iOS Development Web-File upload

When a file is uploaded, the POST request is used, and the data to be uploaded is usually stored in the request body. This article describes how to implement a file upload in iOS development without the help of a third-party framework.

Because of the complexity of the process, only some of the key code is posted.

Key code for the host controller:

Yyviewcontroller.m

 1 #import "YYViewController.h" 2 3 #define YYENCODE (str) [STR datausingencoding:nsutf8stringencoding] 4 5 @interface YY Viewcontroller () 6 7 @end 8 9 @implementation YYViewController10-(void) viewDidLoad12 {[Super viewdidload];1 4/additional setup after loading the view, typically from a nib.15}16-(void) Upload: (NSString *) name fi Lename: (NSString *) filename mimeType: (NSString *) mimeType data: (NSData *) data parmas: (Nsdictionary *) params18 {19//) Piece upload Nsurl *url = [Nsurl urlwithstring:@ "Http://192.168.1.200:8080/YYServer/upload"];21 nsmutableurlrequest *requ EST = [nsmutableurlrequest requestwithurl:url];22 request. HttpMethod = @ "POST"; 23 24//Set request body nsmutabledata *body = [Nsmutabledata data];26 27/**************      * File parameter ***************/28//parameter start flag [body Appenddata:yyencode (@ "--yy\r\n")];30//Name: Specify parameter name (must be consistent with server side) 31 FileName: file name nsstring *disposition = [NSString stringwithformat:@ "CoNtent-disposition:form-data; Name=\ "%@\"; Filename=\ "%@\" \ r \ n ", name, filename];33 [body appenddata:yyencode (disposition)];34 nsstring *type = [NSString str ingwithformat:@ "Content-type:%@\r\n", mimetype];35 [Body appenddata:yyencode (Type)];36 Notoginseng [Body appenddata:yy Encode (@ "\ r \ n")];38 [Body appenddata:data];39 [Body appenddata:yyencode (@ "\ r \ n")];40 41/*************** Normal         Parameter ***************/42 [params enumeratekeysandobjectsusingblock:^ (ID key, id obj, BOOL *stop) {43//Parameter start flag 44 [Body Appenddata:yyencode (@ "--yy\r\n")];45 nsstring *disposition = [NSString stringwithformat:@ "Content-Di Sposition:form-data; Name=\ "%@\" \ r \ n ", key];46 [body appenddata:yyencode (disposition)];47 [body appenddata:yyencode (@" \ r \ n ") ];49 [Body appenddata:yyencode (obj)];50 [body appenddata:yyencode (@ "\ r \ n")];51}];52 53/***** Parameter end ***************/54//Yy--\r\n55 [Body appenddata:yyencode (@ "--yy--\r\n")];56 request. Httpbody = body;57 58//Set Request header 59//Request body length [request setvalue:[nsstring stringwithformat:@ "%zd", Body.len Gth] forhttpheaderfield:@ "content-length"];61//Declare this post request is a file upload [request setvalue:@] multipart/form-data; bound Ary=yy "forhttpheaderfield:@" Content-type "];63 64//Send request [nsurlconnection sendasynchronousrequest:request Q Ueue:[nsoperationqueue Mainqueue] completionhandler:^ (nsurlresponse *response, NSData *data, NSError *connectionError {if (data) {nsdictionary *dict = [Nsjsonserialization jsonobjectwithdata:data options:nsjsonre         Adingmutableleaves error:nil];68 NSLog (@ "%@", dict), or else {NSLog (@ "upload failed"); 71 }72}];73}74-(void) Touchesbegan: (Nsset *) touches withevent: (uievent *) event76 {//Socket Implementation Breakpoint upload 78 7   9//apache-tomcat-6.0.41/conf/web.xml Find File MimeType80//UIImage *image = [UIImage imagenamed:@ "test"];81// NSData *filedata = uiimagepngrepresentation (image); [Self upload:@ "file" filename:@ "Test.png" mimetype:@ "image/pn G "Data:filedata parmas:@{@" username ": @" 123 "}];83 84//Send a request to a local file. nsurl *fileurl = [[NSBundle mainbundle      ] urlforresource:@ "Itcast.txt" withextension:nil];86 nsurlrequest *request = [Nsurlrequest requestwithurl:fileurl];87 Nsurlresponse *repsonse = nil;88 NSData *data = [Nsurlconnection sendsynchronousrequest:request returningResponse : &repsonse error:nil];89 90//Get mimeType91 NSLog (@ "%@", repsonse. MIMEType); [Self upload:@ "file" filename:@ "Itcast.txt" mimetype:repsonse.                                                                                               MIMEType Data:data parmas:@{93 @ "username": @ "999", 94 @ ' type ': @ ' XML '}];95}96 @end

Additional notes:

File upload request data format

MimeType of some files

iOS Development Web-File upload