修正钉钉手机无法展示 Base64 图片问题

src/main/java/org/yzr/service/PackageService.java

@@ -39,9 +39,12 @@ public class PackageService {
             String tempIconPath = PathManager.getTempIconPath(aPackage);
             String iconPath = packagePath + File.separator + "icon.png";
             String sourcePath = packagePath + File.separator + fileName;
+            String jpgIconPath = packagePath + File.separator + "icon.jpg";
 
             // 拷贝图标
             ImageUtils.resize(tempIconPath, iconPath, 192, 192);
+            // 生成钉钉发送所需要图片
+            ImageUtils.convertPNGToJPG(iconPath, jpgIconPath, 64, 64);
             // 源文件
             FileUtils.copyFile(new File(filePath), new File(sourcePath));
 

src/main/java/org/yzr/utils/ImageUtils.java

@@ -58,4 +58,33 @@ public class ImageUtils {
             e.printStackTrace();
         }
     }
+
+    /**
+     * 将 PNG 转为 JPG 并指定图片大小
+     * @param soureFilePath
+     * @param targetFilePath
+     * @param width
+     * @param height
+     */
+    public static void convertPNGToJPG(String soureFilePath, String targetFilePath, int width, int height) {
+        try {
+            //read image file
+            BufferedImage bufferedImage = ImageIO.read(new File(soureFilePath));
+            Image tmp = bufferedImage.getScaledInstance(width, height, Image.SCALE_SMOOTH);
+            // create a blank, RGB, same width and height, and a white background
+            if (width <= 0 || height <= 0) {
+                width = bufferedImage.getWidth();
+                height = bufferedImage.getHeight();
+            }
+            BufferedImage newBufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
+            //TYPE_INT_RGB:创建一个RBG图像，24位深度，成功将32位图转化成24位
+
+            newBufferedImage.createGraphics().drawImage(tmp, 0, 0, Color.WHITE, null);
+
+            // write to jpeg file
+            ImageIO.write(newBufferedImage, "jpg", new File(targetFilePath));
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
 }

src/main/java/org/yzr/utils/webhook/DingDingWebHook.java

@@ -54,8 +54,8 @@ public class DingDingWebHook implements IWebHook {
 
         String appInfo = String.format("[%s(%s)更新](%s)", app.getName(), platform, url);
         // 将图片转为 base64, 内网 ip 钉钉无法访问，直接给图片数据
-        String iconPath = PathManager.getFullPath(app.getCurrentPackage())  + "icon.png";
-        String icon = "data:image/png;base64," + ImageUtils.convertImageToBase64(iconPath);
+        String iconPath = PathManager.getFullPath(app.getCurrentPackage())  + "icon.jpg";
+        String icon = "data:image/jpg;base64," + ImageUtils.convertImageToBase64(iconPath);
         String pathInfo = String.format("![%s](%s)", app.getName(), icon);
         String otherInfo = String.format("链接：[%s](%s) \n\n 版本：%s (Build: %s)", url, url, app.getCurrentPackage().getVersion(), app.getCurrentPackage().getBuildVersion());
         String text = appInfo + " \n\n " + pathInfo + " \n\n " + otherInfo;