IOS NSURLConnection 文件上传

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<span style="font-size:14px;"><strong>////  ViewController.m//  UPLoadFile////  Created by hq on 16/4/17.//  Copyright © 2016年 hanqing. All rights reserved.//#import "ViewController.h"//boundary#define HQBoundary @"com.hq"//换行#define HQNewLine [@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]//将字符串编码#define HQEncode(string) [string dataUsingEncoding:NSUTF8StringEncoding]@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];            NSString *urlString=@"http://xxxx/upload";        NSString *name=@"file";        NSString *fileName=@"flieName";        NSString *fileMIMEType=@"image/jpeg";        NSString *username=@"hq";            NSMutableURLRequest *request=[NSMutableURLRequest requestWithURL:[NSURL URLWithString:urlString]];        request.HTTPMethod=@"POST";        //设置请求头    [request setValue:[NSString stringWithFormat:@"multipart/form-data; boundary=%@",HQBoundary] forHTTPHeaderField:@"Content-Type"];        //设置请求体    NSMutableData *body=[NSMutableData data];            //分割线    [body appendData:HQEncode(@"--")];    [body appendData:HQEncode(HQBoundary)];    [body appendData:HQNewLine];            //文件参数名    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=%@; filename=%@",name,fileName]dataUsingEncoding:NSUTF8StringEncoding]];    [body appendData:HQNewLine];        //文件类型    [body appendData:[[NSString stringWithFormat:@"Content-Type:%@",fileMIMEType] dataUsingEncoding:NSUTF8StringEncoding]];    [body appendData:HQNewLine];        //文件数据    [body appendData:HQNewLine];    UIImage *image=[UIImage imageNamed:@"2"];    [body appendData:UIImagePNGRepresentation(image)];    [body appendData:HQNewLine];            //非文件参数        //分割线    [body appendData:HQEncode(@"--")];    [body appendData:HQEncode(HQBoundary)];    [body appendData:HQNewLine];            //参数名    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=%@",username] dataUsingEncoding:NSUTF8StringEncoding]];    [body appendData:HQNewLine];        [body appendData:HQNewLine];    [body appendData:HQEncode(@"hq")];    [body appendData:HQNewLine];            //结束标记    [body appendData:HQEncode(@"--")];    [body appendData:HQEncode(HQBoundary)];    [body appendData:HQEncode(@"--")];    [body appendData:HQNewLine];        request.HTTPBody=body;        [NSURLConnection sendAsynchronousRequest:request queue:[[NSOperationQueue alloc]init] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {               NSLog(@"%@",[NSJSONSerialization JSONObjectWithData:data options:nil error:nil]);            }];    }@end</strong></span>
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