Merge mp3, vector, Enumeration, SequenceInputStream, FileFilter, anonymous internal class., javafilefilter

Merge mp3, vector, Enumeration, SequenceInputStream, FileFilter, anonymous internal class., javafilefilter

1 package test; 2 3 import java. io. *; 4 import java. util. *; 5 6 public class Test20 7 {8 public static void main (String [] args) throws Exception 9 {10 // search for MP311 File dir = new File ("D:/aaa") from the specified directory "); 12 List <File> list = new ArrayList <File> (); 13 FileFilter filefilter = new FileFilter () 14 {15 public boolean accept (File pathname) 16 {17 if (pathname. getName (). endsWith (". mp3 ") 18 return true; 19 if (path Name. isDirectory () 20 return true; 21 else22 return false; 23} 24}; 25 method (dir. listFiles (filefilter), list, filefilter); // install mp326 doSequence (list) in the list; // merge MP327} 28 private static void doSequence (List <File> list) throws Exception29 {30 Vector <InputStream> vector = new Vector <InputStream> (); 31 for (File f: list) 32 {33 vector. addElement (new FileInputStream (f); 34} 35 Enumeration <InputStream> e = Vector. elements (); 36 SequenceInputStream sis = new SequenceInputStream (e); 37 BufferedOutputStream bos = new BufferedOutputStream (new FileOutputStream ("D:/hebingstream"); 38 int len = 0; 39 for (byte [] buf = new byte [1024*1024]; (len = sis. read (buf ))! =-1;) 40 {41 bos. write (buf, 0, len); 42 bos. flush (); 43} 44 sis. close (); // close (); 45 bos. close (); 46} 47 public static void method (File [] files, List <File> list, FileFilter filefilter) 48 {49 for (File f: files) 50 {51 if (f. isDirectory () 52 method (f. listFiles (filefilter), list, filefilter); 53 else54 list. add (f); 55} 56} 57}

 

Find all the files that meet your needs in the specified directory (including subdirectories) (implemented using the FileFilter anonymous internal class), and write

Can I post error exceptions? It should be that an object is a null pointer.