SpringBoot进阶教程(八十三)Kaptcha - ToB企服应用市场:ToB评测及商务社交产业平台

<dependency>
<groupId>com.github.penggle</groupId>
<artifactId>kaptcha</artifactId>
<version>2.3.2</version>
</dependency>

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/**
* @Author chen bo
* @Date 2023/12
* @Des
*/
@Configuration
public class KaptchaConfig {
@Bean
public DefaultKaptcha getDefaultKaptcha() {
com.google.code.kaptcha.impl.DefaultKaptcha defaultKaptcha = new com.google.code.kaptcha.impl.DefaultKaptcha();
Properties properties = new Properties();
properties.put("kaptcha.border", "no");
properties.put("kaptcha.textproducer.font.color", "black");
properties.put("kaptcha.image.width", "200");
properties.put("kaptcha.image.height", "50");
properties.put("kaptcha.textproducer.font.size", "25");
properties.put("kaptcha.session.key", "verifyCode");
properties.put("kaptcha.textproducer.char.space", "5");
Config config = new Config(properties);
defaultKaptcha.setConfig(config);
return defaultKaptcha;
}
}

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/**
* @Author chen bo
* @Date 2023/12
* @Des
*/
@RestController
@RequestMapping("/demo")
@Slf4j
public class ImageController {
@Autowired
private DefaultKaptcha defaultKaptcha;
@RequestMapping(path = "/kaptcha", method = RequestMethod.GET)
public void getKaptcha(HttpServletResponse response, HttpSession session) {
String text = defaultKaptcha.createText();
BufferedImage image = defaultKaptcha.createImage(text);
// 线上环境这个验证码肯定是要存redis里的，redis的key还需要设置一个合理的过期时间
session.setAttribute("kaptcha", text);
response.setContentType("image/png");
try {
ServletOutputStream os = response.getOutputStream();
ImageIO.write(image, "png", os);
} catch (IOException e) {
log.error("响应验证码失败:" + e.getMessage());
}
}
@CrossOrigin
@RequestMapping(path = "/login", method = RequestMethod.POST)
public String login(HttpSession session, String kaptcha) {
if(kaptcha.equals(session.getAttribute("kaptcha"))){
return kaptcha + "验证码正确";
}else{
return kaptcha + "验证码错误";
}
}
}

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<h3>请登录</h3>
<input type="text" placeholder="请输入用户名" name="username" required="required"/>
<br/>
<input type="password" placeholder="请输入密码" name="password" required="required"/>
<br/>
<span style="display: inline">
<input type="text" name="请输入验证码" id="kaptcha_value" placeholder="验证码" required="required"/>
<img src="http://localhost:8301/demo/kaptcha" id="kaptcha" style="width:100px;height:50px;" class="mr-2"/>
<a target="_blank" href="https://www.cnblogs.com/javascript:refresh_kaptcha();" class="font-size-12 align-bottom">刷新验证码</a>
</span>
<br/>
<button type="submit" onclick="login()">登录</button>
</body>
</html>

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/**
* @Author chen bo
* @Date 2023/12
* @Des
*/
public class CustomTextCreator extends DefaultTextCreator {
private static final String[] Number = "0,1,2,3,4,5,6,7,8,9,10".split(",");
@Override
public String getText()
{
int result;
Random random = new Random();
int x = random.nextInt(10);
int y = random.nextInt(10);
StringBuilder suChinese = new StringBuilder();
int randomOperand = (int) Math.round(Math.random() * 2);
if (randomOperand == 0) {
result = x * y;
suChinese.append(Number[x]);
suChinese.append("*");
suChinese.append(Number[y]);
} else if (randomOperand == 1) {
if (!(x == 0) && y % x == 0) {
result = y / x;
suChinese.append(Number[y]);
suChinese.append("/");
suChinese.append(Number[x]);
} else {
result = x + y;
suChinese.append(Number[x]);
suChinese.append("+");
suChinese.append(Number[y]);
}
} else if (randomOperand == 2) {
if (x >= y) {
result = x - y;
suChinese.append(Number[x]);
suChinese.append("-");
suChinese.append(Number[y]);
} else {
result = y - x;
suChinese.append(Number[y]);
suChinese.append("-");
suChinese.append(Number[x]);
}
} else {
result = x + y;
suChinese.append(Number[x]);
suChinese.append("+");
suChinese.append(Number[y]);
}
suChinese.append("=?@").append(result);
return suChinese.toString();
}
}

