import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.util.Random;
/**
* 验证码生成器
* @see --------------------------------------------------------------------------------------------------------------
* @see 可生成数字、大写、小写字母及三者混合类型的验证码
* @see 支持自定义验证码字符数量,支持自定义验证码图片的大小,支持自定义需排除的特殊字符,支持自定义干扰线的数量,支持自定义验证码图文颜色
* @see --------------------------------------------------------------------------------------------------------------
* @see 另外,给Shiro加入验证码有多种方式,也可以通过继承修改FormAuthenticationFilter类,通过Shiro去验证验证码
* @see 而这里既然使用了SpringMVC,也为了简化操作,就使用此工具生成验证码,并在Controller中处理验证码的校验
* @see --------------------------------------------------------------------------------------------------------------
* @create Sep 29, 2013 4:23:13 PM
* @author 玄玉<http://blog.youkuaiyun.com/jadyer>
*/
public class VerifyCodeUtil {
/**
* 验证码类型为仅数字,即0~9
*/
public static final int TYPE_NUM_ONLY = 0;
/**
* 验证码类型为仅字母,即大小写字母混合
*/
public static final int TYPE_LETTER_ONLY = 1;
/**
* 验证码类型为数字和大小写字母混合
*/
public static final int TYPE_ALL_MIXED = 2;
/**
* 验证码类型为数字和大写字母混合
*/
public static final int TYPE_NUM_UPPER = 3;
/**
* 验证码类型为数字和小写字母混合
*/
public static final int TYPE_NUM_LOWER = 4;
/**
* 验证码类型为仅大写字母
*/
public static final int TYPE_UPPER_ONLY = 5;
/**
* 验证码类型为仅小写字母
*/
public static final int TYPE_LOWER_ONLY = 6;
private VerifyCodeUtil(){}
/**
* 生成随机颜色
*/
private static Color generateRandomColor() {
Random random = new Random();
return new Color(random.nextInt(255), random.nextInt(255), random.nextInt(255));
}
/**
* 生成图片验证码
* @param type 验证码类型,参见本类的静态属性
* @param length 验证码字符长度,要求大于0的整数
* @param excludeString 需排除的特殊字符
* @param width 图片宽度(注意此宽度若过小,容易造成验证码文本显示不全,如4个字符的文本可使用85到90的宽度)
* @param height 图片高度
* @param interLine 图片中干扰线的条数
* @param randomLocation 每个字符的高低位置是否随机
* @param backColor 图片颜色,若为null则表示采用随机颜色
* @param foreColor 字体颜色,若为null则表示采用随机颜色
* @param lineColor 干扰线颜色,若为null则表示采用随机颜色
* @return 图片缓存对象
*/
public static BufferedImage generateImageCode(int type, int length, String excludeString, int width, int height, int interLine, boolean randomLocation, Color backColor, Color foreColor, Color lineColor){
String textCode = generateTextCode(type, length, excludeString);
return generateImageCode(textCode, width, height, interLine, randomLocation, backColor, foreColor, lineColor);
}
/**
* 生成验证码字符串
* @param type 验证码类型,参见本类的静态属性
* @param length 验证码长度,要求大于0的整数
* @param excludeString 需排除的特殊字符（无需排除则为null）
* @return 验证码字符串
*/
public static String generateTextCode(int type, int length, String excludeString){
if(length <= 0){
return "";
}
StringBuffer verifyCode = new StringBuffer();
int i = 0;
Random random = new Random();
switch(type){
case TYPE_NUM_ONLY:
while(i < length){
int t = random.nextInt(10);
//排除特殊字符
if(null==excludeString || excludeString.indexOf(t+"")<0) {
verifyCode.append(t);
i++;
}
}
break;
case TYPE_LETTER_ONLY:
while(i < length){
int t = random.nextInt(123);
if((t>=97 || (t>=65&&t<=90)) && (null==excludeString||excludeString.indexOf((char)t)<0)){
verifyCode.append((char)t);
i++;
}
}
break;
case TYPE_ALL_MIXED:
while(i < length){
int t = random.nextInt(123);
if((t>=97 || (t>=65&&t<=90) || (t>=48&&t<=57)) && (null==excludeString||excludeString.indexOf((char)t)<0)){
verifyCode.append((char)t);
i++;
