NSURLSession文件上传（表单提交方式）

其中需要注意的是:

[headerStrM appendFormat:@"Content-Disposition: form-data; name=%@; filename=%@\r\n",formName,reName];

需要按照后端的要求，把name填写正确。

以下是完整代码：

+ (void)httpUpload:(NSString *)urlStr filePath:(NSString *)filePath succ:(void (^)(NSDictionary *dataInfo))succ fail:(void (^)(NSError *error))fail {
    if (!urlStr || urlStr.length <= 0) {
        return;
    }
 
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:urlStr]];
    request.HTTPMethod = @"POST";
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; charset=utf-8; boundary=%@", kFHUploadFileBoundary];
    [request setValue:contentType forHTTPHeaderField:@"Content-Type"];
    
    NSString *fileNameStr = [filePath lastPathComponent];
    
    NSData *bodyData = [self getHttpBodyWithFilePath:filePath formName:@"singleFile" reName:fileNameStr];
    
    [request setHTTPBody:bodyData];
    NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];
    NSURLSession *session = [NSURLSession sessionWithConfiguration:config];
    NSURLSessionUploadTask *uploadTask = [session uploadTaskWithRequest:request fromData:nil completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {

        } else {
            
    }];
    
    [uploadTask resume];
}

/// filePath:要上传的文件路径   formName：表单控件名称  reName：上传后文件名
+ (NSData *)getHttpBodyWithFilePath:(NSString *)filePath formName:(NSString *)formName reName:(NSString *)reName {
    NSMutableData *data = [NSMutableData data];
    NSString *fileType = [self fileMIMETypeURLSessionWithPath:filePath];
    NSMutableString *headerStrM = [NSMutableString string];
    [headerStrM appendFormat:@"--%@\r\n", kFHUploadFileBoundary];
    // name：表单控件名称  filename：上传文件名
    [headerStrM appendFormat:@"Content-Disposition: form-data; name=%@; filename=%@\r\n",formName,reName];
    [headerStrM appendFormat:@"Content-Type: %@\r\n\r\n",fileType];
    [data appendData:[headerStrM dataUsingEncoding:NSUTF8StringEncoding]];
 
    // 文件内容
    NSData *fileData = [NSData dataWithContentsOfFile:filePath];
    [data appendData:fileData];
 
    NSMutableString *footerStrM = [NSMutableString stringWithFormat:@"\r\n--%@--\r\n", kFHUploadFileBoundary];
    [data appendData:[footerStrM  dataUsingEncoding:NSUTF8StringEncoding]];
    return data;
}

+ (NSString *)fileMIMETypeURLSessionWithPath:(NSString *)path {
    NSURL *url = [NSURL fileURLWithPath:path];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);
    __block NSString *mimeType = nil;
    NSURLSessionTask *task = [[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        mimeType = response.MIMEType;
        dispatch_semaphore_signal(semaphore);
    }];
    [task resume];
    dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);
    return mimeType;
}