Priyanka Shaju Priyanka Shaju - 1 month ago 7
Java Question

how to get getServletContext() in spring mvc Controller

I need to upload images in my project. how to get the upload path in spring mvc.
The path is

/home/cme/project/eclipse/workspace_12_11/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/fileUploadTester/upload


Error:


"The method getServletContext() is undefined for the type
HomePageController" appear when I use this code String uploadPath =
getServletContext().getRealPath("") + File.separator +
UPLOAD_DIRECTORY;


My code is

public ModelAndView UploadPhoto(@ModelAttribute User user,HttpServletRequest request, HttpServletResponse response) throws IOException
{
final String UPLOAD_DIRECTORY = "upload";
final int THRESHOLD_SIZE = 1024 * 1024 * 3; // 3MB
final int MAX_FILE_SIZE = 1024 * 1024 * 40; // 40MB
final int MAX_REQUEST_SIZE = 1024 * 1024 * 50; // 50MB

String value[]=new String[10];
int i = 0;

// checks if the request actually contains upload file
if (!ServletFileUpload.isMultipartContent(request)) {
PrintWriter writer = response.getWriter();
writer.println("Request does not contain upload data");
writer.flush();
return;//here is error This method must return a result of type ModelAndView
}

DiskFileItemFactory factory = new DiskFileItemFactory();
factory.setSizeThreshold(THRESHOLD_SIZE);
factory.setRepository(new File(System.getProperty("java.io.tmpdir")));

ServletFileUpload upload = new ServletFileUpload(factory);
upload.setFileSizeMax(MAX_FILE_SIZE);//here error The method setFileSizeMax(int) is undefined for the type ServletFileUpload
upload.setSizeMax(MAX_REQUEST_SIZE);
String uploadPath = getServletContext().getRealPath("")
+ File.separator + UPLOAD_DIRECTORY;// here error The method getServletContext() is undefined for the type Homepage Controller
// creates the directory if it does not exist
File uploadDir = new File(uploadPath);
if (!uploadDir.exists()) {
uploadDir.mkdir();
}

try {

List<FileItem> items = upload.parseRequest(request); // request is HttpServletRequest
for(FileItem item:items) {
if(item.isFormField()) { // text fields, etc...
String fieldName = item.getFieldName();
System.out.print("fieldname"+fieldName);
value[i]= item.getString();
System.out.print("from uploader"+value[i]);
i++;
} else
{

//String fileName=new File(item.getName()).getName(); Use this to use default file name

String name=value[0];
System.out.println("file uploader name"+name);

String filePath = uploadPath + File.separator + name;
System.out.println(filePath);
File storeFile = new File(filePath);

try {

item.write(storeFile);
} catch (Exception ex) {

}
}
}

System.out.println("uploaded successfully");

} catch (Exception ex) {
System.out.println("error not uploaded");
}



return new ModelAndView("ChangePhoto");
}


Three error


  1. This method must return a result of type ModelAndView

  2. The method setFileSizeMax(int) is undefined for the type ServletFileUpload

  3. The method getServletContext() is undefined for the type Homepage Controller


Answer

1)use below code to autowire ServletContext object in spring mvc

    @Autowired
    ServletContext context; 

and after that try to execute your code like

    String uploadPath = context.getRealPath("") + File.separator + UPLOAD_DIRECTORY;

2) you can get it in your controller like this

private ServletContext context;

public void setServletContext(ServletContext servletContext) {
     this.context = servletContext;
}

but for this your controller must implements ServletContextAware interface