update3

@@ -147,7 +147,7 @@ public class TiandituDownload {
                                 byte[] img2 = getTile(url2);
                                 InputStream img_stream2 = new ByteArrayInputStream(img2);
                                 BufferedImage bImageFromConvert2 = ImageIO.read(img_stream2);
-
+                                // 将两张图片拼凑为一张
                                 Graphics g = bImageFromConvert.getGraphics();
                                 g.drawImage(bImageFromConvert, 0, 0, null);
                                 g.drawImage(bImageFromConvert2, 0, 0, null);