动手学servlet(三) 请求头和响应头信息

获取请求头信息

package servletdemo;

import java.io.IOException;

import java.util.Enumeration;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

 * Servlet implementation class HeaderSerlvet

 */

@WebServlet("/HeaderSerlvet")

public class HeaderSerlvet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    /**

     * @see HttpServlet#HttpServlet()

     */

    public HeaderSerlvet() {

        super();

        // TODO Auto-generated constructor stub

    }

    /**

     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

     */

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        // TODO Auto-generated method stub

        Enumeration<String> strEnum=request.getHeaderNames();

        while (strEnum.hasMoreElements()) {

            String str =strEnum.nextElement();

            String headervalue=request.getHeader(str);

            System.out.println(str+":"+headervalue);

        }

    }

    /**

     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

     */

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        // TODO Auto-generated method stub

    }

}

代码

动手学servlet(三) 请求头和响应头信息-LMLPHP

设置响应头信息

有很多设置响应头的方法，在这里举两个例子，setContentType和setIntHeader，其他的可以自己看API

package servletdemo;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Calendar;

import java.util.GregorianCalendar;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

 * Servlet implementation class ResponseHeaderServlet

 */

@WebServlet("/ResponseHeaderServlet")

public class ResponseHeaderServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    /**

     * @see HttpServlet#HttpServlet()

     */

    public ResponseHeaderServlet() {

        super();

        // TODO Auto-generated constructor stub

    }

    /**

     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

     */

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        // TODO Auto-generated method stub

         // 设置刷新自动加载时间为 5 秒

          response.setIntHeader("Refresh", 1);

          // 设置响应内容类型

          response.setContentType("text/html");

          // Get current time

          Calendar calendar = new GregorianCalendar();

          String am_pm;

          int hour = calendar.get(Calendar.HOUR);

          int minute = calendar.get(Calendar.MINUTE);

          int second = calendar.get(Calendar.SECOND);

          if(calendar.get(Calendar.AM_PM) == 0)

            am_pm = "AM";

          else

            am_pm = "PM";

          String CT = hour+":"+ minute +":"+ second +" "+ am_pm;

          PrintWriter out = response.getWriter();

          String title = "自动刷新 Header 设置";

          String docType =

          "<!doctype html public \"-//w3c//dtd html 4.0 " +

          "transitional//en\">\n";

          out.println(docType +

            "<html>\n" +

            "<head><title>" + title + "</title></head>\n"+

            "<body bgcolor=\"#f0f0f0\">\n" +

            "<h1 align=\"center\">" + title + "</h1>\n" +

            "<p>当前时间是：" + CT + "</p>\n");

    }

    /**

     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

     */

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        // TODO Auto-generated method stub

    }

}

代码

动手学servlet(三) 请求头和响应头信息-LMLPHP

呵呵，乱码了，不好意思