9. HttpServletRequest - 기본 사용법

package hello.servlet.Basic.request;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Enumeration;

@WebServlet(name = "requestHeaderServlet", urlPatterns = "/request-header")
public class RequestHeaderServlet extends HttpServlet {

    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        String method = request.getMethod();
        String protocol = request.getProtocol();
        printStartLine(request);
        printHeaders(request);


    }

    private void printStartLine(HttpServletRequest request) {
        System.out.println("--- REQUEST-LINE - start ---");
        System.out.println("request.getMethod() = " + request.getMethod()); //GET
        System.out.println("request.getProtocal() = " + request.getProtocol()); //HTTP/1.1
        System.out.println("request.getScheme() = " + request.getScheme()); //http
        // http://localhost:8080/request-header
        System.out.println("request.getRequestURL() = " + request.getRequestURL());
        // /request-test
        System.out.println("request.getRequestURI() = " + request.getRequestURI());
        //username=hi
        System.out.println("request.getQueryString() = " +
                request.getQueryString());
        System.out.println("request.isSecure() = " + request.isSecure()); //https 사용 유무
        System.out.println("--- REQUEST-LINE - end ---");
        System.out.println();
    }

    private void printHeaders(HttpServletRequest request) {
        System.out.println("--- Headers - start ---");

       /* Enumeration<String> headerNames = request.getHeaderNames();
        while(headerNames.hasMoreElements()){
            String headerName = headerNames.nextElement();
            System.out.println(headerName + ": " + headerName);
        }*/

        request.getHeaderNames().asIterator()
                .forEachRemaining(headerName -> System.out.println("headerName = " + headerName));
    }
}

HttpServletRequest 기본 기능들을 사용해보았다.

 

START LINE정보, 헤더정보들을 확인할 수 있었다.