How to generate a download request from html page to controller of spring mvc
Question
<html> <head> <title>Student Registration</title> </head> <body> <h3 align="center">New Trainee Registration</h3> <table align="center" cellpadding="10"> <!-- First Name --> <tr> <td>First Name</td> <td>${traineeData.fName}</td> </tr> <!-- Last Name --> <tr> <td>Last Name</td> <td>${traineeData.lName}</td> </tr> <!-- Father's Name --> <tr> <td>Father's Name</td> <td>${traineeData.fatherName}</td> </tr> <!-- Mobile Number --> <tr> <td>Mobile No.</td> <td>${traineeData.mobile}</td> </tr> <tr> <td>Joining Date</td> <td>${traineeData.joiningDate}></td> </tr> <tr> <td>Grade</td> <td>${traineeData.grade}</td> </tr> <tr> <td>Gender</td> <td>${traineeData.gender}</td> </tr> <!-- Course --> <tr> <td>COURSES<br />APPLIED FOR </td> <td>${traineeData.course}</td> </tr> <tr> <td>Joining Date</td> <td>${traineeData.joiningDate}</td> </tr> <!-- Submit and Reset --> <tr> <td colspan="2" align="center"> <button type="button" >Generate Certificate</button> </td> </tr> </table> </body> </html>
Let's say, I have a download button on my HTML page. when clicking on this button a request goes through the controller of the spring MVC framework along with "enrollmentNo".
On Controller class, I will use this enrollmentNo.
I have a class which will generate a certificate for the student by fetching data using the student's enrollmentNo.
and response goes back and a file will download(which a pdf file generated by my pre-created class)
I have tried with many ways but not get what I want.
@RequestMapping(value = "/generateCertificate")
public void generateCertificate(@RequestParam("traineeData.enrollmentNo") int enrollmentNo) {
System.out.println("you in /generateCertificate");
// I don't know what should I return...
// please change return type accordingly...
}
I want a button on my HTML page named "Generate certificate". The code should be easy and normal, Ajax can be used here.
1 answers
solution1
1 ACCPTED 2019-05-30 17:57:06
Your button isn't actually doing anything, useful.
Try this code around your button...
<tr>
<td colspan="2" align="center">
<form action="/generateCertificate" method="GET">
<input type="hidden" name="enrollmentNo" value="${traineeData.enrollmentNo}"
<button type="submit">Generate Certificate</button>
</form>
</td>
</tr>
Then your controller will need to changed slightly...
@RequestMapping(value = "/generateCertificate")
public void generateCertificate(@RequestParam("enrollmentNo") int enrollmentNo) {
// The @RequestParam was changed to the name of the param from the form and not the object/value.
}
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