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使用java進行文件夾的拷貝

I?have?to?say?this?is?a?very?poor?written?OOP?code.?No?wonder?most?people?are?doing?Micrsoft?ASP(because?it?is?not?OOP?at?all!).?Here?is?the?version?I?cooked?for?about?10-15?min?of?my?time.

public?class?DirCopyUtil?{

????public?static?void?copy(File?src,?File?dest)?throws?IOException?{
????????getCopyable(src).copy(dest);
????}

????//this?is?the?factory?pattern.
????public?static?Copyable?getCopyable(File?src)?{
????????//if?the?source?if?file?then?return?a?file?copier
????????if?(src.isFile())?{
????????????return?new?FileCopier(src);
????????}
????????/*else?it?has?to?be?a?directory?copier,?we?could?also?enhance?it?to?be?other?type?of?copier?such?as?httpcopier?etc...*/
????????return?new?DirCopier(src);

????}

????interface?Copyable?{
????????void?copy(File?dest)?throws?IOException;
????}

????static?class?DirCopier?implements?Copyable?{
????????File?srcDir;

????????public?DirCopier(File?srcDir)?{
????????????if?(!srcDir.isDirectory())?{
????????????????throw?new?IllegalArgumentException("passed?in?paremter?has?to?be?directory"?+?srcDir);
????????????}
????????????this.srcDir?=?srcDir;
????????}
????????/**
?????????*?copy?current?directory?content?under?'destRoot'?directory
?????????*?@param?destRoot??the?destination?root?directory,?all?the?file?and?sub?directory?will?be?copied?under?this
?????????*?destRoot?directory,?if?destRoot?doesn't?exist,?this?will?create?the?directory.
?????????*?@throws?IOException
?????????*/
????????public?void?copy(File?destRoot)?throws?IOException?{
//??????????1)?if?destRoot?is?not?exist?it?will?create?it
????????????if?(!destRoot.exists())?{
????????????????if?(!destRoot.mkdirs())?{
????????????????????throw?new?IOException("unable?to?create?dir:"?+?destRoot);
????????????????}
????????????}
????????????if?(!destRoot.isDirectory())?{
????????????????throw?new?IllegalArgumentException("passed?in?paremter?has?to?be?directory"?+?destRoot);
????????????}
????????????File[]?dirContents?=?srcDir.listFiles();
????????????//we?know?dirContents?can?not?be?null?since?only?file?will?return?null,?so?no?need?to?check?null
????????????for?(int?i?=?0;?i?<?dirContents.length;?i++)?{
????????????????File?_srcFile?=?dirContents[i];
????????????????String?_srcPath?=?_srcFile.getCanonicalPath();
????????????????/*now?I?need?to?get?the?relative?path
????????????????question?here?is?c:\abc\?cannonicalpath?return??"c:\abc"?or?"c:\\abc\\"??the?answer?is?"c:\\abc"
????????????????so?the?following?statement?never?executed,?but?I?am?just?playing?safe?here?since?I?don't?know?if
????????????????every?JVM?implementation?will?behave?the?same?as?my?XP?machine?and?Sun?1.4?*/
????????????????if?(_srcPath.endsWith(File.separator))?{?//the?endswith?has?subtle?bug,?but?it?should?not?matter
????????????????????_srcPath?=?_srcPath.substring(0,?_srcPath.length()?-?File.separator.length());
????????????????}
????????????????File?dest?=?new?File(destRoot,?_srcPath.substring(_srcPath.lastIndexOf(File.separatorChar)?+?1));
????????????????//here?I?wire?back?to?the?factory?method.
????????????????getCopyable(dirContents[i]).copy(dest);
????????????}
????????}

????}

????static?class?FileCopier?implements?Copyable?{
????????File?src;

????????public?FileCopier(File?src)?{
????????????if?(!src.isFile())?{
????????????????throw?new?IllegalArgumentException("passed?in?paremter?has?to?be?file"?+?src);
????????????}
????????????this.src?=?src;
????????}

????????/**
?????????*?Copy?the?current?file?to?the?dest?file,?if?the?dest?file?doesn't?exist?it?will?be?created.
?????????*?@param?dest??the?destination?file
?????????*?@throws?IOException
?????????*/
????????public?void?copy(File?dest)?throws?IOException?{
????????????if?(!dest.exists())?{
????????????????dest.createNewFile();
????????????}
????????????if?(!dest.isFile())?{
????????????????throw?new?IllegalArgumentException("passed?in?paremter?has?to?be?file"?+?dest);
????????????}

????????????//do?straight?file?copy
????????????FileInputStream?in?=?new?FileInputStream(src);
????????????FileOutputStream?out?=?new?FileOutputStream(dest);
????????????byte[]?buffer?=?new?byte[1024?*?4];?//4k?buffer
????????????int?len?=?0;
????????????while?((len?=?in.read(buffer,?0,?buffer.length))?>?0)?{
????????????????out.write(buffer,?0,?len);
????????????}
????????????in.close();
????????????out.close();
????????}
????}
}

posted on 2008-07-22 17:01 無聲閱讀(379) 評論(0) 編輯收藏所屬分類: 職場生活

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