视图的职责是基于模型渲染真正的内容响应给客户端，同时还需要告诉浏览器内容类型 content-type。

定义

  1. export interface View {
  2.     readonly contentType: string;
  3.     render(model: any): Promise<void>;
  4.     support(viewName: string): Promise<boolean>;
  5. }

实现

  2. @Component(View)
  3. export class JsonView implements View {
  5.     static VIEW_NAME = 'json';
  7.     readonly contentType = 'application/json';
  9.     readonly priority = 500;
  11.     async render(model: any): Promise<void> {
  12.         const response = Context.getCurrent().response;
  13.         response.body = JSON.stringify(model);
  14.     }
  16.     support(viewName: string): Promise<boolean> {
  17.         return Promise.resolve(viewName === JsonView.VIEW_NAME);
  18.     }
  19. }

使用

  1. @Controller('users')
  2. export class UserController {
  4.     @Get(':id')
  5.     @View(JsonView.VIEW_NAME)
  6.       get(@Param() id: string) {
  7.         ...
  8.     } 
  9. }