The applet can send a GET/POST request to the servlet by opening a servlet URL with a query string. For example : 

// servlet URL 
URL url = new URL(getCodeBase(), \"/MyServlet?name=ABC\");

// open a connection to the servlet
URLConnection servletCon = url.openConnection();
servletCon.setDoInput(true); // true, if we get data back

// get the input stream from the servlet
InputStream in = servletCon.getInputStream();

// read the response from the servlet
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}