将图像上传到tomcat服务器导致ios中出现错误400

Question

当我尝试将图像上传到服务器（tomcat）时，它显示错误400，如下所示   响应是Apache Tomcat / 7.0.22 - 错误报告

HTTP状态400 -

类型状态报告

消息

描述客户端发送的请求在语法上是不正确的（）。

Apache Tomcat / 7.0.22

如果我在图像空间中发送null我得到了正确的响应，BB中的代码工作正常可以任何人帮助我请过去两天坚持这个

iOS代码

NSURL *url = [NSURL   URLWithString:@"http://api.domain.com:8080/Saldos/api/saldos/subirFoto"];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
UIImage *image = [UIImage imageNamed:@"backGb.png"];
NSMutableData *bodyData = [[NSMutableData alloc] init];// backGb.jpg
NSData *imageData = UIImagePNGRepresentation(image);
[bodyData appendData:[[NSString stringWithFormat:@"pic"] dataUsingEncoding:NSUTF8StringEncoding]];
NSString *str = [[NSString alloc] initWithData:imageData encoding:NSASCIIStringEncoding];

[bodyData appendData:UIImageJPEGRepresentation(image, 9)];

[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"content-type"];
[request setValue:@"text/html,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/jpeg,*/*;q=0.5" forHTTPHeaderField:@"Accept"];
[request setValue:@"backGb.png" forHTTPHeaderField:@"pic"];
[request setHTTPMethod:@"POST"];
[request setHTTPBody:bodyData];
NSURLConnection *connection = [NSURLConnection connectionWithRequest:request delegate:self];

BB中的代码：

httpConnection = MakeUrl.returnUrl(url);
httpConnection.setRequestMethod(HttpConnection.POST);

 httpConnection.setRequestProperty("Content-Type",
  HttpProtocolConstants.CONTENT_TYPE_MULTIPART_FORM_DATA);
httpConnection.setRequestProperty("User-Agent","Mozilla/5.0 (X11; U; Linux "+ "i686; en-US; rv:1.8.1.6) Gecko/20061201 Firefox/2.0.0.6 (Ubuntu-feisty)");
 httpConnection.setRequestProperty("Accept","text/html,application/xml,"+ "application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/jpg,*/*;q=0.5");
 httpConnection.setRequestProperty("Content-Type","application/x-www-form-urlencoded");

  URLEncodedPostData _postData = new URLEncodedPostData("UTF-8",false);
 _postData.append("pic", postData);
OutputStream os = httpConnection.openOutputStream();
os.write(_postData.getBytes());
os.flush();