Upload File and maintain folder structure for specific category wise files in Liferay 6.2

Step 1-: Create a portlet - FileUpload-Portlet

Step 2-: Create init.jsp and add these line-:

<%@ taglib uri="http://java.sun.com/portlet_2_0" prefix="portlet"%>
<%@ taglib uri="http://liferay.com/tld/aui" prefix="aui"%>
<%@ taglib uri="http://liferay.com/tld/ui" prefix="liferay-ui"%>
<%@ page import="com.liferay.portal.kernel.util.ParamUtil"%>
<%@ page import="com.liferay.portal.kernel.util.Validator"%>
<%@ page import="javax.portlet.PortletPreferences"%>
<%@ page import="com.liferay.util.PwdGenerator"%>

Step 3-: On view.jsp add these lines

<%@ include file="/html/fileuploadprog/init.jsp" %>
<portlet:actionURL var="redirectUploadURL" name="redirectUpload"></portlet:actionURL>

<aui:form action="<%= redirectUploadURL %>">
  <aui:button name="UploadFile" value="UploadFile" onClick="<%= redirectUploadURL %>"/>
</aui:form>

Step 4-: Create a jsp page uploadFile.jsp and add these lines

<%@ include file="/html/fileuploadprog/init.jsp" %>


<portlet:actionURL var="editCaseURL" name="uploadCase"/>

<liferay-ui:success key="success" message=" File !!! uploaded successfully!" />
<liferay-ui:error key="error" message="Sorry, an error occur while uploading file. Please try again." />


<aui:form action="<%=editCaseURL%>" enctype="multipart/form-data" method="post">
 
        <aui:select name="folderStructure" id="folderStructure" onChange="console.log(this.value)">
             <aui:option value="store">Store</aui:option>
             <aui:option value="floor">Floor</aui:option>
             <aui:option value="dept">Department</aui:option>
       </aui:select>
<aui:input type="file" name="fileName" size="75" />
<aui:button type="submit" value="Upload"/>

</aui:form>

Step 5-: In the controller class add these lines

private static Log log = LogFactoryUtil.getLog(FileUploadProg.class);

//This is doView helps in rendering the page
public void doView(RenderRequest renderRequest,RenderResponse renderResponse)throws IOException,PortletException{

log.info("--Inside DoView----");

ThemeDisplay themeDisplay = (ThemeDisplay) renderRequest.getAttribute(WebKeys.THEME_DISPLAY);
PortletRequestDispatcher dispatcher = null;
PortletSession session = renderRequest.getPortletSession();

String portletTitle = renderRequest.getParameter("custom_portlet");
log.info("FileUploadPortlet.doView renderRequest.getParameter="+portletTitle);

if(portletTitle != null && portletTitle.equalsIgnoreCase("redirectUpload")){
dispatcher = getPortletContext().getRequestDispatcher("/html/fileuploadprog/uploadFile.jsp");
dispatcher.forward(renderRequest, renderResponse);
}else if(portletTitle != null && portletTitle.equalsIgnoreCase("success")){
dispatcher = getPortletContext().getRequestDispatcher("/html/fileuploadprog/view.jsp");
dispatcher.forward(renderRequest, renderResponse);
}
super.doView(renderRequest, renderResponse);
}

//Custom action class
       //This method gets executed once we click button on view.jsp page
public void redirectUpload(ActionRequest actionRequest,ActionResponse actionResponse){
actionResponse.setRenderParameter("custom_portlet", "redirectUpload");
}

//This method get executed when we click on upload on fileUpload.jsp
public void uploadCase(ActionRequest actionRequest,ActionResponse actionResponse) throws PortletException,IOException {

UploadPortletRequest uploadRequest = PortalUtil.getUploadPortletRequest(actionRequest);
//This gets value from init param written in portlet.xml
String someFolder = getInitParameter("uploadFolder");
String myNewFolder= uploadRequest.getParameter("folderStructure");
String folder = someFolder+myNewFolder;
try {      
       if (uploadRequest.getSize("fileName")==0) {
            SessionErrors.add(actionRequest, "error");
            }

       String sourceFileName = uploadRequest.getFileName("fileName");
       File file = uploadRequest.getFile("fileName");

       log.info("Name of file:" + uploadRequest.getFileName("fileName"));
       File newFolder = null;
       newFolder = new File(folder);
   if(!newFolder.exists()){
           newFolder.mkdir();
          }
       File newfile = null;
       newfile = new File(folder+"/"+sourceFileName+"-"+myNewFolder);
       log.info("New file name: " + newfile.getName());
       log.info("New file path: " + newfile.getPath());

       InputStream in = new BufferedInputStream(uploadRequest.getFileAsStream("fileName"));
       FileInputStream fis = new FileInputStream(file);
       FileOutputStream fos = new FileOutputStream(newfile);

       byte[] bytes_ = FileUtil.getBytes(in);
       int i = fis.read(bytes_);

       while (i != -1) {
        fos.write(bytes_, 0, i);
        i = fis.read(bytes_);
       }
       fis.close();
       fos.close();
       Float size = (float) newfile.length();
       log.info("file size bytes:" + size);
       log.info("file size Mb:" + size / 1048576);

       log.info("File created: " + newfile.getName());
       SessionMessages.add(actionRequest, "success");
                actionResponse.setRenderParameter("custom_portlet", "success");
} catch (FileNotFoundException e) {
log.info("File Not Found.");
e.printStackTrace();
SessionMessages.add(actionRequest, "error");
} catch (NullPointerException e) {
log.info("File Not Found");
e.printStackTrace();
SessionMessages.add(actionRequest, "error");
}catch (IOException e1) {
log.info("Error Reading The File.");
SessionMessages.add(actionRequest, "error");
e1.printStackTrace();
}

}


Step 6-: Open portlet.xml and update these line under init param tag

<init-param>
   <name>uploadFolder</name>
   <value>/home/FolderOne/FolderTwo/</value>
</init-param>