宁静的JSON Web服务：最好的方法吗？

I want to write a webservice for my android apps. It needs to be a restful JSON webservice. I am searching for the best way to do it. It needs to be fast, and not to hard to use or learn if necessary.

The options I have right now are:

• Write my own PHP restfull webservice. Example
• Use the SLIM Framework for routing my requests. Example
• Use Zend Framework 2 as base. But I find Zend slow?
• Use ASP.NET for creating the webservice. But the hosting is expensive?
• Java webservice, never used before.

So what is the best option to go for? I cannot choose which way to go? Or is there another, maybe better option that I forgot?

I have looked at al your proposals and I am going for the slim framework. But thx for all the options.

Have a look at Jello Framework (I am the author). It is an end-to-end Java framework including comprehensive Data Authorization model, a powerful RESTful engine optimized for Google App Engine.