iOS网络(三)：NSURLConnection大文件下载，断点续传，NSOutputStream断点续传，文件上传及文件解压缩

---

NSURLConnection大文件下载（断点续传）

1.  NSFileHandle

#import "ViewController.h"

@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIProgressView *progressView;

@property (nonatomic, assign) NSInteger totalSize;
@property (nonatomic, assign) NSInteger currentSize;
/** 文件句柄*/
@property (nonatomic, strong)NSFileHandle *handle;
/** 沙盒路径 */
@property (nonatomic, strong) NSString *fullPath;
/** 连接对象 */
@property (nonatomic, strong) NSURLConnection *connect;
@end

@implementation ViewController


- (IBAction)startBtnClick:(id)sender {
    [self download];
}
- (IBAction)cancelBtnClick:(id)sender {
    [self.connect cancel];
}
- (IBAction)goOnBtnClick:(id)sender {
    [self download];
}

//内存飙升
-(void)download
{
    //1.url
    // NSURL *url = [NSURL URLWithString:@"http://imgsrc.baidu.com/forum/w%3D580/sign=54a8cc6f728b4710ce2ffdc4f3cec3b2/d143ad4bd11373f06c0b5bd1a40f4bfbfbed0443.jpg"];
    
    NSURL *url = [NSURL URLWithString:@"http://www.33lc.com/article/UploadPic/2012-10/2012102514201759594.jpg"];
    
    //2.创建请求对象
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    
    //设置请求头信息,告诉服务器值请求一部分数据range
    /*
     bytes=0-100 
     bytes=-100
     bytes=0- 请求100之后的所有数据
     */
    NSString *range = [NSString stringWithFormat:@"bytes=%zd-",self.currentSize];
    [request setValue:range forHTTPHeaderField:@"Range"];
    NSLog(@"+++++++%@",range);
    
    //3.发送请求
    NSURLConnection *connect = [[NSURLConnection alloc]initWithRequest:request delegate:self];
    self.connect = connect;
}

#pragma mark ----------------------
#pragma mark NSURLConnectionDataDelegate
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    NSLog(@"didReceiveResponse");
    
    //1.得到文件的总大小(本次请求的文件数据的总大小 != 文件的总大小)
    // self.totalSize = response.expectedContentLength + self.currentSize;
    
    if (self.currentSize >0) {
        return;
    }
    
    self.totalSize = response.expectedContentLength;
    
    //2.写数据到沙盒中
    self.fullPath = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject]stringByAppendingPathComponent:@"123.jpg"];
    
    NSLog(@"%@",self.fullPath);
    
    //3.创建一个空的文件
    [[NSFileManager defaultManager] createFileAtPath:self.fullPath contents:nil attributes:nil];
    
    //NSDictionary *dict = [[NSFileManager defaultManager]attributesOfItemAtPath:self.fullPath error:nil];
    
    //4.创建文件句柄(指针)
    self.handle = [NSFileHandle fileHandleForWritingAtPath:self.fullPath];
}

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    //1.移动文件句柄到数据的末尾
    [self.handle seekToEndOfFile];
    
    //2.写数据
    [self.handle writeData:data];
    
    //3.获得进度
    self.currentSize += data.length;
    
    //进度=已经下载/文件的总大小
    NSLog(@"%f",1.0 *  self.currentSize/self.totalSize);
    self.progressView.progress = 1.0 *  self.currentSize/self.totalSize;
    //NSLog(@"%@",self.fullPath);
}

-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
}

-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    //1.关闭文件句柄
    [self.handle closeFile];
    self.handle = nil;
    
    NSLog(@"connectionDidFinishLoading");
    NSLog(@"%@",self.fullPath);
}
@end

2.  NSOutputStream输出流

#import "ViewController.h"

@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIProgressView *progressView;

@property (nonatomic, assign) NSInteger totalSize;
@property (nonatomic, assign) NSInteger currentSize;
/** 沙盒路径 */
@property (nonatomic, strong) NSString *fullPath;
/** 连接对象 */
@property (nonatomic, strong) NSURLConnection *connect;
/** 输出流*/
@property (nonatomic, strong) NSOutputStream *stream;
@end

