 : OpenJDK Development Environment  with full
    
java--openjdk-devel-debug.x86_64 : OpenJDK Development Environment  with
    
java--openjdk-headless.i686 : OpenJDK Headless Runtime Environment
    
java--openjdk-headless.x86_64 : OpenJDK Headless Runtime Environment
    
java--openjdk-headless-debug.i686 : OpenJDK Runtime Environment with full
    
java--openjdk-headless-debug.x86_64 : OpenJDK Runtime Environment with full
    
java--openjdk-javadoc.i686 : OpenJDK  API documentation
    
java--openjdk-javadoc.x86_64 : OpenJDK  API documentation
    
java--openjdk-javadoc-debug.i686 : OpenJDK  API documentation for packages
    
java--openjdk-javadoc-debug.x86_64 : OpenJDK  API documentation for packages
    
java--openjdk-javadoc-zip.i686 : OpenJDK  API documentation compressed in
    
java--openjdk-javadoc-zip.x86_64 : OpenJDK  API documentation compressed in
    
java--openjdk-javadoc-zip-debug.i686 : OpenJDK  API documentation compressed
    
java--openjdk-javadoc-zip-debug.x86_64 : OpenJDK  API documentation
    
java--openjdk-jmods.i686 : JMods for OpenJDK
    
java--openjdk-jmods.x86_64 : JMods for OpenJDK
    
java--openjdk-jmods-debug.i686 : JMods for OpenJDK  with full debug on
    
java--openjdk-jmods-debug.x86_64 : JMods for OpenJDK  with full debug on
    
java--openjdk-src.i686 : OpenJDK Source Bundle
    
java--openjdk-src.x86_64 : OpenJDK Source Bundle
    
java--openjdk-src-debug.i686 : OpenJDK Source Bundle for packages with debug
    
java--openjdk-src-debug.x86_64 : OpenJDK Source Bundle  for packages with
    
ldapjdk.noarch : The Mozilla LDAP Java SDK

  2. 执行安装命令：yum install java-1.8.0-openjdk

    安装成功后，默认安装路径在/usr/lib/jvm/下边，
    如/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.144-0.b01.el6_9.x86_64

    查看安装路径(如下所示)：
    which java
    ls -lrt /usr/bin/java

    [root@preproduct1 ~]# which java
    
/usr/bin/java
    
[root@preproduct1 ~]# echo $JAVA_HOME
    
/usr/lib/jvm/java-1.8.-openjdk-1.8.0.191.b12-.el7_6.x86_64
    
[root@preproduct1 ~]# ls -lrt /usr/bin/java
    
lrwxrwxrwx  root root  Feb  : /usr/bin/java -> /etc/alternatives/java
    
[root@preproduct1 ~]# ls -lrt /etc/alternatives/java
    
lrwxrwxrwx  root root  Feb  : /etc/alternatives/java -> /usr/lib/jvm/java-1.8.-openjdk-1.8.0.191.b12-.el7_6.x86_64/jre/bin/java
    
[root@preproduct1 ~]# cd /usr/lib/jvm
    
[root@preproduct1 /usr/lib/jvm]# ll
    
total
    
lrwxrwxrwx  root root    Feb  : java -> /etc/alternatives/java_sdk
    
lrwxrwxrwx  root root    Feb  : java-1.8. -> /etc/alternatives/java_sdk_1.8.0
    
lrwxrwxrwx  root root    Feb  : java-1.8.-openjdk -> /etc/alternatives/java_sdk_1..0_openjdk
    
drwxr-xr-x  root root  Feb  : java-1.8.-openjdk-1.8.0.191.b12-.el7_6.x86_64
    
lrwxrwxrwx  root root    Feb  : java-openjdk -> /etc/alternatives/java_sdk_openjdk
    
lrwxrwxrwx  root root    Feb  : jre -> /etc/alternatives/jre
    
lrwxrwxrwx  root root    Feb  : jre-1.8. -> /etc/alternatives/jre_1.8.0
    
lrwxrwxrwx  root root    Feb  : jre-1.8.-openjdk -> /etc/alternatives/jre_1..0_openjdk
    
lrwxrwxrwx  root root    Feb  : jre-1.8.-openjdk-1.8.0.191.b12-.el7_6.x86_64 -> java-1.8.-openjdk-1.8.0.191.b12-.el7_6.x86_64/jre
    
lrwxrwxrwx  root root    Feb  : jre-openjdk -> /etc/alternatives/jre_openjdk

  3. 验证java是否安装成功

    • 查看java版本：java -version

      # java -version
      
openjdk version "1.8.0_191"
      
OpenJDK Runtime Environment (build 1.8.0_191-b12)
      
OpenJDK -Bit Server VM (build 25.191-b12, mixed mode)

    • 查看java是否可用：javac

      # javac
      
-bash: javac: command not found

      错误原因：默认安装完只有运行环境，java安装目录下只有jre文件夹

  4. 安装开发环境yum install java-1.8.0-openjdk-devel.x86_64
    安装完可看到java安装目录下出现bin、lib等文件夹:

    [root@preproduct1 /usr/lib/jvm/java-1.8.-openjdk-1.8.0.191.b12-.el7_6.x86_64]# l
    
total
    
drwxr-xr-x  root root  Feb  : bin
    
drwxr-xr-x  root root  Feb  : include
    
drwxr-xr-x  root root  Feb  : jre
    
drwxr-xr-x  root root  Feb  : lib
    
drwxr-xr-x  root root  Feb  : tapset

    再次输入javac说明安装成功

    # 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 use
    
  -classpath <path>          Specify where to find user class files and annotationocessors
    
  -cp <path>                 Specify where to find user class files and annotationocessors
    
  -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 compilat is done.
    
  -processor <class1>[,<class2>,<class3>...] Names of the annotation processors ton; 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 imcitly 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 proe
    
  -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

  5. 设置环境变量
    修改/etc/profile文件：vi /etc/profile
    在profile文件末尾新增如下内容：

    #set java environment
    
   JAVA_HOME=/usr/lib/jvm/java-1.8.-openjdk-1.8.0.191.b12-.el7_6.x86_64
    
   JRE_HOME=$JAVA_HOME/jre
    
   CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
    
   PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
    
   export JAVA_HOME JRE_HOME CLASS_PATH PATH

    使环境变量生效：source /etc/profile

    [root@preproduct1 /usr/lib/jvm]# cd /usr/lib/jvm
    
[root@preproduct1 /usr/lib/jvm]# cd java-1.8.-openjdk-1.8.0.191.b12-.el7_6.x86_64/
    
[root@preproduct1 /usr/lib/jvm/java-1.8.-openjdk-1.8.0.191.b12-.el7_6.x86_64]# source /etc/profile
    
[root@preproduct1 /usr/lib/jvm/java-1.8.-openjdk-1.8.0.191.b12-.el7_6.x86_64]# echo $JAVA_HOME
    
/usr/lib/jvm/java-1.8.-openjdk-1.8.0.191.b12-.el7_6.x86_64

至此jdk安装成功

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