iOS開辟中文件的上傳和下載功效的根本完成
文件的上傳
解釋：文件上傳應用的時POST要求，平日把要上傳的數據保留在要求體中。本文引見若何不借助第三方框架完成IOS開辟中得文件上傳。
因為進程較為龐雜，是以本文只貼出部門症結代碼。
主掌握器的症結代碼：
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
{
// 文件上傳
NSURL *url = [NSURL URLWithString:@"http://192.168.1.200:8080/YYServer/upload"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
request.HTTPMethod = @"POST";
// 設置要求體
NSMutableData *body = [NSMutableData data];
/***************文件參數***************/
// 參數開端的標記
[body appendData:YYEncode(@"--YY\r\n")];
// name : 指定參數名(必需跟辦事器端堅持分歧)
// 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")];
/***************通俗參數***************/
[params enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
// 參數開端的標記
[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")];
}];
/***************參數停止***************/
// YY--\r\n
[body appendData:YYEncode(@"--YY--\r\n")];
request.HTTPBody = body;
// 設置要求頭
// 要求體的長度
[request setValue:[NSString stringWithFormat:@"%zd", body.length] forHTTPHeaderField:@"Content-Length"];
// 聲明這個POST要求是個文件上傳
[request setValue:@"multipart/form-data; boundary=YY" forHTTPHeaderField:@"Content-Type"];
// 發送要求
[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(@"上傳掉敗");
}
}];
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
// Socket 完成斷點上傳
//apache-tomcat-6.0.41/conf/web.XmlRss/ target=_blank class=infotextkey>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"}];
// 給當地文件發送一個要求
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];
// 獲得mimeType
NSLog(@"%@", repsonse.MIMEType);
[self upload:@"file" filename:@"itcast.txt" mimeType:repsonse.MIMEType data:data parmas:@{
@"username" : @"999",
@"type" : @"XmlRss/ target=_blank class=infotextkey>Xml"}];
}
@end
彌補解釋：
文件上傳要求數據格局
部門文件的MIMEType
多線程斷點下載
解釋：本文引見多線程斷點下載。項目中應用了蘋果自帶的類，完成了同時開啟多條線程下載一個較年夜的文件。由於完成進程較為龐雜，所以上面貼出完全的代碼。
完成思緒：下載開端，創立一個和要下載的文件年夜小雷同的文件（假如要下載的文件為100M，那末就在沙盒中創立一個100M的文件，然後盤算每段的下載量，開啟多條線程下載各段的數據，分離寫入對應的文件部門）。
項目頂用到的重要類以下：
完成的完成代碼以下：
主掌握器中的代碼：
#import "YYViewController.h"
#import "YYFileMultiDownloader.h"
@interface YYViewController ()
@property (nonatomic, strong) YYFileMultiDownloader *fileMultiDownloader;
@end
@implementation YYViewController
- (YYFileMultiDownloader *)fileMultiDownloader
{
if (!_fileMultiDownloader) {
_fileMultiDownloader = [[YYFileMultiDownloader alloc] init];
// 須要下載的文件長途URL
_fileMultiDownloader.url = @"http://192.168.1.200:8080/MJServer/resources/jre.zip";
// 文件保留到甚麼處所
NSString *caches = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
NSString *filepath = [caches stringByAppendingPathComponent:@"jre.zip"];
_fileMultiDownloader.destPath = filepath;
}
return _fileMultiDownloader;
}
- (void)viewDidLoad
{
[super viewDidLoad];
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
[self.fileMultiDownloader start];
}
@end
自界說一個基類
YYFileDownloader.h文件
#import <Foundation/Foundation.h>
@interface YYFileDownloader : NSObject
{
BOOL _downloading;
}
/**
* 所須要下載文件的長途URL(銜接辦事器的途徑)
*/
@property (nonatomic, copy) NSString *url;
/**
* 文件的存儲途徑(文件下載到甚麼處所)
*/
@property (nonatomic, copy) NSString *destPath;
/**
* 能否正鄙人載(有無鄙人載, 只要下載器外部才曉得)
*/
@property (nonatomic, readonly, getter = isDownloading) BOOL downloading;
/**
* 用來監聽下載進度
*/
@property (nonatomic, copy) void (^progressHandler)(double progress);
/**
* 開端(恢復)下載
*/
- (void)start;
/**
* 暫停下載
*/
- (void)pause;
@end
YYFileDownloader.m文件
#import "YYFileDownloader.h"
@implementation YYFileDownloader
@end
下載器類繼續自YYFileDownloader這個類
YYFileSingDownloader.h文件
#import "YYFileDownloader.h"
@interface YYFileSingleDownloader : YYFileDownloader
/**
* 開端的地位
*/
@property (nonatomic, assign) long long begin;
/**
* 停止的地位
*/
@property (nonatomic, assign) long long end;
@end
YYFileSingDownloader.m文件
#import "YYFileSingleDownloader.h"
@interface YYFileSingleDownloader() <NSURLConnectionDataDelegate>
/**
* 銜接對象
*/
@property (nonatomic, strong) NSURLConnection *conn;
/**
* 寫數據的文件句柄
*/
