patchca整合Spring MVC生成超炫的验证码-优快云博客

本文介绍了一个自定义的验证码生成器实现细节，包括颜色、字符集、长度及干扰效果的设置。通过Spring MVC的@Controller注解提供HTTP接口，返回验证码图片，并将验证码文本保存在Session中以供后续验证。

  转载：
  http://lavasoft.blog.51cto.com/62575/1406947
 
  @Controller
 
  public 
  class 
  Login2Controller {
 
  private 
  static 
  ConfigurableCaptchaService cs = 
  new 
  ConfigurableCaptchaService();
 
  private 
  static 
  Random random = 
  new 
  Random();
 
  static 
  {
 
  //        cs.setColorFactory(new SingleColorFactory(new Color(25, 60, 170)));
 
  cs.setColorFactory(
  new 
  ColorFactory() {
 
  @Override
 
  public 
  Color getColor(
  int 
  x) {
 
  int
  [] c = 
  new 
  int
  [
  3
  ];
 
  int 
  i = random.nextInt(c.length);
 
  for 
  (
  int 
  fi = 
  0
  ; fi < c.length; fi++) {
 
  if 
  (fi == i) {
 
  c[fi] = random.nextInt(
  71
  );
 
  } 
  else 
  {
 
  c[fi] = random.nextInt(
  256
  );
 
  }
 
  }
 
  return 
  new 
  Color(c[
  0
  ], c[
  1
  ], c[
  2
  ]);
 
  }
 
  });
 
  RandomWordFactory wf = 
  new 
  RandomWordFactory();
 
  wf.setCharacters(
  "23456789abcdefghigkmnpqrstuvwxyzABCDEFGHIGKLMNPQRSTUVWXYZ"
  );
 
  wf.setMaxLength(
  4
  );
 
  wf.setMinLength(
  4
  );
 
  cs.setWordFactory(wf);
 
  }
 
  @RequestMapping
  (
  "/pcrimg"
  )
 
  public 
  void 
  crimg(HttpServletRequest request, HttpServletResponse response) 
  throws 
  IOException {
 
  switch 
  (random.nextInt(
  5
  )) {
 
  case 
  0
  :
 
  cs.setFilterFactory(
  new 
  CurvesRippleFilterFactory(cs.getColorFactory()));
 
  break
  ;
 
  case 
  1
  :
 
  cs.setFilterFactory(
  new 
  MarbleRippleFilterFactory());
 
  break
  ;
 
  case 
  2
  :
 
  cs.setFilterFactory(
  new 
  DoubleRippleFilterFactory());
 
  break
  ;
 
  case 
  3
  :
 
  cs.setFilterFactory(
  new 
  WobbleRippleFilterFactory());
 
  break
  ;
 
  case 
  4
  :
 
  cs.setFilterFactory(
  new 
  DiffuseRippleFilterFactory());
 
  break
  ;
 
  }
 
  HttpSession session = request.getSession(
  false
  );
 
  if 
  (session == 
  null
  ) {
 
  session = request.getSession();
 
  }
 
  setResponseHeaders(response);
 
  String token = EncoderHelper.getChallangeAndWriteImage(cs, 
  "png"
  , response.getOutputStream());
 
  session.setAttribute(
  "captchaToken"
  , token);
 
  System.out.println(
  "当前的SessionID=" 
  + session.getId() + 
  "，验证码=" 
  + token);
 
  }
 
  protected 
  void 
  setResponseHeaders(HttpServletResponse response) {
 
  response.setContentType(
  "image/png"
  );
 
  response.setHeader(
  "Cache-Control"
  , 
  "no-cache, no-store"
  );
 
  response.setHeader(
  "Pragma"
  , 
  "no-cache"
  );
 
  long 
  time = System.currentTimeMillis();
 
  response.setDateHeader(
  "Last-Modified"
  , time);
 
  response.setDateHeader(
  "Date"
  , time);
 
  response.setDateHeader(
  "Expires"
  , time);
 
  }
 
  }