Form-based File Upload in HTML（RFC-1867）

#import "RootViewController.h"
#define URL @"http://localhost:8080/TestOne/upload3.jsp"

@implementation RootViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    button.frame = CGRectMake(100, 100, 100, 50);
    [button setTitle:@"发送图片" forState:0];
    button.backgroundColor = [UIColor groupTableViewBackgroundColor];
    [self.view addSubview:button];
    [button addTarget:self action:@selector(postImageAction:) forControlEvents:7];
}

-(void)postImageAction:(UIButton *)sender
{
    //分界线的标示符，用于区分每一条
    NSString *TWITTERFO_FORM_BOUNDARY = @"AaB03x";

    //根据url初始化request
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:
                                     [NSURL URLWithString:URL]
                                                            cachePolicy:NSURLRequestReloadIgnoringCacheData
                                                       timeoutInterval:10];
    //分界线 --AaB03x
    NSString *MPboundary =     [[NSString alloc] initWithFormat:@"--%@",TWITTERFO_FORM_BOUNDARY];
    //结束符AaB03x--
    NSString *endMPboundary = [[NSString alloc]initWithFormat:@"%@--",MPboundary];
    //字典存多少张图片
    NSDictionary *params = [NSDictionary dictionaryWithObjectsAndKeys:[UIImage imageNamed:@"163.png"],@"File1",@"huen",@"user",nil];
    //要上传图片
    UIImage *image = [params objectForKey:@"File1"];
    NSData *data = UIImagePNGRepresentation(image);
    //http body 的字符串
    NSMutableString *body = [[NSMutableString alloc]init];
    //参数的所有key的
    NSArray *keys = [params allKeys];
    for (int i = 0; i params count]; i++)
    {
        //得到当前key
        NSString *key = [keys objectAtIndex:i];
        //如果key不是图片类型
        if (![key isEqualToString:@"File1"])
        {
            //添加分界线，换行
            [body appendFormat:@"%@\r\n",MPboundary];
            //添加字段名称，换2行
            [body appendFormat:@"Content-Disposition:form-data;name=\"%@\"\r\n\r\n",key];
            //添加字段的值
            [body appendFormat:@"%@\r\n",[params objectForKey:key]];
        }
    }
    ///////////////////////////////传图////////////////////////////////////////////////
    //添加分界线换行
    [body appendFormat:@"%@\r\n",MPboundary];
    //给据heml控件neme的值声明File1字段，文件名为163.png
    [body appendFormat:@"Content-Disposition:form-data;name=\"File1\";filename=\"163.png\"\r\n"];
    //声明上传文件的格式
    [body appendFormat:@"Content-Type:image/png\r\n\r\n"];
    //声明结束符
    NSString *end = [[NSString alloc]initWithFormat:@"\r\n%@",endMPboundary];
    ///////////////////////////////////////////////////////////////////////////////////
    //声明myRequestData,用来放入http body
    NSMutableData *myRequestData = [NSMutableData data];
    //将body字符串转化为UTF-8
    [myRequestData appendData:[body dataUsingEncoding:NSUTF8StringEncoding]];
    //将image加入data
    [myRequestData appendData:data];
    //加入结束符--AaB03x--
    [myRequestData appendData:[end dataUsingEncoding:NSUTF8StringEncoding]];
    ///////////////////////////////设置Content////////////////////////////////////////
    //设置httpHeader中Content-Type的值
    NSString *content = [[NSString alloc]initWithFormat:@"multipart/form-data;boundary=%@",TWITTERFO_FORM_BOUNDARY];
    //设置HttpHeader
    [request setValue:content forHTTPHeaderField:@"Content-Type"];
    //设置Content-Length
    [request setValue:[NSString stringWithFormat:@"%d",[myRequestData length]] forHTTPHeaderField:@"Content-Length"];
    //设置Http body
    [request setHTTPBody:myRequestData];
    //http Method
    [request setHTTPMethod:@"POST"];
    
    NSError * err;
    NSHTTPURLResponse * response;
    NSData *urlData = [NSURLConnection sendSynchronousRequest:request
                                            returningResponse:&response
                                                        error:&err];

    NSString * responseStr = [[NSString alloc] initWithData:urlData
                                                   encoding:NSUTF8StringEncoding];
    NSLog(@"responseStr = %@",responseStr);
    // 打印回应和错误信息
    NSLog(@"response = %@",[NSHTTPURLResponse localizedStringForStatusCode:[response statusCode]]);
}

@end