java验证码代码.doc

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java验证码代码(转)
产生图片servlet

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.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
* Package name : com.skcc.sample.action File name : VerifyCodeServlet.java
* Author : Administrator Date : 2008-9-4 Description : VerifyCodeServlet
*/
public class VerifyCodeServlet extends HttpServlet {

/**
*
*/
private static final long serialVersionUID = 1L;

/**
* 验证码图片的宽度。
*/
private int width = 60;

/**
* 验证码图片的高度。
*/
private int height = 20;

/**
* 验证码字符个数
*/
private int codeCount = 4;

/**
* xx
*/
private int xx = 0;

/**
* 字体高度
*/
private int fontHeight;

/**
* codeY
*/
private int codeY;

/**
* codeSequence
*/
char[] codeSequence = { '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' };

/**
* 初始化验证图片属性
*/
public void init() throws ServletException {
// 从web.xml中获取初始信息
// 宽度
String strWidth = this.getInitParameter("width");
// 高度
String strHeight = this.getInitParameter("height");
// 字符个数
String strCodeCount = this.getInitParameter("codeCount");

// 将配置的信息转换成数值
try {
if (strWidth != null && strWidth.length() != 0) {
width = Integer.parseInt(strWidth);
}
if (strHeight != null && strHeight.length() != 0) {
height = Integer.parseInt(strHeight);
}
if (strCodeCount != null && strCodeCount.length() != 0) {
codeCount = Integer.parseInt(strCodeCount);
}
} catch (NumberFormatException e) {
e.printStackTrace();
}

xx = width / (codeCount + 1);
fontHeight = height - 2;
codeY = height - 4;

}

/**
* @param req
* @param resp
* @throws ServletException
* @throws java.io.IOException
*/
protected void service(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, java.io.IOException {

// 定义图像buffer
BufferedImage buffImg = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics2D gd = buffImg.createGraphics();

// 创建一个随机数生成器类
Random random = new Random();

// 将图像填充为白色
gd.setColor(Color.WHITE);
gd.fillRect(0, 0, width, height);

// 创建字体，字体的大小应该根据图片的高度来定。
Font font = new Font("Fixedsys", Font.PLAIN, fontHeight);
// 设置字体。
gd.setFont(font);

// 画边框。
gd.setColor(Color.BLACK);
gd.drawRect(0, 0, width - 1, height - 1);

// 随机产生160条干扰线，使图象中的认证码不易被其它程序探测到。
gd.setColor(Color.BLACK);
for (int i = 0; i < 160; i++) {
int x = random.nextInt(width);
int y = random.nextInt(height);
int xl = random.nextInt(12);
int yl = random.nextInt(12);
gd.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;

// 随机产生codeCount数字的验证码。
for (int i = 0; i < codeCount; i++) {
// 得到随机产生的验证码数字。
String strRand = String.valueOf(codeSequence[random.nextInt(36)]);
// 产生随机的颜色分量来构造颜色值，这样输出的每位数字的颜色值都将不同。
red = random.nextInt(255);
green = random.nextInt(255);
blue = random.nextInt(255);

// 用随机产生的颜色将验证码绘制到图像中。
gd.setColor(new Color(red, green, blue));
gd.drawString(strRand, (i + 1) * xx, codeY);

// 将产生的四个随机数组合在一起。
randomCode.append(strRand);
}
// 将四位数字的验证码保存到Session中。
HttpSession session = req.getSession();
session.setAttribute("validateCode", randomCode.toString());

// 禁止图像缓存。
resp.setHeader("Pragma", "no-cache");
resp.setHeader("Cache-Control", "no-cache");
resp.setDateHeader("Expires", 0);

resp.setContentType("image/jpeg");

// 将图像输出到Servlet输出流中。
ServletOutputStream sos = resp.getOutputStream();
ImageIO.write(buffImg, "jpeg", sos);
sos.close();
}
}

产生结果servlet

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
* Package name : com.skcc.sample.action File name : ResultServlet.java Author :
* Administrator Date : 2008-9-4 Description : ResultServlet
*/
public class ResultServlet extends HttpServlet {

/**
*
*/
private static final long serialVersionUID = 1L;

/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request
* the request send by the client to the server
* @param response
* the response send by the server to the client
* @throws ServletException
* if an error occurred
* @throws IOException
* if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

doPost(request, response);
}

/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to
* post.
*
* @param request
* the request send by the client to the server
* @param response
* the response send by the server to the client
* @throws ServletException
* if an error occurred
* @throws IOException
* if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

response.setContentType("text/html;charset=utf-8");
String validateC = (String) request.getSession().getAttribute(
"validateCode");
String veryCode = request.getParameter("veryCode");
PrintWriter out = response.getWriter();
if (veryCode == null || "".equals(veryCode)) {
out.println("验证码为空");
} else {
if (validateC.equals(veryCode)) {
out.println("验证码正确");
} else {
out.println("验证码错误");
}
}
out.flush();
out.close();
}
}
js文件

function changeImg() {
var imgSrc = $("#imgObj");
var src = imgSrc.attr("src");
imgSrc.attr("src", chgUrl(src));
}
//时间戳
//为了使每次生成图片不一致，即不让浏览器读缓存，所以需要加上时间戳
function chgUrl(url) {
var timestamp = (new Date()).valueOf();
url = url.substring(0, 17);
if ((url.indexOf("&") >= 0)) {
url = url + "¡Átamp=" + timestamp;
} else {
url = url + "?timestamp=" + timestamp;
}
return url;
}

function isRightCode() {
var code = $("#veryCode").attr("value");
code = "c=" + code;
$.ajax( {
type : "POST",
url : "resultServlet",
data : code,
success : callback
});
}

function callback(data) {
$("#info").html(data);
} 

页面verifyCode.jsp

<%@ page language="java" contentType="text/html; charset=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">
<script type="text/javascript" src="js/verifyCode.js"></script>
<script type="text/javascript" src="js/jquery.js"></script>
<title>test verify code</title>
</head>
<body>
<input id="veryCode" name="veryCode" type="text" />
<img id="imgObj" alt="" src="verifyCodeServlet" />
<a href="#" onclick="changeImg()">换一张</a>
<input type="button" value="验证" onclick="isRightCode()" />
<div id="info"></div>
</body>
</html>

最后记得配好web.xml

<servlet>
<servlet-name>VerifyCodeServlet</servlet-name>
<servlet-class>com.sample.action.VerifyCodeServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>ResultServlet</servlet-name>
<servlet-class>com.sample.action.ResultServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>VerifyCodeServlet</servlet-name>
<url-pattern>/verifyCodeServlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>ResultServlet</servlet-name>
<url-pattern>/resultServlet</url-pattern>
</servlet-mapping>

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