How Do I Retrieve POST Request Payload in a Java Servlet?

Retrieving POST Request Payload in a Java Servlet

In Java servlets, obtaining the contents of the POST request payload can sometimes pose a challenge for developers. A common issue is trying to access the data in the Request Payload section of the headers tab in Chrome Developer Tools but encountering empty results.

Solution: Utilizing getReader() or getInputStream()

To successfully access the request payload data, utilize the following methods:

• getReader(): This method provides a BufferedReader object, allowing you to read the request body. This is suitable for text-based data.
• getInputStream(): Use this method when you need to process binary data. It returns a ServletInputStream object.

Example Code:

<code class="java">public class TestFilter implements Filter {

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        // Retrieve the request payload data
        BufferedReader reader = request.getReader();
        String payload = reader.readLine();

        // Process the payload data
        // ...

        // Pass control to the next filter or servlet
        chain.doFilter(request, response);
    }
}</code>

Important Note:

According to the Java Servlet API documentation, you can only use one of these two methods to read the body, not both. Therefore, choose the method that best suits the data type you're expecting in the request payload.

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