java将一个文件的图片（等）复制到另一个文件

public class copyToFile{

private int num = 0;

//将一个文件的东西全部复制到另一个文件夹
public boolean process() {
//文件名后面加日期
//Calendar calendar = Calendar.getInstance();
//String dir = calendar.get(Calendar.YEAR) + "" + getTimeString(calendar.get(Calendar.MONTH)+ 1 + "");

 String savePath = "D://image";
String copyToPath = "D://image_copy//copy"; //String copyToPath = "D://image_copy//copy"+dir;
try {
while(true){
System.out.println("复制 " + savePath + " 目录开始");
long t1 = System.currentTimeMillis();
num = 0;
if(copyFolder(savePath, copyToPath)){
long t2 = System.currentTimeMillis();
System.out.println("复制目录结束，用时：" + (t2-t1) + "ms,共复制：" + num + "文件");
break;
}else{
return false;
}
}
//}
return true;
} catch (Exception ex) {
ex.printStackTrace();

}
return false;
}

public boolean copyFolder(String savePath, String copyToPath) {

try {
File mFile = new File(copyToPath);
if(!mFile .exists()){
(new File(copyToPath)).mkdirs(); // 如果文件夹不存在 则建立新文件夹
}
File a = new File(savePath);
String[] file = a.list();
File temp = null;
for (int i = 0; i < file.length; i++) {
if (savePath.endsWith(File.separator)) {
temp = new File(savePath + file[i]);
} else {
temp = new File(savePath + File.separator + file[i]);
}

if (temp.isFile()) {
String fileName = copyToPath + "/" + (temp.getName()).toString();
File testFile = new File(fileName);
if (!testFile.exists()) {
FileInputStream input = new FileInputStream(temp);
FileOutputStream output = new FileOutputStream(fileName);
byte[] b = new byte[1024 * 5];
int len;
while ((len = input.read(b)) != -1) {
output.write(b, 0, len);
}
output.flush();
output.close();
input.close();
num++;
}
}
if (temp.isDirectory()) {// 如果是子文件夹
copyFolder(savePath + "/" + file[i], copyToPath + "/" + file[i]);
}
}
return true;
} catch (Exception e) {
System.out.println("复制整个文件夹内容操作出错");
e.printStackTrace();
return false;
}
}

private String getTimeString(String time){
if(time.length()<2){
return "0" + time;
}
else{
return time;
}
}

}