IOS development and ios development tutorial

IOS development and ios development tutorial
File Upload steps

1. Set request headers
* Purpose: to tell the server that the content in the Request body is not a common parameter, but contains a file parameter.

[request setValue:@"multipart/form-data; boundary=maljob" forHTTPHeaderField:@"Content-Type"];

2. Set the Request body
* Function: stores parameters (File parameters and non-file parameters)
1> non-file Parameters

[body appendData:MalJobEncode(@"--maljob\r\n")];[body appendData:MalJobEncode(@"Content-Disposition: form-data; name=\"username\"\r\n")];

[Body appendData: MalJobEncode (@ "\ r \ n")]; [body appendData: MalJobEncode (@ "Zhang San")]; [body appendData: malJobEncode (@ "\ r \ n")];

2> file Parameters

[body appendData:MalJobEncode(@"--heima\r\n")];[body appendData:MalJobEncode(@"Content-Disposition: form-data; name=\"file\"; filename=\"test123.png\"\r\n")];[body appendData:MalJobEncode(@"Content-Type: image/png\r\n")];

[body appendData:MalJobEncode(@"\r\n")];[body appendData:imageData];[body appendData:MalJobEncode(@"\r\n")];

3> end mark: Mark of parameter end

[body appendData:MalJobEncode(@"--maljob--\r\n")];

File MIMEType

1. Baidu search

2. Search for an xml file under the server

apache-tomcat-6.0.41\conf\web.xml

3. Get it through Reponse when loading the file

-(NSString *) MIMEType :( NSURL *) url {// 1. create a request NSURLRequest * request = [NSURLRequest requestWithURL: url]; // 2. send a request (response) NSURLResponse * response = nil; [NSURLConnection sendSynchronousRequest: request returningResponse: & response error: nil]; // 3. obtain MIMEType return response. MIMEType ;}

File Upload and encapsulation tools

@ Interface UploadTool: NSObject/*** obtain the MIMEType of the file based on the file path ** @ param url file path ** @ return file MIMEType */-(NSString *) MIMEType :( NSURL *) url; /*** upload a file based on the file name, MIMEType, binary file, and other parameters ** @ param filename file name * @ param mimeType MIMEType * @ param fileData binary file * @ param params non-File other detailed parameters */-(void) upload :( NSString *) filename mimeType :( NSString *) mimeType fileData :( NSData *) fileData params :( NSDictionary *) params; @ end

# Define MJFileBoundary @ "MalJob" # define MJNewLine @ "\ r \ n" # define MJEncode (str) [str dataUsingEncoding: NSUTF8StringEncoding] # import "UploadTool. h "@ implementation UploadTool-(NSString *) MIMEType :( NSURL *) url {// 1. create a request NSURLRequest * request = [NSURLRequest requestWithURL: url]; // 2. send a request (response) NSURLResponse * response = nil; [NSURLConnection sendSynchronousRequest: request returningResponse: & response error: nil]; // 3. obtain MIMEType return response. MIMEType;}-(void) upload :( NSString *) filename mimeType :( NSString *) mimeType fileData :( NSData *) fileData params :( NSDictionary *) params {// 1. request Path NSURL * url = [NSURL URLWithString: @ "http: // 218.83.161.124: 8080/job/upload"]; // 2. create a POST request NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL: url]; request. HTTPMethod = @ "POST"; // 3. set the Request body NSMutableData * body = [NSMutableData data]; // 3. 1. file parameter [body appendData: MJEncode (@ "--")]; [body appendData: MJEncode (MJFileBoundary)]; [body appendData: MJEncode (MJNewLine)]; NSString * disposition = [NSString stringWithFormat: @ "Content-Disposition: form-data; name = \" file \ "; filename = \" % @ \ "", filename]; [body appendData: MJEncode (disposition)]; [body appendData: MJEncode (MJNewLine)]; NSString * type = [NSString stringWithFormat: @ "Content-Type: % @", mimeType]; [body appendData: MJEncode (type)]; [body appendData: MJEncode (MJNewLine)]; [body appendData: MJEncode (MJNewLine)]; [body appendData: fileData]; [body appendData: MJEncode (MJNewLine)]; // 3. 2. non-file parameter [params enumerateKeysAndObjectsUsingBlock: ^ (id key, id obj, BOOL * stop) {[body appendData: MJEncode (@ "--")]; [body appendData: MJEncode (MJFileBoundary)]; [body appendData: MJEncode (MJNewLine)]; NSString * disposition = [NSString stringWithFormat: @ "Content-Disposition: form-data; name = \ "% @ \" ", key]; [body appendData: MJEncode (disposition)]; [body appendData: MJEncode (MJNewLine)]; [body appendData: MJEncode (MJNewLine)]; [body appendData: MJEncode ([obj description])]; [body appendData: MJEncode (MJNewLine)] ;}]; // 3. 3. end tag [body appendData: MJEncode (@ "--")]; [body appendData: MJEncode (MJFileBoundary)]; [body appendData: MJEncode (@ "--")]; [body appendData: MJEncode (MJNewLine)]; request. HTTPBody = body; // 4. set the Request Header (telling the server that the file data is sent to you this time, and telling the server that a file upload request is sent now) NSString * contentType = [NSString stringWithFormat: @ "multipart/form-data; boundary = % @", MJFileBoundary]; [request setValue: contentType forHTTPHeaderField: @ "Content-Type"]; // 5. send request [NSURLConnection failed: request queue: [inclumainqueue] completionHandler: ^ (NSURLResponse * response, NSData * data, NSError * connectionError) {NSDictionary * dict = [NSJSONSerialization failed: data options: NSJSONReadingMutableLeaves error: nil]; MalJobLog (@ "% @", dict) ;}] ;}- (void) upload {// other non-file detailed parameters NSDictionary * params = @{@"":@"",@"":@"",}; NSURL * url = [[NSBundle mainBundle] URLForResource: @ "filename" withExtension: @ "txt"]; NSData * data = [NSData dataWithContentsOfURL: url]; NSString * MIMEType = [self MIMEType: url]; [self upload: @ "filename.txt" mimeType: MIMEType fileData: data params: params];}