POST请求上传多张图片并携带参数

在iOS中,用POST请求携带参数上传图片是非常恶心的事情,HTTPBody部分完全需要我们自己来配置,这个HTTPBody分为3个部分,头部分可以携带参数,中间部分就是我们要传输的图片文件,尾部就是结束标识了,这些设置完了还不够,你还需要配置一下HTTPHeaderField中的Content-Length以及Content-Type,恐怕一般人都会头大:).

完整的HTTPBody解密出来后是下面的格式:

--AaB03x

Content-Disposition: form-data; name="appkey"

peixunduoduo

--AaB03x

Content-Disposition: form-data; name="content"

真心太好用了!

--AaB03x

Content-Disposition: form-data; name="userid"

--AaB03x

Content-Disposition: form-data; name="sumscore"

--AaB03x

Content-Disposition: form-data; name="courseid"

--AaB03x

Content-Disposition: form-data; name="fromapp"

--AaB03x

Content-Disposition: form-data; name="sign"

003a0d94aff1c7728ab21eb785fbd544

--AaB03x

Content-Disposition: form-data; name="timestamp"

--AaB03x

Content-Disposition: form-data; name="image1"; filename="1.png"

Content-Type: image/png

<89504e47 0d0a1a0a 0000000d  000000c9 000000b9  0082e41b c4000000 1c69444f    5d000000  5d000000 5c000030 914514f9  5d494441 547801ec 7d0b7015 55ba2eea 8ce7a8e3 191d9ff8 0221ec50 35a335b7 4a92ec47 928d2373 4818e7e8 301254d4 0113f50e 09e21c08 1ec34b04 026a8023 210e11a3 189084b9 046a02c5 4b86644c 8e922a42 098c12ca 70490e82 6e2f8178 cd78bb4b 27c7f7fb 0d924e76 26c49c01 ecfdd078 fa059f2f fe098124 c4385d62 1c5f0c75 2dde0f81 e42a8384 8db86b91 b1aea53e  4908a401  0003d4d3 12d1a949 44a83850 ba00f69b ed439299 be63b7a7 db792dd1 e7310e14 b2d7fbfb ff017ed5 ee545a48 12fc0000  4e44ae42 >

--AaB03x--

本人封装好了上传图片的类,源码如下:

NETWorkPicUpload.h

//

//  NETWorkPicUpload.h

//  UploadPics

//

//  Copyright (c) 2014年 Y.X. All rights reserved.

//

#import <Foundation/Foundation.h>

// 创建pictures数组需要的数据

NSData * createPNGPicture(NSString *formBoundary, UIImage *image,

                          NSString *name,         NSString *filename);

@interface NETWorkPicUpload : NSObject

@property (nonatomic, strong) NSString       *boundary;    // 分割字符串

@property (nonatomic, strong) NSDictionary   *parameters;  // 携带的参数

@property (nonatomic, strong) NSArray        *pictures;    // 封装好的图片的数据

- (void)configRequest:(NSMutableURLRequest **)request;

@end

NETWorkPicUpload.m

//

//  NETWorkPicUpload.m

//  UploadPics

//

//  Copyright (c) 2014年 Y.X. All rights reserved.

//

#import "NETWorkPicUpload.h"

@implementation NETWorkPicUpload

#pragma mark - 创建图片POST头部信息

- (NSData *)createParametersData

{

    // 生成了头部信息

    NSString        *start = [NSString stringWithFormat:@"--%@", _boundary];

    NSMutableString *body  = [[NSMutableString alloc] init];

    NSArray         *keys  = [_parameters allKeys];

    [keys enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {

        NSString *key = keys[idx];

        [body appendFormat:@"\r\n%@\r\n", start];

        [body appendFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n", key];

        [body appendFormat:@"%@",_parameters[key]];

    }];

    return [body dataUsingEncoding:NSUTF8StringEncoding];

}

#pragma mark - 创建图片POST尾部信息

- (NSData *)createEndData

{

    NSString *end = [NSString stringWithFormat:@"\r\n--%@--\r\n", _boundary];

    return [end dataUsingEncoding:NSUTF8StringEncoding];

}

#pragma mark - 生成POST需要的数据格式

- (NSData *)createPostData

{

    if (_boundary && _parameters)

    {

        NSMutableData *postData = [NSMutableData data];

        // 添加头

        [postData appendData:[self createParametersData]];

        // 添加图片

        [_pictures enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {

            if ([obj isKindOfClass:[NSData class]])

            {

                [postData appendData:obj];

            }

        }];

        // 添加尾

        [postData appendData:[self createEndData]];

        return postData;

    }

    else

    {

        return nil;

    }

}

#pragma mark - 创建PNG格式的图片

NSData * createPNGPicture(NSString *formBoundary, UIImage *image,

                          NSString *name,         NSString *filename)

{

    NSString *start = [NSString stringWithFormat:@"--%@", formBoundary];

    // 添加分界线，换行

    NSMutableString *subBody = [[NSMutableString alloc] init];

    [subBody appendFormat:@"\r\n%@\r\n", start];

    [subBody appendFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"%@\"\r\n",

     name, filename];

    // 声明上传文件的格式

    [subBody appendFormat:@"Content-Type: image/png\r\n\r\n"];

    // 图片data

    NSData *imageData = UIImagePNGRepresentation(image);

    // 生成图片data

    NSMutableData *tmpData = [NSMutableData data];

    [tmpData appendData:[subBody dataUsingEncoding:NSUTF8StringEncoding]];

    [tmpData appendData:imageData];

    return [NSData dataWithData:tmpData];

}

- (void)configRequest:(NSMutableURLRequest **)request

{

    // 获取到了POST包体

    NSData *data = [self createPostData];

    // 配置请求

    NSMutableURLRequest *tmpRequest = *request;

    // 设置请求POST包体

    tmpRequest.HTTPBody    = data;

    tmpRequest.HTTPMethod  = @"POST";

    // 设置HTTPHeaderField

    [tmpRequest setValue:[NSString stringWithFormat:@"%lu", (unsigned long)[data length]]

      forHTTPHeaderField:@"Content-Length"];

    [tmpRequest setValue:[NSString stringWithFormat:@"multipart/form-data; boundary=%@", _boundary]

      forHTTPHeaderField:@"Content-Type"];

}

@end