切换方式

src/main/java/com/fdkankan/download/util/DownloadUtil.java

@@ -29,11 +29,12 @@ public class DownloadUtil {
             if(FileUtil.size(new File(path)) == 0 ){
                 while (index<=50){
                     index++;
-                    ThreadUtil.safeSleep(500);
                     DownloadUtil.downFile(url,path);
                     if (FileUtil.size(new File(path))>0){
                         return;
                     }
+                    ThreadUtil.safeSleep(500);
+
 //                    HttpUtil.downloadFileFromUrl(url,path);
                 }
             }