https://blog.csdn.net/u013323965/article/details/81083309
网上例子挺多
https://www.baidu.com/s?ie=utf-8&f=8&rsv_bp=1&tn=baidu&wd=%20jfinal%E5%88%86%E5%9D%97%E4%B8%8A%E4%BC%A0&oq=site%253Ajfinal.com%2520%25E5%2588%2586%25E5%259D%2597%25E4%25B8%258A%25E4%25BC%25A0&rsv_pq=c4ac445e0001f11b&rsv_t=e6b8BIb9f3h2CaUnkgpkKJb%2FtuGDEc9lyHnG8rxiW%2B%2Fox4GlJAM9%2FOq8lXg&rqlang=cn&rsv_enter=1&rsv_dl=tb&rsv_sug3=6&rsv_sug1=4&rsv_sug7=100&rsv_sug2=0&rsv_btype=t&inputT=8294&rsv_sug4=11090

@杜福忠 谢谢！