Collus

import ?java.io. * ;

/**
*?FileUtil.?Simple?file?operation?class.
*
*? @author ?BeanSoft
*
*/
public ? class ?FileUtil?{
???? /**
?????*?The?buffer.
????? */
???? protected ? static ? byte ?buf[]? = ? new ? byte [ 1024 ];

???? /**
?????*?Read?content?from?local?file.?FIXME?How?to?judge?UTF-8?and?GBK,?the
?????*?correct?code?should?be:?FileReader?fr?=?new?FileReader(new
?????*?InputStreamReader(fileName,?"ENCODING"));?Might?let?the?user?select?the
?????*?encoding?would?be?a?better?idea.?While?reading?UTF-8?files,?the?content
?????*?is?bad?when?saved?out.
?????*
?????*? @param ?fileName?-
?????*????????????local?file?name?to?read
?????*? @return
?????*? @throws ?Exception
????? */
???? public ? static ?String?readFileAsString(String?fileName)? throws ?Exception?{
????????String?content? = ? new ?String(readFileBinary(fileName));

???????? return ?content;
????}
???? /**
?????*?讀取文件并返回為給定字符集的字符串.
?????*? @param ?fileName
?????*? @param ?encoding
?????*? @return
?????*? @throws ?Exception
????? */
???? public ? static ?String?readFileAsString(String?fileName,?String?encoding)? throws ?Exception?{
????????String?content? = ? new ?String(readFileBinary(fileName),?encoding);

???????? return ?content;
????}
???? /**
?????*?讀取文件并返回為給定字符集的字符串.
?????*? @param ?fileName
?????*? @param ?encoding
?????*? @return
?????*? @throws ?Exception
????? */
???? public ? static ?String?readFileAsString(InputStream?in)? throws ?Exception?{
????????String?content? = ? new ?String(readFileBinary(in));

???????? return ?content;
????}

???? /**
?????*?Read?content?from?local?file?to?binary?byte?array.
?????*
?????*? @param ?fileName?-
?????*????????????local?file?name?to?read
?????*? @return
?????*? @throws ?Exception
????? */
???? public ? static ? byte []?readFileBinary(String?fileName)? throws ?Exception?{
????????FileInputStream?fin? = ? new ?FileInputStream(fileName);
???????? return ?readFileBinary(fin);
????}
???? /**
?????*?從輸入流讀取數據為二進制字節數組.
?????*? @param ?streamIn
?????*? @return
?????*? @throws ?IOException
????? */
???? public ? static ? byte []?readFileBinary(InputStream?streamIn)? throws ?IOException?{
????????BufferedInputStream?in? = ? new ?BufferedInputStream(streamIn);

????????ByteArrayOutputStream?out? = ? new ?ByteArrayOutputStream( 10240 );

???????? int ?len;
???????? while ?((len? = ?in.read(buf))? >= ? 0 )
????????????out.write(buf,? 0 ,?len);
????????in.close();

???????? return ?out.toByteArray();???????
????}

???? /**
?????*?Write?string?content?to?local?file.
?????*
?????*? @param ?fileName?-
?????*????????????local?file?name?will?write?to
?????*? @param ?content
?????*????????????String?text
?????*? @return ?true?if?success
?????*? @throws ?IOException
????? */
???? public ? static ? boolean ?writeFileString(String?fileName,?String?content)
???????????? throws ?IOException?{
????????FileWriter?fout? = ? new ?FileWriter(fileName);
????????fout.write(content);
????????fout.close();
???????? return ? true ;
????}

???? /**
?????*?Write?string?content?to?local?file?using?given?character?encoding.
?????*
?????*? @param ?fileName?-
?????*????????????local?file?name?will?write?to
?????*? @param ?content
?????*????????????String?text
?????*? @param ?encoding
?????*????????????the?encoding
?????*? @return ?true?if?success
?????*? @throws ?IOException
????? */
???? public ? static ? boolean ?writeFileString(String?fileName,?String?content,
????????????String?encoding)? throws ?IOException?{
????????OutputStreamWriter?fout? = ? new ?OutputStreamWriter( new ?FileOutputStream(
????????????????fileName),?encoding);

