iOS开发之网络编程--5、NSURLSessionUploadTask+NSURLSessionDataDelegate代理上传

  1 #import "ViewController.h"
  2 #define kBoundary @"----WebKitFormBoundary0IQAt0HA7oxwIx3f"
  3 #define KNewLine [@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]
  4 
  5 @interface ViewController ()<NSURLSessionDataDelegate>
  6 
  7 @end
  8 
  9 @implementation ViewController
 10 
 11 -(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
 12 {
 13     NSLog(@"------");
 14     //1.创建会话对象,设置代理
 15     NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[NSOperationQueue mainQueue]];
 16     
 17     //2.创建请求对象
 18     NSURL *url =[NSURL URLWithString:@"http://120.25.226.186:32812/upload"];
 19     NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
 20     
 21     //2.1 修改请求方法
 22     request.HTTPMethod = @"POST";
 23     
 24     //2.2 设置请求头
 25     NSString *header = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",kBoundary];
 26     [request setValue:header forHTTPHeaderField:@"Content-Type"];
 27     
 28     //3.创建上传task
 29     /*
 30      第一个参数:请求对象
 31      第二个参数:要上传文件的参数(二进制数据
 32      第三个参数:completionHandler
 33         data:服务器返回的结果(响应体信息)
 34         response:响应头
 35      */
 36    NSURLSessionUploadTask *uploadTask = [session uploadTaskWithRequest:request fromData:[self getBodyData] completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
 37        
 38        //5.解析结果
 39        NSLog(@"%@",[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding]);
 40     }];
 41     
 42     //4.执行任务
 43     [uploadTask resume];
 44     
 45 }
 46 
 47 -(NSData *)getBodyData
 48 {
 49     //5.拼接数据
 50     NSMutableData *fileData = [NSMutableData data];
 51     
 52     //5.1 拼接文件参数
 53     /*
 54      --分隔符
 55      Content-Disposition: form-data; name="file"; filename="Snip20151228_572.png"
 56      Content-Type: image/png
 57      空行
 58      文件二进制数据
 59      */
 60     [fileData appendData:[[NSString stringWithFormat:@"--%@",kBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
 61     [fileData appendData:KNewLine];
 62     // name="file":参数,是固定的
 63     // filename:文件上传到服务器以什么名字来保存,随便
 64     [fileData appendData:[@"Content-Disposition: form-data; name=\"file\"; filename=\"Snip20151228_572.png\"" dataUsingEncoding:NSUTF8StringEncoding]];
 65     
 66     [fileData appendData:KNewLine];
 67     //Content-Type:要上传的文件的类型 (MIMEType)
 68     [fileData appendData: [@"Content-Type: image/png" dataUsingEncoding:NSUTF8StringEncoding]];
 69     [fileData appendData:KNewLine];
 70     [fileData appendData:KNewLine];
 71     
 72     UIImage *image = [UIImage imageNamed:@"Snip20151229_713"];
 73     NSData *imageData = UIImagePNGRepresentation(image);
 74     [fileData appendData:imageData];
 75     [fileData appendData:KNewLine];
 76     
 77     //5.2 拼接非文件参数
 78     /*
 79      --分隔符
 80      Content-Disposition: form-data; name="username"
 81      空行
 82      非文件参数的二进制数据
 83      */
 84     [fileData appendData:[[NSString stringWithFormat:@"--%@",kBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
 85     [fileData appendData:KNewLine];
 86     
 87     //username:同file 是服务器规定
 88     [fileData appendData:[@"Content-Disposition: form-data; name=\"username\"" dataUsingEncoding:NSUTF8StringEncoding]];
 89     [fileData appendData:KNewLine];
 90     [fileData appendData:KNewLine];
 91     [fileData appendData:[@"dashen9" dataUsingEncoding:NSUTF8StringEncoding]];
 92     [fileData appendData:KNewLine];
 93     
 94     //5.3 拼接结尾标识
 95     /*
 96      --分隔符--
 97      */
 98     [fileData appendData:[[NSString stringWithFormat:@"--%@--",kBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
 99     
100     return fileData;
101 }
102 
103 #pragma mark ----------------------
104 #pragma mark NSURLSessionDataDelegate
105 /*
106  第一个参数:bytesSent本次发送数据的大小
107  第二个参数:totalBytesSent一共发送了多少数据
108  第三个参数:totalBytesExpectedToSend文件的总大小
109  */
110 -(void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didSendBodyData:(int64_t)bytesSent totalBytesSent:(int64_t)totalBytesSent totalBytesExpectedToSend:(int64_t)totalBytesExpectedToSend
111 {
112     NSLog(@"已经上传了%f的数据",1.0 * totalBytesSent/totalBytesExpectedToSend );
113 }
114 @end