你如何处理服务器端的HttpUrlConnection？

Question

我试图通过HttpUrlConnection方法发送文件。

URL url = new URL(SERVER_URL); 
       connection = (HttpURLConnection) url.openConnection(); 
       connection.setDoInput(true);//Allow Inputs 
       connection.setDoOutput(true);//Allow Outputs 
       connection.setUseCaches(false);//Don't use a cached Copy 
       connection.setRequestMethod("POST"); 
       connection.setRequestProperty("Connection", "Keep-Alive"); 
       connection.setRequestProperty("ENCTYPE", "multipart/form-data"); 
       connection.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary); 
       connection.setRequestProperty("uploaded_file",selectedFilePath); 

用dataOutputStream发送文件。

dataOutputStream.writeBytes(lineEnd); 
       dataOutputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd); 

但不知道如何处理这HttlUrlConnection和FileOutputStream中的服务器端。

我不知道我做的是正确的，但试图获得输入流与 简单的RequestMapping。这是我的服务器端。

@RequestMapping(value="/fileUploadPage") 
    public String fileUpload(@Validated FileModel file, BindingResult result, ModelMap model,HttpServletRequest req) throws IOException { 

     How to handle 'httpUrlconnection outputstream' in here? 


} 

Answer 1

问题中的代码片断显示您正在使用spring。 Spring支持多部分文件上传，请检查documentation。在配置MultipartResolver后，您可以执行：

@PostMapping("/form") 
public String handleFormUpload(@RequestParam("name") String name, 
     @RequestParam("file") MultipartFile file) { 

    if (!file.isEmpty()) { 
     byte[] bytes = file.getBytes(); 
     // store the bytes somewhere 
     return "redirect:uploadSuccess"; 
    } 

    return "redirect:uploadFailure"; 
}