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1¡¢ÀûÓÃSystem.getProperty()º¯Êý»ñÈ¡µ±Ç°Â·¾¶£º 
System.out.println(System.getProperty("user.dir"));//user.dirÖ¸¶¨Á˵±Ç°µÄ·¾¶ 
2¡¢Ê¹ÓÃFileÌṩµÄº¯Êý»ñÈ¡µ±Ç°Â·¾¶£º 
File directory = new File("");//É趨Ϊµ±Ç°Îļþ¼Ð 
try{ 
    System.out.println(directory.getCanonicalPath());//»ñÈ¡±ê×¼µÄ·¾¶ 
    System.out.println(directory.getAbsolutePath());//»ñÈ¡¾ø¶Ô·¾¶ 
}catch(Exceptin e){} 
File.getCanonicalPath()ºÍFile.getAbsolutePath()´óÔ¼Ö»ÊǶÔÓÚnew File(".")ºÍnew File("..")Á½ÖÖ·¾¶ÓÐËùÇø±ð¡£ 
# ¶ÔÓÚgetCanonicalPath()º¯Êý£¬“."¾Í±íʾµ±Ç°µÄÎļþ¼Ð£¬¶ø”..“Ôò±íʾµ±Ç°Îļþ¼ÐµÄÉÏÒ»¼¶Îļþ¼Ð 
# ¶ÔÓÚgetAbsolutePath()º¯Êý£¬Ôò²»¹Ü”.”¡¢“..”£¬·µ»Øµ±Ç°µÄ·¾¶¼ÓÉÏÄãÔÚnew File()ʱÉ趨µÄ·¾¶ 
# ÖÁÓÚgetPath()º¯Êý£¬µÃµ½µÄÖ»ÊÇÄãÔÚnew File()ʱÉ趨µÄ·¾¶ 
±ÈÈ統ǰµÄ·¾¶Îª C:\test £º 
File directory = new File("abc"); 
directory.getCanonicalPath(); //µÃµ½µÄÊÇC:\test\abc 
directory.getAbsolutePath();    //µÃµ½µÄÊÇC:\test\abc 
direcotry.getPath();                    //µÃµ½µÄÊÇabc 
File directory = new File("."); 
directory.getCanonicalPath(); //µÃµ½µÄÊÇC:\test 
directory.getAbsolutePath();    //µÃµ½µÄÊÇC:\test\. 
direcotry.getPath();                    //µÃµ½µÄÊÇ. 
File directory = new File(".."); 
directory.getCanonicalPath(); //µÃµ½µÄÊÇC:\ 
directory.getAbsolutePath();    //µÃµ½µÄÊÇC:\test\.. 
direcotry.getPath();                    //µÃµ½µÄÊÇ.. 
ÁíÍ⣺System.getProperty()ÖеÄ×Ö·û´®²ÎÊýÈçÏ£º 
System.getProperty()²ÎÊý´óÈ« 
# java.version