前情回顾

Myeclipse的安装教程_科大云炬的博客-CSDN博客

【JavaWeb第1次上机练习】安装Tomcat并在本地浏览器成功运行第一个Hello world网站_科大云炬的博客-CSDN博客

【第2次JavaWeb上机练习】_科大云炬的博客-CSDN博客

第3次 JavaWeb上机练习：Servlet基础作业_科大云炬的博客-CSDN博客

第4次JavaWeb上机练习——ServletConfig接口的常用方法_科大云炬的博客-CSDN博客

Javaweb第5次上机练习（获取HTTP的请求参数）_科大云炬的博客-CSDN博客

上机实操

1在src目录新建名为ServletCkde的servlet

功能：从前端form表单接收post请求中的参数，并传递给后端的jsp脚本提示欢迎信息

package com.zr;

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 ServletCkde extends HttpServlet {

	
	public ServletCkde() {
		super();
	}

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

		        //指定浏览器汉字的编码格式
				response.setContentType("text/html；charset=utf-8");
				//指定服务器的汉字编码格式
				request.setCharacterEncoding("utf-8");
				//1.获取表单中提交的名字
				String usernameString =request.getParameter("username");
				String passwordString =request.getParameter("password");
				//2.跳转到注册成功页面,并且把请求响应参数传递过去
				//3.通过request域把获取到的表单数据写入request域中,并通过getRequestDispatcher,
				//指定传递页面,通过forward传递参数出去
				request.setAttribute("name",usernameString);
				request.setAttribute("pwd",passwordString);
				request.getRequestDispatcher("/loginok.jsp").forward(request,response);
	}


	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

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

	}

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

}

2在WebRoot目录新建login.html

功能：前端交互页面，接收用户输入的用户名、密码信息

注：在from的action中填写ServletCkde的请求地址（包含项目名+路由地址）


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
	<head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head>
  	<body>
		<form action="/1109/servlet/ServletCkde" method="post">
			姓名：<input type="text"name="username"><br>
			密码：<input type="text"name="password"><br>
			<input type="submit"name="提交">
		</form>
	</body>
</html>

运行一下页面效果

3在WebRoot目录新建loginok.jsp

功能：从servlet的接收用户名和密码并提示欢迎信息，并在五秒后跳转到index.jsp首页

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  	<body>
		<%
		String strname=(String)request.getAttribute("name");
		String strpwd=(String)request.getAttribute("pwd");
		%>
		<p style="color:red">
		<%
		response.setHeader("refresh","2；ur1=/Webbk/index.jsp");
		%>
		欢迎你：<%=strname%>你已成功登录,请牢记您的密码<%=strpwd%>三秒后跳转到首页</p>
		秒后跳转到首页,如没有跳转你可以点击<ahref="index.jsp">首页〈/a>跳转到首页
	</body>
</html>

4在WebRoot目录新建index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
    这是首页 <br>
  </body>
</html>