Java I/o---Get the file directory and write to text

First gets all the file directories under the specified directory, saves them in the list collection, and then creates a text file that will be saved in the list traversal write text.

1. Main Program Class

1  Public classTest {2 3 /** 4 * @param args 5 * *6  Public Static voidMain (string[] args) {7 //TODO auto-generated method stub8 //Get all Java files in the IO directory9File dir =NewFile ("H:\\workspace\\io");Ten  Onelist<file> list = FileList (dir, ". Java");//Path list, incoming filter A  - //Gets a file that matches the condition in the path, writes a txt -File DestFile =NewFile ("H:\\workspace\\testfile\\javalist.txt"); the 

 -             Write2file (List,destfile);  +}

2. Filtering the file method, passing in the specifiedPath Parametersand filesuffix parameter,Returns the File list collection

1 2     /** 3 * Defines a collection that gets the specified filter condition 4 * @param dir path 5 * @param string suffix. java 6 * @re Turn 7 * /8  Public StaticList<file> fileList (File dir, String suffix) {9 //1. Defining a collectionTenlist<file> list =NewArraylist<file> (); One  A //2. Filters -FileFilter filter =NewFilefilterbysuffix (suffix); -Getfilelist (dir, list, filter); the  - returnList -  -}

3. Filter methods and Filter classes

1 /** 2 * Defines a collection that gets the specified filter condition 3 * Multilevel directory, passing list 4 * @param dir path 5 * @param lis T file set 6 * @param filter Filter 7 * /8  Public Static voidGetfilelist (File dir, list<file> List, FileFilter filter) {9file[] files = dir.listfiles ();Ten  One  for(File file:files) { A if(File.isdirectory ()) { -Getfilelist (file, list, filter);//Recursive -}Else{ the //Filter Files - if(filter.accept (file)) { -List.add (file);//Add -} +} -} +} A} at 

1  Public classFilefilterbysuffixImplementsFileFilter {2 3 PrivateString suffix;4 5  PublicFilefilterbysuffix (String suffix) {6 Super();7  This. suffix = suffix;8}9 Ten@Override One  Public BooleanAccept (File pathname) { A //TODO auto-generated method stub - returnPathname.getname (). endsWith (suffix); -} the  -}

4. Write list to file method

1 /** 2 * Write list to txt 3 * @param list file listing 4 * @param destfile Storage Object java file listing 5 */6 Private Static voidWrite2file (list<file> List, File destfile) {7 //TODO auto-generated method stub8BufferedWriter BUFW =NULL;9 Ten Try{ One //Use character buffer object BufferedWriter ABUFW =NewBufferedWriter (NewFileWriter (DestFile)); -  - //Traverse list, write absolute path the  for(File file:list) { -Bufw.write (File.getabsolutepath ());//write absolute path -Bufw.newline ();//Line break -Bufw.flush ();//Brush new record +} -  +}Catch(Exception e) { A //Todo:handle exception at}finally{ - if(BUFW! =NULL){ - Try{ -Bufw.close (); -}Catch(IOException e) { - //TODO auto-generated catch block in Throw NewRuntimeException (); -} to} +} -}

Java I/o---Get the file directory and write to text