¼Ò¼³°°ÀºÀÚ¹Ù2ºÎ  Á¦9Àå ÀÚ¹Ù½ºÆ®¸²  9.3.3 File  

9.3.3 File

 

FileŬ·¡½º´Â ÆÄÀÏ ¹× µð·ºÅ丮¸¦ °ü¸®ÇÒ ¼ö ÀÖ´Â ±â´ÉÀ» Á¦°øÇØ Áִ Ŭ·¡½ºÀÔ´Ï´Ù. ÀÌ Å¬·¡½º¸¦ ÀÌ¿ëÇÏ¸é Æ¯Á¤ ÆÄÀÏÀÇ Á¸ÀçÀ¯¹« È®ÀÎ, º¹»ç, À̸§º¯°æ µîÀÇ, ÆÄÀÏ¿¡ °ü·ÃµÈ ÀÛ¾÷À» ÇÒ ¼ö ÀÖ½À´Ï´Ù. ÇÏÁö¸¸ ÇѰ¡Áö À¯ÀÇÇÒ Á¡Àº FileŬ·¡½º ÀÚü¿¡¼­´Â ÆÄÀÏÀÇ ³»¿ëÀ» ÀÔÃâ·ÂÇϱâ À§ÇÑ ¸Þ¼­µå´Â Á¦°øÇØ ÁÖÁö ¾Ê´Â´Ù´Â Á¡ÀÔ´Ï´Ù. ÀÚ¹Ù¿¡¼­´Â ¸ðµç µ¥ÀÌÅÍÀÇ ÀÔÃâ·ÂÀ» ½ºÆ®¸² ±â¹ÝÀ¸·Î ¼öÇàÇϱ⠶§¹®¿¡ FileŬ·¡½º ³»¿¡¼­ ÀÌ·¯ÇÑ ¸Þ¼­µåµéÀ» ±¸ÇöÇÒ Çʿ䰡 ¾ø±â ¶§¹®ÀÔ´Ï´Ù.

 

¢Ñ FileŬ·¡½º

ÆÄÀϰú µð·ºÅ丮¿¡ ´ëÇÑ Á¤º¸¸¦ Á¦°øÇÏ°í °ü¸®ÇÒ ¼ö ÀÖ°Ô ÇØÁØ´Ù.

 

´ÙÀ½ ¿¹Á¦´Â File°´Ã¼¸¦ Çϳª »ý¼ºÇÏ¿©  File Ŭ·¡½ºÀÇ ´Ù¾çÇÑ ¸Þ¼­µå¸¦ ÀÌ¿ëÇÏ¿© ÆÄÀÏÀÇ Á¤º¸¸¦ ¾Ë¾Æº¸´Â ¿¹Á¦ ÀÔ´Ï´Ù. ÀÌ ¿¹Á¦¸¦ ¼öÇàÇϱâ Àü¿¡ FileTest.txt¶ó´Â ÆÄÀÏÀ» ¸¸µé°í .java¿Í °°Àº °æ·Î¿¡ µÎ½Ã±â ¹Ù¶ø´Ï´Ù.

 

FileTest.java (FileŬ·¡½º¸¦ Å×½ºÆ®ÇÑ ¿¹Á¦)

import java.io.File;

class FileTest {

   public static void main(String[] args) {

      File f1 = new File("FileTest.txt");

       System.out.println(" f1.getPath(): "+f1.getPath());

       System.out.println(" f1.getAbsolutePath(): "+f1.getAbsolutePath());

       System.out.println(" f1.getName(): "+f1.getName());

       System.out.println(" f1.getPath(): "+f1.getPath());

       System.out.println(" f1.toString(): "+f1.toString());

       try {

        System.out.println(" f1.toURL(): "+f1.toURL());

     } catch(java.net.MalformedURLException e) {

        System.out.println(" f1.toURL(): "+e);

     }

       System.out.println(" f1.canRead(): "+f1.canRead());

       System.out.println(" f1.canWrite(): "+f1.canWrite());

       System.out.println(" f1.isAbsolute(): "+f1.isAbsolute());

       System.out.println(" f1.isDirectory(): "+f1.isDirectory());

       System.out.println(" f1.isFile(): "+f1.isFile());

       System.out.println(" f1.isHidden(): "+f1.isHidden());

       System.out.println(" f1.lastModified(): "+f1.lastModified());

       System.out.println(" f1.length(): "+f1.length());

