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; }