iOS Network-nsurlconnection Simple Introduction

GET request

Sync Request (Get-sendsync)
(1) Steps
1 Setting the Request path
2 Create Request object (default is GET request, and the request header is already included by default)
3 Sending network requests using the Nsurlsession Sendsync method
4 after receiving the response from the server, parse the response body

(2) Related code

//1. Determine the request path//protocol Header + host address + interface name +?+ parameter 1& parameter 2& parameter 3Nsurl *url = [Nsurl urlwithstring:@"Http://120.25.226.186:32812/login?username=520it&pwd=520it&type=JSON"]; //2. Create a Request Object | GET//the request header is already included by default | Request Method (GET)Nsurlrequest *request =[[Nsurlrequest Alloc]initwithurl:url]; //3. Send Request (GET)//synchronization requests, blocking threads    /*first parameter: Request object second parameter: response header third parameter: Error message return value: NSData Type, response body information*/Nserror*error =Nil; Nsurlresponse*response =Nil; NSData*data = [Nsurlconnection sendsynchronousrequest:request returningresponse:&response error:&ERROR]; //4. Parsing Data    if(Error = =Nil) {NSLog (@"%@", [[NSString Alloc]initwithdata:data encoding:nsutf8stringencoding]); NSLog (@"%@---%@", Response,error); }

Asynchronous request (Get-sendasync)

(1) Related instructions
The method does not get stuck on the current thread, and the network request task is executed asynchronously

(2) Related code

    //1. Determine the request path//protocol Header + host address + interface name +?+ parameter 1& parameter 2& parameter 3Nsurl *url = [Nsurl urlwithstring:@"Http://120.25.226.186:32812/login?username=888&pwd=520it&type=JSON"]; //2. Create a Request Object | GET//the request header is already included by default | Request Method (GET)Nsurlrequest *request =[[Nsurlrequest Alloc]initwithurl:url]; //3. Sending an asynchronous request    /*first parameter: The second parameter of the Request object: queue, which determines which thread the block calls the third parameter: Completionhandler execute response when the request finishes (Success | failed): response header D ATA: Response body Information connectionerror: Error message*/[Nsurlconnection SendAs
Ynchronousrequest:request queue:[nsoperationqueue Mainqueue] Completionhandler:^ (Nsurlresponse * _nullable response, NSData * _nullable data, Nserror *_nullable Connectionerror) {        //4. Parsing DataNSLog (@"%@", [[NSString Alloc]initwithdata:data encoding:nsutf8stringencoding]); }];

Asynchronous request (get-proxy)
(1) Steps
1 Determining the request path
2 Creating a Request object
3 Creating a Nsurlconnection object and setting up the proxy
4 comply with the Nsurlconnectiondatadelegate protocol and implement the appropriate proxy method
5 Listening for network request responses in Agent methods
(2) Several methods of setting up the agent

//1. Determine the request pathNsurl *url = [Nsurl urlwithstring:@"Http://120.25.226.186:32812/login?username=520it&pwd=520it&type=JSON"]; //2. Create a Request objectNsurlrequest *request =[Nsurlrequest Requestwithurl:url]; //3. Setting up the agent//the first way , the method automatically sends a network request    //nsurlconnection *connect = [[Nsurlconnection alloc]initwithrequest:request delegate:self]; //the second way, ibid.//[Nsurlconnection connectionwithrequest:request delegate:self]; //The third method of    /*first parameter: The second parameter of the Request object: Who becomes the agent the third parameter: startimmediately: Whether to start sending network requests immediately*/nsurlconnection*connect = [[Nsurlconnection alloc]initwithrequest:requestDelegate: Self startimmediately:no];
[connect start];     //[connect cancel];#pragmaMark-nsurlconnectiondatadelegate//1. Called when receiving a response from the server: Response (response header)-(void) Connection: (Nsurlconnection *) connection didreceiveresponse: (Nsurlresponse *) response{Self.filedata=[Nsmutabledata data]; NSLog (@"Didreceiveresponse");}//2. Called when the server returns data (will be called multiple times)-(void) Connection: (Nsurlconnection *) connection didreceivedata: (NSData *) data{NSLog (@"didreceivedata---%zd", data.length); //Stitching Data[Self.filedata appenddata:data];}//3. Call when the request fails-(void) Connection: (Nsurlconnection *) connection didfailwitherror: (Nserror *) error{NSLog (@"Didfailwitherror");}//4. Call when the request finishes (Success | failed)-(void) Connectiondidfinishloading: (Nsurlconnection *) connection{NSLog (@"connectiondidfinishloading"); //parsing DataNSLog (@"%@", [[NSString Alloc]initwithdata:self.filedata encoding:nsutf8stringencoding]);}

POST request

(1) Send POST request step

A. Determining the URL path
B. Creating a Request object (Mutable object)
C. Modify the Request object by post, set the request body (Data)
D. Sending an asynchronous request
E. Add: Set request timeout, handle error message, set request header (such as Get client version etc, request header can be set not set)

(2) Related code

    //1. Determine the request pathNsurl *url = [Nsurl urlwithstring:@"Http://120.25.226.186:32812/login"]; //2. Create a Request objectNsmutableurlrequest *request =[Nsmutableurlrequest Requestwithurl:url]; //2.1 Change Request MethodRequest. HttpMethod =@"POST"; //2.2 Setting the request bodyRequest. Httpbody = [@"username=520it&pwd=520it"datausingencoding:nsutf8stringencoding]; //2.3 Request timed outRequest.timeoutinterval =5; //2.4 Setting the request header[Request SetValue:@"iOS 9.0"Forhttpheaderfield:@"user-agent"]; //3. Sending the request[Nsurlconnection sendasynchronousrequest:request queue:[nsoperationqueue Mainqueue] completionHandler:^ ( Nsurlresponse * __nullable response, NSData * __nullable data, Nserror *__nullable Connectionerror) {    //4. Parsing the data returned by the server        if(connectionerror) {NSLog (@"-- request failed-"); }Else{NSLog (@"%@", [[NSString Alloc]initwithdata:data encoding:nsutf8stringencoding]); }    }];

iOS Network-nsurlconnection Simple Introduction