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验证码必须由后端来做 前端只是显示了一张图片而已并不知道图片上验证码的内容 就php来说 原理是利用php的随机函数申城一串验证码存储到session 然后利用gd2吧验证码做成一张图片显示在前端 用户在输入验证码的时候是吧涌入输入的值与session的值作对比来确定用户是否输入正确
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要用手机验证码功能，你需要向通讯服务商（移动、联通、电信）申请一个号码，用于给客户发送验证短信
下面是关键代码，如果剩下的你都搞不懂，我就无语了
JS
script type="text/javascript" language="javascript"
function reloadcodeOne(){//刷新验证码函数
var verify = document.getElementById('checkCodeImg');
verify.setAttribute('src', 'validateCode?dt=' + Math.random());
}
script type="text/javascript"
html
p
label验证码：/label
input class="code" value="请输入验证码" title="请输入验证码" name="rendCode" id="rendCode" onfocus="if (value =='请输入验证码'){value =''}" onblur="if (value ==''){value='请输入验证码'}" type="text" size="6" /
spanimg id="checkCodeImg" src="validateCodeServlet" onclick="javascript:reloadcodeOne();" alt="" width="75" height="24" //span
/p
java代码
package com.zhihui.action.common;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.struts2.ServletActionContext;
import com.zhihui.action.base.BaseAction;
/**
* p
* 校验码控制器
* /p
*
* @author liurong
* @version ValidateCodeServlet.java,v 0.1 2008-11-20 上午09:22:31 Administrator
* Exp
*/
public class ValidateCodeAction extends BaseAction {
private static final long serialVersionUID = 1L;
// 验证码图片的宽度。
private int width = 10;
// 验证码图片的高度。
private int height = 5;
// 验证码字符个数
private int codeCount = 5;
private int x = 0;
// 字体高度
private int fontHeight;
private int codeY;
/*char[] codeSequence = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J',
'K', 'L', 'M', 'N', 'P', 'R', 'S', 'T', 'U', 'V', 'W',
'X', 'Y', 'Z', '2', '3', '4', '5', '6', '7', '8', '9' };*/
char[] codeSequence = {'1', '2', '3', '4', '5', '6', '7', '8', '9', '0' };
HttpServletRequest req=ServletActionContext.getRequest();
HttpServletResponse resp=ServletActionContext.getResponse();
public String execute()
throws ServletException, java.io.IOException {
// 宽度
String strWidth = "70";
// 高度
String strHeight = "22";
// 字符个数
String strCodeCount = "5";
width = Integer.parseInt(strWidth);
height = Integer.parseInt(strHeight);
codeCount = Integer.parseInt(strCodeCount);
x = width / (codeCount);
fontHeight = height - 4;
codeY = height - 4;
// 定义图像buffer
BufferedImage buffImg = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics2D g = buffImg.createGraphics();
Random random = new Random();
// 将图像填充为白色
g.setColor(Color.WHITE);
g.fillRect(0, 0, width, height);
Font font = new Font("Fixedsys", Font.PLAIN, fontHeight);
g.setFont(font);
g.setColor(Color.BLACK);
g.drawRect(0, 0, width - 1, height - 1);
g.setColor(Color.BLACK);
for (int i = 0; i 15; i++) {
int x = random.nextInt(width);
int y = random.nextInt(height);
int xl = random.nextInt(8);
int yl = random.nextInt(8);
g.drawLine(x, y, x + xl, y + yl);
}
// randomCode用于保存随机产生的验证码，以便用户登录后进行验证。
StringBuffer randomCode = new StringBuffer();
int red = 0, green = 0, blue = 0;
for (int i = 0; i codeCount; i++) {
String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);
red = 0;//random.nextInt(255);
green = 0;//random.nextInt(255);
blue = 0;//random.nextInt(255);
g.setColor(new Color(red, green, blue));
g.drawString(strRand, (i ) * x, codeY);
randomCode.append(strRand);
}
HttpSession session = req.getSession();
session.setAttribute("validateCode", randomCode.toString());
resp.setHeader("Pragma", "no-cache");
resp.setHeader("Cache-Control", "no-cache");
resp.setDateHeader("Expires", 0);
resp.setContentType("image/jpeg");
ServletOutputStream sos = resp.getOutputStream();
ImageIO.write(buffImg, "jpeg", sos);
sos.close();
return null;
}
public int getWidth() {
return width;
}
public void setWidth(int width) {
this.width = width;
}
public int getHeight() {
return height;
}
public void setHeight(int height) {
this.height = height;
}
