File类复制文件

import java.io.File;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
public class CreatDirectory
{
 	public static void main(String[] args) throws Exception 
 	{
 		Copy(args); 		
 	}
 	public static void Copy(String args[]) throws Exception
 	{
 		File SourcePath=null;
		File TargetPath=null;
 		if(args.length==2)
 		{
 			SourcePath=new File(args[0]);
 			TargetPath=new File(args[1]);
 			if(SourcePath.getParentFile()==null)
 			{
 				System.out.println("暂不支持整个分区的文件拷贝!");
 			}
 			else if(SourcePath.exists())
 			{ 
 					if(TargetPath.getName().indexOf(".")==-1)
			  		{			  			
		  				TargetPath.mkdirs();
			  			File tempFile=new File(TargetPath.getPath()+File.separator+SourcePath.getName());
			  			readWriteFile(SourcePath,tempFile);
			  		}
			  		else
			  		{
		  				String s=TargetPath.getParent();
		  				(new File(s)).mkdirs();		
						readWriteFile(SourcePath,TargetPath);	
		  			}				
 			}
 			else
 			{
 				System.out.println("源文件不存在!");
 			} 			
 		}
 		else
 		{
 			System.out.println("您输入命令格式不正确!\n\t例如:java CreatDirectory c:\\123.txt d:\\");
 		}
 	} 	
 	public static void readWriteFile(File sourceFile,File targeFile) throws Exception
 	{
 		InputStream input=new FileInputStream(sourceFile);
 		OutputStream output=new FileOutputStream(targeFile); 		
 		int temp=0;
 		while((temp=input.read())!=-1)
 		{
 			output.write(temp);
 		}
 		input.close();
 		output.close();
 	}
}