Play Framework 框架 路由(Route)分析和总结.docx

HTTP 路 由 HTTP routing 路由组件负责将 HTTP 请求交给对应的 action 处理(一个控制器的静态公共方法) The router is the component in charge of translating incoming HTT P Requests into action calls (a static, public method of a Contro ller). 一个 HTTP 请求在 MVC 框架里被当做一个事件看待。事件包含2 个方面的信息 请求的路径(例如/clients/1524,/photos/list)，包含查询字符串(参数字符串) HTTP 方法(GET，POST,PUT,DELETE) An HTTP request is seen as an event by the MVC framework. The eve nt contains two major pieces of information: The Request path (such as /clients/1542, /photos/list), includi ng the query string. The HTTP method (GET, POST, PUT, DELETE) 关 于 REST About REST 表述性状态转移(REST)是一种类似互联网的分布式超媒体软件架构风格， Representational state transfer (REST) is a style of software arc hitecture for distributed hypermedia systems such as the World Wi de Web. REST 的几个关键性地方设计准则： 应用功能分散在资源中 每个资源使用一个唯一的 URI 来寻址 所有资源在客户端和资源之间使用一个统一的接口来转移状态 REST states a few key design principles: Application functionality is divided into resources Every resource is uniquely addressable using an URI All resources share a uniform interface for the transfer of sta te between client and resource. 如果你使用过 HTTP，这些接口定义了一些可用的HTTP 方法。这些协议用于访问资源的状态： *客户端-服务端 *无状态 *缓存 *分层 If you?re using HTTP, these interfaces are defined by the set of available HTTP methods. The protocol used to access the resource state is: Client-server Stateless Cacheable Layered 如果一个应用遵循了 REST 的主要设计准则，那么这个应用就是REST 风格的。Play 框架使构建 REST 风格的应用变得更容易： *Play 的路由解释 URI 和 HTTP 方法，将一个请求匹配给一个Java 调用。基于正则 表达式的 URI 模式匹配给你更过的灵活性。 *协议时无状态的，意味着你不能在2 次成功的请求之间在服务器上保存任何状态。 *Play 把 HTTP 当做关键特性，这样框架可以让你接触到HTTP 的所有信息。If an application follows the main REST design principles, the ap plication is RESTFul. The Play framework makes it easy to build R ESTFul applications: The Play router interprets both URI and HTTP methods to route a request to a Java call. Regular expressions-based URI patterns g ive you even more flexibility. The protocol is stateless. This means you can?t save any state on the server between two successive requests. Play considers HTTP as a