@implementation ViewController


- (IBAction)startBtnClick:(id)sender {
    [self download];
}
- (IBAction)cancelBtnClick:(id)sender {
    [self.connect cancel];
}
- (IBAction)goOnBtnClick:(id)sender {
    [self download];
}

//内存飙升
-(void)download
{
    //1.url
    // NSURL *url = [NSURL URLWithString:@"http://imgsrc.baidu.com/forum/w%3D580/sign=54a8cc6f728b4710ce2ffdc4f3cec3b2/d143ad4bd11373f06c0b5bd1a40f4bfbfbed0443.jpg"];
    
    NSURL *url = [NSURL URLWithString:@"http://www.33lc.com/article/UploadPic/2012-10/2012102514201759594.jpg"];
    
    //2.创建请求对象
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    
    //设置请求头信息,告诉服务器值请求一部分数据range
    /*
     bytes=0-100 
     bytes=-100
     bytes=0- 请求100之后的所有数据
     */
    NSString *range = [NSString stringWithFormat:@"bytes=%zd-",self.currentSize];
    [request setValue:range forHTTPHeaderField:@"Range"];
    NSLog(@"+++++++%@",range);
    
    //3.发送请求
    NSURLConnection *connect = [[NSURLConnection alloc]initWithRequest:request delegate:self];
    self.connect = connect;
}

#pragma mark ----------------------
#pragma mark NSURLConnectionDataDelegate
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    NSLog(@"didReceiveResponse");
    
    //1.得到文件的总大小(本次请求的文件数据的总大小 != 文件的总大小)
    // self.totalSize = response.expectedContentLength + self.currentSize;
    
    if (self.currentSize >0) {
        return;
    }
    
    self.totalSize = response.expectedContentLength;
    
    //2.写数据到沙盒中
    self.fullPath = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject]stringByAppendingPathComponent:@"123.jpg"];
    
    NSLog(@"%@",self.fullPath);
    //3.创建输出流
//    NSOutputStream
//    NSInputStream
    /*
     第一个参数:文件的路径
     第二个参数:YES 追加
     特点:如果该输出流指向的地址没有文件,那么会自动创建一个空的文件
     */
    NSOutputStream *stream = [[NSOutputStream alloc]initToFileAtPath:self.fullPath append:YES];
    
    //打开输出流
    [stream open];
    self.stream = stream;
}

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    //写数据
    [self.stream write:data.bytes maxLength:data.length];
    
    //3.获得进度
    self.currentSize += data.length;
    
    //进度=已经下载/文件的总大小
    NSLog(@"%f",1.0 *  self.currentSize/self.totalSize);
    self.progressView.progress = 1.0 *  self.currentSize/self.totalSize;
    //NSLog(@"%@",self.fullPath);
}

-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
}

-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    
    //关闭流
    [self.stream close];
    self.stream = nil;
    
    NSLog(@"connectionDidFinishLoading");
    NSLog(@"%@",self.fullPath);
}
@end

---

文件上传

• 文件上传步骤

1.设置请求头

Content-Type:multipart/form-data; boundary=----WebKitFormBoundaryjv0UfA04ED44AhWx

2.按照固定的格式拼接请求体的数据

------WebKitFormBoundaryjv0UfA04ED44AhWx

Content-Disposition: form-data; name="file"; filename="Snip20160225_341.png"

Content-Type: image/png

------WebKitFormBoundaryjv0UfA04ED44AhWx

Content-Disposition: form-data; name="username"

123456

------WebKitFormBoundaryjv0UfA04ED44AhWx--

• 拼接请求体的数据格式

分隔符:----WebKitFormBoundaryjv0UfA04ED44AhWx

1)文件参数

     --分隔符

     Content-Disposition: form-data; name="file"; filename="Snip20160225_341.png"

     Content-Type: image/png(MIMEType:大类型/小类型)

     空行

     文件参数

2)非文件参数

     --分隔符

     Content-Disposition: form-data; name="username"

     空行

     123456

3)结尾标识

    --分隔符--

//文件上传步骤
/*
 1.设置请求头 
 Content-Type:multipart/form-data; boundary=----WebKitFormBoundaryjv0UfA04ED44AhWx
 2.按照固定的格式拼接请求体的数据
 
