Comparison of Get and post

GET Login

- (void) GetLogin {NSString *urlstring = [NSString stringWithFormat:@ "http://localhost/login.php?username=%@&password=%@",Self. Username,Self. pwd];Nsurl *url = [Nsurl Urlwithstring:urlstring];nsurlrequest *request = [nsurlrequest RequestWithURL:url Cachepolicy:nsurlrequestreturncachedatadontload timeoutinterval:10.0]; //default is the GET method, no need to specifically specify nslog (@ "%@" , Requestnsurlconnection sendasynchronousrequest:request queue:[nsoperationqueue MainQueue] completionhandler:^ (Nsurlresponse *response, nsdata *data, nserror *connectionerror) {id result = [nsjsonserialization jsonobjectwithdata:data options: 0 error:null]; nslog (@ "%@-%@", response, result);}];}    

Basic format for URLs

• Logon script: login.php , hint: in different companies using the background interface is not the same jsp , aspx ...
• If you want to take parameters, use the ? join
• Parameter format:参数名=值
• If there are multiple parameters, use the & connection

GET Cache

• The get cache data is saved in the cache directory under \bundleid Cache.db
  • cfurl_cache_receiver_data, all request data is cached
  • cfurl_cache_response, all responses are cached

The above operation is only for demonstration, the content will be explained in follow-up SQLite

POST Login

- (void) Postlogin {Nsurl *url = [Nsurl URLWithString:@ "http://localhost/login.php"];    Nsmutableurlrequest *request = [Nsmutableurlrequest Requestwithurl:url]; Request. HttpMethod =@ "POsT";NSString *BODYSTR = [nsstring stringWithFormat:@ "username=%@&password=%@", self. Username, self. pwd]; Request. Httpbody = [Bodystr datausingencoding:nsutf8stringencoding]; [nsurlconnection sendasynchronousrequest:request queue:[nsoperationqueue Mainqueue] completionHandler:^ ( Nsurlresponse *response, nsdata *data, nserror *connectionerror) { id result = [nsjsonserialization JSONObje Ctwithdata:data options:0 Error:NULL]; NSLog (@ "%@-%@", response, result);}];}             

GET & POST Compare URLs

• GET-Real changes are in the URL

  • URL format
    • Login.php is responsible for login script (hint, server script can have many kinds, PHP is used in class)
    • If the parameter is connected, use the?
    • parameter format, value pairs:参数名=值
    • Multiple parameters, using the & connection
    • If you URL have special characters such as Chinese/white space in the string, you need to add percent escape

      [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

• POST

  • URLDoes not contain any parameters, you can specify the script path directly

Request

• Get-is the most frequently used method of network access, the default way to get data from the server URLRequest isGET

  • No need to make any changes

• POST

  • You need to specify an access method for HTTP:POST
  • All data parameters are specified in the data body, and the data contents can be Firebug pasted from the
  • GETthe parameter definitions for data formats and methods are very similar, without?

Connection

• will be sent to the 请求 server
• Returns the binary data entity of the server
• Is the most simple method in network access.
• GET POST No change, no matter how it is Connection

Comparison of Get and post