IOS之上传图片

来源：互联网发布：人工智能产品代理编辑：程序博客网时间：2024/05/01 20:05

IOS图片上传功能实现总结

IOS图片上传主要分两种方式实现，一个是将图片信息以表单的形式上传，一种是将图片以JSON的格式上传。

首先要讲的是以这两个方式上传的一个比较明显的区别就是HTTP Header是如何标记的，以表单的形式上传时HTTP Header应该设置为multipart/form-data，以JSON格式上传时HTTP Header应该设置为application/json。

Content-Type: multipart/form-data; boundary=${bound}

Content-Type: application/json

了解了这些那我们在IOS项目中应该如何运用他们呢？

一、表单上传图片

    //分界线的标识符    NSString *TWITTERFON_FORM_BOUNDARY = @"AaB03x";    //根据url初始化request    NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]                                                           cachePolicy:NSURLRequestReloadIgnoringLocalCacheData                                                       timeoutInterval:10];    //分界线 --AaB03x    NSString *MPboundary=[[NSString alloc]initWithFormat:@"--%@",TWITTERFON_FORM_BOUNDARY];    //结束符 AaB03x--    NSString *endMPboundary=[[NSString alloc]initWithFormat:@"%@--",MPboundary];    //要上传的图片    UIImage *image=[params objectForKey:@"pic"];    //得到图片的data    NSData* data = UIImagePNGRepresentation(image);    //http body的字符串    NSMutableString *body=[[NSMutableString alloc]init];    //参数的集合的所有key的集合    NSArray *keys= [params allKeys];        //遍历keys    for(int i=0;i<[keys count];i++)    {        //得到当前key        NSString *key=[keys objectAtIndex:i];        //如果key不是pic，说明value是字符类型，比如name：Boris        if(![key isEqualToString:@"pic"])        {            //添加分界线，换行            [body appendFormat:@"%@\r\n",MPboundary];            //添加字段名称，换2行            [body appendFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n",key];            //添加字段的值            [body appendFormat:@"%@\r\n",[params objectForKey:key]];        }    }        ////添加分界线，换行    [body appendFormat:@"%@\r\n",MPboundary];    //声明pic字段，文件名为boris.png    [body appendFormat:@"Content-Disposition: form-data; name=\"pic\"; filename=\"boris.png\"\r\n"];    //声明上传文件的格式    [body appendFormat:@"Content-Type: image/png\r\n\r\n"];        //声明结束符：--AaB03x--    NSString *end=[[NSString alloc]initWithFormat:@"\r\n%@",endMPboundary];    //声明myRequestData，用来放入http body    NSMutableData *myRequestData=[NSMutableData data];    //将body字符串转化为UTF8格式的二进制    [myRequestData appendData:[body dataUsingEncoding:NSUTF8StringEncoding]];    //将image的data加入    [myRequestData appendData:data];    //加入结束符--AaB03x--    [myRequestData appendData:[end dataUsingEncoding:NSUTF8StringEncoding]];        //设置HTTPHeader中Content-Type的值    NSString *content=[[NSString alloc]initWithFormat:@"multipart/form-data; boundary=%@",TWITTERFON_FORM_BOUNDARY];    //设置HTTPHeader    [request setValue:content forHTTPHeaderField:@"Content-Type"];    //设置Content-Length    [request setValue:[NSString stringWithFormat:@"%d", [myRequestData length]] forHTTPHeaderField:@"Content-Length"];    //设置http body    [request setHTTPBody:myRequestData];    //http method    [request setHTTPMethod:@"POST"];        //建立连接，设置代理    NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];        //设置接受response的data    if (conn) {        mResponseData = [[NSMutableData data] retain];    }

二、JSON上传图片

    //根据url初始化request    NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]                                                           cachePolicy:NSURLRequestReloadIgnoringLocalCacheData                                                       timeoutInterval:10];    //要上传的图片    UIImage *image=[params objectForKey:@"pic"];    //得到图片的data    NSData* data = UIImagePNGRepresentation(image);    //base64编码    NSString *photoStr = [data base64Encoding];    //参数字典    NSDictionary *params = [[NSDictionary alloc] init];    [params setObject:@{@"avatar": photoStr} forKey:@"profile"];     NSData *myRequestData  = [NSMutableData dataWithData:[NSJSONSerialization dataWithJSONObject:params options:NSJSONWritingPrettyPrinted error:nil]];   //设置http header[request.request setValue:@"application/json" forHTTPHeaderField:@"Content-type"];    [request.request setValue:@"application/json" forHTTPHeaderField:@"Accept"];    //设置http body    [request setHTTPBody:myRequestData];    //http method    [request setHTTPMethod:@"POST"];        //建立连接，设置代理    NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];        //设置接受response的data    if (conn) {        mResponseData = [[NSMutableData data] retain];    }

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