//ASIFormDataRequest方式 POST上传图片 
-(NSDictionary *)addPicWithDictionary:(NSDictionary *)sugestDic{ 
  
    NSDictionary *tempDic=nil; 
      
    NSString *url=[NSString stringWithFormat:@"http://182.50.0.62:8095/xianServer/upload/uploadImage?clientType=mobile"]; 
      
    form = [[[ASIFormDataRequest alloc] 
             initWithURL:[NSURL URLWithString:url]] autorelease]; 
    [form setTimeOutSeconds:60.0]; 
    form.delegate = self; 
    //添加拍照图 
      
      
    //分界线的标识符  
    NSString *TWITTERFON_FORM_BOUNDARY = @"AaB03x";  
    //分界线 --AaB03x  
    NSString *MPboundary=[[NSString alloc]initWithFormat:@"--%@",TWITTERFON_FORM_BOUNDARY];  
    //结束符 AaB03x--  
    NSString *endMPboundary=[[NSString alloc]initWithFormat:@"%@--",MPboundary]; 
    //添加拍照图片 
    imageView.image=[UIImage imageNamed:@"[email protected]"]; 
    NSData* data = UIImagePNGRepresentation(imageView.image); 
    NSLog(@"%@",data); 
    //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= [sugestDic 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:@"files"]) 
        {   
            //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",[sugestDic objectForKey:key]];               
        }   
    }   
    if (imageView.image) { 
        ////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=\"files\"; 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]; 
      
    [form addRequestHeader:@"Content-Type" value:content]; 
    [form addRequestHeader:@"Content-Length" value:[NSString stringWithFormat:@"%d", [myRequestData length]]]; 
    [form setRequestMethod:@"POST"]; 
    [form startAsynchronous]; 
    [form setDidFailSelector:@selector(requestBeFailed:)]; 
    [form setDidFinishSelector:@selector(requestBeFinished:)]; 
    // 解析取得的结果 
    return tempDic;  
} 

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iOS从远程地址获取图片并修改尺寸详解
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