How Do I Access POST Request Payload in Java Servlets?

Accessing POST Request Payload in Java Servlets

When receiving POST requests in Java servlets, it's common to encounter issues accessing the request payload's contents. The following guide addresses this challenge by exploring the various methods available.

Retrieving Payload Data

To access the request payload in the doPost method, consider the following techniques:

• Using getReader():

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

getReader() returns a BufferedReader that allows you to read the request body.

• Using getInputStream():

<code class="java">InputStream is = request.getInputStream();
byte[] payloadBytes = is.readAllBytes();</code>

getInputStream() returns a ServletInputStream that provides access to binary data.

Example Implementation

The following code snippet demonstrates how to retrieve the request payload using getReader():

<code class="java">@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    BufferedReader br = request.getReader();
    String payload = br.readLine();

    // Process the payload data...
}</code>

Note:

It's important to note that using both getReader() and getInputStream() to read the request body is not recommended. Once either method has been used, the other method should not be invoked.

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