怎样将一张图片写到文件夹中去呢

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Scanner;

public class WritePic {

public static final int MaxFile=1024*1024*5;//图片最大为5M

public static void main(String[] args) {

try {
Scanner sc=new Scanner(System.in);
System.out.println("图片复制到地址为D盘根目录!");
System.out.print("请输入图片的绝对地址和全称:");
String filePath="";
filePath=sc.nextLine();
String fileName="";
System.out.print("请输入复制后的图片名:");
fileName=sc.nextLine();
BufferedInputStream bis=new BufferedInputStream(new FileInputStream(new File(filePath)));
byte[] b=new byte[WritePic.MaxFile];
int len=bis.read(b);
BufferedOut