A.文件上傳

思路：

發(fā)送文件數(shù)據(jù)給服務(wù)器

使用post請求

必須手動設(shè)置請求頭: 內(nèi)容大小Content-Length & 內(nèi)容類型 Content-Type

請求體：文件數(shù)據(jù)

文件上傳的格式要求十分嚴格，必須嚴格遵守

由于是一次性加載文件到內(nèi)存上傳，所以只能用于小文件上傳

B.實現(xiàn)

1.設(shè)置POST請求

（1）使用POST請求方法

（2）設(shè)置請求頭

設(shè)置內(nèi)容長度、內(nèi)容類型、分割線

（3）設(shè)置請求體

NSMutableData *body = [NSMutableData data];

分割線 + 換行

內(nèi)容描述 + 換行

內(nèi)容類型 + 換行

換行

文件二進制數(shù)據(jù) + 換行

分割線–

multipart/form-data 中的內(nèi)容

Image(46)

例如使用chrome上傳一張圖片：

5A66D35E-E958-49A9-AD92-9C54E4CCFA83

（4）使用本地請求獲取某種文件類型的MIMEType

/** 取得本地文件的MIMEType */

- (void) getMIMEType {

// Socket 實現(xiàn)斷點上傳

//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"}];

// 給本地文件發(fā)送一個請求

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":@"tom", @"type":@"xml"}];

附：常見文件類型的MIMEType

Image(47)

ViewController.m

UploadFileDemo

#import "ViewController.h"

#define UTF8Encode(str) [str dataUsingEncoding:NSUTF8StringEncoding]

@interface ViewController ()

- (IBAction)upload;

@end

@implementation ViewController

 - (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

 }

 - (void)didReceiveMemoryWarning {

 [super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated. }

- (IBAction)upload {

 UIImage *image = [UIImage imageNamed:@"IMG_0413"];

NSData *imageData = UIImagePNGRepresentation(image);

 [self upload:@"uploadedFile" filename:@"IMG_0413.PNG" mimeType:@"image/png" data:imageData parmas:nil];

}

- (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://192.168.0.21:8080/MyTestServer/upload"];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

request.HTTPMethod = @"POST";

// 設(shè)置請求體

NSMutableData *body = [NSMutableData data];

/***************文件參數(shù)***************/

／/ 參數(shù)開始的標志

[body appendData:UTF8Encode(@"--HelloVoidWorldBoundary\r\n")];

// name : 指定參數(shù)名(必須跟服務(wù)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:UTF8Encode(disposition)];

NSString *type = [NSString stringWithFormat:@"Content-Type: %@\r\n", mimeType];

 [body appendData:UTF8Encode(type)];

 [body appendData:UTF8Encode(@"\r\n")];

 [body appendData:data];

 [body appendData:UTF8Encode(@"\r\n")];

/***************普通參數(shù)***************/

 [params enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {        // 參數(shù)開始的標志

[body appendData:UTF8Encode(@"--HelloVoidWorldBoundary\r\n")];

NSString *disposition = [NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n", key];

[body appendData:UTF8Encode(disposition)];

[body appendData:UTF8Encode(@"\r\n")];

[body appendData:UTF8Encode(obj)];

[body appendData:UTF8Encode(@"\r\n")];

}];

/***************參數(shù)結(jié)束***************/

// HelloVoidWorldBoundary--\r\n

[body appendData:UTF8Encode(@"--HelloVoidWorldBoundary--\r\n")];

request.HTTPBody = body;

// 設(shè)置請求頭

// 請求體的長度

[request setValue:[NSString stringWithFormat:@"%zd", body.length] forHTTPHeaderField:@"Content-Length"];

// 聲明這個POST請求是個文件上傳

[request setValue:@"multipart/form-data; boundary=HelloVoidWorldBoundary" forHTTPHeaderField:@"Content-Type"];

// 發(fā)送請求

[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {

NSLog(@"開始上傳~~~");

 if (data) {

           NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];            NSLog(@"%@", dict);        } else {

            NSLog(@"上傳失敗");        }

    }];

 }

 /** 取得本地文件的MIMEType */

 - (void) getMIMEType {

 //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"}];

 // 給本地文件發(fā)送一個請求

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":@"tom", @"type":@"xml"}]; }