springboot整合kaptcha驗(yàn)證碼的示例代碼

    
    com.github.penggle
      kaptcha
      2.3.2
    

<?xml version="1.0" encoding="UTF-8"?>

  
  
    
      
        
          
          
            yes
            105,179,90
            blue
            100
            50
            27
            code
            4
            宋體,楷體,微軟雅黑
            0123456789ABCEFGHIJKLMNOPQRSTUVWXYZ
            com.google.code.kaptcha.impl.WaterRipple
            black
            com.google.code.kaptcha.impl.DefaultNoise
            185,56,213
            white
            3
          
        
      
    
  

@Controller
public class CodeController {
  @Autowired
  private Producer captchaProducer = null;
  @RequestMapping("/kaptcha")
  public void getKaptchaImage(HttpServletRequest request, HttpServletResponse response) throws Exception {
    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");
    //生成驗(yàn)證碼
    String capText = captchaProducer.createText();
    session.setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);
    //向客戶(hù)端寫(xiě)出
    BufferedImage bi = captchaProducer.createImage(capText);
    ServletOutputStream out = response.getOutputStream();
    ImageIO.write(bi, "jpg", out);
    try {
      out.flush();
    } finally {
      out.close();
    }
  }
}

public class CodeUtil {
  /**
   * 將獲取到的前端參數(shù)轉(zhuǎn)為string類(lèi)型
   * @param request
   * @param key
   * @return
   */
  public static String getString(HttpServletRequest request, String key) {
    try {
      String result = request.getParameter(key);
      if(result != null) {
        result = result.trim();
      }
      if("".equals(result)) {
        result = null;
      }
      return result;
    }catch(Exception e) {
      return null;
    }
  }
  /**
   * 驗(yàn)證碼校驗(yàn)
   * @param request
   * @return
   */
  public static boolean checkVerifyCode(HttpServletRequest request) {
    //獲取生成的驗(yàn)證碼
    String verifyCodeExpected = (String) request.getSession().getAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY);
    //獲取用戶(hù)輸入的驗(yàn)證碼
    String verifyCodeActual = CodeUtil.getString(request, "verifyCodeActual");
    if(verifyCodeActual == null ||!verifyCodeActual.equals(verifyCodeExpected)) {
      return false;
    }
    return true;
  }
}

@RestController
public class HelloWorld {
  @RequestMapping("/hello")
  public String hello(HttpServletRequest request) {
    if (!CodeUtil.checkVerifyCode(request)) {
      return "驗(yàn)證碼有誤！";
    } else {
      return "hello,world";
    }
  }
}

  
  
  



  驗(yàn)證碼: 
  

    
  
  

@Configuration
public class KaptchaConfig {
  @Bean
  public DefaultKaptcha getDefaultKaptcha(){
    DefaultKaptcha captchaProducer = new DefaultKaptcha();
    Properties properties = new Properties();
    properties.setProperty("kaptcha.border", "yes");
    properties.setProperty("kaptcha.border.color", "105,179,90");
    properties.setProperty("kaptcha.textproducer.font.color", "blue");
    properties.setProperty("kaptcha.image.width", "110");
    properties.setProperty("kaptcha.image.height", "40");
    properties.setProperty("kaptcha.textproducer.font.size", "30");
    properties.setProperty("kaptcha.session.key", "code");
    properties.setProperty("kaptcha.textproducer.char.length", "4");
    properties.setProperty("kaptcha.textproducer.font.names", "宋體,楷體,微軟雅黑");
    Config config = new Config(properties);
    captchaProducer.setConfig(config);
    return captchaProducer;

  }
}