当对应文件找不到的时候，尝试通过gid查找文件

src/main/java/lion/MultiThreadedHTTPServer.java

@@ -69,9 +69,29 @@ public class MultiThreadedHTTPServer {
                             file = new File("/root/abc");
                         }else {
                             String name = path.substring(0, path.lastIndexOf('.'));
-                            System.out.println(name);
+                            name = filePath + name + "/" + name + ".zip";
-                            filePath += (name + "/" + name + ".zip");
+                            file = new File(name);
-                            file = new File(filePath);
+
+                            //该文件不存在
+                            if(!file.isFile()){
+                                String gid = paramMap.get("gid");
+
+                                //文件不存在的情况下gid也不存在，直接404
+                                if(gid == null)
+                                    file = new File("/root/abc");
+
+                                //gid存在的情况下尝试查找对应的文件
+                                else {
+                                    File[] galleryDirectories = (new File(filePath)).listFiles();
+
+                                    assert galleryDirectories != null;
+                                    for (File galleryDirectory : galleryDirectories)
+                                        if (galleryDirectory.getName().contains(gid)) {
+                                            file = new File(galleryDirectory.getAbsolutePath(), galleryDirectory.getName() + ".zip");
+                                            break;
+                                        }
+                                }
+                            }
                         }
                     }
                 else{