iOS通过HTTP POST上传文件

iOS通过HTTP POST上传文件，代码如下：

 

//创建Request对象
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setURL:[NSURL URLWithString:urlStr]];
    [request setHTTPMethod:@"POST"];
    NSMutableData *body = [NSMutableData data];

//设置表单项分隔符
    NSString *boundary = @"---------------------------14737809831466499882746641449";

//设置内容类型
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
    [request addValue:contentType forHTTPHeaderField: @"Content-Type"];

    //写入图片的内容
    [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"PIC_DATA1.jpg\"\r\n",@"PIC_DATA1"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[@"Content-Type: image/jpeg\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[infoDic objectForKey:@"PIC_DATA1"]];
    [body appendData:[[NSString stringWithFormat:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    
    //写入INFO的内容
    [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n",@"PIC_INFO"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:jsonData];
    [body appendData:[@"\r\n" dataUsingEncoding:NSUTF8StringEncoding]];

     //写入尾部内容
    [body appendData:[[NSString stringWithFormat:@"--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

    [request setHTTPBody:body];
    
    NSHTTPURLResponse *urlResponese = nil;
    NSError *error = [[NSError alloc]init];
    NSData* resultData = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponese error:&error];
    
    NSDictionary *responseDic = [NSJSONSerialization JSONObjectWithData:resultData options:NSJSONReadingMutableLeaves error:nil];