使用http POST上传多个文件

Question

我在从iPhone应用上传FTP文件时出现问题。

我发送一个HTTP POST请求到我的webservice所有必要的参数。我发送两个文件，一个是图像，另一个是音频。图像正在上传，但音频不是。 当我跟踪我的Web服务时，它只显示图像字段作为上传的文件。这并不表明音频也在那里。

我的代码是：

NSString *urlString = [NSString stringWithFormat:ADD_LEAD_API_URL]; 

NSMutableURLRequest *postRequest = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:urlString]]; 



// change type to POST (default is GET) 
[postRequest setHTTPMethod:@"POST"]; 


// just some random text that will never occur in the body 
NSString *stringBoundary = @"0xKhTmLbOuNdArY---This_Is_ThE_BoUnDaRyy---pqo"; 

// header value 
NSString *headerBoundary = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",stringBoundary]; 

// set header 
[postRequest addValue:headerBoundary forHTTPHeaderField:@"Content-Type"]; 

// create data 
NSMutableData *postBody = [NSMutableData data]; 



[postBody appendData:[[NSString stringWithFormat:@"--%@\r\n", stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]]; 
[postBody appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"userId\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]]; 
[postBody appendData:[appDelegate.objCurrentUser.userId dataUsingEncoding:NSUTF8StringEncoding]]; 
[postBody appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];  


// message part 
[postBody appendData:[[NSString stringWithFormat:@"--%@\r\n", stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]]; 
[postBody appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"firstName\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]]; 
[postBody appendData:[firstName dataUsingEncoding:NSUTF8StringEncoding]]; 
[postBody appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]]; 

/*** My rest of string parameters are successfully added to request ***/ 


// media part 
[postBody appendData:[[NSString stringWithFormat:@"--%@\r\n", stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]]; 
[postBody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"imageUrl\"; filename=\"dummy.jpg\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]]; 
[postBody appendData:[@"Content-Type: image/jpeg\r\n" dataUsingEncoding:NSUTF8StringEncoding]]; 
[postBody appendData:[@"Content-Transfer-Encoding: binary\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]]; 
    // get the image data from main bundle directly into NSData object 

UIImage *img= leadImage; 
NSData *imageData= UIImageJPEGRepresentation(img,90); 

[postBody appendData:imageData]; 

// Image is being uploaded 

[postBody appendData:[[NSString stringWithFormat:@"--%@\r\n", stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]]; 
[postBody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"recordSoundUrl\"; filename=\"%@\"\r\n", self.recordingPath] dataUsingEncoding:NSUTF8StringEncoding]]; 
[postBody appendData:[@"Content-Type: application/octet-stream\r\n" dataUsingEncoding:NSUTF8StringEncoding]]; 
[postBody appendData:[@"Content-Transfer-Encoding: binary\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]]; 


NSData *soundData = [NSData dataWithContentsOfFile:[appDelegate.documentDir stringByAppendingPathComponent:self.recordingPath]]; 
[postBody appendData:soundData]; 
[postBody appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]]; 

// final boundary 
[postBody appendData:[[NSString stringWithFormat:@"--%@\r\n", stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]]; 

// add body to post 
[postRequest setHTTPBody:postBody]; 

// Asynch request 
NSURLConnection *conn = [NSURLConnection connectionWithRequest:postRequest delegate:self]; 

如果我不上传图片，那么它需要的音频。所以我只能发送一个包含请求的文件。 请帮我告诉我，如果我在任何地方都是错的。

在此先感谢。

Answer 1

你看过使用ASIHTTPRequest的ASINetworkQueue发送多个文件。

更新：根据以下评论，ASIHTTPRequest不再维护。请谨慎使用此框架。其他选项是MKNetworkKit或AFNetworking。

Answer 2

您可能在设置边界时遇到问题。

以此为界

NSString boundary = [NSString stringWithString:@"---------------------------14737809831466499882746641449"]; 

，并使用此

[body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]]; 

，而不是这个

[postBody appendData:[[NSString stringWithFormat:@"--%@\r\n", stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]]; 

Answer 3

这是相当简单的。只是形成多部分机构。假设你已经在“PARAMS”字典文件上传和定期PARAMS：

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString: urlString] cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:54.0]; 

NSMutableData* body = [NSMutableData data]; 

NSString* boundary = [NSString randomStringWithLength:64]; 
[request setValue:[NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary] forHTTPHeaderField:@"Content-Type"]; 
NSData *boundaryData = [[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]; 

[params enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) { 
    [body appendData:boundaryData]; 
    // I use special simple class to distinguish file params 
    if([obj isKindOfClass:[FileUpload class]]) { 
     // File upload 
     [body appendData: [[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"%@\"\r\n\r\n", key, [obj localName]] dataUsingEncoding:NSUTF8StringEncoding]]; 
     [body appendData: [obj loadData]]; // It just return NSData with loaded file in it 
     [body appendData: [@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]]; 
    } 
    else { 
     // Regular param 
     [body appendData: [[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n%@\r\n", key, obj] dataUsingEncoding:NSUTF8StringEncoding]] 
    } 
}]; 
[body appendData:[[NSString stringWithFormat:@"--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]]; 

[request setValue:[NSString stringWithFormat:@"%d", [body length]] forHTTPHeaderField:@"Content-Length"]; 
[request setHTTPBody:body]; 

现在，你可以派遣以任何方式：

[NSURLConnection sendAsynchronousRequest:request 
            queue:queueOfYourChoice 
         completionHandler:^(NSURLResponse *response, NSData *rdata, NSError *error) 

的FileUpload类是相当容易：它从构建url/filename，将该名称作为方法提供，并将二进制内容加载到NSData *中。我没有列出清楚，但如果需要，我会补充。