How to Access POST Request Payload in Java Servlet?

Accessing POST Request Payload in Java Servlet

When handling POST requests in a Java servlet, accessing the contents of the request payload can be crucial. Particularly when the payload contains data sent from a JavaScript library, retrieving this data becomes essential.

To effectively retrieve the request payload in a Java servlet's doPost method, the HttpServletRequest object provides two main methods:

1. getReader(): This method returns a BufferedReader object that allows the developer to read the text-based body of the request, including any data sent through the request payload.
2. getInputStream(): In cases where binary data is expected in the request, this method provides a ServletInputStream object.

While both methods can be used to read the request payload, it's important to note that either one can be called, but not both. Choosing the appropriate method depends on the type of data being received.

For example, in the provided code snippet:

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

To access the POST request payload, the servlet can use the getReader() or getInputStream() method:

<code class="java">BufferedReader reader = request.getReader();
String payload = reader.readLine();</code>

By utilizing these methods, Java servlets can effectively handle POST requests and retrieve the accompanying request payloads for further processing.

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