关于POST，新手不懂，求老司机指点

2424544044

例如需要POST的网址是：http://www.loongair.cn/Flight/InterfaceService
例如需要POST的数据是：{"ActionType":1,"SessionId":"","Args":"{\"SaleChannel\":1,\"AirportFrom\":\"HGH\",\"AirportTo\":\"PEK\",\"DepartureTime\":\"2017-03-08\"}"}
请求头是：
Host: www.loongair.cn
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:51.0) Gecko/20100101 Firefox/51.0
Accept: application/json, text/plain, */*
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Content-Type: application/json; charset=UTF-8
Referer: http://www.loongair.cn/ETicket/AirlineList.html
Content-Length: 139
Cookie: Hm_lvt_e8c7c9234645588a511ef8fc3bd3bf62=1488761326,1488766738; Hm_lpvt_e8c7c9234645588a511ef8fc3bd3bf62=1488766741; TransData_BackUrl=http%3A%2F%2Fwww.loongair.cn%2FETicket%2FAirlineList.html; TransData_QueryTicket=%7B%22CabinInfoList%22%3A%5B%5D%2C%22ChildCabinInfos%22%3A%5B%5D%2C%22AirportFrom%22%3A%22HGH%22%2C%22AirportTo%22%3A%22PEK%22%2C%22AirportFromCH%22%3A%22%E6%9D%AD%E5%B7%9E%22%2C%22AirportToCH%22%3A%22%E5%8C%97%E4%BA%AC%22%2C%22DepartureTime%22%3A%222017-03-07%22%2C%22RoundTripTime%22%3A%222017-03-09%22%2C%22RoundTrip%22%3Afalse%7D; SessionID=3430cbedb864407d8bc87e74eb230a9c
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache

那么我们TC的POST的代码需要如何编写，新手测试了N次，始终不会，求高手帮忙，万分感谢！

baby杰杰

post很复杂，让人很头痛