在项目开发中，经常会碰到图片上传，有些后台比较坑，上传图片一定需要按照服务端那边格式把body post过去才行，格式一定要正确，你懂的，有些在客户端直接传流即可。下面说的比较坑的图片怎么post，源代码网上也比较多，直接分享下代码。
上面有注释的很清晰就不一一解释了。
1._mResponseData 是NSMutableData对象。
2.解释下ImageName，这是个key，就是你要上传给服务器的入参，看服务器怎么给你定义的，我这边是ImageName。
3.parameters这个字典封装后台给你定义的入参，一般都以json格式，我这边parameters里面的入参有ImageName。
4.请求也粘贴在下面，可直接复制代码，返回的数组需要自己改动下。
#pragma mark - 上传图片
- (void)requestPhotoApi:(NSDictionary *)parameters;
{
NSString *urlAsString = [NSString
stringWithFormat:@"%@?key=%@&",[kTestRequestURL
stringByAppendingString:@"sys/webapi/common/upload.do"],[FAUserModel
getUserToken]];
//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:urlAsString]
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:20];
//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=[parameters
objectForKey:@"imageName"];
//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= [parameters
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:@"imageName"]) {
//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",[parameters
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", (int)[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
alloc] init];
}
}
#pragma mark - NSURLConnectionDelegate
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse
*)response
{
[_mResponseData
setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData
*)data
{
[_mResponseData
appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSDictionary *dic = [NSJSONSerialization
JSONObjectWithData:_mResponseData
options:kNilOptions
error:nil];
NSLog(@"%@", dic);
if (self.buttonTag ==
ButtonTag) {
DLog(@"11111:%@",dic[@"data"])
self.uploadSevenArray = [NSMutableArray
arrayWithArray:dic[@"data"]];
}
else {
DLog(@"22222:%@",dic[@"data"])
self.uploadEgihtArray = [NSMutableArray
arrayWithArray:dic[@"data"]];
}
[self
refreshSendImImage];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError
*)error
{
NSLog(@"Error: %@", error);
}