iOS实现文件上传功能

#import "XNUploadFile.h" 
 
#define kTimeOut 5.0f 
 
@implementation XNUploadFile 
/** 分隔字符串 */ 
static NSString *boundaryStr = @"--"; 
/** 本次上传标示字符串 */ 
static NSString *randomIDStr; 
/** 上传(php)脚本中，接收文件字段 */ 
static NSString *uploadID; 
 
- (instancetype)init 
{ 
 self = [super init]; 
 if (self) { 
 /** 本次上传标示字符串 */ 
 randomIDStr = @"itcastupload"; 
 /** 上传(php)脚本中，接收文件字段 */ 
 // 可以咨询公司的网站开发程序员 
 // 或者用FireBug自己跟踪调试 
 uploadID = @"uploadFile"; 
 } 
 return self; 
} 
 
#pragma mark - 成员方法. 用NSURLSession来完成上传 
- (void)uploadFile:(NSString *)path fileName:(NSString *)fileName completion:(void (^)(NSString *string))completion 
{ 
 // 1. url 提示：真正负责文件上传的是php文件，而不是html文件 
 NSURL *url = [NSURL URLWithString:@"http://localhost/new/post/upload.php"]; 
 
 // 2. request 
 NSURLRequest *request = [self requestForUploadURL:url uploadFileName:fileName localFilePath:path]; 
 
 // 3. session（回话） 
 // 全局网络回话，为了方便程序员使用网络服务 
 NSURLSession *session = [NSURLSession sharedSession]; 
 
 // 4. 数据任务-> 任务都是由回话发起的 
 /** URLSession的任务，默认都是在其他线程工作的，默认都是异步的 */ 
 [[session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { 
  
 id result = [NSJSONSerialization JSONObjectWithData:data options:0 error:NULL]; 
  
 NSLog(@"%@ %@", result, [NSThread currentThread]); 
  
 dispatch_async(dispatch_get_main_queue(), ^{ 
  if (completion) { 
  completion(@"下载完成"); 
  } 
 }); 
 }] resume]; 
 
 // NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { 
 // 
 // id result = [NSJSONSerialization JSONObjectWithData:data options:0 error:NULL]; 
 // 
 // NSLog(@"%@ %@", result, [NSThread currentThread]); 
 // 
 // dispatch_async(dispatch_get_main_queue(), ^{ 
 //  if (completion) { 
 //  completion(@"下载完成"); 
 //  } 
 // }); 
 // }]; 
 // 
 // // 5. 启动任务 
 // [task resume]; 
} 
 
#pragma mark - 私有方法 ： 拼字符串 
/** 拼接顶部字符串 */ 
- (NSString *)topStringWithMimeType:(NSString *)mimeType uploadFile:(NSString *)uploadFile 
{ 
 NSMutableString *strM = [NSMutableString string]; 
 
 [strM appendFormat:@"%@%@\n", boundaryStr, randomIDStr]; 
 [strM appendFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"%@\"\n", uploadID, uploadFile]; 
 [strM appendFormat:@"Content-Type: %@\n\n", mimeType]; 
 
 NSLog(@"顶部字符串：%@", strM); 
 return [strM copy]; 
} 
 
/** 拼接底部字符串 */ 
- (NSString *)bottomString 
{ 
 NSMutableString *strM = [NSMutableString string]; 
 
 [strM appendFormat:@"%@%@\n", boundaryStr, randomIDStr]; 
 [strM appendString:@"Content-Disposition: form-data; name=\"submit\"\n\n"]; 
 [strM appendString:@"Submit\n"]; 
 [strM appendFormat:@"%@%@--\n", boundaryStr, randomIDStr]; 
 
 NSLog(@"底部字符串：%@", strM); 
 return [strM copy]; 
} 
 
/** 指定全路径文件的mimeType */ 
- (NSString *)mimeTypeWithFilePath:(NSString *)filePath 
{ 
 // 1. 判断文件是否存在 
 if (![[NSFileManager defaultManager] fileExistsAtPath:filePath]) { 
 return nil; 
 } 
 
