1、HTTP 只有POST和GET 两种命令模式；
2、POST是被设计用来向上放东西的，而GET是被设计用来从服务器取东西的，GET也能够向服务器传送较少的数据，而Get之所以也能传送数据,只是用来设计告诉服务器,你到底需要什么样的数据.POST的信息作为HTTP 请求的内容，而GET是在HTTP 头部传输的；
3、POST与GET在HTTP 中传送的方式不同，GET的参数是在HTTP 的头部传送的，而Post的数据则是在HTTP 请求的内容里传送;
4、POST传输数据时，不需要在URL中显示出来，而GET方法要在URL中显示；
5、GET方法由于受到URL长度的限制,只能传递大约1024字节；POST传输的数据量大，可以达到2M，而根据微软方面的说法，微软对用 Request.Form() 可接收的最大数据有限制，IIS 4 中为 80 KB 字节，IIS 5 中为 100 KB 字节；
6、SOAP是依赖于HTTP POST模式实现的；
例子：
HTTP GET
发送
GET /DEMOWebServices2.8/Service.asmx/CancelOrder?UserID=string&PWD=string&OrderConfirmation=string HTTP/1.1Host: api.efxnow.com
回复
HTTP/1.1 200 OKContent-Type: text/xml; charset=utf-8Content-Length: length
<?xml version="1.0" encoding="utf-8"?><objPlaceOrderResponse xmlns="https://api.efxnow.com/webservices2.3"> <Success>boolean</Success> <ErrorDescription>string</ErrorDescription> <ErrorNumber>int</ErrorNumber> <CustomerOrderReference>long</CustomerOrderReference> <OrderConfirmation>string</OrderConfirmation> <CustomerDealRef>string</CustomerDealRef></objPlaceOrderResponse>
HTTP POST
发送
POST /DEMOWebServices2.8/Service.asmx/CancelOrder HTTP/1.1Host: api.efxnow.comContent-Type: application/x-www-form-urlencodedContent-Length: length
UserID=string&PWD=string&OrderConfirmation=string
回复
HTTP/1.1 200 OKContent-Type: text/xml; charset=utf-8Content-Length: length
<?xml version="1.0" encoding="utf-8"?><objPlaceOrderResponse xmlns="https://api.efxnow.com/webservices2.3"> <Success>boolean</Success> <ErrorDescription>string</ErrorDescription> <ErrorNumber>int</ErrorNumber> <CustomerOrderReference>long</CustomerOrderReference> <OrderConfirmation>string</OrderConfirmation> <CustomerDealRef>string</CustomerDealRef></objPlaceOrderResponse>
SOAP 1.2
发送
POST /DEMOWebServices2.8/Service.asmx HTTP/1.1Host: api.efxnow.comContent-Type: application/soap+xml; charset=utf-8Content-Length: length
<?xml version="1.0" encoding="utf-8"?><soap12:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"xmlns:soap12="http://www.w3.org/2003/05/soap-envelope"> <soap12:Body> <CancelOrder xmlns="https://api.efxnow.com/webservices2.3"> <UserID>string</UserID> <PWD>string</PWD> <OrderConfirmation>string</OrderConfirmation> </CancelOrder> </soap12:Body></soap12:Envelope>
回复
HTTP/1.1 200 OKContent-Type: application/soap+xml; charset=utf-8Content-Length: length
<?xml version="1.0" encoding="utf-8"?><soap12:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"xmlns:soap12="http://www.w3.org/2003/05/soap-envelope"> <soap12:Body> <CancelOrderResponse xmlns="https://api.efxnow.com/webservices2.3"> <CancelOrderResult> <Success>boolean</Success> <ErrorDescription>string</ErrorDescription> <ErrorNumber>int</ErrorNumber> <CustomerOrderReference>long</CustomerOrderReference> <OrderConfirmation>string</OrderConfirmation> <CustomerDealRef>string</CustomerDealRef> </CancelOrderResult> </CancelOrderResponse> </soap12:Body></soap12:Envelope>
转载于:https://www.cnblogs.com/jingdian1956/p/3266502.html
相关资源：httppost和httpget需要的jar包