SpringMVC在上传文件的时候提示The current request i?400报错

参照这行 httpURLConnection.setRequestProperty("Content-Type",  

•           "multipart/form-data;boundary=" + boundary);  

设置消息头

1.  String uploadUrl = actionUrl;  
2.     String end = "\r\n";  
3.     String twoHyphens = "--";  
4.     String boundary = "******";  
5.     try  
6.     {  
7.       URL url = new URL(uploadUrl);  
8.       HttpURLConnection httpURLConnection = (HttpURLConnection) url  
9.           .openConnection();  
10.       httpURLConnection.setDoInput(true);  
11.       httpURLConnection.setDoOutput(true);  
12.       httpURLConnection.setUseCaches(false);  
13.       httpURLConnection.setRequestMethod("POST");  
14.       httpURLConnection.setRequestProperty("Connection", "Keep-Alive");  
15.       httpURLConnection.setRequestProperty("Charset", "UTF-8");  
16.       httpURLConnection.setRequestProperty("Content-Type",  
17.           "multipart/form-data;boundary=" + boundary);  
18.   
19.       DataOutputStream dos = new DataOutputStream(httpURLConnection.getOutputStream());  
20.       dos.writeBytes(twoHyphens + boundary + end);  
21.       dos.writeBytes("Content-Disposition: form-data; name=\"file\"; filename=\""  
22.               + srcPath.substring(srcPath.lastIndexOf("/") + 1)  
23.               + "\"" + end);  
24.       dos.writeBytes(end);  

form的enctype 设置一下

<form action="/api/v1.0/tests/testfile" httpMethod="post" enctype="multipart/form-data">
  <input type="file" name="testfile"/>
  <button type="submit">提交</button>
</form>

移动端通过httpclient发送文件，具体百度。

服务端

@RequestMapping("/insertOrder")

@ResponseBody

public  Object insertOrder(String userId,HttpServletRequest req) {

MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;             // 获得文件：         MultipartFile file = multipartRequest.getFileMap(); 

}