Java Web学习笔记

第一章 概述

客户端程序

胖客户端程序RCP
例如:腾讯QQ,迅雷,Excel

缺点:使用前必须安装,占用硬盘资源

瘦客户端程序TCP
例如:门户网站,CRM系统,网上银行
有点:免客户端

B/S与C/S结构

C/S结构缺点:必须安装和维护客户端软件才能使用
B/S结构:只要浏览器就可以.

HTTP与HTTPS

服务器:
Tomcat
Websphere
WebLogic

 

 

package com.hello.ch02.firstweb;

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 HelloServlet extends HttpServlet {

    /**
     * Constructor of the object.
     */
    public HelloServlet() {
        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 {
        response.setCharacterEncoding("UTF-8"); // 设置request,response编码方式
        request.setCharacterEncoding("UTF-8");
        
        response.setContentType("text/html"); // 设置文档类型
        PrintWriter out = response.getWriter(); // 获取out对象
        // 输出到客户端浏览器
        out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
        out.println("<HTML>");
        out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
        out.println("  <BODY>");
        
        String requestURI = request.getRequestURI();
        out.println("<form action='" + requestURI + "' method='post'>");
        out.println("请输入您的名字: <input type='text' name='name' />");
        out.println("<input type='submit' />");
        out.println("</form>");
        out.println("");
        
        String name = request.getParameter("name");
                                        //获取浏览器提交的name参数
        if(name != null && name.trim().length() > 0){
            out.println("您好, <b>" + name + "</b>. 欢迎来到Java Web世界.");
        }
        out.println("  </BODY>");
        out.println("</HTML>");
        out.flush();
        out.close();    // 关闭out
    }

    /**
     * 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 {

        this.doGet(request, response);
    }

    /**
     * Initialization of the servlet. <br>
     *
     * @throws ServletException if an error occurs
     */
    public void init() throws ServletException {
        // Put your code here
    }

}

 

posted @ 2016-12-18 00:19  xiaorong1115  阅读(133)  评论(0)  编辑  收藏  举报