 ------WebKitFormBoundaryjv0UfA04ED44AhWx
 Content-Disposition: form-data; name="file"; filename="Snip20160225_341.png"
 Content-Type: image/png
 
 
 ------WebKitFormBoundaryjv0UfA04ED44AhWx
 Content-Disposition: form-data; name="username"
 
 123456
 ------WebKitFormBoundaryjv0UfA04ED44AhWx--
 
 */
//拼接请求体的数据格式
/*
 拼接请求体
 分隔符:----WebKitFormBoundaryjv0UfA04ED44AhWx
 1)文件参数
     --分隔符
     Content-Disposition: form-data; name="file"; filename="Snip20160225_341.png"
     Content-Type: image/png(MIMEType:大类型/小类型)
     空行
     文件参数
 2)非文件参数
     --分隔符
     Content-Disposition: form-data; name="username"
     空行
     123456
 3)结尾标识
    --分隔符--
 */
#import "ViewController.h"

#define Kboundary @"----WebKitFormBoundaryjv0UfA04ED44AhWx"
#define KNewLine [@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]

@interface ViewController ()

@end

@implementation ViewController

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [self upload];
}

-(void)upload
{
    //1.确定请求路径
    NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/upload"];
    
    //2.创建可变的请求对象
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    
    //3.设置请求方法
    request.HTTPMethod = @"POST";
    
    //4.设置请求头信息
    //Content-Type:multipart/form-data; boundary=----WebKitFormBoundaryjv0UfA04ED44AhWx
    [request setValue:[NSString stringWithFormat:@"multipart/form-data; boundary=%@",Kboundary] forHTTPHeaderField:@"Content-Type"];
    
    //5.拼接请求体数据
    NSMutableData *fileData = [NSMutableData data];
    //5.1 文件参数
    /*
     --分隔符
     Content-Disposition: form-data; name="file"; filename="Snip20160225_341.png"
     Content-Type: image/png(MIMEType:大类型/小类型)
     空行
     文件参数
     */
    [fileData appendData:[[NSString stringWithFormat:@"--%@",Kboundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [fileData appendData:KNewLine];
    
    //name:file 服务器规定的参数
    //filename:Snip20160225_341.png 文件保存到服务器上面的名称
    //Content-Type:文件的类型
    [fileData appendData:[@"Content-Disposition: form-data; name=\"file\"; filename=\"Snip20160225_341.png\"" dataUsingEncoding:NSUTF8StringEncoding]];
    [fileData appendData:KNewLine];
    [fileData appendData:[@"Content-Type: image/png" dataUsingEncoding:NSUTF8StringEncoding]];
    [fileData appendData:KNewLine];
    [fileData appendData:KNewLine];
    
    UIImage *image = [UIImage imageNamed:@"Snip20160225_341"];
    //UIImage --->NSData
    NSData *imageData = UIImagePNGRepresentation(image);
    [fileData appendData:imageData];
    [fileData appendData:KNewLine];
    
    //5.2 非文件参数
    /*
     --分隔符
     Content-Disposition: form-data; name="username"
     空行
     123456
     */
    [fileData appendData:[[NSString stringWithFormat:@"--%@",Kboundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [fileData appendData:KNewLine];
    [fileData appendData:[@"Content-Disposition: form-data; name=\"username\"" dataUsingEncoding:NSUTF8StringEncoding]];
    [fileData appendData:KNewLine];
    [fileData appendData:KNewLine];
    [fileData appendData:[@"123456" dataUsingEncoding:NSUTF8StringEncoding]];
    [fileData appendData:KNewLine];
    
    //5.3 结尾标识
    /*
     --分隔符--
     */
    [fileData appendData:[[NSString stringWithFormat:@"--%@--",Kboundary] dataUsingEncoding:NSUTF8StringEncoding]];
    
    //6.设置请求体
    request.HTTPBody = fileData;
    
    //7.发送请求
    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
       
        //8.解析数据
        NSLog(@"%@",[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding]);
    }];
}