}
}
break;
case TYPE_NUM_UPPER:
while(i < length){
int t = random.nextInt(91);
if((t>=65 || (t>=48&&t<=57)) && (null==excludeString || excludeString.indexOf((char)t)<0)){
verifyCode.append((char)t);
i++;
}
}
break;
case TYPE_NUM_LOWER:
while(i < length){
int t = random.nextInt(123);
if((t>=97 || (t>=48&&t<=57)) && (null==excludeString || excludeString.indexOf((char)t)<0)){
verifyCode.append((char)t);
i++;
}
}
break;
case TYPE_UPPER_ONLY:
while(i < length){
int t = random.nextInt(91);
if((t >= 65) && (null==excludeString||excludeString.indexOf((char)t)<0)){
verifyCode.append((char)t);
i++;
}
}
break;
case TYPE_LOWER_ONLY:
while(i < length){
int t = random.nextInt(123);
if((t>=97) && (null==excludeString||excludeString.indexOf((char)t)<0)){
verifyCode.append((char)t);
i++;
}
}
break;
}
return verifyCode.toString();
}
/**
* 已有验证码,生成验证码图片
* @param textCode 文本验证码
* @param width 图片宽度(注意此宽度若过小,容易造成验证码文本显示不全,如4个字符的文本可使用85到90的宽度)
* @param height 图片高度
* @param interLine 图片中干扰线的条数
* @param randomLocation 每个字符的高低位置是否随机
* @param backColor 图片颜色,若为null则表示采用随机颜色
* @param foreColor 字体颜色,若为null则表示采用随机颜色
* @param lineColor 干扰线颜色,若为null则表示采用随机颜色
* @return 图片缓存对象
*/
public static BufferedImage generateImageCode(String textCode, int width, int height, int interLine, boolean randomLocation, Color backColor, Color foreColor, Color lineColor){
//创建内存图像
BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
//获取图形上下文
Graphics graphics = bufferedImage.getGraphics();
//画背景图
graphics.setColor(null==backColor ? generateRandomColor() : backColor);
graphics.fillRect(0, 0, width, height);
//画干扰线
Random random = new Random();
if(interLine > 0){
int x = 0, y = 0, x1 = width, y1 = 0;
for(int i=0; i<interLine; i++){
graphics.setColor(null==lineColor ? generateRandomColor() : lineColor);
y = random.nextInt(height);
y1 = random.nextInt(height);
graphics.drawLine(x, y, x1, y1);
}
}
//字体大小为图片高度的80%
int fsize = (int)(height * 0.8);
int fx = height - fsize;
int fy = fsize;
//设定字体
graphics.setFont(new Font("Default", Font.PLAIN, fsize));
//写验证码字符
for(int i=0; i<textCode.length(); i++){
fy = randomLocation ? (int)((Math.random()*0.3+0.6)*height) : fy;
graphics.setColor(null==foreColor ? generateRandomColor() : foreColor);
//将验证码字符显示到图象中
graphics.drawString(textCode.charAt(i)+"", fx, fy);
fx += fsize * 0.9;
}
graphics.dispose();
return bufferedImage;
}
}
/**
* 小工具类
* @author Administrator
*
*/
@RestController
public class UtilController {
@Resource
private UtilDaoService utilDaoService;
Logger logging=Logger.getLogger(UtilController.class);
/**
* 获取验证码图片和文本(验证码文本会保存在HttpSession中)
*/
/**
* 验证码生成类
* @param request
* @param response
* @throws IOException
*/
@RequestMapping("getVerifyCodeImage")
public void getVerifyCodeImage(HttpServletRequest request, HttpServletResponse response) throws IOException {
//设置页面不缓存
response.setHeader("Pragma", "no-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
String verifyCode = VerifyCodeUtil.generateTextCode(VerifyCodeUtil.TYPE_NUM_ONLY, 4, null);
//将验证码放到HttpSession里面
request.getSession().setAttribute("verifyCode", verifyCode);
logging.info("本次生成的验证码为[" + verifyCode + "],已存放到HttpSession中");
//设置输出的内容的类型为JPEG图像
response.setContentType("image/jpeg");
