上传文件格式

POST /php/upload/upload.php HTTP/1.1Host: 127.0.0.1Content-Type: multipart/form-data; boundary=标识(可自定义)请求体--标识(可自定义，但必须与请求头中一致)Content-Disposition: form-data; name="userfile[]"; filename="head1.png"Content-Type: image/png空行文件二进制数据--标识(可自定义，但必须与请求头中一致)Content-Disposition: form-data; name="userfile[]"; filename="head2.png"Content-Type: image/png空行文件二进制数据--标识(可自定义，但必须与请求头中一致)Content-Disposition: form-data; name="字段名"数据值--标识(可自定义，但必须与请求头中一致)--

多文件文件上传

#define kBOUNDARY @"abc"- (void)viewDidLoad {    [super viewDidLoad];    // 网络链接    NSString *netUrl = @"http://127.0.0.1/php/upload/upload-m.php";        // 文件路径    NSString *path1 = [[NSBundle mainBundle] pathForResource:@"head1.png" ofType:nil];    NSString *path2 = [[NSBundle mainBundle] pathForResource:@"head2.png" ofType:nil];    NSArray *array = @[path1, path2];        // 字段名    NSString *fieldName = @"userfile[]";    // 数据字典    NSDictionary *dict = @{@"username":@"mazaiting"};    // 上传文件    [self uploadFiles:netUrl fieldName:fieldName filePaths:array params:dict];    }// 上传多个文件// netUrl 网络链接// fieldName 字段名// filePaths 文件路径数组// params 参数字典- (void)uploadFiles:(NSString *)netUrl fieldName:(NSString *)fieldName filePaths:(NSArray *)filePaths params:(NSDictionary *)params {    NSURL *url = [NSURL URLWithString:netUrl];    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];    request.HTTPMethod = @"post";    // Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryJa8BALfIc9saou2X    [request setValue:[NSString stringWithFormat:@"multipart/form-data; boundary=%@",kBOUNDARY] forHTTPHeaderField:@"Content-Type"];    request.HTTPBody = [self body:fieldName filePaths:filePaths params:params];    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:     ^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {         if (connectionError) {             NSLog(@"连接错误 %@", connectionError);             return;         }         NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)response;         if (httpResponse.statusCode == 200 || httpResponse.statusCode == 304) {             // 解析数据             NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:0 error:NULL];             NSLog(@"%@",dict);         } else {             NSLog(@"服务器内部错误");         }     }];}// 构建请求体- (NSData *)body:(NSString *)fieldName filePaths:(NSArray *)filePaths params:(NSDictionary *)params {    NSMutableData *mData = [NSMutableData data];//    ------WebKitFormBoundaryJa8BALfIc9saou2X//    Content-Disposition: form-data; name="userfile[]"; filename="head1.png"//    Content-Type: image/png//    //    文件二进制数据//    ------WebKitFormBoundaryJa8BALfIc9saou2X//    Content-Disposition: form-data; name="userfile[]"; filename="head2.png"//    Content-Type: image/png//    //    文件二进制数据//    ------WebKitFormBoundaryJa8BALfIc9saou2X//    Content-Disposition: form-data; name="username"//    //    mazaiting//    ------WebKitFormBoundaryJa8BALfIc9saou2X--        // 构建文件,遍历数组    [filePaths enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {//              ------WebKitFormBoundaryJa8BALfIc9saou2X//            Content-Disposition: form-data; name="userfile[]"; filename="head2.png"//            Content-Type: image/png//        //            文件二进制数据                NSMutableString *mString = [NSMutableString string];        // 判断是否是第一个文件，如果是则不需要添加"\r\n"        if (idx != 0) {            [mString appendString:@"\r\n"];        }        [mString appendFormat:@"--%@\r\n", kBOUNDARY];        [mString appendFormat:@"Content-Disposition: form-data; name=%@; filename=%@\r\n", fieldName, [obj lastPathComponent]];        [mString appendString:@"Content-Type: application/octet-stream\r\n"];        [mString appendString:@"\r\n"];        [mData appendData:[mString dataUsingEncoding:NSUTF8StringEncoding]];        // 拼接文件的二进制数据        NSData *data = [NSData dataWithContentsOfFile:obj];        [mData appendData:data];    }];        // 构建数据    //    ------WebKitFormBoundaryJa8BALfIc9saou2X    //    Content-Disposition: form-data; name="username"    //    //    mazaiting    //    ------WebKitFormBoundaryJa8BALfIc9saou2X--    [params enumerateKeysAndObjectsUsingBlock:^(id  _Nonnull key, id  _Nonnull obj, BOOL * _Nonnull stop) {        NSMutableString *mString = [NSMutableString string];        [mString appendFormat:@"\r\n--%@\r\n", kBOUNDARY];        [mString appendFormat:@"Content-Disposition: form-data; name=%@\r\n", key];        [mString appendString:@"\r\n"];        [mString appendFormat:@"%@", obj];        [mData appendData:[mString dataUsingEncoding:NSUTF8StringEncoding]];    }];        // 结束语句    NSString *end = [NSString stringWithFormat:@"\r\n--%@--", kBOUNDARY];    [mData appendData:[end dataUsingEncoding:NSUTF8StringEncoding]];    return mData.copy;}