Ajax发送验证码实例
JSP页面内容：<td align="right" ><font color="red">*</font>手机：</td><td size="20" style/><input class=button01 name="captchaBtn" type="button"value="获取验证码" onclick="getCaptcha()" /></td>JSP页面中的javascript代码：var xmlhttp; function operurl(){ if (window.XMLHttpRequest) { xmlhttp = new XMLHttpRequest(); } else { xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); }}function getCaptcha(){if(isNumber(document.forms(0).subMobile.value)){operurl(); xmlhttp.open("get","<%=request.getContextPath()%>/qualityOpinionCas.cas?functionCode=getCaptcha&subMobile="+document.forms(0).subMobile.value); xmlhttp.onreadystatechange= function (){ if(xmlhttp.readyState==4){if(xmlhttp.status==200){var res=xmlhttp.responseText;if(res!=""){ document.forms(0).rcaptcha.value=res; //按钮灰10秒 document.forms(0).captchaBtn.disabled=true; setTimeout("document.forms(0).captchaBtn.disabled=false;",10000); return;}} } }; xmlhttp.send();} }Action中代码：/** * 获取验证码 */private ActionForward getCaptcha(BActionContext context)throws BsiException {HttpServletRequest request = context.getRequest();HttpServletResponse response = context.getResponse();String subMobile = request.getParameter("subMobile");String captcha = get5Radom();//获取随机生成5位随机数String content = "";if (null != subMobile) {String message = "您好，欢迎使用Ajax技术，验证码为:"+ captcha + "。您有任何疑问，欢迎拨打热线进行咨询";try {CpfzUtil.SMSExceues(subMobile, message); //调用一个接口，用于发送短信content = captcha;} catch (Exception e) {e.printStackTrace();}}try {request.setCharacterEncoding("gbk");response.setContentType("text/xml;charset=gbk");} catch (UnsupportedEncodingException el) {el.printStackTrace();}PrintWriter out;try {out = response.getWriter();out.print(content);out.flush();out.close();} catch (IOException e) {e.printStackTrace();}return null;}// 随机生成5位随机数private String get5Radom() {String newString = null;// 得到0.0到1.0之间的数字,并扩大100000倍double doubleP = Math.random() * 100000;// 如果数据等于100000,则减少1if (doubleP >= 100000) { doubleP = 99999;}// 然后把这个数字转化为不包含小数点的整数int tempString = (int) Math.ceil(doubleP);// 转化为字符串newString = "" + tempString;// 把得到的数增加为固定长度,为5位while (newString.length() < 5) {newString = "0" + newString;}return newString;}