JAVA learning lesson 55th-IO stream (9) file cutting Synthesizer

JAVA learning lesson 55th-IO stream (9) file cutting Synthesizer

File Cutter

Private static final int SIZE = 1024*1024; public static void splitFile (File file) throws IOException {// read the stream associated File (the file format is not determined) fileInputStream FCM = new FileInputStream (file); // the source is a byte [] by = new byte [SIZE]; // defines the 1 m buffer FileOutputStream fos = null; // do not know how many int len = 0; int count = 1; // record the number of subfiles File dir = new File ("D: \ patFiles "); if (! Dir. isFile () {dir. mkdirs () ;}while (len = Fi. read ())! =-1) {fos = new FileOutputStream (new File (dir, (count ++) + ". part "); // custom file format fos. write (by, 0, len);} fos. close (); FCM. close ();}

File Merging

Public static void main (String [] args) throws IOException {File file = new File ("D: \ PartFile"); Merge (file );} public static void Merge (File dir) throws IOException {ArrayList
 
  
AL = new ArrayList
  
   
(); For (int I = 1; I <= 7; I ++) {AL. add (new FileInputStream (new File (dir, I + ". part ");} Enumeration
   
    
En = Collections. enumeration (AL); SequenceInputStream sis = new SequenceInputStream (en); FileOutputStream fos = new FileOutputStream (new File (dir, ".mp3 ")); byte [] by = new byte [1024]; int len = 0; while (len = sis. read ())! =-1) {fos. write (by, 0, len);} sis. close (); fos. close ();}
   
  
 

File cutting and merging + configuration file

Import java. io. *; import java. util. arrayList; import java. util. collections; import java. util. enumeration; import java. util. properties; public class Main {private static final int SIZE = 1024*1024; public static void main (String [] args) throws IOException {File file1 = new File ("d: \ NeedSplit \ .mp3 "); File file2 = new File (" D: \ PartFiles "); splitFile (file1); Merge_1 (file2);} public static void splitFile (File file) throws IOException {// read the stream associated file (uncertain File Format) FileInputStream FD = new FileInputStream (file ); // The Source is a byte [] by = new byte [SIZE]; // defines the buffer FileOutputStream fos = null for 1 MB; // The number of int len = 0 unknown; int count = 1; // record the number of sub-files/* The cut file must record the name of the cut file and the number of fragment files processed by the cut, to facilitate the merge * This information for description, use the key-Value Pair method, so use the Properties object */Properties pro = new Properties (); File dir = new File ("D: \ PartFiles"); if (! Dir. isFile () {dir. mkdirs () ;}while (len = Fi. read ())! =-1) {fos = new FileOutputStream (new File (dir, (count ++) + ". part "); // custom file format fos. write (by, 0, len); fos. close () ;}// Save the information of the cut file in the pro collection. setProperty ("partCount", count + ""); pro. setProperty ("fileName", file. getName (); fos = new FileOutputStream (new File (dir, count + ". properties "); // store the information of the pro set in the collection pro. store (fos, "save file infmation"); FCM. close ();} public static void Merge_1 (File dir) throws IOException {// get the specified File [] files = dir. listFiles (new SuffixFilter (". properties"); // new Filter if (files. length! = 1) {throw new RuntimeException (dir + "files without the properties extension in this directory or not unique");} // record the configuration File object File confile = files [0]; // obtain the configuration file information Properties pro = new Properties (); FileInputStream FD = new FileInputStream (confile); // associate the stream object pro. load (FCM); // load information String filename = pro. getProperty ("fileName"); // get the file name int count = Integer. parseInt (pro. getProperty ("partCount"); // get the number of shards // get all the fragment files in the directory // define the filter, determine whether the number of fragment files is consistent with the fragment information in the configuration information. File [] par TFiles = dir. listFiles (new SuffixFilter (". part"); if (partFiles. length! = (Count-1) {throw new RuntimeException ("the number of fragment files is incorrect. It should be" + count +! ");} // Associate the fragment file with the stream object and coexist in the ArrayList
 
  
AL = new ArrayList
  
   
(); For (int I = 0; I
   
    
En = Collections. enumeration (AL); SequenceInputStream sis = new SequenceInputStream (en); // FileOutputStream fos = new FileOutputStream (new File (dir, filename )); byte [] by = new byte [1024]; int len = 0; while (len = sis. read ())! =-1) {fos. write (by, 0, len) ;}sis. close (); fos. close ();}}