【147】Linux CentOS7 配置Java环境变量

编辑 /root/.bash_profile 文件，内容如下：

# .bash_profile

# Get the aliases and functions
if [ -f ~/.bashrc ]; then
	. ~/.bashrc
fi

# User specific environment and startup programs


export JAVA_HOME=/opt/jdk1.8.0_191

PATH=$PATH:$HOME/bin:$JAVA_HOME/bin

export PATH

export JAVA_HOME=/opt/jdk1.8.0_191 表示定义了变量 JAVA_HOME，并且这个变量可以外部访问。

PATH=$PATH:$HOME/bin:$JAVA_HOME/bin 在系统变量PATH后面追加上 Java 路径

export PATH 设置 PATH 变量可以外部访问。

退出客户端，重新登录，环境变量就可以使用了。运行 javac 命令，出现如下结果，说明环境变量配置成功。

/root$ javac
Usage: javac  
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           Specify where to find user class files and annotation processors
  -cp                  Specify where to find user class files and annotation processors
  -sourcepath          Specify where to find input source files
  -bootclasspath       Override location of bootstrap class files
  -extdirs             Override location of installed extensions
  -endorseddirs        Override location of endorsed standards path
  -proc:{none,only}          Control whether annotation processing and/or compilation is done.
  -processor [,,...] Names of the annotation processors to run; bypasses default discovery process
  -processorpath       Specify where to find annotation processors
  -parameters                Generate metadata for reflection on method parameters
  -d              Specify where to place generated class files
  -s              Specify where to place generated source files
  -h              Specify where to place generated native header files
  -implicit:{none,class}     Specify whether or not to generate class files for implicitly referenced files
  -encoding        Specify character encoding used by source files
  -source           Provide source compatibility with specified release
  -target           Generate class files for specific VM version
  -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                   Pass  directly to the runtime system
  -Werror                    Terminate compilation if warnings occur
  @                Read options and filenames from file

这种方法更为安全，它可以把使用这些环境变量的权限控制到用户级别，如果你需要给某个用户权限使用这些环境变量，你只需要修改其个人用户主目录下的.bash_profile文件就可以了。

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