Servlet的request獲取請求頭數據

獲取請求頭數據
* 方法：
* String getHeader(String name):通過請求頭的名稱獲取請求頭的值
* Enumeration getHeaderNames():獲取所有的請求頭名稱

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("/requestDemo2")
public class RequestDemo2 extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //獲取請求體
        //獲取所有請求頭的名稱
        Enumeration<String> headerNames = request.getHeaderNames();
        while (headerNames.hasMoreElements()) {
            String s = headerNames.nextElement();
            //獲取請求頭名稱的值
            String header = request.getHeader(s);
            System.out.println(s+ " : " +header);
        }
    }
}