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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

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">
";
          out.println(docType +
            "<html>
" +
            "<head><title>" + title + "</title></head>
"+
            "<body bgcolor="#f0f0f0">
" +
            "<h1 align="center">" + title + "</h1>
" +
            "<p>当前时间是：" + CT + "</p>
");
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
    }

}

代码

呵呵，乱码了，不好意思

查看全文

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原文地址：https://www.cnblogs.com/SamFlynn/p/4480197.html