JavaWeb

java.io.BufferedReader bis = new java.io.BufferedReader(
new java.io.InputStreamReader(request.getInputStream()));

String line = null;
StringBuilder sb = new StringBuilder();
try {
while ((line = bis.readLine()) != null) {
sb.append(line);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
bis.close();
}

<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
<meta http-equiv="Pragma" content="no-cache" />
<meta http-equiv="Expires" content="0" />
<%
response.setHeader( "Pragma", "no-cache" );
response.addHeader( "Cache-Control", "must-revalidate" );
response.addHeader( "Cache-Control", "no-cache" );
response.addHeader( "Cache-Control", "no-store" );
response.setDateHeader("Expires", 0);
%>