spring MVC 中擷取request

spring mvc中如何擷取request 呢?

有如下方式:

方式一:在action中注入request

直接在action的參數中增加httpservletrequest request

例如

方式二:使用requestcontextholder

httpservletrequest request = ((servletrequestattributes) requestcontextholder.getrequestattributes()).getrequest();