Java獲取當前路徑

一、利用System.getProperty()函數獲取當前路徑： System.out.println(System.getProperty("user.dir"));//user.dir指定了當前的路徑 二、使用File提供的函數獲取當前路徑： File directory = new File("");//設定爲當前文件夾 try{ System.out.println(directory.getCanonicalPath());//獲取標準的路徑 System.out.println(directory.getAbsolutePath());//獲取絕對路徑 }catch(Exceptin e){} File.getCanonicalPath()和File.getAbsolutePath()大約只是對於new File(".")和new File("..")兩種路徑有所區別。 # 對於getCanonicalPath()函數，「."就表示當前的文件夾，而」..「則表示當前文件夾的上一級文件夾 # 對於getAbsolutePath()函數，則無論」.」、「..」，返回當前的路徑加上你在new File()時設定的路徑 # 至於getPath()函數，獲得的只是你在new File()時設定的路徑 好比當前的路徑爲 C:\test ： File directory = new File("abc"); directory.getCanonicalPath(); //獲得的是C:\test\abc directory.getAbsolutePath(); //獲得的是C:\test\abc direcotry.getPath(); //獲得的是abc File directory = new File("."); directory.getCanonicalPath(); //獲得的是C:\test directory.getAbsolutePath(); //獲得的是C:\test\. direcotry.getPath(); //獲得的是. File directory = new File(".."); directory.getCanonicalPath(); //獲得的是C:\ directory.getAbsolutePath(); //獲得的是C:\test\.. direcotry.getPath(); //獲得的是.. 另外：System.getProperty()中的字符串參數以下： System.getProperty()參數大全 # 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