       System.out.println(" f1.exists(): "+f1.exists());

   }

}

C:\JavaExample\09>javac FileTest.java

C:\JavaExample\09>java FileTest

 f1.getPath(): FileTest.txt

 f1.getAbsolutePath(): C:\JavaExample\09\FileTest.txt

 f1.getName(): FileTest.txt

 f1.getPath(): FileTest.txt

 f1.toString(): FileTest.txt

 f1.toURL(): file:/C:/JavaExample/09/FileTest.txt

 f1.canRead(): true

 f1.canWrite(): true

 f1.isAbsolute(): false

 f1.isDirectory(): false

 f1.isFile(): true

 f1.isHidden(): false

 f1.lastModified(): 1002950524758

 f1.length(): 75

 f1.exists(): true

 

¿¹Á¦¸¦ ½ÇÇà½Ã۸é À§¿Í °°ÀÌ, »ý¼ºÇÑ ÆÄÀÏ ¡®FileTest.txt¡¯¿¡ ´ëÇÑ Á¤º¸ Áï, »ó´ë°æ·Î, Àý´ë°æ·Î, ÆÄÀÏÀ̸§, µð·ºÅ丮 Á¤º¸, URLµîÀÌ ÇÔ¼ö¸í°ú ÇÔ²² Ãâ·ÂµÇ´Â °ÍÀ» º¼ ¼ö ÀÖ½À´Ï´Ù. Ãâ·ÂµÈ °á°ú¸¦ º¸¸é ¸Þ¼­µå À̸§ ¸¸À¸·Îµµ ¾î¶² Á¤º¸°¡ Ãâ·ÂµÇ¾ú´ÂÁö¿¡ ´ëÇØ ÁüÀÛÇÏ½Ç ¼ö ÀÖÀ» °ÍÀÔ´Ï´Ù. ¸Þ¼­µå¿¡ ´ëÇØ¼­´Â ¾Æ·¡ºÎºÐ¿¡ ´Ù·ç°í ÀÖ½À´Ï´Ù.

 

¿¹Á¦¸¦ ºÐ¼®ÇÏ¸é ¸ÕÀú File °´Ã¼ f1À» »ý¼ºÇÕ´Ï´Ù. À̶§ »ý¼ºÀÚ·Î ¡°FileTest.txt¡±ÆÄÀÏÀ» »ý¼ºÇÕ´Ï´Ù.

 

n        File f1 = new File("FileTest.txt");

 

ÆÄÀϰ´Ã¼ f1¿¡ ´ëÇÑ Á¤º¸¸¦ °¢°¢ÀÇ ¸Þ¼­µå¸¦ ÀÌ¿ëÇØ¼­ Ãâ·ÂÇØÁÝ´Ï´Ù. ¸Þ¼­µåÀÇ ³»¿ëÀº ¾Æ·¡ÀÇ File ÁÖ¿ä ¸â¹ö¸Þ¼­µå¸¦ »ìÆìº¸½Ã±â¹Ù¶ø´Ï´Ù.

 

n        System.out.println(" f1.getPath(): " + f1.getPath());

n        System.out.println(" f1.getAbsolutePath(): " + f1.getAbsolutePath());

n        System.out.println(" f1.getName(): " + f1.getName());

 

URL¿¡ °ü·ÃµÈ ºÎºÐ¿¡¼­ ¿¡·¯°¡ ¹ß»ýÇÒ ¼ö ÀÖÀ¸¹Ç·Î try~catch¹®À¸·Î ó¸®ÇÕ´Ï´Ù.

 

n        try {

n           System.out.println(" f1.toURL(): "+f1.toURL());

n        } catch(java.net.MalformedURLException e) {

n           System.out.println(" f1.toURL(): "+e);

n        }

 

