swagger官网：http://swagger.io/
swagger ui demo：http://petstore.swagger.io
让API文档总是与API定义同步更新，是一件非常有价值的事。
A Powerful Interface to your API
Swagger is a simple yet powerful representation of your RESTful API. With the largest ecosystem of API tooling on the planet, thousands of developers are supporting Swagger in almost every modern programming language and deployment environment. With a Swagger-enabled API, you get interactive documentation, client SDK generation and discoverability.
We created Swagger to help fulfill the promise of APIs. Swagger helps companies like Apigee, Getty Images, Intuit, LivingSocial, McKesson, Microsoft, Morningstar, and PayPal build the best possible services with RESTful APIs.
Now in version 2.0, Swagger is more enabling than ever. And it's 100% open source software.
