package test; import java.io.*; import java.util.*; public class Test6 {     public static void main(String[] args) throws Exception     {         String s = "D:/out.mp3"; // 输出目录 & 文件名         List<String> list = new ArrayList<String>();         File dir = new File("D:/aaa"); // 要遍历的目录, 用递归拿文件,文件太多就完蛋.         recursion(dir.listFiles(), list); // 递归函数         String[] ss = new String[list.size()];         for (int i = 0; i < ss.length; i++)         {             ss[i] = list.get(i);         }         System.out.println();         combine(s, ss);     }     public static void recursion(File[] fs, List<String> list) // 递归得所有子目录的.mp3文件.     {         for (File f : fs)         {             if (f.isDirectory())             {                 recursion(f.listFiles(), list);             }             else             {                 if (f.getName().endsWith(".mp3"))                 {                     list.add(f.getAbsolutePath());                 }             }         }     }     private static boolean combine(String outFile, String[] inFiles) throws Exception     {         File out = new File(outFile);         File[] files = new File[inFiles.length];         for (int i = 0; i < files.length; i++)         {             files[i] = new File(inFiles[i]);         }         FileInputStream fis = null;         FileOutputStream fos = new FileOutputStream(outFile, true); // 合并其实就是文件的续写,写成true         for (int i = 0; i < files.length; i++)         {             fis = new FileInputStream(files[i]);             int len = 0;             for (byte[] buf = new byte[1024 * 1024]; (len = fis.read(buf)) != -1;)             {                 fos.write(buf, 0, len);             }         }         fis.close();         fos.close();         return true;     } }