Linux系统配置JDK

• 检查系统自带的JDK

• [root@localhost jdk]# rpm -qa|grep jdk
  jdk-1.7.0_67-fcs.x86_64

   

• 卸载自带的JDK

• [root@localhost jdk]# rpm -e --nodeps jdk-1.7.0_67-fcs.x86_64

•  安装新的JDK

• [root@localhost jdk]# pwd
  /home/listen/jdk
  [root@localhost jdk]# ll
  total 123884
  -rw-rw-r--. 1 listen listen 126857158 Apr 26 19:53 jdk-7u67-linux-x64.rpm
  [root@localhost jdk]# rpm -ivh jdk-7u67-linux-x64.rpm 
  Preparing...                          ################################# [100%]
  Updating / installing...
     1:jdk-2000:1.7.0_67-fcs            ################################# [100%]
  Unpacking JAR files...
  	rt.jar...
  	jsse.jar...
  	charsets.jar...
  	tools.jar...
  	localedata.jar...
  	jfxrt.jar...
  [root@localhost jdk]# 

   

•  找到JDK的解压目录

• [root@localhost jdk1.7.0_67]# pwd
  /usr/java/jdk1.7.0_67
  [root@localhost jdk1.7.0_67]# ll
  total 19756
  drwxr-xr-x. 2 root root     4096 May 11 02:31 bin
  -rw-r--r--. 1 root root     3339 Jul 25  2014 COPYRIGHT
  drwxr-xr-x. 4 root root     4096 May 11 02:31 db
  drwxr-xr-x. 3 root root     4096 May 11 02:31 include
  drwxr-xr-x. 5 root root     4096 May 11 02:31 jre
  drwxr-xr-x. 5 root root     4096 May 11 02:31 lib
  -rw-r--r--. 1 root root       40 Jul 25  2014 LICENSE
  drwxr-xr-x. 4 root root       44 May 11 02:31 man
  -rw-r--r--. 1 root root      114 Jul 25  2014 README.html
  -rw-r--r--. 1 root root      499 Jul 25  2014 release
  -rw-r--r--. 1 root root 19902868 Jul 25  2014 src.zip
  -rw-r--r--. 1 root root   110114 Jul 24  2014 THIRDPARTYLICENSEREADME-JAVAFX.txt
  -rw-r--r--. 1 root root   173559 Jul 25  2014 THIRDPARTYLICENSEREADME.txt
  [root@localhost jdk1.7.0_67]# 

   

• 配置JDK

• [root@localhost jdk]# vi /etc/profile
  #在文件末尾追加以下内容，保存
  export JAVA_HOME=/usr/java/jdk1.7.0_67
  export JRE_HOME=${JAVA_HOME}/jre
  export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
  export PATH=${JAVA_HOME}/bin:$PATH
  
  #保存完毕，后重新加载jdk信息，使配置生效
  [root@localhost jdk]# source /etc/profile

• 测试JDK

• [root@localhost jdk]# 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
    -d <directory>             Specify where to place generated class files
    -s <directory>             Specify where to place generated source 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
    -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@localhost jdk]# 

over！