这篇博客用于实现iOS客户端通过POST请求，将图片上传到服务器上。服务器端语言采用PHP，服务器环境使用MAMP搭建。先使用浏览器测试图片是否可以上传，浏览器测试成功之后再测试iOS客户端是否可以成功上传图片。
服务端代码：
upload_file.php
<?php if ((($_FILES["file"]["type"] == "image/gif") || ($_FILES["file"]["type"] == "image/jpeg") || ($_FILES["file"]["type"] == "image/pjpeg")) && ($_FILES["file"]["size"] < 20000000)) { if ($_FILES["file"]["error"] > 0) { echo "Return Code: " . $_FILES["file"]["error"] . "<br />"; } else { echo "Upload: " . $_FILES["file"]["name"] . "<br />"; echo "Type: " . $_FILES["file"]["type"] . "<br />"; echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb<br />"; echo "Temp file: " . $_FILES["file"]["tmp_name"] . "<br />"; if (file_exists("upload/" . $_FILES["file"]["name"])) { echo $_FILES["file"]["name"] . " already exists. "; } else { move_uploaded_file($_FILES["file"]["tmp_name"], "upload/" . $_FILES["file"]["name"]); echo "Stored in: " . "upload/" . $_FILES["file"]["name"]; } } } else { echo "Invalid file"; } ?>
浏览器测试代码：
upload.html
<html> <body> <form action="upload_file.php" method="post" enctype="multipart/form-data"> <label for="file">Filename:</label> <input type="file" name="file" id="file" /> <br /> <input type="submit" name="submit" value="Submit" /> </form> </body> </html>
MAMP服务器的目录结构如下：(新建一个upload文件夹用于存放图片，将upload文件夹和upload.html、upload_file.php放在同一个目录下)
iOS客户端代码：
ViewController.m
#import "ViewController.h" static NSString *boundry = @"----------V2ymHFg03ehbqgZCaKO6jy";//设置边界 @interface ViewController ()<UINavigationControllerDelegate, UIImagePickerControllerDelegate,NSURLSessionTaskDelegate> @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. } #pragma mark-打开相册 - (IBAction)openAlbumClicked:(UIButton *)sender { UIImagePickerController *picController = [[UIImagePickerController alloc] init]; picController.delegate = self; [self presentViewController:picController animated:YES completion:nil]; } #pragma mark-代理方法 - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{ NSLog(@"选择图片: %@",info); [self uploadDataWithImage:info[@"UIImagePickerControllerOriginalImage"]]; [picker dismissViewControllerAnimated:YES completion:nil]; } /** 上传图片 */ - (void)uploadDataWithImage:(UIImage *)img{ NSURL *url = [NSURL URLWithString:@"http://10.51.3.160:8888/upload_file.php"]; NSMutableURLRequest *urlRequest = [[NSMutableURLRequest alloc] initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:30]; //设置Method urlRequest.HTTPMethod = @"POST"; //4.设置请求头 //在请求头中添加content-type字段 NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; charset=utf-8;boundary=%@",boundry]; [urlRequest setValue:contentType forHTTPHeaderField:@"Content-Type"]; NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration]; //NSURLSession NSURLSession *session = [NSURLSession sessionWithConfiguration:config delegate:self delegateQueue:[[NSOperationQueue alloc]init]]; //定义上传操作 NSURLSessionUploadTask *uploadTask = [session uploadTaskWithRequest:urlRequest fromData:[self getBodydataWithImage:img] completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) { NSLog(@"响应结果:%@", response); NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; NSLog(@"返回数据: %@",str); }]; [uploadTask resume]; } - (NSData *)getBodydataWithImage:(UIImage *)image { //把文件转换为NSData NSData *fileData = UIImageJPEGRepresentation(image, 0.8); //文件名 NSString *fileName=@"test"; //1.构造body string NSMutableString *bodyString = [[NSMutableString alloc] init]; //2.拼接body string //(1)file_name [bodyString appendFormat:@"--%@ ",boundry]; [bodyString appendFormat:@"Content-Disposition: form-data; name="FileName" "]; [bodyString appendFormat:@"Content-Type: text/plain; charset="utf-8" "]; [bodyString appendFormat:@"aaa%@.jpg ",fileName]; //(2)PostID // [bodyString appendFormat:@"--%@ ",boundry]; // [bodyString appendFormat:@"Content-Disposition: form-data; name="PostID" "]; // [bodyString appendFormat:@"Content-Type: text/plain; charset="utf-8" "]; // [bodyString appendFormat:@"%@ ",self.uuID]; //(3)pic [bodyString appendFormat:@"--%@ ",boundry]; [bodyString appendFormat:@"Content-Disposition: form-data; name="file"; filename="%@.jpg" ",fileName]; [bodyString appendFormat:@"Content-Type: image/jpeg "]; //[bodyString appendFormat:@"Content-Type: application/octet-stream "]; //3.string --> data NSMutableData *bodyData = [NSMutableData data]; //拼接的过程 //前面的bodyString, 其他参数 [bodyData appendData:[bodyString dataUsingEncoding:NSUTF8StringEncoding]]; //图片数据 [bodyData appendData:fileData]; //4.结束的分隔线 NSString *endStr = [NSString stringWithFormat:@" --%@-- ",boundry]; //拼接到bodyData最后面 [bodyData appendData:[endStr dataUsingEncoding:NSUTF8StringEncoding]]; return bodyData; } - (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didSendBodyData:(int64_t)bytesSent totalBytesSent:(int64_t)totalBytesSent totalBytesExpectedToSend:(int64_t)totalBytesExpectedToSend{ CGFloat progress = totalBytesSent * 1.0 / totalBytesExpectedToSend; NSLog(@"上传进度:%f%%",progress*100); } /* 上传成功 */ - (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error{ NSLog(@"上传成功! Error:%@",error); } @end