上篇写到一张上传的，但不实用，毕竟发表动态基本都是多张上传，从网上也找好多大神写的，现在就简单总结一下。

请求方式post

-(NSString *)PostImagesToServer:(NSString *) strUrl dicPostParams:(NSMutableDictionary *)params dicImages:(NSMutableArray *) dicImages{

NSString * res;

//分界线的标识符

NSString *TWITTERFON_FORM_BOUNDARY = @"AaB03x";

//根据url初始化request

NSURL *url = [NSURL URLWithString:strUrl];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

//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;

//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]];

}

//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]];

//循环加入上传图片

for(int i = 0; i< [dicImages count] ; i++){

//要上传的图片

image = [dicImages objectAtIndex:i];

//得到图片的data

NSData* data =  UIImageJPEGRepresentation(image, 0.0);

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

//此处循环添加图片文件

////添加分界线，换行

[imgbody appendFormat:@"%@\r\n",MPboundary];

[imgbody appendFormat:@"Content-Disposition: form-data; name=\"content2[]\"; filename=\"%@.jpg\"\r\n",[self.imageArray objectAtIndex:i]];

//声明上传文件的格式

//[imgbody appendFormat:@"Content-Type: application/octet-stream; charset=utf-8\r\n\r\n"];

[imgbody appendFormat:@"Content-Type: image/jpeg; charset=utf-8\r\n\r\n"];

NSLog(@"上传的图片：%d  %@", i, [dicImages objectAtIndex:i]);

//将body字符串转化为UTF8格式的二进制

[myRequestData appendData:[imgbody dataUsingEncoding:NSUTF8StringEncoding]];

//将image的data加入

[myRequestData appendData:data];

[myRequestData appendData:[ @"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];

}

//声明结束符：--AaB03x--

NSString *end=[[NSString alloc]initWithFormat:@"%@\r\n",endMPboundary];

//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:@"%lu", (unsigned long)[myRequestData length]] forHTTPHeaderField:@"Content-Length"];

//设置http body

[request setHTTPBody:myRequestData];

//http method

[request setHTTPMethod:@"POST"];

//设置接受response的data

NSData *mResponseData;

NSError *err = nil;

mResponseData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:&err];

if(mResponseData == nil){

NSLog(@"err code : %@", [err localizedDescription]);

}

res = [[NSString alloc] initWithData:mResponseData encoding:NSUTF8StringEncoding];

NSLog(@"服务器返回：%@", res);

return res;

}

params 表单数据

dicImages 图片数组或字典，我的是数组，所以改了。