????????fout.write(content);
????????fout.close();
???????? return ? true ;
????}

???? /**
?????*?Write?binary?byte?array?to?local?file.
?????*
?????*? @param ?fileName?-
?????*????????????local?file?name?will?write?to
?????*? @param ?content
?????*????????????binary?byte?array
?????*? @return ?true?if?success
?????*? @throws ?IOException
????? */
???? public ? static ? boolean ?writeFileBinary(String?fileName,? byte []?content)
???????????? throws ?IOException?{
????????FileOutputStream?fout? = ? new ?FileOutputStream(fileName);
????????fout.write(content);
????????fout.close();
???????? return ? true ;
????}

???? /**
?????*?檢查文件名是否合法.文件名字不能包含字符\/:*?"<>|
?????*
?????*? @param ?fileName文件名,不包含路徑
?????*? @return ?boolean?is?valid?file?name
????? */
???? public ? static ? boolean ?isValidFileName(String?fileName)?{
???????? boolean ?isValid? = ? true ;
????????String?errChar? = ? " \\/:*?\ " <>| " ;?//
???????? if ?(fileName? == ? null ? || ?fileName.length()? == ? 0 )?{
????????????isValid? = ? false ;
????????}? else ?{
???????????? for ?( int ?i? = ? 0 ;?i? < ?errChar.length();?i ++ )?{
???????????????? if ?(fileName.indexOf(errChar.charAt(i))? != ? - 1 )?{
????????????????????isValid? = ? false ;
???????????????????? break ;
????????????????}
????????????}
????????}
???????? return ?isValid;
????}

???? /**
?????*?把非法文件名轉換為合法文件名.
?????*
?????*? @param ?fileName
?????*? @return
????? */
???? public ? static ?String?replaceInvalidFileChars(String?fileName)?{
????????StringBuffer?out? = ? new ?StringBuffer();

???????? for ?( int ?i? = ? 0 ;?i? < ?fileName.length();?i ++ )?{
???????????? char ?ch? = ?fileName.charAt(i);
???????????? // ?Replace?invlid?chars:?\\/:*?\"<>|
???????????? switch ?(ch)?{
???????????? case ? ' \\ ' :
???????????? case ? ' / ' :
???????????? case ? ' : ' :
???????????? case ? ' * ' :
???????????? case ? ' ? ' :
???????????? case ? ' \" ' :
???????????? case ? ' < ' :
???????????? case ? ' > ' :
???????????? case ? ' | ' :
????????????????out.append( ' _ ' );
???????????????? break ;
???????????? default :
????????????????out.append(ch);
????????????}
????????}

???????? return ?out.toString();
????}

???? /**
?????*?Convert?a?given?file?name?to?a?URL(URI)?string.
?????*
?????*? @param ?fileName?-
?????*????????????the?file?to?parse
?????*? @return ?-?URL?string
????? */
???? public ? static ?String?filePathToURL(String?fileName)?{
????????String?fileUrl? = ? new ?File(fileName).toURI().toString();
???????? return ?fileUrl;
????}

???? /**
?????*?Write?string?content?to?local?file.
?????*
?????*? @param ?fileName?-
?????*????????????local?file?name?will?write?to
?????*? @param ?content
?????*????????????String?text
?????*? @return ?true?if?success
?????*? @throws ?IOException
????? */
???? public ? static ? boolean ?appendFileString(String?fileName,?String?content)
???????????? throws ?IOException?{
????????OutputStreamWriter?fout? = ? new ?OutputStreamWriter( new ?FileOutputStream(
????????????????fileName,? true ),? " GBK " );

????????fout.write(content);
????????fout.close();
???????? return ? true ;
????}
???? public ? static ? void ?main(String[]?args)?{
????????System.out.println(replaceInvalidFileChars( " http://www.abc.com/ " ));
????}
}