how can write programe in java for spliting large file by size without truncketing data?

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Java

how can write programe in java for spliting large file by size without truncketing data?
i am having following code wich split the records but data will be get trucketed

import java.io.*;
import java.util.Date;
public class SplitFiles
{   
	FileInputStream fin; 
	FileOutputStream fout;
	int len;  
	int splitlen; 
	String str;   
	
	
	SplitFiles()  
	{        
		try  
	{    
		fin=new FileInputStream("d:\\try.txt"); 
		//str=fileName;
		len=0; 
		splitlen=1024; 
		Split();  
		}        
	catch(FileNotFoundException e)
	{            
		System.out.println("File not found.");
		}  
	catch(IOException e)
	{            
		System.out.println("IOException generated");
		}    
	}   
	void Split()
	{      
		try   
		{      
			int i=0;  
			FileInputStream fin=new FileInputStream("d:\\try.txt");
			int c=fin.read(); 
			while(c!=-1)  
			{               
				FileOutputStream fw=new FileOutputStream("D:\\Manoj_Zete\\auto generated records\\"+new Date().getTime()+".txt");
				while(c!=-1 && len<splitlen)>
				{      
					fw.write(c);  
					c=fin.read(); 
					len++; 
					}    
				len=0; 
				fw.close(); 
				i++;    
				}      
			}      
		catch(Exception e)
		{            
			 
			e.printStackTrace(); 
			
		}  
		}
	
public static void main(String ar[])
{
	new SplitFiles();
	
}
}