为了防止系统登录只使用账号与密码致使登录安全非常薄弱,所以在登录账号与密码的基础上增加验证码验证功能,增强了部分安全性。
下面为使用 kaptcha 来实现登录验证码的功能。
<!-- 验证码 jar kaptcha-->
<dependency>
<groupId>com.github.penggle</groupId>
<artifactId>kaptcha</artifactId>
<version>2.3.2</version>
</dependency>
<!-- 验证码 -->
<bean id="captchaProducer" class="com.google.code.kaptcha.impl.DefaultKaptcha">
<property name="config">
<bean class="com.google.code.kaptcha.util.Config">
<constructor-arg>
<props>
<!-- 是否有边框 可选yes 或者 no -->
<prop key="kaptcha.border">yes</prop>
<!-- 边框颜色 -->
<prop key="kaptcha.border.color">105,179,90</prop>
<!-- 验证码文本字符颜色 -->
<prop key="kaptcha.textproducer.font.color">blue</prop>
<!-- 验证码文本字符大小 -->
<prop key="kaptcha.textproducer.font.size">45</prop>
<!-- 验证码图片的宽度 默认200 -->
<prop key="kaptcha.image.width">125</prop>
<!-- 验证码图片的高度 默认50 -->
<prop key="kaptcha.image.height">45</prop>
<!-- 验证码文本字符长度 默认为5 -->
<prop key="kaptcha.textproducer.char.length">4</prop>
<!-- 验证码文本字体样式 默认为new Font("Arial", 1, fontSize), new Font("Courier", 1, fontSize) -->
<prop key="kaptcha.textproducer.font.names">宋体,楷体,微软雅黑</prop>
</props>
</constructor-arg>
</bean>
</property>
</bean>
package com.jtexplorer.controller.admin;
import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;
import java.io.IOException;
@Controller
public class VerifyImageCotroller {
@Autowired
private Producer captchaProducer = null;
/**
* 生成验证码
* @param request
* @param response
* @throws IOException
*/
@RequestMapping(value = "verifyImage")
public void getVerifyImage(HttpServletRequest request, HttpServletResponse response) throws IOException {
HttpSession session = request.getSession();
response.setDateHeader("Expires", 0);
response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
response.addHeader("Cache-Control", "post-check=0, pre-check=0");
response.setHeader("Pragma", "no-cache");
response.setContentType("image/jpeg");
//生成验证码文本
String capText = captchaProducer.createText();
//将文本放到session中
session.setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);
//利用生成的字符串构建图片
BufferedImage bi = captchaProducer.createImage(capText);
ServletOutputStream out = response.getOutputStream();
ImageIO.write(bi, "jpg", out);
try {
out.flush();
} finally {
out.close();
}
}
}
//判断是否生成验证码
if(session.getAttribute(Constants.KAPTCHA_SESSION_KEY) != null) {
//获取session中的验证码
String verifyCodeInSession = (String) session.getAttribute(Constants.KAPTCHA_SESSION_KEY);
//判断验证码是否正确
if(verifyCode.equals(verifyCodeInSession)){
// TODO: 2019/12/26 验证成功
}
}
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<table>
<tr><img name="randImage" id="randImage" src="" width="64" height="20" border="1" align="top">
</tr>
</table>
<script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.js"></script>
<script type="text/javascript">
//获取验证码
$(function() {
$("#randImage").attr("src","${prc }/verifyImage?"+Math.random());
});
//点击图片重置二维码
$("#randImage").click(function() {
$("#randImage").attr("src","${prc }/verifyImage?"+Math.random());
});
</script>
</body>
</html>
{{ cmt.username }}
{{ cmt.content }}
{{ cmt.commentDate | formatDate('YYYY.MM.DD hh:mm') }}