IOS-网络（文件上传）

 //
 //  ViewController.m
 //  IOS_0206_文件上传
 //
 //  Created by ma c on 16/2/6.
 //  Copyright © 2016年 博文科技. All rights reserved.
 //

 #import "ViewController.h"
 #define BWFileBoundary @"----------BowenKeJi"
 #define BWNewLine @"\r\n"
 #define BWEncode(str) [str dataUsingEncoding:NSUTF8StringEncoding]

 @interface ViewController ()

 @end

 @implementation ViewController

 /*
  一、文件上传的概括
  参数1
  参数2
  结束标记3

  --------------------------------------------------------------
  二、文件上传的格式

  1.文件参数
  BowenKeJi

  Content-Disposition: form-data; name="参数名"; filename="文件名"

  Content-Type: 文件类型/MIMEType

  文件具体数据

  2.非文件参数
  BowenKeJi

  Content-Disposition: form-data; name="参数名"

  参数值

  3.结束标记
  BowenKeJi--

  -------------------------------------------------------------------
  三、文件的MIMEType
  1.百度搜索
  2.apache-tomcat-版本号/conf/web.xml
  3.加载文件时通过Reponse获得
  -------------------------------------------------------------------
  */

 - (void)viewDidLoad {
     [super viewDidLoad];

     self.view.backgroundColor = [UIColor cyanColor];

     NSString *name = @"jack";
     [self test:&name];
     NSLog(@"%@",name);

 }

 ///在方法中更改字符串的值
 - (void)test:(NSString **)str
 {
     *str = @"bowen";
 }

 - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
 {
     //[self upload];

     //文件参数
     NSDictionary *params = @{
                              @"username" : @"bowen"
                              };
     //文件数据
 //    UIImage *image = [UIImage imageNamed:@"abc"];
 //    NSData *imgData = UIImageJPEGRepresentation(image, 1);
 //    [self upload:@"text.png" AndMIMEType:@"image/png" AndfileData:imgData AndParams:params];

     NSURL *url = [[NSBundle mainBundle] URLForResource:@"abc" withExtension:@"jpg"];
     NSData *data = [NSData dataWithContentsOfURL:url];
     NSString *MIMEType = [self MIMEType:url];
     [self upload:@"cba.jpg" AndMIMEType:MIMEType AndfileData:data AndParams:params];

 //    NSURL *url1 = [[NSBundle mainBundle] URLForResource:@"abc" withExtension:@"jpg"];
 //    //NSURL *url1 = [NSURL fileURLWithPath:@"/Users/apple/Desktop/hehe.text"];
 //    NSString *mimeType = [self MIMEType:url1];
 //    NSLog(@"%@",mimeType);

 }

 ///文件的MIMEType
 - (NSString *)MIMEType:(NSURL *)url
 {
     //1.创建一个请求
     NSURLRequest *request = [NSURLRequest requestWithURL:url];

     NSURLResponse *response = nil;
     //2.发送请求（返回响应）
     [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:nil];
     //3.获得MIMEType
     return response.MIMEType;
 }

 ///文件上传未封装
 - (void)upload
 {
      // 1.请求路径
      NSURL *url = [NSURL URLWithString:@"http://localhost:8080/MJServer/upload"];
      // 2.创建一个POST请求
      NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
      request.HTTPMethod = @"POST";
      // 2.设置请求头（告诉服务器这次上传的是文件数据）
      NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",BWFileBoundary];
      [request setValue:contentType forHTTPHeaderField:@"Content-Type"];
      // 3.设置请求体
      NSMutableData *body = [NSMutableData data];

      // 4.1文件参数
      [body appendData:BWEncode(@"--")];
      [body appendData:BWEncode(BWFileBoundary)];
      [body appendData:BWEncode(BWNewLine)];

      [body appendData:BWEncode(@"Content-Disposition: form-data; name=\"file\"; filename=\"ts.jpg\"")];
      [body appendData:BWEncode(BWNewLine)];

