NSURLConnection文件上传&&解压缩

文件上传的步骤

• 设置请求头

[request setValue:[NSString stringWithFormat:@"multipart/form-data; boundary=%@", 分割线] forHTTPHeaderField:@"Content-Type"];

• 设置请求体

  • 非文件参数
    –分割线\r\n
    Content-Disposition: form-data; name=”参数名“\r\n
    \r\n
    参数值
    \r\n
  • 文件参数
    –分割线\r\n
    Content-Disposition: form-data; name=”参数名“; filename=”文件名“\r\n
    Content-Type: 文件的MIMEType\r\n
    \r\n
    文件数据
    \r\n

• 参数结束的标记
  –分割线–\r\n

请求头请求体的样式

• 请求头
  
• 请求体
  

文件上传的代码实现

#define AHBoundary @"AHUAN" // 分割线
#define AHEncode(string) [string dataUsingEncoding:NSUTF8StringEncoding]
#define AHNewLine [@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    // 创建请求
    NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/upload"];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    request.HTTPMethod = @"POST";

    // 设置请求头(告诉告诉服务器,这是一个文件上传的请求)
    [request setValue:[NSString stringWithFormat:@"multipart/form-data; boundary=%@", AHBoundary] forHTTPHeaderField:@"Content-Type"];

    // 设置请求体
    NSMutableData *body = [NSMutableData data];

    // 文件参数

    // 分割线
    [body appendData:AHEncode(@"--")];
    [body appendData:AHEncode(AHBoundary)];
    [body appendData:AHNewLine];

    // 文件参数名
    [body appendData:AHEncode([NSString stringWithFormat:@"Content-Disposition: form-data; name=\"file\"; filename=\"placeholder.png\""])];
    [body appendData:AHNewLine];

    // 文件的类型
    [body appendData:AHEncode([NSString stringWithFormat:@"Content-Type: image/png"])];
    [body appendData:AHNewLine];

    // 文件数据
    [body appendData:AHNewLine];

    // UIImageJPEGRepresentation(<#UIImage *image#>, <#CGFloat compressionQuality#>)
    UIImage *image = [UIImage imageNamed:@"placeholder"];
    [body appendData:UIImagePNGRepresentation(image)];
    // [body appendData:[NSData dataWithContentsOfFile:@"/Users/ahuan/Desktop/placeholder.png"]];

    [body appendData:AHNewLine];

    // 非文件参数
    // 分割线
    [body appendData:AHEncode(@"--")];
    [body appendData:AHEncode(AHBoundary)];
    [body appendData:AHNewLine];

    // 参数名
    [body appendData:AHEncode([NSString stringWithFormat:@"Content-Disposition: form-data; name=\"username\""])];
    [body appendData:AHNewLine];

    // 参数值
    [body appendData:AHNewLine];
    [body appendData:AHEncode(@"AHUAN")];
    [body appendData:AHNewLine];

    // 结束标记
    [body appendData:AHEncode(@"--")];
    [body appendData:AHEncode(AHBoundary)];
    [body appendData:AHEncode(@"--")];
    [body appendData:AHNewLine];

    request.HTTPBody = body;

    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
        // NSLog(@"%@", [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]);
        NSLog(@"%@", [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil]);
    }];
}

@end

获取文件的Content-Type类型

两种方式实现

/** * 获取文件的Content-Type类型 *  @param filePath 文件的路径 */
- (NSString *)getMIMEType:(NSString *)filePath
{
    NSURLResponse *response = nil;
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL fileURLWithPath:filePath]];
    [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:nil];
    return response.MIMEType;
}

// 这种方式需要导入MobileCoreServices.framework框架
+ (NSString *)mimeTypeForFileAtPath:(NSString *)path
{
    if (![[NSFileManager defaultManager] 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;
}

第三方解压缩框架–SSZipArchive

• CocoaPods的导入SSZipArchive
• 创建压缩文件

[SSZipArchive createZipFileAtPath:<#(NSString *)#> withFilesAtPaths:<#(NSArray *)#>];
[SSZipArchive createZipFileAtPath:<#(NSString *)#> withContentsOfDirectory:<#(NSString *)#>];

• 解压

    [SSZipArchive unzipFileAtPath:<#(NSString *)#> toDestination:<#(NSString *)#>];

CFStringRef 和 NSString之间的转化

CFStringRef str;
NSString *str2 = (__bridge NSString *)str;