Following is the code for Java Servlet.
package com.vitalflux.core;
import java.io.IOException;
import java.io.StringReader;
import java.util.List;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.csv.CSVFormat;
import org.apache.commons.csv.CSVRecord;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class FileIOController extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
if (ServletFileUpload.isMultipartContent(request)) {
try {
List multiparts = new ServletFileUpload(
new DiskFileItemFactory()).parseRequest(request);
for (FileItem item : multiparts) {
//
// If the item is a string content
//
if (!item.isFormField()) {
String content = item.getString();
StringReader sReader = new StringReader(content);
//
// Reads the file with headers as First Name and Last Name
//
Iterable records = CSVFormat.RFC4180
.withFirstRecordAsHeader().parse(sReader);
//
// Iterate over different rows
//
for (CSVRecord record : records) {
String lastName = record.get("Last Name");
String firstName = record.get("First Name");
System.out.println("First Name: " + firstName
+ ", Last Name: " + lastName);
}
}
}
// File uploaded successfully
request.setAttribute("message", "File Uploaded Successfully");
} catch (Exception ex) {
request.setAttribute("message", "File Upload Failed due to "
+ ex);
}
} else {
request.setAttribute("message",
"Sorry this Servlet only handles file upload request");
}
//
// Redirects the response to JSP page
//
RequestDispatcher dispatcher=getServletContext().getRequestDispatcher( "/WEB-INF/views/upload.jsp" );
dispatcher.forward(request, response);
}
}
Following is the code which one would want to define in web.xml. This defines configuration for above given servlet.
<servlet>
<servlet-name>fileIOController</servlet-name>
<servlet-class>com.vitalflux.core.FileIOController</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>fileIOController</servlet-name>
<url-pattern>/vitalflux/uploadfile</url-pattern>
</servlet-mapping>
Following is the UI code. Note down the enctype=”multipart/form-data” within Form tag.
<!DOCTYPE html>
<html>
<title>Upload File</title>
<head>
<!-- Mobile Specific Meta -->
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!--[if IE]><meta http-equiv='X-UA-Compatible' content='IE=edge,chrome=1'><![endif]-->
<!-- Bootstrap -->
<link href="/assets/css/bootstrap.css" rel="stylesheet">
</head>
<body class="container">
<h1>Upload the file</h1>
<hr/>
<div>
<form action="/vitalflux/uploadfile" method="post" enctype="multipart/form-data">
<div class="form-group">
<label for="file" class="control-label">File</label>
<input type="file" class="form-control" name="file" id="file" placeholder="Select a file" required>
</div>
<div class="modal-footer">
<button ng-if="showSubmit" class="btn btn-primary" type="submit">Submit</button>
</div>
</form>
</div>
<script src="/assets/js/jquery.min.js"></script>
<!-- Include all compiled plugins (below), or include individual files as needed -->
<script src="/assets/js/bootstrap.min.js"></script>
</body>
</html>
In recent years, artificial intelligence (AI) has evolved to include more sophisticated and capable agents,…
Adaptive learning helps in tailoring learning experiences to fit the unique needs of each student.…
With the increasing demand for more powerful machine learning (ML) systems that can handle diverse…
Anxiety is a common mental health condition that affects millions of people around the world.…
In machine learning, confounder features or variables can significantly affect the accuracy and validity of…
Last updated: 26 Sept, 2024 Credit card fraud detection is a major concern for credit…