iOS Network Development Basics-How to send data to the server

There are three ways to send data to the server: nsurlrequest,nsmutableurlrequest,nsurlconnection

Nsurlrequest sending a synchronous or asynchronous request to the server

Example: How to send a GET Request

* The default is GET Request

1.URL

Nsurl *url = [Nsurl urlwithstring:@ "http://www.baidu.com"];

//2. Request

Nsurlrequest *request = [Nsurlrequest Requestwithurl:url];

//3. Send Request

[Nsurlconnection sendasynchronousrequest:request queue:[nsoperationqueue Mainqueue] completionHandler:^ ( Nsurlresponse *response, NSData *data, Nserror *connectionerror) {

}];

Second, Nsmutableurlrequest send the request to the server

How to send a POST Request

//1. Create a URL : Request Path

Nsurl *url = [Nsurl urlwithstring:@ "Http://xxxxxx/login"];

//2. Create a request

Nsmutableurlrequest *request = [Nsmutableurlrequest Requestwithurl:url];

// Set Request Method

request. HttpMethod = @ "POST";

// set the request body : Request Parameters

nsstring *param = [NSString stringWithFormat:@ "username=%@&pwd=%@", Usernametext, Pwdtext] ;

NSString-NSData

Request. Httpbody = [param datausingencoding:nsutf8stringencoding];

Iii. Nsurlconnection sending a request to the server

Use nsurlconnection basic steps to send a request

//1. Create an NS URL Object : Request Request Path

Nsurl *url = [Nsurl urlwithstring:@ "http://4234324/5345345"];

//2. Incoming Nsurl Create a Nsurlrequest object, set the request header and the request body

Nsurlrequest *request = [Nsurlrequest Requestwithurl:url];

//3. Send nsurlrequest using nsurlconnection Request

[Nsurlconnection sendasynchronousrequest:request queue:queue Completionhandler:

^ (Nsurlresponse *response, NSData *data, Nserror *connectionerror) {

//4. Processing the data returned by the server

}];

1. Send a sync request

+ (nsdata *) Sendsynchronousrequest: (nsurlrequest*) Request Returningresponse: (nsurlresponse * *) Response error: (nserror* *) error;

2. Send asynchronous request---is divided into block callback and Nsurlconnectiondelegate proxy method according to different processing method of server return data

• Block callback
  

+ (void) sendasynchronousrequest: (nsurlrequest*) Request

Queue: (nsoperationqueue*) queue

Completionhandler: ( void (^) (nsurlresponse* response, nsdata* data, nserror* connectionerror)) handler

• Request: Requests that need to be sent
• Queue: Generally use the home row, storage handler this task
• Handler: When the request is complete, the block is automatically called

• Proxy methods in the Nsurlconnectiondelegate protocol

called when a response to the server starts to be received

-(void) connection: (nsurlconnection*) connection didreceiveresponse: (nsurlresponse*) Response

called when the data returned by the server is received (the data returned by the server is larger when it is called multiple times)

-(void) connection: (nsurlconnection*) connection didreceivedata: (nsdata*) data;

called when the data returned by the server is fully received

-(void) connectiondidfinishloading: (nsurlconnection*) connection;

call when request is faulted (e.g. request timed out)

-(void) connection: (nsurlconnection*) connection didfailwitherror: (nserror*) error;

D. Send JSON to the server

1. Be sure to use the POST request

2. Set the request header:

[Request setvalue:@ "Application/json" forhttpheaderfield:@ "Content-type"];

3. Set the JSON data as the request body

iOS Network Development Basics-How to send data to the server