Linux下JDK的安装和配置

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一、JDK下载

1、官网下载jdk安装文件：
http://www.oracle.com/technetwork/java/javase/downloads/index.html

选择对应的jdk版本
根据操作系统选择相应的文件

2、将下载后的文件上传到Linux服务器上相应的目录
示例目录为： /usr/local/tools/

[root@ecs-f034 /]# cd /usr/local/
[root@ecs-f034 local]# mkdir tools
[root@ecs-f034 tools]# ls
total 169396
-rw-r--r-- 1 root root 173285352 Oct 23 23:19 jdk1.8.0_51.tar.gz

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二、JDK安装

1、jdk的安装

[root@ecs-f034 /]# cd /usr/local/
[root@ecs-f034 local]# mkdir java
[root@ecs-f034 local]# tar -zxvf /usr/local/tools/jdk1.8.0_51.tar.gz -C /usr/local/java/

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三、配置JDK

1、修改profile文件，配置环境变量

[root@ecs-f034 local]# vim /etc/profile
export JAVA_HOME=/usr/local/java/jdk1.8.0_51
export CLASSPATH=/usr/local/java/jdk1.8.0_51/lib
export PATH=$JAVA_HOME/bin:$PATH
[root@ecs-f034 local]# source /etc/profile

2、检查是否配置成功

[root@ecs-f034 local]# java -version
java version "1.8.0_51"
Java(TM) SE Runtime Environment (build 1.8.0_51-b16)
Java HotSpot(TM) 64-Bit Server VM (build 25.51-b03, mixed > > > mode)
[root@ecs-f034 tools]# 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