//前端页面
<dl>
<dt><label class="title">验证码</label></dt>
<dd>
<input type="text" id="code" value="" maxlength="4" style="width: 172px;" placeholder="点击图片刷新">
<img src="/captcha?width=153&height=33&number=4" id="codeImage" style="float: left" onclick="this.src='/captcha?width=153&height=33&number=4'" />
<label class="msg"></label>
</dd>
</dl>
/**
* 验证码
*
* @param width 图片宽度
* @param height 图片高度
* @param number 验证码数量
*/
@RequestMapping(value = "/captcha")
public void captcha(HttpServletRequest request, HttpServletResponse response, int width, int height, int number) throws IOException {
ConfigurableCaptchaService cs = new ConfigurableCaptchaService();
cs.setColorFactory(new SingleColorFactory(new Color(25, 60, 170)));
cs.setFilterFactory(new CurvesRippleFilterFactory(cs.getColorFactory()));
RandomFontFactory ff = new RandomFontFactory();
ff.setMinSize(30);
ff.setMaxSize(30);
RandomWordFactory rwf = new RandomWordFactory();
rwf.setMinLength(number);
rwf.setMaxLength(number);
cs.setWordFactory(rwf);
cs.setFontFactory(ff);
cs.setHeight(height);
cs.setWidth(width);
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);
ServletOutputStream stream = response.getOutputStream();
String validate_code = EncoderHelper.getChallangeAndWriteImage(cs,
"png", stream);
request.getSession().setAttribute("REG_VAL_CODE", validate_code);
stream.flush();
stream.close();
}