iOS开发网络篇—文件的上传
说明：文件上传使用的时POST请求，通常把要上传的数据保存在请求体中。本文介绍如何不借助第三方框架实现iOS开发中得文件上传。
由于过程较为复杂，因此本文只贴出部分关键代码。
主控制器的关键代码：
YYViewController.m
1 #import "YYViewController.h" 2 3 #define YYEncode(str) [str dataUsingEncoding:NSUTF8StringEncoding] 4 5 @interface YYViewController () 6 7 @end 8 9 @implementation YYViewController 10 11 - (void)viewDidLoad 12 { 13 [super viewDidLoad]; 14 // Do any additional setup after loading the view, typically from a nib. 15 } 16 17 - (void)upload:(NSString *)name filename:(NSString *)filename mimeType:(NSString *)mimeType data:(NSData *)data parmas:(NSDictionary *)params 18 { 19 // 文件上传 20 NSURL *url = [NSURL URLWithString:@"http://192.168.1.200:8080/YYServer/upload"]; 21 NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url]; 22 request.HTTPMethod = @"POST"; 23 24 // 设置请求体 25 NSMutableData *body = [NSMutableData data]; 26 27 /***************文件参数***************/ 28 // 参数开始的标志 29 [body appendData:YYEncode(@"--YY\r\n")]; 30 // name : 指定参数名(必须跟服务器端保持一致) 31 // filename : 文件名 32 NSString *disposition = [NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"%@\"\r\n", name, filename]; 33 [body appendData:YYEncode(disposition)]; 34 NSString *type = [NSString stringWithFormat:@"Content-Type: %@\r\n", mimeType]; 35 [body appendData:YYEncode(type)]; 36 37 [body appendData:YYEncode(@"\r\n")]; 38 [body appendData:data]; 39 [body appendData:YYEncode(@"\r\n")]; 40 41 /***************普通参数***************/ 42 [params enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) { 43 // 参数开始的标志 44 [body appendData:YYEncode(@"--YY\r\n")]; 45 NSString *disposition = [NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n", key]; 46 [body appendData:YYEncode(disposition)]; 47 48 [body appendData:YYEncode(@"\r\n")]; 49 [body appendData:YYEncode(obj)]; 50 [body appendData:YYEncode(@"\r\n")]; 51 }]; 52 53 /***************参数结束***************/ 54 // YY--\r\n 55 [body appendData:YYEncode(@"--YY--\r\n")]; 56 request.HTTPBody = body; 57 58 // 设置请求头 59 // 请求体的长度 60 [request setValue:[NSString stringWithFormat:@"%zd", body.length] forHTTPHeaderField:@"Content-Length"]; 61 // 声明这个POST请求是个文件上传 62 [request setValue:@"multipart/form-data; boundary=YY" forHTTPHeaderField:@"Content-Type"]; 63 64 // 发送请求 65 [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) { 66 if (data) { 67 NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil]; 68 NSLog(@"%@", dict); 69 } else { 70 NSLog(@"上传失败"); 71 } 72 }]; 73 } 74 75 - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 76 { 77 // Socket 实现断点上传 78 79 //apache-tomcat-6.0.41/conf/web.xml 查找 文件的 mimeType 80 // UIImage *image = [UIImage imageNamed:@"test"]; 81 // NSData *filedata = UIImagePNGRepresentation(image); 82 // [self upload:@"file" filename:@"test.png" mimeType:@"image/png" data:filedata parmas:@{@"username" : @"123"}]; 83 84 // 给本地文件发送一个请求 85 NSURL *fileurl = [[NSBundle mainBundle] URLForResource:@"itcast.txt" withExtension:nil]; 86 NSURLRequest *request = [NSURLRequest requestWithURL:fileurl]; 87 NSURLResponse *repsonse = nil; 88 NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&repsonse error:nil]; 89 90 // 得到mimeType 91 NSLog(@"%@", repsonse.MIMEType); 92 [self upload:@"file" filename:@"itcast.txt" mimeType:repsonse.MIMEType data:data parmas:@{ 93 @"username" : @"999", 94 @"type" : @"XML"}]; 95 } 96 97 @end
补充说明：
文件上传请求数据格式
部分文件的MIMEType
