生成验证码插件kaptcha的使用（jsp中）
2017-03-24 15:41
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web。xml的配置
<!-- 生成验证码配置 -->
<servlet>
<servlet-name>Kaptcha</servlet-name>
<servlet-class>com.google.code.kaptcha.servlet.KaptchaServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Kaptcha</servlet-name>
<url-pattern>/kaptcha.jpg</url-pattern>
</servlet-mapping>
jsp页面
<%@ 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 'yanzhengma.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">
<script type="text/javascript" src="js/jquery-1.8.3.min.js"></script>
</head>
<body>
<form action="<%=path %>/users/yanzhengma.do">
<input type="text" name="kaptcha" value="" />
<img src="kaptcha.jpg" id="kaptchaImage"/>
<input type="submit" value="提交">
</form>
<script type="text/javascript">
$(function(){
$('#kaptchaImage').click(function () {
$(this).attr('src', '<%=basePath%>/kaptcha.jpg?' + Math.floor(Math.random()*100) );
})
});
</script>
<br /><small>Can't read the image? Click it to get a new one.</small>
</body>
</html>
后台控制器验证
@RequestMapping("/yanzhengma.do")
public String yanzhengma() {
String kaptchaExpected = (String) request.getSession().getAttribute(
"key");
String kaptchaReceived = request.getParameter("kaptcha");
System.out.println("kaptchaExpected=" + kaptchaExpected + " "
+ "kaptchaReceived=" + kaptchaReceived);
if (kaptchaReceived == null
|| !kaptchaReceived.equalsIgnoreCase(kaptchaExpected)) {
return "error";
}
return "ok";
}
验证码图片使用默认的样式
<!-- 生成验证码配置 -->
<servlet>
<servlet-name>Kaptcha</servlet-name>
<servlet-class>com.google.code.kaptcha.servlet.KaptchaServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Kaptcha</servlet-name>
<url-pattern>/kaptcha.jpg</url-pattern>
</servlet-mapping>
jsp页面
<%@ 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 'yanzhengma.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">
<script type="text/javascript" src="js/jquery-1.8.3.min.js"></script>
</head>
<body>
<form action="<%=path %>/users/yanzhengma.do">
<input type="text" name="kaptcha" value="" />
<img src="kaptcha.jpg" id="kaptchaImage"/>
<input type="submit" value="提交">
</form>
<script type="text/javascript">
$(function(){
$('#kaptchaImage').click(function () {
$(this).attr('src', '<%=basePath%>/kaptcha.jpg?' + Math.floor(Math.random()*100) );
})
});
</script>
<br /><small>Can't read the image? Click it to get a new one.</small>
</body>
</html>
后台控制器验证
@RequestMapping("/yanzhengma.do")
public String yanzhengma() {
String kaptchaExpected = (String) request.getSession().getAttribute(
"key");
String kaptchaReceived = request.getParameter("kaptcha");
System.out.println("kaptchaExpected=" + kaptchaExpected + " "
+ "kaptchaReceived=" + kaptchaReceived);
if (kaptchaReceived == null
|| !kaptchaReceived.equalsIgnoreCase(kaptchaExpected)) {
return "error";
}
return "ok";
}
验证码图片使用默认的样式
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