      [body appendData:BWEncode(@"Content-Type: image/jpg")];
      [body appendData:BWEncode(BWNewLine)];

      //具体内容
      [body appendData:BWEncode(BWNewLine)];
      UIImage *image = [UIImage imageNamed:@"abc"];
      NSData *imgData = UIImageJPEGRepresentation(image, );
      [body appendData:imgData];
      [body appendData:BWEncode(BWNewLine)];

      // 4.2非文件参数（用户名参数）
      [body appendData:BWEncode(@"--")];
      [body appendData:BWEncode(BWFileBoundary)];
      [body appendData:BWEncode(BWNewLine)];

      [body appendData:BWEncode(@"Content-Disposition: form-data; name=\"username\"")];
      [body appendData:BWEncode(BWNewLine)];

      [body appendData:BWEncode(BWNewLine)];
      [body appendData:BWEncode(@"bowen")];
      [body appendData:BWEncode(BWNewLine)];

      // 4.3结束标记
      [body appendData:BWEncode(@"--")];
      [body appendData:BWEncode(BWFileBoundary)];
      [body appendData:BWEncode(@"--")];
      [body appendData:BWEncode(BWNewLine)];

      request.HTTPBody = body;

      // 5.发送请求
      [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
      NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];
      NSLog(@"%@",dict);
      }];
 }

 ///文件上传封装
 - (void)upload:(NSString *)filename AndMIMEType:(NSString *)mimeType AndfileData:(NSData *)fileData
    AndParams:(NSDictionary *)dict
 {
     // 1.请求路径
     NSURL *url = [NSURL URLWithString:@"http://localhost:8080/MJServer/upload"];
     // 2.创建一个POST请求
     NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
     request.HTTPMethod = @"POST";
     // 2.设置请求头（告诉服务器这次上传的是文件数据）
     NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",BWFileBoundary];
     [request setValue:contentType forHTTPHeaderField:@"Content-Type"];
     // 3.设置请求体
     NSMutableData *body = [NSMutableData data];

     // 4.1文件参数
     [body appendData:BWEncode(@"--")];
     [body appendData:BWEncode(BWFileBoundary)];
     [body appendData:BWEncode(BWNewLine)];
     NSString *disposition = [NSString stringWithFormat:@"Content-Disposition: form-data; name=\"file\"; filename=\"%@\"",filename];
     [body appendData:BWEncode(disposition)];
     [body appendData:BWEncode(BWNewLine)];

     NSString *type = [NSString stringWithFormat:@"Content-Type: %@",mimeType];
     [body appendData:BWEncode(type)];
     [body appendData:BWEncode(BWNewLine)];

     //具体内容
     [body appendData:BWEncode(BWNewLine)];
     [body appendData:fileData];
     [body appendData:BWEncode(BWNewLine)];

     // 4.2非文件参数（用户名参数）

     [dict enumerateKeysAndObjectsUsingBlock:^(id  _Nonnull key, id  _Nonnull obj, BOOL * _Nonnull stop) {
         [body appendData:BWEncode(@"--")];
         [body appendData:BWEncode(BWFileBoundary)];
         [body appendData:BWEncode(BWNewLine)];

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

         [body appendData:BWEncode(disposition)];
         [body appendData:BWEncode(BWNewLine)];

         [body appendData:BWEncode(BWNewLine)];
         [body appendData:BWEncode([obj description])];
         [body appendData:BWEncode(BWNewLine)];

     }];
     // 4.3结束标记
     [body appendData:BWEncode(@"--")];
     [body appendData:BWEncode(BWFileBoundary)];
     [body appendData:BWEncode(@"--")];
     [body appendData:BWEncode(BWNewLine)];

     request.HTTPBody = body;

     // 5.发送请求
     [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
         NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];
         NSLog(@"%@",dict);
     }];
 }
 @end