How to do Java code to read application X www form Urlencoded?

You can use the Java Servlet API to read application/x-www-form-urlencoded data from an HTTP request. The following example demonstrates how you can use the getParameter method of the HttpServletRequest interface to retrieve the values of form fields:

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1import java.io.IOException;
2import javax.servlet.ServletException;
3import javax.servlet.http.HttpServlet;
4import javax.servlet.http.HttpServletRequest;
5import javax.servlet.http.HttpServletResponse;
6
7public class FormServlet extends HttpServlet {
8  protected void doPost(HttpServletRequest request, HttpServletResponse response)
9      throws ServletException, IOException {
10    String name = request.getParameter("name");
11    String email = request.getParameter("email");
12    String message = request.getParameter("message");
13    System.out.println("Name: " + name);
14    System.out.println("Email: " + email);
15    System.out.println("Message: " + message);
16  }
17}
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In this example, the doPost method is called when the form is submitted, and it retrieves the values of the name, email, and message fields using the getParameter method. Note that doPost should only be used when the form's method is set to "post". If the form's method is set to "get", you should use the doGet method instead.

Create a simple HTML form to test your code

Make sure to change action attribute and point it to your Java code.

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1<form action="http://example.com/form" method="post">
2  <label for="name">Name:</label>
3  <input type="text" id="name" name="name">
4
5  <label for="email">Email:</label>
6  <input type="email" id="email" name="email">
7
8  <label for="message">Message:</label>
9  <textarea id="message" name="message"></textarea>
10
11  <button type="submit">Submit</button>
12</form>
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