JSP登录验证并显示信息
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();
}
}
<?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>