Java实现EasyCaptcha图形验证码的具体使用

<dependencies>
 <dependency>
 	<groupId>com.github.whvcse</groupId>
 	<artifactId>easy-captcha</artifactId>
 	<version>1.6.2</version>
 </dependency>
 </dependencies>

dependencies {
 compile 'com.github.whvcse:easy-captcha:1.6.2'
 }

@Controller
public class CaptchaController {
@RequestMapping("/captcha")  
public void captcha(HttpServletRequest request, HttpServletResponse response) throws Exception {  
    CaptchaUtil.out(request, response);  
}  
}

<img src="/captcha" width="130px" height="48px" />

<web-app>
 <!-- 图形验证码servlet -->
 <servlet>
 	<servlet-name>CaptchaServlet</servlet-name>
 	<servlet-class>com.wf.captcha.servlet.CaptchaServlet</servlet-class>
 </servlet>
 <servlet-mapping>
 	<servlet-name>CaptchaServlet</servlet-name>
 	<url-pattern>/captcha</url-pattern>
 </servlet-mapping>
 </web-app>

<img src="/captcha" width="130px" height="48px" />

@Controller  
public class LoginController {  
	@PostMapping("/login")  
	public JsonResult login(String username,String password,String verCode){  
    	if (!CaptchaUtil.ver(verCode, request)) {  
        	CaptchaUtil.clear(request);  // 清除session中的验证码  
        	return JsonResult.error("验证码不正确");  
    }  
}   

@Controller
public class CaptchaController {
    @RequestMapping("/captcha")  
    public void captcha(HttpServletRequest request, HttpServletResponse response) throws Exception {  
        // 设置位数  
        CaptchaUtil.out(5, request, response);  
        // 设置宽、高、位数  
        CaptchaUtil.out(130, 48, 5, request, response);  

        // 使用gif验证码  
        GifCaptcha gifCaptcha = new GifCaptcha(130,48,4);  
        CaptchaUtil.out(gifCaptcha, request, response);  
    }  
}