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1 ¡¢ÀûÓà System.getProperty() º¯Êý»ñÈ¡µ±Ç°Â·¾¶£º
System.out.println(System.getProperty("user.dir"));//user.dir Ö¸¶¨Á˵±Ç°µÄ·¾¶
 
2 ¡¢Ê¹Óà File ÌṩµÄº¯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() ºÍ File.getAbsolutePath() ´óÔ¼Ö»ÊǶÔÓÚ new File(".") ºÍ new File("..") Á½ÖÖ·¾¶ÓÐËùÇø±ð¡£
 
# ¶ÔÓÚ getCanonicalPath() º¯Êý£¬“ ." ¾Í±íʾµ±Ç°µÄÎļþ¼Ð£¬¶ø” .. “Ôò±íʾµ±Ç°Îļþ¼ÐµÄÉÏÒ»¼¶Îļþ¼Ð
# ¶ÔÓÚ getAbsolutePath() º¯Êý£¬Ôò²»¹Ü” . ”¡¢“ .. ”£¬·µ»Øµ±Ç°µÄ·¾¶¼ÓÉÏÄãÔÚ new File() ʱÉ趨µÄ·¾¶
# ÖÁÓÚ getPath() º¯Êý£¬µÃµ½µÄÖ»ÊÇÄãÔÚ new File() ʱÉ趨µÄ·¾¶
 
±ÈÈ統ǰµÄ·¾¶Îª C:\test £º
File directory = new File("abc");
directory.getCanonicalPath(); // µÃµ½µÄÊÇ C:\test\abc
directory.getAbsolutePath();    // µÃµ½µÄÊÇ C:\test\abc
direcotry.getPath();                    // µÃµ½µÄÊÇ abc
 
File directory = new File(".");
directory.getCanonicalPath(); // µÃµ½µÄÊÇ C:\test
directory.getAbsolutePath();    // µÃµ½µÄÊÇ C:\test\.
direcotry.getPath();                    // µÃµ½µÄÊÇ .
 
File directory = new File("..");
directory.getCanonicalPath(); // µÃµ½µÄÊÇ C:\
directory.getAbsolutePath();    // µÃµ½µÄÊÇ C:\test\..
direcotry.getPath();                    // µÃµ½µÄÊÇ ..
 
¹ØÓÚSystem.getProperty·½·¨µÄ²ÎÊý¼û
System.getProperty


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