 // 2. 使用HTTP HEAD方法获取上传文件信息 
 NSURL *url = [NSURL fileURLWithPath:filePath]; 
 NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url]; 
 
 // 3. 调用同步方法获取文件的MimeType 
 NSURLResponse *response = nil; 
 [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:NULL]; 
 
 return response.MIMEType; 
} 
 
/** 上传文件网络请求 */ 
- (NSURLRequest *)requestForUploadURL:(NSURL *)url uploadFileName:(NSString *)fileName localFilePath:(NSString *)filePath 
{ 
 // 0. 获取上传文件的mimeType 
 NSString *mimeType = [self mimeTypeWithFilePath:filePath]; 
 if (!mimeType) return nil; 
 
 // 1. 拼接要上传的数据体 
 NSMutableData *dataM = [NSMutableData data]; 
 [dataM appendData:[[self topStringWithMimeType:mimeType uploadFile:fileName] dataUsingEncoding:NSUTF8StringEncoding]]; 
 // 拼接上传文件本身的二进制数据 
 [dataM appendData:[NSData dataWithContentsOfFile:filePath]]; 
 [dataM appendData:[[self bottomString] dataUsingEncoding:NSUTF8StringEncoding]]; 
 
 // 2. 设置请求 
 NSMutableURLRequest *requestM = [NSMutableURLRequest requestWithURL:url cachePolicy:0 timeoutInterval:kTimeOut]; 
 // 1> 设定HTTP请求方式 
 requestM.HTTPMethod = @"POST"; 
 // 2> 设置数据体 
 requestM.HTTPBody = dataM; 
 // 3> 指定Content-Type 
 NSString *typeStr = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", randomIDStr]; 
 [requestM setValue:typeStr forHTTPHeaderField:@"Content-Type"]; 
 // 4> 指定数据长度 
 NSString *lengthStr = [NSString stringWithFormat:@"%@", @([dataM length])]; 
 [requestM setValue:lengthStr forHTTPHeaderField:@"Content-Length"]; 
 
 return [requestM copy]; 
} 

- (void)putFile 
{ 
 // 1. url 最后一个是要上传的文件名 
 NSURL *url = [NSURL URLWithString:@"http://localhost/uploads/abcd"]; //abcd为文件名 
 
 // 2. request 
 NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url]; 
 request.HTTPMethod = @"PUT"; 
// request.HTTPMethod = @"DELETE"; 
 
 // 设置用户授权 
 // BASE64编码：一种对字符串和二进制数据进行编码的一种“最常用的网络编码方式”，此编码可以将二进制数据转换成字符串！ 
 // 是很多加密算法的底层算法 
 // BASE64支持反编码，是一种双向的编码方案 
 NSString *authStr = @"admin:123"; 
 NSString *authBase64 = [NSString stringWithFormat:@"Basic %@", [self base64Encode:authStr]]; 
 [request setValue:authBase64 forHTTPHeaderField:@"Authorization"]; 
 
 // 3. URLSession 
 NSURLSession *session = [NSURLSession sharedSession]; 
 
 // 4. 由session发起任务 
 NSURL *localURL = [[NSBundle mainBundle] URLForResource:@"001.png" withExtension:nil]; 
 [[session uploadTaskWithRequest:request fromFile:localURL completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { 
  
 NSString *result = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; 
  
 NSLog(@"sesult---> %@ %@", result, [NSThread currentThread]); 
 }] resume]; 
} 
 
- (NSString *)base64Encode:(NSString *)str 
{ 
 // 1. 将字符串转换成二进制数据 
 NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding]; 
 
 // 2. 对二进制数据进行base64编码 
 NSString *result = [data base64EncodedStringWithOptions:0]; 
 
 NSLog(@"base464--> %@", result); 
 
 return result; 
}