File Ŭ·¡½º´Â ÆÄÀÏÀÇ ´Ù¾çÇÑ Á¤º¸¸¦ ¾Ë¾Æº¸°í °ü¸®ÇÒ ¼ö ÀÖµµ·Ï Çϴ Ŭ·¡½ºÀÔ´Ï´Ù. ÇÁ·Î±×·¡¸Ó´Â ÆÄÀÏ¿¡ °ü·ÃµÈ ´Ù¾çÇÑ ÀÛ¾÷À» ÆÄÀÏ Å¬·¡½º¸¦ ÅëÇØ ÇÒ ¼ö ÀÖ´Â, ¹Ýµå½Ã ¾Ë¾ÆµÎ¾î¾ßÇÒ Å¬·¡½ºÁß Çϳª¶ó°í ÇÒ ¼ö ÀÖ½À´Ï´Ù. ±×·¯³ª ÆÄÀϳ»¿ëÀÇ ÀÔÃâ·ÂµîÀº ÆÄÀÏ Å¬·¡½º¿¡¼­ Á÷Á¢ ´ã´çÇÏÁö ¾ÊÀ¸¹Ç·Î ´ÙÀ½¿¡ »ìÆì º¼ FileInputStream, FileOutputStreamµîÀÇ Å¬·¡½º¸¦ ÀÌ¿ëÇÏ¿© ÀÛ¾÷À» ÇØ¾ß ÇÕ´Ï´Ù.

 

File »ý¼ºÀÚ¸Þ¼­µå

public File(String path) : ÁÖ¾îÁø °æ·Î¸íÀ» Ãß»ó °æ·Î¸íÀ¸·Î ÇÏ´Â »õ·Î¿î File °´Ã¼¸¦ »ý¼ºÇÕ´Ï´Ù.

public File(String path, String name) : path¶ó´Â °æ·Î¿Í name¿¡ ´ëÇÑ ÆÄÀÏ °´Ã¼¸¦ »ý¼ºÇÕ´Ï´Ù.

public File(File dir, String name) : µð·ºÅ丮 dir¿¡ name¿¡ ´ëÇÑ ÆÄÀÏ °´Ã¼¸¦ »ý¼ºÇÕ´Ï´Ù.

 

File ÁÖ¿ä ¸â¹ö¸Þ¼­µå

public String getName() : Ãß»ó °æ·Î¸íÀÌ ³ªÅ¸³»´Â ÆÄÀÏ, ¶Ç´Â µð·ºÅ丮ÀÇ À̸§À» ¹ÝȯÇÕ´Ï´Ù.

public String getParent() : Ãß»ó °æ·Î¸íÀÇ ºÎ¸ð °æ·Î¿¡ ´ëÇÑ °æ·Î¸íÀ» ¹®ÀÚ¿­·Î ¹ÝȯÇÕ´Ï´Ù.

public String getPath() : Ãß»ó °æ·Î¸íÀ» °æ·Î¸í ¹®ÀÚ¿­·Î ¹ÝȯÇÕ´Ï´Ù.

public boolean isAbsolute() : Àý´ë °æ·Î¸íÀÎÁöÀÇ ¿©ºÎ¸¦ ¹ÝȯÇÕ´Ï´Ù.

public boolean canRead() : ÆÄÀÏÀ» Àд °ÍÀÌ °¡´ÉÇÑÁöÀÇ ¿©ºÎ¸¦ ¹ÝȯÇÕ´Ï´Ù.

public boolean exists() : ÆÄÀÏÀÌ Á¸ÀçÇÏ´ÂÁöÀÇ ¿©ºÎ¸¦ ¹ÝȯÇÕ´Ï´Ù.

public boolean isDirectory() : µð·ºÅ丮ÀÎÁöÀÇ ¿©ºÎ¸¦ ¹ÝȯÇÕ´Ï´Ù.

public boolean isFile() : ÆÄÀÏÀÎÁöÀÇ ¿©ºÎ¸¦ ¹ÝȯÇÕ´Ï´Ù.

public long length() : ÆÄÀÏÀÇ Å©±â¸¦ ¾ò½À´Ï´Ù.

public boolean mkdir() : ÀÌ Ãß»ó °æ·Î¸í¿¡ ÇØ´çÇÏ´Â µð·ºÅ丮¸¦ »ý¼ºÇÕ´Ï´Ù.

public boolean renameTo(File dest) : ÆÄÀÏÀÇ À̸§À» º¯°æÇÕ´Ï´Ù.

public boolean setReadOnly() : ÆÄÀÏ ¶Ç´Â µð·ºÅ丮¿¡ ´ëÇÑ read-only ¼Ó¼ºÀ» ¼³Á¤ÇÕ´Ï´Ù.

public int compareTo(File pathname) : µÎ °³ÀÇ Ãß»ó °æ·Î¸íÀÌ °°ÀºÁö¸¦ °Ë»çÇÕ´Ï´Ù.

public URL toURL() throws MalformedURLException : Ãß»ó °æ·Î¸íÀ» URL·Î º¯È¯ÇÕ´Ï´Ù.

 



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