jsp+ajax实现的局部刷新较验验证码(onblur事件触发较验)
程序员文章站
2023-01-25 14:54:21
本文实例讲述了jsp+ajax实现的局部刷新较验验证码(onblur事件触发较验)。分享给大家供大家参考,具体如下:
前台显示页面:
welcome.jsp...
本文实例讲述了jsp+ajax实现的局部刷新较验验证码(onblur事件触发较验)。分享给大家供大家参考,具体如下:
前台显示页面:
welcome.jsp
<%@ page language="java" contenttype="text/html; utf-8" pageencoding="utf-8"%> <!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"> <title>修改个人信息</title> <script> function createxmlhttprequest() { //表示当前浏览器不是ie,如ns,firefox if(window.xmlhttprequest) { xmlhttp = new xmlhttprequest(); } else if (window.activexobject) { xmlhttp = new activexobject("microsoft.xmlhttp"); } } function validate(field) { var div=document.getelementbyid("divbid"); // var reg=/[^a-za-z0-9_]{7,10}/g; if (field.value.length != 0) { //创建xmlhttprequest createxmlhttprequest(); var url = "codevalidate.jsp?authcode=" + field.value + "×tamp=" + new date().gettime();//加时间戳防止缓存重复 xmlhttp.open("get", url, true); //方法地址,处理完成后自动调用,回调 xmlhttp.onreadystatechange=function() { //匿名函数 if(xmlhttp.readystate == 4) { //ajax引擎初始化成功 if (xmlhttp.status == 200) { //http协议成功 document.getelementbyid("divbid").innerhtml =xmlhttp.responsetext; }else { alert("请求失败,错误码=" + xmlhttp.status); } } }; //将参数发送到ajax引擎 xmlhttp.send(null); }else { div.innerhtml="<div class=\"wrong\">验证码不能为空</div>" } } function reloadimage(imgurl){ var getimagecode=document.getelementbyid("codeimg"); getimagecode.src= imgurl + "?id=" + math.random(); var code=<%=session.getattribute("code")%>; alert(code) } </script> </head> <body> <form action="authcode.jsp" method="post" name="loginform"> 输入验证码:<input type="text" name="authcode" id="authcode" maxlength="4" size="10" onblur="validate(this)" ><span id="divbid"></span> <img id="codeimg" name="codeimg" border=0 src="authcode.jsp"> <a href="javascript:reloadimage('authcode.jsp')">看不清</a><br/> </form> <script language="javascript" type="text/javascript"> function reloadimage(imgurl){ var getimagecode=document.getelementbyid("codeimg"); getimagecode.src= imgurl + "?id=" + math.random(); var code=<%=session.getattribute("code")%>; alert(code) } </script> </body> </html>
产生图片页面
authcode.jsp
<%@ page contenttype="image/jpeg" import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*" pageencoding="gbk"%> <%!color getrandcolor(int fc, int bc) {//给定范围获得随机颜色 random random = new random(); if (fc > 255) fc = 255; if (bc > 255) bc = 255; int r = fc + random.nextint(bc - fc); int g = fc + random.nextint(bc - fc); int b = fc + random.nextint(bc - fc); return new color(r, g, b); }%> <% //设置页面不缓存 response.setheader("pragma", "no-cache"); response.setheader("cache-control", "no-cache"); response.setdateheader("expires", 0); // 在内存中创建图象 int width = 60, height = 20; bufferedimage image = new bufferedimage(width, height, bufferedimage.type_int_rgb); // 获取图形上下文 graphics g = image.getgraphics(); //生成随机类 random random = new random(); // 设定背景色 g.setcolor(getrandcolor(200, 250)); g.fillrect(0, 0, width, height); //设定字体 g.setfont(new font("times new roman", font.plain, 18)); //画边框 //g.setcolor(new color()); //g.drawrect(0,0,width-1,height-1); // 随机产生155条干扰线,使图象中的认证码不易被其它程序探测到 g.setcolor(getrandcolor(160, 200)); for (int i = 0; i < 100; i++) { int x = random.nextint(width); int y = random.nextint(height); int xl = random.nextint(12); int yl = random.nextint(12); g.drawline(x, y, x + xl, y + yl); } // 取随机产生的认证码(4位数字) string srand = ""; for (int i = 0; i < 4; i++) { string rand = string.valueof(random.nextint(10)); srand += rand; // 将认证码显示到图象中 g.setcolor(new color(20 + random.nextint(110), 20 + random .nextint(110), 20 + random.nextint(110)));//调用函数出来的颜色相同,可能是因为种子太接近,所以只能直接生成 g.drawstring(rand, 13 * i + 6, 16); system.out.println(rand); } // 将认证码存入session session.setattribute("code", srand); // 图象生效 g.dispose(); // 输出图象到页面 imageio.write(image, "jpeg", response.getoutputstream()); %>
ajax动态验证页面
codevalidate.jsp
<%@ page language="java" import="java.util.*,java.util.*,java.text.*,com.neusoft.xkxt.dao.*,com.neusoft.xkxt.bean.*,com.neusoft.xkxt.util.*" pageencoding="utf-8"%> <% string path = request.getcontextpath(); string basepath = request.getscheme()+"://"+request.getservername()+":"+request.getserverport()+path+"/"; %> <% string authcode=request.getparameter("authcode"); string code=(string)session.getattribute("code"); if(authcode.equals(code)){ out.println("<div class='right'>√</div>");} else{ out.println("<div class='wrong'>验证码不正确</div>");} %>
希望本文所述对大家jsp程序设计有所帮助。
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