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
#import "YYViewController.h" #define YYEncode(str) [str dataUsingEncoding:NSUTF8StringEncoding] @interface YYViewController () @end @implementation YYViewController - (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
} - (void)upload:(NSString *)name filename:(NSString *)filename mimeType:(NSString *)mimeType data:(NSData *)data parmas:(NSDictionary *)params
{
// 文件上传
NSURL *url = [NSURL URLWithString:@"http://192.168.1.200:8080/YYServer/upload"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
request.HTTPMethod = @"POST"; // 设置请求体
NSMutableData *body = [NSMutableData data]; /***************文件参数***************/
// 参数开始的标志
[body appendData:YYEncode(@"--YY\r\n")];
// name : 指定参数名(必须跟服务器端保持一致)
// filename : 文件名
NSString *disposition = [NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"%@\"\r\n", name, filename];
[body appendData:YYEncode(disposition)];
NSString *type = [NSString stringWithFormat:@"Content-Type: %@\r\n", mimeType];
[body appendData:YYEncode(type)]; [body appendData:YYEncode(@"\r\n")];
[body appendData:data];
[body appendData:YYEncode(@"\r\n")]; /***************普通参数***************/
[params enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
// 参数开始的标志
[body appendData:YYEncode(@"--YY\r\n")];
NSString *disposition = [NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n", key];
[body appendData:YYEncode(disposition)]; [body appendData:YYEncode(@"\r\n")];
[body appendData:YYEncode(obj)];
[body appendData:YYEncode(@"\r\n")];
}]; /***************参数结束***************/
// YY--\r\n
[body appendData:YYEncode(@"--YY--\r\n")];
request.HTTPBody = body; // 设置请求头
// 请求体的长度
[request setValue:[NSString stringWithFormat:@"%zd", body.length] forHTTPHeaderField:@"Content-Length"];
// 声明这个POST请求是个文件上传
[request setValue:@"multipart/form-data; boundary=YY" forHTTPHeaderField:@"Content-Type"]; // 发送请求
[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
if (data) {
NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];
NSLog(@"%@", dict);
} else {
NSLog(@"上传失败");
}
}];
} - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
// Socket 实现断点上传 //apache-tomcat-6.0.41/conf/web.xml 查找 文件的 mimeType
// UIImage *image = [UIImage imageNamed:@"test"];
// NSData *filedata = UIImagePNGRepresentation(image);
// [self upload:@"file" filename:@"test.png" mimeType:@"image/png" data:filedata parmas:@{@"username" : @"123"}]; // 给本地文件发送一个请求
NSURL *fileurl = [[NSBundle mainBundle] URLForResource:@"itcast.txt" withExtension:nil];
NSURLRequest *request = [NSURLRequest requestWithURL:fileurl];
NSURLResponse *repsonse = nil;
NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&repsonse error:nil]; // 得到mimeType
NSLog(@"%@", repsonse.MIMEType);
[self upload:@"file" filename:@"itcast.txt" mimeType:repsonse.MIMEType data:data parmas:@{
@"username" : @"",
@"type" : @"XML"}];
} @end
补充说明：
文件上传请求数据格式
部分文件的MIMEType