@end

---

文件的MIMEType

获取文件的MIMEType:

• 利用NSURLConnection

- (NSString *)MIMEType:(NSURL *)url
{
    // 1.创建一个请求
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    // 2.发送请求（返回响应）
    NSURLResponse *response = nil;
    [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:nil];
    // 3.获得MIMEType
    return response.MIMEType;
}

• C语言API

- (NSString *)mimeTypeForFileAtPath:(NSString *)path
{
    if (![[[NSFileManager alloc] init] fileExistsAtPath:path]) {
        return nil;
    }
    
    CFStringRef UTI = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, (__bridge CFStringRef)[path pathExtension], NULL);
    CFStringRef MIMEType = UTTypeCopyPreferredTagWithClass (UTI, kUTTagClassMIMEType);
    CFRelease(UTI);
    if (!MIMEType) {
        return @"application/octet-stream";
    }
    return (__bridge NSString *)(MIMEType);
}

#import "ViewController.h"

#import 

@interface ViewController ()

@end

@implementation ViewController

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    //1.发送请求,可以响应头(内部有MIMEType)
    //2.百度
    //3.调用C语言的API
    //4.application/octet-stream 任意的二进制数据类型
    
    //[self getMimeType];
   NSString *mimeType= [self mimeTypeForFileAtPath:@"/Users/xiaomage/Desktop/123.h"];
    NSLog(@"%@",mimeType);
}

-(void)getMimeType
{
    
    //1.url
    NSURL *url = [NSURL fileURLWithPath:@"/Users/xiaomage/Desktop/123.h"];
    
    //2.创建请求对象
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    
    //3.发送异步请求
    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
       
        //4.获得文件的类型
        NSLog(@"%@",response.MIMEType);
    }];
    
}

- (NSString *)mimeTypeForFileAtPath:(NSString *)path
{
    if (![[[NSFileManager alloc] init] fileExistsAtPath:path]) {
        return nil;
    }
    
    CFStringRef UTI = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, (__bridge CFStringRef)[path pathExtension], NULL);
    CFStringRef MIMEType = UTTypeCopyPreferredTagWithClass (UTI, kUTTagClassMIMEType);
    CFRelease(UTI);
    if (!MIMEType) {
        return @"application/octet-stream";
    }
    return (__bridge NSString *)(MIMEType);
}
@end

多线程下载文件：开辟多个线程， 每个线程下载指定的一部分，每一部分用NSFileHandler找到指定要下载的部分，具体方法为

//设置开始下载的起始点
- (void)seekToFileOffset:(unsigned long long)offset;
//设置文件下载的长度
- (void)truncateFileAtOffset:(unsigned long long)offset;

---

文件的解压缩

第三方解压缩框架——ZipArchive：下载地址：https://github.com/ZipArchive/ZipArchive

• 需要引入libz.dylib框架
• 导入头文件Main.h
• 创建压缩文件

       1.  + (BOOL)createZipFileAtPath:(NSString *)path  withFilesAtPaths:(NSArray *)paths;

       2.  + (BOOL)createZipFileAtPath:(NSString *)path  withContentsOfDirectory:(NSString *)directoryPath;

• 解压

       

#import "ViewController.h"
#import "SSZipArchive.h"

@interface ViewController ()

@end

@implementation ViewController
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [self unzip];
}

-(void)zip
{
    NSArray *arrayM = @[
                        @"/Users/Alan/Desktop/Snip20160226_2.png",
                        @"/Users/Alan/Desktop/Snip20160226_6.png"
                        ];
    /*
     第一个参数:压缩文件的存放位置
     第二个参数:要压缩哪些文件(路径)
     */
    //[SSZipArchive createZipFileAtPath:@"/Users/Alan/Desktop/Test.zip" withFilesAtPaths:arrayM];
    [SSZipArchive createZipFileAtPath:@"/Users/Alan/Desktop/Test.zip" withFilesAtPaths:arrayM withPassword:@"123456"];
}

-(void)zip2
{
    /*
     第一个参数:压缩文件存放位置
     第二个参数:要压缩的文件夹(目录)
     */
    [SSZipArchive createZipFileAtPath:@"/Users/Alan/Desktop/demo.zip" withContentsOfDirectory:@"/Users/Alan/Desktop/demo"];
}

