HttpServletRequest: getHeaderNames() : HttpServletRequest « javax.servlet.http « Java by API

1. Java by API
2. javax.servlet.http
3. HttpServletRequest

HttpServletRequest: getHeaderNames()

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class HeaderSnoop extends HttpServlet {

  public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException,
      IOException {
    res.setContentType("text/plain");
    PrintWriter out = res.getWriter();

    out.println("Request Headers:");
    Enumeration names = req.getHeaderNames();
    while (names.hasMoreElements()) {
      String name = (String) names.nextElement();
      Enumeration values = req.getHeaders(name); // support multiple values
      if (values != null) {
        while (values.hasMoreElements()) {
          String value = (String) values.nextElement();
          out.println(name + ": " + value);
        }
      }
    }
  }
}

           
       

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