NSURLConnection上传，进度条

缺乏、安全感 2023-10-17 06:16 41阅读 0赞

结合上一篇下载[NSURLConnection下载大小文件，断点下载][NSURLConnection]

本片介绍上传，显示进度条

- (IBAction)showImgPicker:(UIButton *)sender
    {
        //UIImagePickerController  图片选择器
        UIImagePickerController *imgPicker = [[UIImagePickerController alloc]init ];
        
        //allowsEditing  是否允许编辑
        imgPicker.allowsEditing = YES;
        //isSourceTypeAvailable  设置图片来源，默认为相册，可以设置为摄像头
        if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
        {
            NSLog(@"摄像头不可用");
        }
        else
        {
            imgPicker.sourceType = UIImagePickerControllerSourceTypeCamera;
        }
        imgPicker.delegate = self;
        [self presentViewController:imgPicker animated:YES completion:nil];
        [imgPicker release];
    }
    
    /**
     * 选择完成图片时调用
     */
    - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo
    {
        _imgView.image = image;
        [self dismissViewControllerAnimated:YES completion:nil];
    }
    
    //上传图片
    - (IBAction)UploadImageClick:(UIButton *)sender
    {
        NSURL *url = [NSURL URLWithString:@"http://127.0.0.1:8080/FileUploadServer/UploadServlet"];
        
        NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
        //上传文件必须用POST请求
        [request setHTTPMethod:@"POST"];
        //forHTTPHeaderField 设置请求头   Content-type,请求体中的数据格式
        [request addValue:@"multipart/form-data" forHTTPHeaderField:@"Content-type"];
        
        //UIImageJPEGRepresentation  把一个UIImage转成jpg格式的数据，第二个参数是压缩比例，范围0～1
        //NSData *data = UIImageJPEGRepresentation(_imgView.image, 0.7);
        //UIImagePNGRepresentation   把一个UIImage转成png格式的数据
        NSData *data = UIImagePNGRepresentation(_imgView.image);
        //把图片数据放入请求体
        [request setHTTPBody:data];
        
        NSURLConnection *connection = [NSURLConnection connectionWithRequest:request delegate:self];
        [connection start];
    }
    
    //上传大文件
    - (IBAction)uploadFile:(UIButton *)sender
    {
        NSString *path = [[NSBundle mainBundle]pathForResource:@"file" ofType:@"zip"];
        //NSInputStream  输入流 ，用于大量数据的输入
        //inputStreamWithFileAtPath  创建一个文件的输入流
        NSInputStream *stream = [NSInputStream inputStreamWithFileAtPath:path];
        
        NSURL *url = [NSURL URLWithString:@"http://127.0.0.1:8080/FileUploadServer/UploadServlet"];
        NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
        //上传文件必须用POST请求
        [request setHTTPMethod:@"POST"];
        //设置请求头   Content-type,请求体中的数据格式
        [request addValue:@"multipart/form-data" forHTTPHeaderField:@"Content-type"];
        
        //获得上传文件大小
        NSDictionary *attDic = [[NSFileManager defaultManager]attributesOfItemAtPath:path error:nil];
        [request addValue:[NSString stringWithFormat:@"%lld",[attDic fileSize]] forHTTPHeaderField:@"Content-Length"];
        //setHTTPBodyStream  设置请求体的输入流,当上传的数据量很大时，无法全部读入内粗，就需要用输入就上传
        [request setHTTPBodyStream:stream];
        
        NSURLConnection *connection = [NSURLConnection connectionWithRequest:request delegate:self];
        [connection start];
    }
    
    - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
    {
        NSLog(@"请求失败:%@",error);
    }
    
    - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
    {}
    
    - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
    {}
    
    - (void)connectionDidFinishLoading:(NSURLConnection *)connection
    {
        NSLog(@"上传完毕！");
    }
    
    //当发送出数据时调用
    - (void)connection:(NSURLConnection *)connection didSendBodyData:(NSInteger)bytesWritten totalBytesWritten:(NSInteger)totalBytesWritten totalBytesExpectedToWrite:(NSInteger)totalBytesExpectedToWrite
    {
        //NSLog(@"%ld----%ld----%ld",bytesWritten,totalBytesWritten,totalBytesExpectedToWrite);
        _progressView.progress = (double)totalBytesWritten / (double)totalBytesExpectedToWrite;
    }

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[NSURLConnection]: http://blog.csdn.net/minggeqingchun/article/details/51816031
[Center]: https://img-blog.csdn.net/20160703173536415?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center