Creating a directory and donwnload the files from application

Create Directory Path under the Properties File: 

Under this file path keep some pdf or tif documents for reading and downloading.

Application.properties:

                                NEW_FILE_PATH = c:/Files

Add below code in your java file:

String filesPath = resourceBundle.getString("NEW_FILE_PATH");
StringBuilder stringBuilder = new StringBuilder();
         File dir = new File(filesPath);
         String[] filenames = null;
        if (dir != null && dir.listFiles()!= null) {
           
            filenames= dir.list();
                      
            for(int i=0;i<filenames.length;i++){
               
                fileList.add(filenames[i]);
            }
    }


Once Get the filenames from Directory We need to show the files in the frontEnd, So:
Add the Div to StringBuilder and construct the file to showing on UI.



 if(filenames != null && filenames.length > 0)
         {
        
                 stringBuilder.append("<div class=\"file_display\">")
                 .append("<div class=\"files\">");
                 for(int i=0;i<fileList.size();i++) { 
                         String fileName = "";
                         fileName = fileList.get(i);
                         System.out.println("fileName::"+fileName);
                         checkPDFFile(fileName,stringBuilder,auditLoanCaseID);
                }
                 stringBuilder.append("</div></div>");
         }
return stringBuilder.toString();


private void checkPDFFile(String fName, StringBuilder sb,String auditLoanCaseID)
    {
        if(fName.endsWith(".PDF") || fName.endsWith(".pdf")){
            log.info("Checking the File extension ::" + fName);
            sb.append(HREF);
            sb.append("#");
            sb.append("\" ");
            sb.append(" onClick=\"javascript:downloadLoanCaseDoc('"+fName+"','"+auditLoanCaseID+"' )\">");
            sb.append("<img src=\"images/PDF_doc.png\"><span>");
            sb.append(fName);
            sb.append(SPAN);
            log.info("final fName value :::"+fName);
            log.info("final fName value :::"+sb);
         }
        else{
           log.info("Checking the File extension in Other Files::" + fName);
                sb.append(HREF);
                sb.append("#");
                sb.append("\" ");
                sb.append(" onClick=\"javascript:downloadLoanCaseDoc('"+fName+"','"+auditLoanCaseID+"')\">");
                sb.append("<img src=\"images/images.png\"><span>");
                sb.append(fName);
                sb.append(SPAN);
         }
       
    }

Now Write Script method and call the action class for downloading the file.

function downloadLoanCaseDoc(docName, loanCaseId) {
    var url = "downloadLoancaseIdDocuments.action?docName="+docName;
    window.open(url,'edit','scrollbars=yes,width=415,height=365');
}

Action class :

public void downloadLoancaseIdDocuments(){
       
        HttpServletResponse  httpRes = ServletActionContext.getResponse();
        ResourceBundle resourceBundle = ResourceBundle.getBundle("resource.application");
        response.setContentType("application/octet-stream");
        response.setHeader("Cache-control","public");
        response.setHeader("Content-Disposition","inline; filename="+docName);
       
        ServletOutputStream serveltOutputStream = null;
        File file = null;
        FileInputStream fis = null;
        int length = 0;
        try {
           
            serveltOutputStream = httpRes.getOutputStream();

            String filesPath = resourceBundle.getString("NEW_FILE_PATH");
            file = new File(filesPath);

            fis = new FileInputStream(file);

            log.info("fis.available()" + fis.available());

            byte[] buff = new byte[Constants.BYTES];

            int read = 0;

            //read file contents

            while((read = fis.read(buff))!= -1){

            serveltOutputStream.write(buff,0, read);

            }

            serveltOutputStream.flush();
           
           
        } catch (Exception e) {
            // TODO: handle exception
        } finally {
            try {
                httpRes.flushBuffer();
                serveltOutputStream.close();
                log.info("downloadLoanCaseIdDocuments Ends....");
            } catch (Exception e2) {
                // TODO: handle exception
            }
           
        }
    }