BufferedImage bufferedImage = VerifyCodeUtil.generateImageCode(verifyCode, 90, 30, 3, true, Color.WHITE, Color.BLACK, null);
//写给浏览器
ImageIO.write(bufferedImage, "JPEG", response.getOutputStream());
}
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>首页</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
<meta name="format-detection" content="telephone=no">
<meta name="renderer" content="webkit">
<meta http-equiv="Cache-Control" content="no-siteapp" />
<link rel="stylesheet"
href="http://localhost:8089/easeshop/resource/assets/css/amazeui.app.css" />
<style>
</style>
</head>
<body style="
background-image: url('http://img1.3lian.com/img2011/w1/101/90/d/105.jpg');
">
<form class="am-form-inline" action="http://localhost:8089/easeshop/admin/login" method="post">
<div class="am-form-group" align="center" style="position: absolute;
margin-top:10%;
margin-right:25%;
width: 30%;
height:350px;
right:1%;
top: 50;
/* background-color:buttontext; */
borderborder: 1px solid gray;
">
<div align="center" ><font size="10" >用户登录</font></div>
<label><span><font size="3" color="red"></font></span></label>
<label><span><font size="3" color="red"></font></span></label>
<label><span><font size="3" color="red"></font></span></label>
<div>
<input type="text" class="am-form-field" minlength="11" id="username" name="username" placeholder="手机号码" required/><br/><br/>
<input type="password" class="am-form-field" minlength="6" id="password" name="password" placeholder="密码" required/><br/><br/>
<input type="yzm" class="am-form-field" minlength="4" id="password" name="yzm" placeholder="输入验证码" required/><br/><br/>
<img id="code" src="../getVerifyCodeImage?i=1" onclick="updateImg()" />
<a href="javascript:void(0)" onclick="updateImg()">刷新验证码</a><br/><br/>
<input type="checkbox" name="autologin" />下次自动登录
<button type="submit" data-am-loading="{loadingText: '努力加载中...'}" class="am-btn am-btn-primary am-btn-block">登录</button>
</div>
</div>
</div>
</form>
<!-- <a href="#sidebar" class="am-btn am-btn-sm am-btn-success am-icon-bars am-show-sm-only my-button" data-am-offcanvas><span class="am-sr-only">侧栏导航</span></a> -->
</div>
<!-- <iframe src="" name="renwu">sdfdsf</iframe> -->
<!-- <footer class="my-footer">
<p>sidebar template<br><small>© Copyright XXX. by the AmazeUI Team.</small></p>
</footer>
-->
<!--[if lt IE 9]>
<script src="http://libs.baidu.com/jquery/1.11.1/jquery.min.js"></script>
<script src="http://cdn.staticfile.org/modernizr/2.8.3/modernizr.js"></script>
<script src="assets/js/polyfill/rem.min.js"></script>
<script src="assets/js/polyfill/respond.min.js"></script>
<script src="assets/js/amazeui.legacy.js"></script>
<![endif]-->
<!--[if (gte IE 9)|!(IE)]><!-->
<script src="http://localhost:8089/easeshop/resource/assets/js/jquery.min.js"></script>
<script src="http://localhost:8089/easeshop/resource/assets/js/amazeui.min.js"></script>
<script src="http://localhost:8089/easeshop/resource/assets/js/app.js"></script>
<script type="text/javascript">
function updateImg(){
$("#code").attr("src",'../getVerifyCodeImage?i='+Math.random());
}
</script>
<!--<![endif]-->
</body>
</html>
本文介绍了一个验证码生成器的实现，支持多种类型验证码的生成，并可在SpringMVC环境下使用。
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