iOS Development Network-send JSON data to server and multivalued parameters

First, send JSON data to the server

Steps to send JSON data to the server:

(1) Be sure to use the POST request

(2) Set the request header

(3) Set the JSON data as the request body

code example:

1 #import "YYViewController.h"2 3 @interfaceYyviewcontroller ()4 5 @end6 7 @implementationYyviewcontroller8 9- (void) ViewdidloadTen { One [Super Viewdidload]; A } -  -- (void) Touchesbegan: (Nsset *) touches withevent: (Uievent *)Event the { -     //1. Create a request -Nsurl *url = [Nsurl urlwithstring:@"Http://192.168.1.200:8080/MJServer/order"]; -Nsmutableurlrequest *request =[Nsmutableurlrequest Requestwithurl:url]; +Request. HttpMethod =@"POST"; -      +     //2. Set the request header A[Request SetValue:@"Application/json"Forhttpheaderfield:@"Content-type"]; at      -     //3. set the request body  -Nsdictionary *json = @{ -                            @"order_id":@"123", -                            @"user_id":@"789", -                            @" Shop":@"Toll" in                            }; -      to //NSData-Nsdictionary +     //nsdictionary-NSData -NSData *data =[nsjsonserialization Datawithjsonobject:json options:nsjsonwritingprettyprinted Error:nil]; theRequest. Httpbody =data; *      $     //4. Sending the requestPanax Notoginseng     [nsurlconnection sendasynchronousrequest:request queue:[nsoperationqueue Mainqueue] completionHandler:^ ( Nsurlresponse *response, NSData *data, Nserror *connectionerror) { -NSLog (@"%d", data.length); the     }]; + } A  the @end

Two, multi-value parameters

Multivalued parameter: One parameter corresponds to multiple values.

Request parameters such as the following:

Http://192.168.1.103:8080/MJServer/weather?place= Beijing &place= Henan &place= Hunan

The place property of the server is an array. Therefore, using the same parameter does not overwrite the value of the server.

iOS Development Network-send JSON data to server and multivalued parameters