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/**
* @Author chen bo
* @Date 2023/12
* @Des
*/
@Configuration
public class KaptchaConfig {
// @Bean
// public DefaultKaptcha getDefaultKaptcha() {
// com.google.code.kaptcha.impl.DefaultKaptcha defaultKaptcha = new com.google.code.kaptcha.impl.DefaultKaptcha();
// Properties properties = new Properties();
// properties.put("kaptcha.border", "no");
// properties.put("kaptcha.textproducer.font.color", "black");
// properties.put("kaptcha.image.width", "200");
// properties.put("kaptcha.image.height", "50");
// properties.put("kaptcha.textproducer.font.size", "25");
// properties.put("kaptcha.session.key", "verifyCode");
// properties.put("kaptcha.textproducer.char.space", "5");
// Config config = new Config(properties);
// defaultKaptcha.setConfig(config);
//
// return defaultKaptcha;
// }
@Bean(name = "captchaProducerMath")
public DefaultKaptcha getKaptchaBeanMath() {
DefaultKaptcha defaultKaptcha = new DefaultKaptcha();
Properties properties = new Properties();
// 是否有边框默认为true 我们可以自己设置yes，no
properties.setProperty("kaptcha.border", "yes");
// 边框颜色默认为Color.BLACK
properties.setProperty("kaptcha.border.color", "105,179,90");
// 验证码文本字符颜色默认为Color.BLACK
properties.setProperty("kaptcha.textproducer.font.color", "blue");
// 验证码图片宽度默认为200
properties.setProperty("kaptcha.image.width", "160");
// 验证码图片高度默认为50
properties.setProperty("kaptcha.image.height", "60");
// 验证码文本字符大小默认为40
properties.setProperty("kaptcha.textproducer.font.size", "35");
// KAPTCHA_SESSION_KEY
properties.setProperty("kaptcha.session.key", "kaptchaCodeMath");
// 验证码文本生成器
properties.setProperty("kaptcha.textproducer.impl", "com.kaptcha.demo.util.CustomTextCreator");
// 验证码文本字符间距默认为2
properties.setProperty("kaptcha.textproducer.char.space", "3");
// 验证码文本字符长度默认为5
properties.setProperty("kaptcha.textproducer.char.length", "6");
// 验证码文本字体样式默认为new Font("Arial", 1, fontSize), new Font("Courier", 1,
// fontSize)
properties.setProperty("kaptcha.textproducer.font.names", "Arial,Courier");
// 验证码噪点颜色默认为Color.BLACK
properties.setProperty("kaptcha.noise.color", "white");
// 干扰实现类
properties.setProperty("kaptcha.noise.impl", "com.google.code.kaptcha.impl.NoNoise");
// 图片样式水纹com.google.code.kaptcha.impl.WaterRipple
// 鱼眼com.google.code.kaptcha.impl.FishEyeGimpy
// 阴影com.google.code.kaptcha.impl.ShadowGimpy
properties.setProperty("kaptcha.obscurificator.impl", "com.google.code.kaptcha.impl.ShadowGimpy");
Config config = new Config(properties);
defaultKaptcha.setConfig(config);
return defaultKaptcha;
}
}

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/**
* @Author chen bo
* @Date 2023/12
* @Des
*/
@RestController
@Slf4j
@RequestMapping("/custom")
public class CustomController {
@Autowired
private Producer producer;
public static final String DEFAULT_CODE_KEY = "random_code_";
/**
* @MethodName createCaptcha
* @Description 生成验证码
* @param httpServletResponse 响应流
* @Author hl
* @Date 2022/12/6 10:30
*/
@GetMapping("/create")
public void createCaptcha(HttpServletResponse httpServletResponse, HttpSession session) throws IOException {
// 生成验证码
String capText = producer.createText();
String capStr = capText.substring(0, capText.lastIndexOf("@"));
String result = capText.substring(capText.lastIndexOf("@") + 1);
BufferedImage image = producer.createImage(capStr);
// 保存验证码信息
String randomStr = UUID.randomUUID().toString().replaceAll("-", "");
System.out.println("随机数为:" + randomStr);
//redisTemplate.opsForValue().set(DEFAULT_CODE_KEY + randomStr, result, 3600, TimeUnit.SECONDS);
session.setAttribute("kaptcha", result);
// 转换流信息写出
FastByteArrayOutputStream os = new FastByteArrayOutputStream();
try {
ImageIO.write(image, "jpg", os);
} catch (IOException e) {
log.error("ImageIO write err", e);
httpServletResponse.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
// 定义response输出类型为image/jpeg类型，使用response输出流输出图片的byte数组
byte[] bytes = os.toByteArray();
//设置响应头
httpServletResponse.setHeader("Cache-Control", "no-store");
//设置响应头
httpServletResponse.setHeader("randomstr",randomStr);
//设置响应头
httpServletResponse.setHeader("Pragma", "no-cache");
//在代理服务器端防止缓冲
httpServletResponse.setDateHeader("Expires", 0);
//设置响应内容类型
ServletOutputStream responseOutputStream = httpServletResponse.getOutputStream();
responseOutputStream.write(bytes);
responseOutputStream.flush();
responseOutputStream.close();
}
}

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