📄 showtemperatureservlet.java
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/*
* ShowTemperatureServlet.java
*
* Created on 2007年10月16日, 下午9:05
*/
package com.servlet;
import java.io.*;
import java.net.*;
import javax.servlet.*;
import javax.servlet.http.*;
/**
*
* @author hyl
* @version
*/
public class ShowTemperatureServlet extends HttpServlet {
/** Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
* @param request servlet request
* @param response servlet response
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=gb2312");
PrintWriter out = response.getWriter();
String Temperature=(String)getServletContext().getAttribute("Temperature");
if(Temperature==null){Temperature=new String("0");
}
String oldTemperature=(String)request.getSession().getAttribute("OldTemperature");
out.println("<HTML><HEAD><TITLE>气温信息显示 "
+ "</TITLE></HEAD>");
out.println("<BODY>");
out.println("当前最新气温："+Temperature+"摄氏度");
if(oldTemperature!=null){
out.println("<BR>");
out.println("更新前气温："+oldTemperature+"摄氏度");
}
out.println("</BODY></HTML>");
//更新会话中的气温信息
request.getSession().setAttribute("OldTemperature",Temperature);
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/** Handles the HTTP <code>GET</code> method.
* @param request servlet request
* @param response servlet response
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/** Handles the HTTP <code>POST</code> method.
* @param request servlet request
* @param response servlet response
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/** Returns a short description of the servlet.
*/
public String getServletInfo() {
return "Short description";
}
// </editor-fold>
}
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