public int getCodeCount() {
return codeCount;
}
public void setCodeCount(int codeCount) {
this.codeCount = codeCount;
}
public int getX() {
return x;
}
public void setX(int x) {
this.x = x;
}
public int getFontHeight() {
return fontHeight;
}
public void setFontHeight(int fontHeight) {
this.fontHeight = fontHeight;
}
public int getCodeY() {
return codeY;
}
public void setCodeY(int codeY) {
this.codeY = codeY;
}
public char[] getCodeSequence() {
return codeSequence;
}
public void setCodeSequence(char[] codeSequence) {
this.codeSequence = codeSequence;
}
public HttpServletRequest getReq() {
return req;
}
public void setReq(HttpServletRequest req) {
this.req = req;
}
public HttpServletResponse getResp() {
return resp;
}
public void setResp(HttpServletResponse resp) {
this.resp = resp;
}
}
你好，可以使用canvas编写出验证码效果，你可以参考
!DOCTYPE HTML
html lang="en"
meta charset="utf-8"
script type="text/javascript" src="js/jquery-1.8.3.min.js"/script
style
@charset "utf-8";
/* CSS Document */
body {
background: url(images/img10.jpg) no-repeat fixed;
}
body,form,ul,ol,li,p,h1,h2,h3,h4,h5,h6,dl,dt,dd,table,fieldset,hr,div {
margin: 0;
padding: 0;
}
body,input,select,textarea {
color: #000;
font: 12px/1.8 "微软雅黑", Arial, Helvetica, sans-serif;
}
img {
border: 0;
vertical-align: middle;
}
table {
width: 100%;
border: 0;
border-collapse: collapse;
border-spacing: 0;
}
ul,ol,li {
list-style-type: none;
}
a {
color: #000;
outline: none;
text-decoration: none;
}
a:hover {
text-decoration: underline;
}
.contain {
width: 500px;
margin: 0 auto;
padding-top: 200px;
}
/style
body
div class="contain"
canvas id="myCanvas" height="300px" width="500px"your browser does not support the canvas tag /canvas
br / input type="text"
button onClick="pass()"提交/button
/div
/body
script type="text/javascript"
var canvas = $("#myCanvas").get(0);
var _canvas = $("#myCanvas").get(0).getContext("2d");
var return_str = "";
var _ifstart = false;
var _B_x = 0;
var _B_y = 0;
function can_click() {
};
function pass() {
var _val = $(":text:eq(0)").val();
if (_val == return_str) {
alert('您通过验证了！');
} else {
alert('您输入的验证码不正确！');
}
;
}
function start() {
try {
function drawscreen() {
_canvas.fillStyle = "#ffffaa";
_canvas.fillRect(0, 0, 500, 300);
_canvas.strokeStyle = "#000";
_canvas.strokeRect(5, 5, 490, 290);
}
;
function write_text(_str) {
_canvas.fillStyle = "#000000";
_canvas.font = "20px _sans";
_canvas.textBaseline = "top";
_canvas.fillText(_str, 195, 80);
}
;
function getabc() {
var _str = "a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,0,1,2,3,4,5,6,7,8,9";
var _str_array = _str.split(",");
return_str = "";
for (i = 0; i 4; i++) {
var _rnd = Math.floor(Math.random() * _str_array.length);
return_str += _str_array[_rnd];
}
;
}
;
drawscreen();
getabc();
write_text(return_str);
} catch (e) {
alert(e);
}
};
$(document).ready(function(e) {
start();
});
/script
/html
希望可以帮助到你
在html中的文本框中加入验证码，可以通过以下代码实现：
验证码通过GD生成PNG图片，并把$randval随机数字赋给
$_SESSION['login_check_num']，在通过用户输入的$_POST进行比较，来判断是否正确。达到需要实现的功能，需要修改php.ini文件，使php支持GD库。
?php
//调用此页面，如果下面的式子成立，则生成验证码图片
if($_GET["action"]=="verifycode")
{
rand_create();
}
//验证码图片生成
function rand_create()
{
//通知浏览器将要输出PNG图片
Header("Content-type: image/PNG");
//准备好随机数发生器种子
srand((double)microtime()*1000000);
//准备图片的相关参数
$im = imagecreate(62,20);
$black = ImageColorAllocate($im, 0,0,0); //RGB黑色标识符 $white =
ImageColorAllocate($im, 255,255,255); //RGB白色标识符 $gray = ImageColorAllocate($im,
200,200,200); //RGB灰色标识符 //开始作图
imagefill($im,0,0,$gray);
while(($randval=rand()%100000)10000);{
$_SESSION["login_check_num"] = $randval;
//将四位整数验证码绘入图片
imagestring($im, 5, 10, 3, $randval, $black);
}
//加入干扰象素
for($i=0;$i200;$i++){
$randcolor =
ImageColorallocate($im,rand(0,255),rand(0,255),rand(0,255));
imagesetpixel($im, rand()%70 , rand()%30 , $randcolor); }
//输出验证图片
ImagePNG($im);