// Reading HttpServletRequest Headers and Cookies example
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
/**
* This servlet exists to display all the parameters passed to it.
*/
public class RequestHeaders extends HttpServlet {
protected void doGet(
HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
// Set appropriate content type for response, and obtain
// the HTML output stream.
response.setContentType("text/html");
PrintWriter out = response.getWriter();
// Set up start of HTML page
out.write("<html>\n<head>\n<title>Display Request Headers</title>\n</head>\n<body>");
Enumeration headerNames = request.getHeaderNames();//getting all headers
out.write("<h2>Request Headers</h2>");
out.write("<table border=\"1\"><tr><th>Header Name</th><th>Header Values</th></tr>");
while (headerNames.hasMoreElements()) {
out.write("<tr>");
String headerName = (String) headerNames.nextElement();
out.write("<td>" + headerName + "</td>");
Enumeration headerValues = request.getHeaders(headerName);//passing header nameto get values
out.write("<td>");
while (headerValues.hasMoreElements()) {
String headerValue = (String) headerValues.nextElement();
out.write(headerValue + ";");
}
out.write("</td></tr>");
}
out.write("</table>");
// Obtain HttpSession so you are likely to have at least one cookie
HttpSession session = request.getSession();
out.write("<h2>Cookie Details</h2>");
Cookie[] cookies = request.getCookies();//getting all cookies
int length = (cookies == null) ? 0 : cookies.length;
for (int i = 0; i < length; i++) {
Cookie cookie = cookies[i];
out.write("<table border=\"1\"><tr><th>Cookie Attribute</th><th>Attribute Value</th></tr>");
out.write("<tr><td>Name</td><td>" + cookie.getName() + "</td></tr>" );
out.write("<tr><td>Value</td><td>" + cookie.getValue() + "</td></tr>" );
out.write("<tr><td>Domain</td><td>" + cookie.getDomain() + "</td></tr>" );
out.write("<tr><td>Path</td><td>" + cookie.getPath() + "</td></tr>" );
out.write("<tr><td>Comment</td><td>" + cookie.getComment() + "</td></tr>" );
out.write("<tr><td>MaxAge</td><td>" + cookie.getMaxAge() + "</td></tr>" );
out.write("<tr><td>Version</td><td>" + cookie.getVersion() + "</td></tr>" );
out.write("<tr><td>Secure</td><td>" + cookie.getSecure() + "</td></tr></table>" );
}
// Finish off the HTML page and close cleanly
out.write("\n</body>\n</html>");
out.close();
}
}
Output ;-
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
/**
* This servlet exists to display all the parameters passed to it.
*/
public class RequestHeaders extends HttpServlet {
protected void doGet(
HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
// Set appropriate content type for response, and obtain
// the HTML output stream.
response.setContentType("text/html");
PrintWriter out = response.getWriter();
// Set up start of HTML page
out.write("<html>\n<head>\n<title>Display Request Headers</title>\n</head>\n<body>");
Enumeration headerNames = request.getHeaderNames();//getting all headers
out.write("<h2>Request Headers</h2>");
out.write("<table border=\"1\"><tr><th>Header Name</th><th>Header Values</th></tr>");
while (headerNames.hasMoreElements()) {
out.write("<tr>");
String headerName = (String) headerNames.nextElement();
out.write("<td>" + headerName + "</td>");
Enumeration headerValues = request.getHeaders(headerName);//passing header nameto get values
out.write("<td>");
while (headerValues.hasMoreElements()) {
String headerValue = (String) headerValues.nextElement();
out.write(headerValue + ";");
}
out.write("</td></tr>");
}
out.write("</table>");
// Obtain HttpSession so you are likely to have at least one cookie
HttpSession session = request.getSession();
out.write("<h2>Cookie Details</h2>");
Cookie[] cookies = request.getCookies();//getting all cookies
int length = (cookies == null) ? 0 : cookies.length;
for (int i = 0; i < length; i++) {
Cookie cookie = cookies[i];
out.write("<table border=\"1\"><tr><th>Cookie Attribute</th><th>Attribute Value</th></tr>");
out.write("<tr><td>Name</td><td>" + cookie.getName() + "</td></tr>" );
out.write("<tr><td>Value</td><td>" + cookie.getValue() + "</td></tr>" );
out.write("<tr><td>Domain</td><td>" + cookie.getDomain() + "</td></tr>" );
out.write("<tr><td>Path</td><td>" + cookie.getPath() + "</td></tr>" );
out.write("<tr><td>Comment</td><td>" + cookie.getComment() + "</td></tr>" );
out.write("<tr><td>MaxAge</td><td>" + cookie.getMaxAge() + "</td></tr>" );
out.write("<tr><td>Version</td><td>" + cookie.getVersion() + "</td></tr>" );
out.write("<tr><td>Secure</td><td>" + cookie.getSecure() + "</td></tr></table>" );
}
// Finish off the HTML page and close cleanly
out.write("\n</body>\n</html>");
out.close();
}
}
Output ;-
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