morcble的blog

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
public class FileReadAndWrite{
 public static void main(String[] args) {
  FileReadAndWrite fileReadAndWrite = new FileReadAndWrite();
  //fileReadAndWrite.splitFile("c:/1.doc");
  fileReadAndWrite.mergeFile("c:/1.doc1","c:/1.doc2");
 }
 
 public void splitFile(String filePath){
  try {
   FileInputStream is = new FileInputStream(filePath);
   int file1Size = is.available()/2;
   int buffersize = 512;
   file1Size = (file1Size/buffersize)*buffersize;
   //int file2Size = is.available() - file1Size;
   
   byte buffer[] = new byte[buffersize];
   
   int i = 0;
   FileOutputStream os1 = new FileOutputStream(filePath+"1");//file 1
   FileOutputStream os2 = new FileOutputStream(filePath+"2");//file 2
   while ((is.read(buffer, 0, buffersize) != -1) && (buffersize > 0)) {
       if((i<file1Size/buffersize)){
        os1.write(buffer);
       }
       else{
        os2.write(buffer);
       }
       i++;
   }
   os1.close();
   os2.close();
   is.close();
   
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
 }
 
 public void mergeFile(String filePath1,String filePath2){
  try {
   FileInputStream is1 = new FileInputStream(filePath1);
   FileInputStream is2 = new FileInputStream(filePath2);
   
   FileOutputStream os1 = new FileOutputStream(filePath1.substring(0,filePath1.length()-1));
   int buffersize = 512;
   byte buffer[] = new byte[buffersize];
   
   while ((is1.read(buffer, 0, buffersize) != -1) && (buffersize > 0)) {
        os1.write(buffer);   
   }
   while ((is2.read(buffer, 0, buffersize) != -1) && (buffersize > 0)) {
       os1.write(buffer);   
  }
   is1.close();
   is2.close();
   os1.close();
   
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
 }
}