如何为现有表创建Liferay JSON Web服务? [英] How to create Liferay JSON web service for existing tables?

问题描述

我正在开发一个移动应用程序，该应用程序可以从基于Liferay的门户检索数据.我正在使用JSON Web服务来访问数据，例如博客条目.如何为现有表制作新的Web服务?我发现的每个教程都以一个新实体(即数据库表)的定义开始，但是我不需要.我只想以系统ws无法提供的方式访问现有数据，例如过滤具有特定结构的Web内容.

I am developing a mobile app which retrieves data from a Liferay-based portal. I am using JSON web services to access the data which works well for e.g. Blog Entries. How can I make a new web service for existing tables? Each tutorial I have found starts with the definition of a new entity (i.e. database table), but I don't need that. I just want to access existing data in such a way which is not provided by system ws, e.g. to filter web content which have a specific structure.

注意:我也尝试了一种解决方法，我设法做出了一个struts动作，该动作打印出所需的JSON数据并返回null.在浏览器中输入操作的地址时，会看到JSON字符串.但是，如果将其放在移动应用程序中，则会看到一个HTML代码，似乎它已被重定向到门户的主页.

Note: I tried also a workaround, I managed to make a struts action which prints out the desired JSON data and returns null. When I enter the address for the action in a browser, I see the JSON string. But if I put it in my mobile app, I see an HTML code, it seems that it is redirected to the home page of the portal.

推荐答案

如果您不想使用servicebuilder定义新的实体，可以使用整洁的技巧:只需将该实体留空，即可定义一个类型，但不定义任何字段，例如没有基础表.然后，通过委派任何您想要访问的持久性(甚至没有任何持久性)来实现您的方法.

Neat trick if you don't want to define a new entity with servicebuilder: Just leave the entity empty, this defines just a type, but no fields, e.g. no underlying table. Then implement your methods by just delegating to whatever persistence you'd like to access (or even without any persistence).

  <Entity name="Foo" local-service="true" remote-service="true">
  </Entity>

这将创建FooServiceImpl和FooLocalServiceImpl，可用于实现业务逻辑，而无需附加任何数据库表.

This will create FooServiceImpl and FooLocalServiceImpl that you can use to implement your business logic, without any attached database table.

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