Summary in 10.26, pipeline stream usage, RandomAccessFile, DataStream to be further explored., randomaccessstream

Summary in 10.26, pipeline stream usage, RandomAccessFile, DataStream to be further explored., randomaccessstream

1 package test; 2 import java. io. *; 3 import java. nio. channels. fileChannel; 4 import java. util. *; 5 public class Test10_26 6 {7 public static void main (String [] args) throws Exception 8 {9 10} 11 public static void method_delete () 12 {13 File dir = new File ("D: \ testdir \ 111"); 14 removeDir (dir); 15} 16 private static void removeDir (File dir) 17 {18 File [] files = dir. listFiles (); 19 for (Fil E f: files) 20 {21 if (f. isDirectory () 22 {23 removeDir (f); 24} 25 else 26 {27 System. out. println (f. toString () + "-file-" + f. delete (); 28; 29} 30} 31 System. out. println (dir + "-dir-" + dir. delete (); 32; 33} 34 public static void method_PrintWriter () throws IOException 35 {36 BufferedReader bufr = new BufferedReader (new InputStreamReader (System. in); 37 PrintWriter out = new PrintWri Ter (new FileWriter ("d:/a.txt"), true); // refresh in real time, 38 for (String line = null; (line = bufr. readLine ())! = Null;) 39 {40 if ("over ". equals (line) 41 break; 42 System. out. println (line. toUpperCase (); 43 out. println (line. toUpperCase (); // do not worry about writing flush () 44} 45 bufr. close (); 46 out. close (); 47} 48 public static void method_SequenceInputStream_ArrayList () throws IOException 49 {50 ArrayList <InputStream> list = new ArrayList <InputStream> (); 51 File dir = new File ("D:/splitfiles"); 52 for (int I = 0; I <4; I ++) 53 {54 list. add (new FileInputStream (new File (dir, I + ". part "); 55} 56 final Iterator <InputStream> it = list. iterator (); 57 Enumeration <InputStream> en = new Enumeration <InputStream> () 58 {59 public InputStream nextElement () 60 {61 return it. next (); 62} 63 public boolean hasMoreElements () 64 {65 return it. hasNext (); 66} 67}; 68 SequenceInputStream sis = new SequenceInputStre Am (en); 69 BufferedOutputStream bos = new BufferedOutputStream (new FileOutputStream ("D:/splitfiles/1.mp4"); 70 int len = 0; 71 for (byte [] buf = new byte [1024*1024]; (len = sis. read (buf ))! =-1;) 72 {73 bos. write (buf, 0, len); 74 bos. flush (); 75} 76 sis. close (); 77 bos. close (); 78} 79 public static void method_splitfile () throws IOException 80 {81 File file = new File ("D:/222.mp4 "); 82 FileInputStream FCM = new FileInputStream (file); 83 FileOutputStream fos = null; 84 int len = 0; 85 int count = 0; 86 q: while (true) 87 {88 File f = new File ("D:/splitfiles/" + (count ++) + ". part "); 89 fos = new FileOutputStream (f); 90 for (byte [] buf = new byte [1024*1024]; (len = FCM. read (buf ))! =-1;) 91 {92 fos. write (buf, 0, len); 93 if (f. length ()> = 1024*1024*200) 94 {95 continue q; 96} 97} 98 break; 99} 100} 101 public static void method_ByteArrayOutputStream () throws Exception // 102 {103 FileInputStream FCM = new FileInputStream ("D:/111.bmp"); 104 BufferedInputStream bis = new BufferedInputStream (FCM); 105 ByteArrayOutputStream baos = new bytes (); 106 for (int ch = 0; (ch = bis. read ())! =-1;) 107 {108 baos. write (ch); 109} 110 bis. close (); 111 System. out. println (baos. size (); 112 BufferedOutputStream bos = new BufferedOutputStream (new FileOutputStream ("D:/111_copy.bmp"); 113 baos. writeTo (bos); // images are always stored in baos. Advantages !! 114 byte [] retArr = baos. toByteArray (); // you can use ByteArrayInputStream to read data. dumb 115 System. out. println (retArr. length); 116} 117 public static void method_SequenceInputStream () throws Exception118 {119 Vector <InputStream> vector = new Vector <InputStream> (); 120 vector. add (new FileInputStream ("D:/33.mp3"); 121 vector. add (new FileInputStream ("D:/44.mp3"); 122 vector. add (new FileInputStream ("D:/55.mp3"); 123 Enu Meration <InputStream> et = vector. elements (); 124 SequenceInputStream sis = new SequenceInputStream (et); 125 BufferedOutputStream bos = new BufferedOutputStream (new FileOutputStream ("D:/66.mp3"); 126 int len = 0; 127 for (byte [] buf = new byte [1024*1024]; (len = sis. read (buf ))! =-1;) 128 {129 bos. write (buf, 0, len); 130 bos. flush (); 131} 132 sis. close (); 133 bos. close (); 134} 135 public static void method_FileChannel () throws Exception136 {137 FileChannel in = new FileInputStream ("D:/171.bmp "). getChannel (); 138 FileChannel out = new FileOutputStream ("D:/172.16copy.bmp "). getChannel (); 139 out. transferFrom (in, 0, in. size (); 140 in. close (); 141 out. close (); 142} 143}