- 软件介绍
- 软件截图
itcast-tools-1.4.2.jar是实现jsp servlet验证码等功能必不可少的一款jar工具包,如果缺失了itcast-tools-1.4.2.jar包许多重要的功能将报错,马上下载此jar吧。
使用实例
①
servlet
servlet-nameVerifyCodeServlet/servlet-name
servlet-classcn.itcast.vcode.servlet.VerifyCodeServlet/servlet-class
/servlet
②
servlet-mapping
servlet-nameVerifyCodeServlet/servlet-name
url-pattern/VerifyCodeServlet/url-pattern
/servlet-mapping
③
利用itcast-tool包实现jsp+servlet验证码
④
需要的包名：itcast-tools.jar
⑤
新建LoginServlet.Java
package cn.itcast.test.web.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import cn.itcast.servlet.BaseServlet;
public class LoginServlet extends BaseServlet {
public String login(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
/*
* 校验验证码
* 1. 获取表单中的验证码
* 2. 获取图片上的文字
*/
String verifyCode = request.getParameter(verifyCode);
// VerifyCodeServlet会把真正的验证码保存到session中
String vcode = (String) request.getSession().getAttribute(vCode);
System.out.println(verifyCode.equalsIgnoreCase(vcode));
return null;
}
}
⑥
新建form.jsp
%@ page language=java import=java.util.* pageEncoding=UTF-8%
%@ taglib prefix=c uri=http://java.sun.com/jsp/jstl/core %
!DOCTYPE HTML PUBLIC -//W3C//DTD HTML 4.01 Transitional//EN
html
head
titleMy JSP form.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
--
script type=text/javascript
function _hyz() {
/*
1. 获取img元素
2. 给它的src指向为/tools/VerifyCodeServlet
*/
var img = document.getElementById(imgVerifyCode);
// 需要给出一个参数，这个参数每次都不同，这样才能干掉浏览器缓存！
img.src = /tools/VerifyCodeServlet?a= + new Date().getTime();
}
/script
/head
body
%--
1. 写表单，其中包含图片（验证码）
2. 让图片显示出来：
把img的src指向VerifyCodeServlet，你需要在web.xml中部署VerfiyCodeServlet
3. 换一张
--%
form action=/tools/LoginServlet method=post
%-- 添加一个参数：method=login --%
input type=hidden name=method value=login
用户名：input type=text name=name/br/
密 码：input type=password name=pwd/br/
验证码：input type=text name=verifyCode/br/
img src=/tools/VerifyCodeServlet id=imgVerifyCode/
a href=javascript:_hyz()换一张/a
br/
input type=submit value=提交/
/form
/body
/html
文件预览
itcast-tools-1.4.2.jar使用实例
①
<servlet>
<servlet-name>VerifyCodeServlet</servlet-name>
<servlet-class>cn.itcast.vcode.servlet.VerifyCodeServlet</servlet-class>
</servlet>
②
<servlet-mapping>
<servlet-name>VerifyCodeServlet</servlet-name>
<url-pattern>/VerifyCodeServlet</url-pattern>
</servlet-mapping>
③
利用itcast-tool包实现jsp+servlet验证码
④
需要的包名：itcast-tools.jar
⑤
新建LoginServlet.Java
package cn.itcast.test.web.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import cn.itcast.servlet.BaseServlet;
public class LoginServlet extends BaseServlet {
public String login(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
/*
* 校验验证码
* 1. 获取表单中的验证码
* 2. 获取图片上的文字
*/
String verifyCode = request.getParameter("verifyCode");
// VerifyCodeServlet会把真正的验证码保存到session中
String vcode = (String) request.getSession().getAttribute("vCode");
System.out.println(verifyCode.equalsIgnoreCase(vcode));
return null;
}
}
⑥
新建form.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'form.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">
-->
<script type="text/javascript">
function _hyz() {
/*
1. 获取<img>元素
2. 给它的src指向为/tools/VerifyCodeServlet
*/
var img = document.getElementById("imgVerifyCode");
// 需要给出一个参数，这个参数每次都不同，这样才能干掉浏览器缓存！
img.src = "/tools/VerifyCodeServlet?a=" + new Date().getTime();
}
</script>
</head>
<body>
<%--
1. 写表单，其中包含图片（验证码）
2. 让图片显示出来：
把<img>的src指向VerifyCodeServlet，你需要在web.xml中部署VerfiyCodeServlet
3. 换一张
--%>
<form action="/tools/LoginServlet" method="post">
<%-- 添加一个参数：method=login --%>
<input type="hidden" name="method" value="login">
用户名：<input type="text" name="name"/><br/>
密 码：<input type="password" name="pwd"/><br/>
验证码：<input type="text" name="verifyCode"/><br/>
<img src="/tools/VerifyCodeServlet" id="imgVerifyCode"/>
<a href="javascript:_hyz()">换一张</a>
<br/>
<input type="submit" value="提交"/>
</form>
</body>
</html>
itcast-tools-1.4.2.jar文件预览
