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:\n%@",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:];

    //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:\n%@",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:@"--%@\r\n",boundry];

    [bodyString appendFormat:@"Content-Disposition: form-data; name=\"FileName\"\r\n"];

    [bodyString appendFormat:@"Content-Type: text/plain; charset=\"utf-\"\r\n\r\n"];

    [bodyString appendFormat:@"aaa%@.jpg\r\n",fileName];

    //(2)PostID

//    [bodyString appendFormat:@"--%@\r\n",boundry];

//    [bodyString appendFormat:@"Content-Disposition: form-data; name=\"PostID\"\r\n"];

//    [bodyString appendFormat:@"Content-Type: text/plain; charset=\"utf-8\"\r\n\r\n"];

//    [bodyString appendFormat:@"%@\r\n",self.uuID];

    //(3)pic

    [bodyString appendFormat:@"--%@\r\n",boundry];

    [bodyString appendFormat:@"Content-Disposition: form-data; name=\"file\"; filename=\"%@.jpg\"\r\n",fileName];

    [bodyString appendFormat:@"Content-Type: image/jpeg\r\n\r\n"];

    //[bodyString appendFormat:@"Content-Type: application/octet-stream\r\n\r\n"];

    //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:@"\r\n--%@--\r\n",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*);

}

/*

 上传成功

 */

- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error{

    NSLog(@"上传成功! Error:%@",error);

}

@end

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