-(void)unzip
{
    /*
     第一个参数:要解压的文件在哪里
     第二个参数:文件应该解压到什么地方
     */
    //[SSZipArchive unzipFileAtPath:@"/Users/Alan/Desktop/demo.zip" toDestination:@"/Users/xiaomage/Desktop/xx"];
    
    [SSZipArchive unzipFileAtPath:@"/Users/Alan/Desktop/demo.zip" toDestination:@"/Users/xiaomage/Desktop/xx" progressHandler:^(NSString *entry, unz_file_info zipInfo, long entryNumber, long total) {
        NSLog(@"%zd---%zd",entryNumber,total);
        
    } completionHandler:^(NSString *path, BOOL succeeded, NSError *error) {
        
        NSLog(@"%@",path);
    }];
}


@end

+ (BOOL)unzipFileAtPath:(NSString *)path  toDestination:(NSString *)destination

---

NSURLConnection和Runloop关系

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [self newThreadDelegate2];
}

-(void)delegate1
{
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://120.25.226.186:32812/login?username=123&pwd=123&type=JSON"]];
    
    //设置代理
    //代理方法:默认是在主线程中调用的
    NSURLConnection *connect = [NSURLConnection connectionWithRequest:request delegate:self];
    
    
    //设置代理方法在哪个线程中调用
    //[NSOperationQueue alloc]init]]    开子线程
    //[NSOperationQueue mainQueue]  不能这样设置
    [connect setDelegateQueue:[[NSOperationQueue alloc]init]];
    //[connect setDelegateQueue:[NSOperationQueue mainQueue]];
    
    NSLog(@"-------");
}

-(void)delegate2
{
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://120.25.226.186:32812/login?username=123&pwd=123&type=JSON"]];
    
    //设置代理
    //代理方法:默认是在主线程中调用的
    NSURLConnection *connect = [[NSURLConnection alloc]initWithRequest:request delegate:self startImmediately:NO];

    
    [connect setDelegateQueue:[[NSOperationQueue alloc]init]];
    
    //开始发送请求
    [connect start];
    NSLog(@"-------");
}

-(void)newThreadDelegate1
{
   dispatch_async(dispatch_get_global_queue(0, 0), ^{
      
       NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://120.25.226.186:32812/login?username=123&pwd=123&type=JSON"]];
       
       //设置代理
       //代理方法:默认是在主线程中调用的
       //该方法内部其实会将connect对象作为一个source添加到当前的runloop中,指定运行模式为默认
       NSURLConnection *connect = [NSURLConnection connectionWithRequest:request delegate:self];
       
       //设置代理方法在哪个线程中调用
       [connect setDelegateQueue:[[NSOperationQueue alloc]init]];
       
       //[[NSRunLoop currentRunLoop] runMode:UITrackingRunLoopMode beforeDate:[NSDate dateWithTimeIntervalSinceNow:1000]];
       [[NSRunLoop currentRunLoop]run];
       
         NSLog(@"---%@----",[NSThread currentThread]);
   });
  
}

-(void)newThreadDelegate2
{
    dispatch_async(dispatch_get_global_queue(0, 0), ^{
        NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://120.25.226.186:32812/login?username=123&pwd=123&type=JSON"]];
        
        //设置代理
        //代理方法:默认是在主线程中调用的
        NSURLConnection *connect = [[NSURLConnection alloc]initWithRequest:request delegate:self startImmediately:NO];
        
        [connect setDelegateQueue:[[NSOperationQueue alloc]init]];
        
        //开始发送请求
        //如如果connect对象没有添加到runloop中,那么该方法内部会自动的添加到runloop
        //注意:如果当前的runloop没有开启,那么该方法内部会自动获得当前线程对应的runloop对象并且开启
        [connect start];
        NSLog(@"---%@----",[NSThread currentThread]);
    });
}

#pragma mark ----------------------
#pragma mark NSURLConnectionDataDelegate
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    NSLog(@"didReceiveResponse---%@",[NSThread currentThread]);
}

@end