文件copy

 /**
  * @param srcpic 复制前文件
  * @param despic 复制后文件
  */
 public static void copyPic(String srcpic, String despic) {
     File file1 = new File(srcpic);
     if (file1.length() == 0) {
         return;
     }
     File file2 = new File(despic);
     byte[] b = new byte[(int) file1.length()];
     FileInputStream in = null;
     FileOutputStream out = null;
     try {
         in = new FileInputStream(file1);
         //没有指定文件则会创建
         out = new FileOutputStream(file2);
         //read()--int，-1表示读取完毕
         while (in.read(b) != -1) {
             out.write(b);
         }
         out.flush();
         in.close();
         out.close();

     } catch (Exception e) {
         e.printStackTrace();
     }
 }