Splitting and merging of large Java files

Import java.io.file;import java.io.fileinputstream;import java.io.filenotfoundexception;import  java.io.FileOutputStream;import java.io.FilenameFilter;import java.io.SequenceInputStream; Import java.util.arraylist;import java.util.collections;import java.util.enumeration;import  java.util.List;import java.util.Properties;/** * SplitFile.java *  @author: <a  href= "mailto:[email protected" >bylv</a> *  @DATE:2015-9-7   09:27:43  *  Copyright  (C)  2011 ISoftStone *//** *  function Description: *   *  @author:  <a href= "mailto:[email protected" >bylv</a> *  @DATE :2015-9-7  @TIME:  Morning 09:27:43 */public class splitfile {private static  final int size = 1024 * 1024;//  defines the size of a single file here 1m/** *  function Description:  *   *  @param  args *  @author:  <a href= "mailto:[email protected]" >bylv</a> *   @throws  Exception *  @DATE:2015-9-7  @TIME:  am 09:27:44 */public static  void main (String[] args)  throws Exception {//  split// file file  = new file ("d:/untitled. bmp");// splitfile (File);//  merge File file = new  file ("C:/parfiles"); Mergefile (File);} /** *  Feature Description: Merge files  *  *  @param  file *  @author:  <a href= "Mailto:[email protected" >bylv</a> *  @throws  Exception *  @throws   filenotfoundexception *  @DATE:2015-9-7  @TIME:  Morning 09:47:31 */private static  Void mergefile (File dir)  throws Exception {//  read the split information for the properties file file[]  Files = dir.listfiles (New filenamefilter ()  {@Overridepublic  boolean&Nbsp;accept (File dir, string name)  {return name.endswith (". Properties");}); file file = files[0];//  get information about the file properties pro = new properties (); Fileinputstream fis = new fileinputstream (file);p ro.load (FIS); String filename = pro.getproperty ("FileName"); Int splitcount = integer.valueof ( Pro.getproperty ("Partcount"));if  (files.length != 1)  {throw new exception (dir  +  ", this directory does not have a parsed properties file or not unique");}   Get all fragmented files in this directory File[] partfiles = dir.listfiles (New filenamefilter ()  {@ Overridepublic boolean accept (file dir, string name)  {return name.endsWith ( ". part");}); /  the fragment file into the collection list<fileinputstream> al = new arraylist<fileinputstream> (); for  (int i = 0; i < splitcount; i++)  {try {al.add (new  filEinputstream (Partfiles[i]));}  catch  (exception e)  {//  exception E.printstacktrace ();}} try {//  build File Stream collection Enumeration<fileinputstream> en = collections.enumeration (AL);//   Sequenceinputstream sis = new sequenceinputstream multiple stream synthesis sequences (en); Fileoutputstream fos = new fileoutputstream (New file (Dir, fileName)); byte[]  b = new byte[1024];int len = 0;while  ((Len = sis.read (b))  != -1)  {fos.write (B, 0, len);} Fos.close (); Sis.close ();}  catch  (exception e)  {e.printstacktrace ();}} /** *  Feature Description: Split file  *  *  @param  file *  @author:  <a href= "mailto:[email protected]" >bylv</a> *  @DATE:2015-9-7  @TIME:  Morning 09:28:58  */private static void splitfile (File file)  {try {fileinputstream fs =  new&nBsp FileInputStream (file);//  defines the buffer byte[] b = new byte[size]; fileoutputstream fo = null;int len = 0;int count = 0;/** *   When cutting files, record   cut the name of the file and the number of sub-files cut to facilitate merging  *  this information for a simple description, the use of key-value pairs in the way the Properties object  */properties  pro = new properties ();//  defines the output folder path File dir = new file ("C:/ Parfiles ");//  determines if the folder exists, does not exist then creates if  (!dir.exists ())  {dir.mkdirs ();}   Cutting file while  ((Len = fs.read (b))  != -1)  {fo = new  FileOutputStream (New file (dir,  (count++)  +  ". part"); Fo.write (B, 0, len); Fo.close ();}   Save the cut file information to the properties Pro.setproperty ("Partcount", count +  ");p Ro.setproperty (" FileName ",  file.getname ()); Fo = new fileoutputstream (New file (dir,  (count++)  +  ". Properties");//  write to the properties file Pro.store (fo,  "save file  info "); Fo.close (); Fs.close ();}  catch  (exception e)  {e.printstacktrace ();}}

Splitting and merging of large Java files