利用谷歌 kaptcha 进行验证码生成

 1 package main.com.smart.controller;
 2 
 3 import com.google.code.kaptcha.Producer;
 4 import main.com.smart.utils.CaptchaProducer;
 5 import main.com.smart.utils.RedisClient;
 6 import org.apache.log4j.Logger;
 7 import org.apache.log4j.spi.LoggerFactory;
 8 import org.springframework.beans.factory.annotation.Autowired;
 9 import org.springframework.stereotype.Controller;
10 import org.springframework.web.bind.annotation.RequestMapping;
11 import org.springframework.web.servlet.ModelAndView;
12 
13 import javax.imageio.ImageIO;
14 import javax.servlet.ServletOutputStream;
15 import javax.servlet.http.HttpServletRequest;
16 import javax.servlet.http.HttpServletResponse;
17 import javax.servlet.http.HttpSession;
18 
19 import com.google.code.kaptcha.Constants;
20 
21 import java.awt.image.BufferedImage;
22 
23 /**
24  * 验证码 生成控制器
25  *
26  * @author yang ming
27  * @create 2016-04-29 12:17
28  */
29 
30 
31 @Controller
32 @RequestMapping("/kaptcha")
33 public class CaptchaController {
34     /**
35      * 使用方法
36      * get: http://localhost:8080/smart/kaptcha
37      */
38     private static final Logger log = Logger.getLogger(CaptchaController.class);
39     @Autowired
40     private Producer captchaProducer = null;
41 
42     @RequestMapping
43     public ModelAndView getKaptchaImage(HttpServletRequest request, HttpServletResponse response) throws Exception {
44         RedisClient client = RedisClient.getInstance();
45         //在控制器中获取验证码
46         //String kaptchaExpected = (String) request.getSession().getAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY);
47         log.info("获取验证");
48 
49         log.info(Constants.KAPTCHA_SESSION_KEY);
50         HttpSession session = request.getSession();
51         String code1 = client.getValue(Constants.KAPTCHA_SESSION_KEY);
52         String code = String.valueOf(session.getAttribute(Constants.KAPTCHA_SESSION_KEY));
53         //System.out.println("******************验证码是: " + code + "******************");
54 
55         response.setDateHeader("Expires", 0);
56 
57         // Set standard HTTP/1.1 no-cache headers.
58         response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
59 
60         // Set IE extended HTTP/1.1 no-cache headers (use addHeader).
61         response.addHeader("Cache-Control", "post-check=0, pre-check=0");
62 
63         // Set standard HTTP/1.0 no-cache header.
64         response.setHeader("Pragma", "no-cache");
65 
66         // return a jpeg
67         response.setContentType("image/jpeg");
68 
69         // create the text for the image
70         String[] array = CaptchaProducer.getCaptchaText();
71         //String capText = captchaProducer.createText();
72         //int param1 = (int)capText.charAt(0);
73         //int param2 = (int)capText.charAt(1);
74         Integer result =  Integer.valueOf(array[0]) + Integer.valueOf(array[1]);
75 
76         // store the text in the session
77         client.setValue(Constants.KAPTCHA_SESSION_KEY, result.toString());
78         //session.setAttribute(Constants.KAPTCHA_SESSION_KEY, result);
79 
80         // create the image with the text
81         BufferedImage bi = captchaProducer.createImage(array[0]+"+"+array[1]+"=?");
82         ServletOutputStream out = response.getOutputStream();
83 
84         // write the data out
85         ImageIO.write(bi, "jpg", out);
86         try {
87             out.flush();
88         } finally {
89             out.close();
90         }
91         return null;
92     }
93 
94 }