初始化项目

bin/middleware/exception_handler.dart

@@ -0,0 +1,43 @@
+import 'package:shelf/shelf.dart';
+import 'dart:io';
+
+/// 全局异常处理中间件
+/// 捕获所有未处理的异常并返回适当的 HTTP 响应
+Middleware exceptionHandler() {
+  return (Handler innerHandler) {
+    return (Request request) async {
+      try {
+        return await innerHandler(request);
+      } on FormatException catch (e) {
+        // 处理参数格式错误，如无效的 ID
+        return Response.badRequest(
+          body: 'Invalid parameter format: ${e.message}',
+          headers: {'content-type': 'text/plain'},
+        );
+      } on PathNotFoundException catch (e) {
+        // 处理路径未找到
+        return Response.notFound('Resource not found: ${e.message}');
+      } on FileSystemException catch (e) {
+        // 处理文件系统错误
+        return Response.internalServerError(
+          body: 'File system error: ${e.message}',
+          headers: {'content-type': 'text/plain'},
+        );
+      } on Exception catch (e) {
+        // 处理其他已知异常
+        return Response.internalServerError(
+          body: 'Internal server error: ${e.toString()}',
+          headers: {'content-type': 'text/plain'},
+        );
+      } catch (e, stackTrace) {
+        // 处理未知异常
+        print('Unhandled exception: $e');
+        print('Stack trace: $stackTrace');
+        return Response.internalServerError(
+          body: 'An unexpected error occurred',
+          headers: {'content-type': 'text/plain'},
+        );
+      }
+    };
+  };
+}