@property (nonatomic, strong) NSFileHandle *writeHandle;
/**
* 以後已下載數據的長度
*/
@property (nonatomic, assign) long long currentLength;
@end
@implementation YYFileSingleDownloader
- (NSFileHandle *)writeHandle
{
if (!_writeHandle) {
_writeHandle = [NSFileHandle fileHandleForWritingAtPath:self.destPath];
}
return _writeHandle;
}
/**
* 開端(恢復)下載
*/
- (void)start
{
NSURL *url = [NSURL URLWithString:self.url];
// 默許就是GET要求
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
// 設置要求頭信息
NSString *value = [NSString stringWithFormat:@"bytes=%lld-%lld", self.begin + self.currentLength, self.end];
[request setValue:value forHTTPHeaderField:@"Range"];
self.conn = [NSURLConnection connectionWithRequest:request delegate:self];
_downloading = YES;
}
/**
* 暫停下載
*/
- (void)pause
{
[self.conn cancel];
self.conn = nil;
_downloading = NO;
}
#pragma mark - NSURLConnectionDataDelegate 署理辦法
/**
* 1. 當接收到辦事器的呼應(連通了辦事器)就會挪用
*/
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
}
/**
* 2. 當接收到辦事器的數據就會挪用(能夠會被挪用屢次, 每次挪用只會傳遞部門數據)
*/
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
// 挪動到文件的尾部
[self.writeHandle seekToFileOffset:self.begin + self.currentLength];
// 從以後挪動的地位(文件尾部)開端寫入數據
[self.writeHandle writeData:data];
// 累加長度
self.currentLength += data.length;
// 打印下載進度
double progress = (double)self.currentLength / (self.end - self.begin);
if (self.progressHandler) {
self.progressHandler(progress);
}
}
/**
* 3. 當辦事器的數據接收終了後就會挪用
*/
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
// 清空屬性值
self.currentLength = 0;
// 封閉銜接(不再輸出數據到文件中)
[self.writeHandle closeFile];
self.writeHandle = nil;
}
/**
* 要求毛病(掉敗)的時刻挪用(要求超時\斷網\沒有網, 普通指客戶端毛病)
*/
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
}
@end
設計多線程下載器(應用HMFileMultiDownloader能開啟多個線程同時下載一個文件)
一個多線程下載器只下載一個文件
YYFileMultiDownloader.h文件
#import "YYFileDownloader.h"
@interface YYFileMultiDownloader : YYFileDownloader
@end
YYFileMultiDownloader.m文件
#import "YYFileMultiDownloader.h"
#import "YYFileSingleDownloader.h"
#define YYMaxDownloadCount 4
@interface YYFileMultiDownloader()
@property (nonatomic, strong) NSMutableArray *singleDownloaders;
@property (nonatomic, assign) long long totalLength;
@end
@implementation YYFileMultiDownloader
- (void)getFilesize
{
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:self.url]];
request.HTTPMethod = @"HEAD";
NSURLResponse *response = nil;
#warning 這裡要用異步要求
[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:nil];
self.totalLength = response.expectedContentLength;
}
- (NSMutableArray *)singleDownloaders
{
if (!_singleDownloaders) {
_singleDownloaders = [NSMutableArray array];
// 取得文件年夜小
[self getFilesize];
// 每條途徑的下載量
long long size = 0;
if (self.totalLength % YYMaxDownloadCount == 0) {
size = self.totalLength / YYMaxDownloadCount;
} else {
size = self.totalLength / YYMaxDownloadCount + 1;
}
// 創立N個下載器
for (int i = 0; i<YYMaxDownloadCount; i++) {
YYFileSingleDownloader *singleDownloader = [[YYFileSingleDownloader alloc] init];
singleDownloader.url = self.url;
singleDownloader.destPath = self.destPath;
singleDownloader.begin = i * size;
singleDownloader.end = singleDownloader.begin + size - 1;
singleDownloader.progressHandler = ^(double progress){
NSLog(@"%d --- %f", i, progress);
};
[_singleDownloaders addObject:singleDownloader];
}
// 創立一個跟辦事器文件等年夜小的暫時文件
[[NSFileManager defaultManager] createFileAtPath:self.destPath contents:nil attributes:nil];
// 讓self.destPath文件的長度是self.totalLengt
NSFileHandle *handle = [NSFileHandle fileHandleForWritingAtPath:self.destPath];
[handle truncateFileAtOffset:self.totalLength];
}
return _singleDownloaders;
}
/**
* 開端(恢復)下載
*/
- (void)start
{
[self.singleDownloaders makeObjectsPerformSelector:@selector(start)];
_downloading = YES;
}
/**
* 暫停下載
*/
- (void)pause
{
[self.singleDownloaders makeObjectsPerformSelector:@selector(pause)];
_downloading = NO;
}
@end
彌補解釋：若何取得將要下載的文件的年夜小？
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