Getting Request Payload from Post Request in Java Servlet

Getting request payload from POST request in Java servlet

Simple answer:

Use getReader() to read the body of the request

More info:

There are two methods for reading the data in the body:

1. getReader() returns a BufferedReader that will allow you to read the body of the request.

2. getInputStream() returns a ServletInputStream if you need to read binary data.

Note from the docs: "[Either method] may be called to read the body, not both."

How to get HTTP form data from POST payload in Java HttpServlet?

it will behave where you write the code request.getParameter().
this thing always needs to write in the doGetPost() Method of the servlet like mentioned below. refer the following example.

public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException  {

     String id = req.getParameter("realname");
     String password = req.getParameter("mypassword");
}

public void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {

    String id = req.getParameter("realname");
    String password = req.getParameter("mypassword");
}

How is data from HTTP request body passed into a servlet

I found out the answer here at: https://stackoverflow.com/a/1773308/9867856. It turns out that as long as the method is marked with @POST, the method's String parameter will be automatically populated with data from the request body.

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