Automatically update certain attributes of an object with Spring MVC's auto-refresh feature

Currently, I have a table in JSP where I am populating all object attributes using Spring MVC. The backend is providing a list of DTO's which are then being added to the ModelView. In the JSP, we iterate through this DTO list and display it in the table. Now, there is a new requirement to implement an auto refresh that will update certain attributes of all objects every 5 seconds. However, these attributes should only be retrieved when the user manually triggers a refresh.

I am seeking suggestions for a better approach to achieve this functionality. Please share your ideas.

javascriptjavaajaxjspspring-mvc

Answer №1

One convenient feature of JSP is its ability to easily create web pages that automatically refresh at specified intervals.

An effortless way to achieve page refreshing is by using the `setIntHeader()` method of the response object, which has the following signature:

public void setIntHeader(String header, int headerValue)

By invoking this method, a header named "Refresh" is sent back to the browser along with an integer value representing the time interval in seconds.

In the example provided below, the page is refreshed every second to continuously display the updated time:

    <%@ page import="java.io.*,java.text.*,java.util.*"%>
<html>

<head>
<title>Auto Refresh Header Example</title>
</head>

<body>
<h2>Auto Refresh Header Example</h2>
<%
// Page will be auto-refreshed after 1 second
response.setIntHeader("Refresh", 1);

// Retrieve and print current time
DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
Calendar cal = Calendar.getInstance();
out.println(dateFormat.format(cal.getTime()));
%>
</body>
</html>

The crucial line responsible for the auto-refresh functionality is: 

<%  response.setIntHeader("Refresh", 1); %>

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