java获得当前路径【Z】

1、利用System.getProperty()函数获取当前路径：

System.out.println(System.getProperty("user.dir"));//user.dir指定了当前的路径

2、使用File提供的函数获取当前路径：

File directory = new File("");//设定为当前文件夹
try{
    System.out.println(directory.getCanonicalPath());//获取标准的路径
    System.out.println(directory.getAbsolutePath());//获取绝对路径
}catch(Exceptin e){}

File.getCanonicalPath()和File.getAbsolutePath()大约只是对于new File(".")和new File("..")两种路径有所区别。

# 对于getCanonicalPath()函数，“."就表示当前的文件夹，而”..“则表示当前文件夹的上一级文件夹
# 对于getAbsolutePath()函数，则不管”.”、“..”，返回当前的路径加上你在new File()时设定的路径
# 至于getPath()函数，得到的只是你在new File()时设定的路径

比如当前的路径为 C:\test ：

File directory = new File("abc");
directory.getCanonicalPath(); //得到的是C:\test\abc
directory.getAbsolutePath();    //得到的是C:\test\abc
direcotry.getPath();                    //得到的是abc

File directory = new File(".");
directory.getCanonicalPath(); //得到的是C:\test
directory.getAbsolutePath();    //得到的是C:\test\.
direcotry.getPath();                    //得到的是.

 

File directory = new File("..");
directory.getCanonicalPath(); //得到的是C:\
directory.getAbsolutePath();    //得到的是C:\test\..
direcotry.getPath();                    //得到的是..

另外：System.getProperty()中的字符串参数如下：

Java代码

 System.getProperty()参数大全
 # java.version                                Java Runtime Environment version
 # java.vendor                                Java Runtime Environment vendor
 # java.vendor.url                           Java vendor URL
 # java.home                                Java installation directory
 # java.vm.specification.version   Java Virtual Machine specification version
 # java.vm.specification.vendor    Java Virtual Machine specification vendor
 # java.vm.specification.name      Java Virtual Machine specification name
 # java.vm.version                        Java Virtual Machine implementation version
 # java.vm.vendor                        Java Virtual Machine implementation vendor
 # java.vm.name                        Java Virtual Machine implementation name
 # java.specification.version        Java Runtime Environment specification version
 # java.specification.vendor         Java Runtime Environment specification vendor
 # java.specification.name           Java Runtime Environment specification name
 # java.class .version                    Java  class  format version number
 # java.class .path                      Java  class  path
 # java.library.path                 List of paths to search when loading libraries
 # java.io.tmpdir                       Default temp file path
 # java.compiler                       Name of JIT compiler to use
 # java.ext.dirs                       Path of extension directory or directories
 # os.name                              Operating system name
 # os.arch                                  Operating system architecture
 # os.version                       Operating system version
 # file.separator                         File separator ("/"  on UNIX)
 # path.separator                  Path separator (":"  on UNIX)
 # line.separator                       Line separator ("\n"  on UNIX)
 # user.name                        User's account name
 # user.home                              User's home directory
 # user.dir                               User's current working directory