http通信及servlet介绍

package com.Cherie.server; import java.io.*; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class loadMessage extends HttpServlet { /** * Constructor of the object. */ public loadMessage() { super(); } /** * Destruction of the servlet. <br> */ public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } /** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } /** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to post. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); response.setCharacterEncoding("UTF-8"); request.setCharacterEncoding("UTF-8"); PrintWriter out = response.getWriter(); out.print("使用post方法访问服务器成功！"); System.out.println("访问成功"); String type = request.getParameter("type");//获取访问信息类型，0 授权信息，1 刷卡信息 if(type.equals("0")){ System.out.println("开始处理授权信息……"); String seatId = request.getParameter("seatId"); System.out.println(seatId); SignAuthAction saa = new SignAuthAction(); String jsonstr = saa.test(); out.print(jsonstr); }else if(type.equals("1")){ System.out.println("开始处理签入信息……"); /*BufferedReader br=new BufferedReader(new InputStreamReader(request.getInputStream(), "UTF-8")); System.out.println(br);*/ }else if(type.equals("2")){ System.out.println("开始处理签出信息……"); } out.flush(); out.close(); } /** * Initialization of the servlet. <br> * * @throws ServletException if an error occurs */ public void init() throws ServletException { // Put your code here } }