JSP登录验证并显示信息

时间：2021-05-17 12:56:05

加入C标签：

加入jstl.jar 和standard.jar加入Lib文件夹中

将c.tld放入WEB-Info文件夹中

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>
  <style>
  #div
  {
  position:absolute;
  left:20%;
  top:10%;
  }
  </style>
    <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>
  <div id="div">
    <form action="Login" method="post">
    名字：<input type="text" name="uname" id="uname"/>
    <br>
   密码：<input type="password" name="upwd" id="upwd"/>
   <br>
   请选择自己喜欢的颜色:
   <br>
   <input type="radio" name="color" value="红色" />红色
   <input type="radio" name="color" value="绿色" checked  />绿色
   <input type="radio" name="color" value="绿色" />蓝色
   <br>
   选择喜欢的运动：
   <br>
   <input type="checkbox" name="checkbox" value="篮球"/>篮球
   <input type="checkbox" name="checkbox" value="足球"/>足球
   <input type="checkbox" name="checkbox" value="乒乓球"/>乒乓球
   <br>
   选择需要睡觉的时间：<select name="utime">
<option value="7小时">7小时</option> <option value="8小时">8小时</option> <option value="9小时">9小时</option>
</select>
<br>
个人简介：
<br>
<textarea name="ps" id="ps" rows="10" cols="30"></textarea>
<br>
<input type="submit" />
<input type="reset"/>
</form>
</div>
  </body>
</html>

welcome.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>  <!-- 加入JSTL标签-->
<%
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 'welcome.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>
   你的用户名是:   ${uname}  <!-- EL表达式 -->
  密码是: ${upwd}
  <br>
你喜欢的颜色是:${color} <br>
你喜欢的运动是：
<c:forEach items="${ch}" var="ch">   <!-- C标签 -->
${ch}
</c:forEach>
<br>
需要睡觉的时间
${utime}
<br>
个人简介
 ${ps}
  </body>
</html>

新建一个servlet包，建一个Login.java文件

package servlet;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class Login extends HttpServlet{
	public void doGet(HttpServletRequest request,HttpServletResponse response)
	{
	   response.setCharacterEncoding("UTF-8");
	   try {
		request.setCharacterEncoding("UTF-8");
	} catch (UnsupportedEncodingException e1) {
		// TODO Auto-generated catch block
		e1.printStackTrace();
	}
		String uname=request.getParameter("uname");//获取数据
		request.setAttribute("uname", uname);  //设值
		String upwd=request.getParameter("upwd");
		request.setAttribute("upwd", upwd);
		String color=request.getParameter("color");
		request.setAttribute("color", color);
		String ps=request.getParameter("ps");
		request.setAttribute("ps", ps);
		String utime=request.getParameter("utime");
		request.setAttribute("utime", utime);
		String checkbox[]=request.getParameterValues("checkbox");
		   request.setAttribute("ch", checkbox);
		if(uname.equals("admin")&&upwd.equals("123"))
		{
						try {
							request.getRequestDispatcher("welcome.jsp").forward(request, response);
						} catch (ServletException e) {
							// TODO Auto-generated catch block
							e.printStackTrace();
						} catch (IOException e) {
							// TODO Auto-generated catch block
							e.printStackTrace();
						}
		} else
			try {
				response.sendRedirect("index.jsp");
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
	}
	public void doPost(HttpServletRequest request,HttpServletResponse response)
	{
		this.doGet(request, response);
	}
	public void destory()
	{
		super.destroy();
	}

}

Web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0"
	xmlns="http://java.sun.com/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
	http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
	<servlet>
	<servlet-name>Login</servlet-name>
	<servlet-class>servlet.Login</servlet-class>
	</servlet>
	<servlet-mapping>
	<servlet-name>Login</servlet-name>
	<url-pattern>/Login</url-pattern>
	</servlet-mapping>
  <display-name></display-name>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

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