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 ];
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