IOS开发教程 - 如何通过二进制数据上传图片

在项目中，我们经常会遇到图片上传的问题，估计大家都会遇到这个问题，今天特意总结并贴出实用的代码分享给大家。希望对大家有所帮助。

直接上代码:

-(NSString *)uploadImage: (NSString *)url

                     postParems: (NSMutableDictionary *)postParems

                          image: (UIImage *)image

{

    NSString *TWITTERFON_FORM_BOUNDARY = @"--WebKitFormBoundaryqRL9PfS8f0kLqJF0";

    //根据url初始化request

    NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]

                                                           cachePolicy:NSURLRequestReloadIgnoringLocalCacheData

                                                       timeoutInterval:10];

    //分界线

    NSString *MPboundary=[[NSString alloc]initWithFormat:@"--%@",TWITTERFON_FORM_BOUNDARY];

    //结束符

    NSString *endMPboundary=[[NSString alloc]initWithFormat:@"%@--",MPboundary];

    //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= [postParems allKeys];

    //遍历keys

    for(int i=0;i<[keys count];i++)

    {

        //得到当前key

        NSString *key=[keys objectAtIndex:i];

        //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",[postParems objectForKey:key]];

        NSLog(@"添加字段的值==%@",[postParems objectForKey:key]);

    }

    ////添加分界线，换行

    [body appendFormat:@"%@\r\n",MPboundary];

    [body appendFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"%@\"\r\n",@"file",@"filename.jpg"];

        //声明上传文件的格式

        [body appendFormat:@"Content-Type: image/jpg,image/png, image/jpeg, image/pjpeg, image/pjpeg\r\n\r\n"];

    //声明结束符：

    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

    [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:@"%ld", [myRequestData length]] forHTTPHeaderField:@"Content-Length"];

    //设置http body

    [request setHTTPBody:myRequestData];

    //http method

    [request setHTTPMethod:@"POST"];

    NSHTTPURLResponse *urlResponese = nil;

    NSError *error = [[NSError alloc] init];

    NSData *resultData = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponese error:&error];

    NSString *result= [[NSString alloc] initWithData:resultData encoding:NSUTF8StringEncoding];

    if([urlResponese statusCode] >=200 && [urlResponese statusCode] < 300)

    {

        NSLog(@"返回结果=====%@",result);

        return result;

    }

    return nil;

}

在调用的地方调用一下代码

    NSMutableDictionary * dict=[NSMutableDictionary dictionaryWithCapacity:7];

    [dict setValue:@"value123" forKey:@"key123"];

    NSString *url = @"http://192.168.1.150/upload/fileUpload.do";

    UIImage *image = [UIImage imageNamed:@"upimage"];

    [self uploadImage:url postParems:dict image:image];