上传图片（http post，webservice与http区别）

由于iOS无法通过html表单来上传图片，因此想要上传图片，必须实现http请求，而不能像其他语言那样通过html表单的post就能上传。

格式

Content-type: multipart/form-data, boundary=AaB03x

--AaB03x

content-disposition: form-data; name="field1"

Hello Boris!

--AaB03x

content-disposition: form-data; name="pic"; filename="boris.png"

Content-Type: image/png

... contents of boris.png ...

--AaB03x--

代码

//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];

}

http

UIImage
*image=[UIImage
imageNamed:@"002”];
NSData* imgData =
UIImagePNGRepresentation(image);
NSData* imgData =
UIImageJPEGRepresentation(image,
0.7);

webservice

UIImage
*image=[UIImage
imageNamed:@"002"];
NSData* imgData =
UIImagePNGRepresentation(image);
Byte
*testByte = (Byte
*)[imgData
bytes];

版权声明：本文为博主原创文章，未经博主允许不得转载。