Java Learning Lesson 55th-io Stream (ix) file cutting synthesizer

File Cutters

private static final int SIZE = 1024x768 *1024;public static void Splitfile (file file) throws ioexception{//associated file with read stream (indeterminate file format) F Ileinputstream fis = new FileInputStream (file);//source is a byte[] by = new byte[size];//defines 1M buffers fileoutputstream fos = null;//Sinks Don't know how many int len = 0;int count = 1;//Records the number of sub-files file dir = new file ("D:\\patfiles"); if (!dir.isfile ()) {dir.mkdirs ();} while (len = Fis.read (by)!=-1) {fos = new FileOutputStream (The new File (dir, (count++) + ". Part"));//Custom file format fos.write (by,0, Len);} Fos.close (); Fis.close ();}

File merge

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<fileinputstream> AL = new arraylist< Fileinputstream> (); for (int i = 1;i<=7;i++) {al.add (new FileInputStream (New File (dir,i+ ")));} Enumeration<fileinputstream> en = collections.enumeration (AL); Sequenceinputstream sis = new Sequenceinputstream (en); FileOutputStream fos = new FileOutputStream (dir, "Midsummer Lightyear. mp3")); byte[] by = new Byte[1024];int len = 0;while (len = Sis.read (by))!=-1 {fos.write (by, 0, Len);} Sis.close (); Fos.close ();}

file cut merge + config 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;public static void Main (string[] args) Throws IOException {file File1 = new File ("D:\\needsplit\\ Midsummer Lightyear. mp3"); File File2 = new file ("D:\\partfiles"); Splitfile (File1); Merge_1 (file2);} public static void Splitfile (file file) throws ioexception{//is associated with the read stream file (not deterministic) fileinputstream FIS = new FileInputStream ( file);//source is a byte[] by = new byte[size];//defines a buffer of 1M fileoutputstream fos = null;//sinks do not know how many int len = 0;int count = 1;//Record the number of sub-files /* Cut files must record the name of the cut file and the number of fragmented files processed by the cut to facilitate merging * This information is used in order to describe the method of using key-value pairs, so use the Properties object */properties Pro = new properties (); File dir = new file ("D:\\partfiles"), if (!dir.isfile ()) {dir.mkdirs ();} while (len = Fis.read (by)!=-1) {fos = new FileOutputStream (The new File (dir, (count++) + ". Part"));//Custom file format fos.write (by,0, Len); Fos.close ();} Save the post-cut file information in the Pro collection Pro.setproperty ("Partcount", count+ "");p Ro.setproperTy ("FileName", File.getname ()); fos = new FileOutputStream (new file (dir,count+ ". Properties"));// Stores the information for the Pro collection in the collection Pro.store (FOS, "Save file Infmation"); Fis.close ();} public static void Merge_1 (file dir) throws ioexception{//gets the configuration file object under the specified directory file[] files = dir.listfiles (new Suffixfilter (". Properties ")//new a filter if (files.length!=1) {throw new RuntimeException (dir+" file with no properties extension in this directory or not unique ");} Record Profile object File Confile = files[0];//Get profile information Properties Pro = new properties (); FileInputStream fis = new FileInputStream (confile);//Correlation Stream Object Pro.load (FIS);//load information string filename = Pro.getproperty (" FileName ");//get the file name int count = Integer.parseint (Pro.getproperty (" Partcount "));//Get the number of fragments//Get all fragmented files//define filters in this directory Determine whether the number of fragmented files is consistent with fragmentation information in configuration information file[] partfiles = dir.listfiles (New Suffixfilter (". part")); if (partfiles.length!= (count-1) {throw new RuntimeException ("The number of fragmented files is incorrect, should be" +count+ "!) ");} Associates a fragmented file with a stream object and stores the collection in arraylist<fileinputstream> AL = new arraylist<fileinputstream> (); for (int i = 0;i< partfiles.length;i++) {Al.adD (New FileInputStream (Partfiles[i));} Combine multiple streams into a sequence flow enumeration<fileinputstream> en = collections.enumeration (AL); Sequenceinputstream sis = new Sequenceinputstream (en);//Read and write process FileOutputStream fos = new FileOutputStream (New File (dir, filename); byte[] by = new Byte[1024];int len = 0;while ((len = Sis.read (by))!=-1) {fos.write (by, 0, Len);} Sis.close (); Fos.close ();}}

Java Learning Lesson 55th-io Stream (ix) file cutting synthesizer