Symfony 2.2 - 上传文件

I am new in SYmfony and going to make a blog service with symfony2. I want to let user upload a picture and show it On his/her post. what should I do?

Use dustin10/VichUploaderBundle.

Instructions on how to use the bundle can be found in the documentation.

Further information can be found in the cookbook chapter How to handle File Uploads with Doctrine but VichUploaderBundle is the easiest way to get you started.

For image processing have a look at LiipImagineBundle.