Spring mvc实现验证码

来源：互联网发布：快手解析软件编辑：程序博客网时间：2024/06/16 07:34

参考博客：
http://www.cnblogs.com/xql4j/archive/2013/03/30/2990998.html

1.验证码封装类

package com.huangqi.util;import java.util.Random;import java.awt.image.BufferedImage;import java.awt.Graphics;import java.awt.Font;import java.awt.Color;/** * 验证码生成器类，可生成数字�?大写、小写字母及三�?混合类型的验证码�?支持自定义验证码字符数量�?支持自定义验证码图片的大小； 支持自定义需排除的特殊字符； * 支持自定义干扰线的数量； 支持自定义验证码图文颜色 */public class ValidateCode {    /**     * 验证码类型为仅数�?0~9     */    public static final int TYPE_NUM_ONLY = 0;    /**     * 验证码类型为仅字母，即大写�?小写字母混合     */    public static final int TYPE_LETTER_ONLY = 1;    /**     * 验证码类型为数字、大写字母�?小写字母混合     */    public static final int TYPE_ALL_MIXED = 2;    /**     * 验证码类型为数字、大写字母混�?     */    public static final int TYPE_NUM_UPPER = 3;    /**     * 验证码类型为数字、小写字母混�?     */    public static final int TYPE_NUM_LOWER = 4;    /**     * 验证码类型为仅大写字�?     */    public static final int TYPE_UPPER_ONLY = 5;    /**     * 验证码类型为仅小写字�?     */    public static final int TYPE_LOWER_ONLY = 6;    private ValidateCode() {    }    /**     * 生成验证码字符串     *      * @param type     *            验证码类型，参见本类的静态属�?     * @param length     *            验证码长度，大于0的整�?     * @param exChars     *            �?��除的特殊字符（仅对数字�?字母混合型验证码有效，无�?��除则为null�?     * @return 验证码字符串     */    public static String generateTextCode(int type, int length, String exChars) {        if (length <= 0)            return "";        StringBuffer code = new StringBuffer();        int i = 0;        Random r = new Random();        switch (type) {        // 仅数�?        case TYPE_NUM_ONLY:            while (i < length) {                int t = r.nextInt(10);                if (exChars == null || exChars.indexOf(t + "") < 0) {// 排除特殊字符                    code.append(t);                    i++;                }            }            break;        // 仅字母（即大写字母�?小写字母混合�?        case TYPE_LETTER_ONLY:            while (i < length) {                int t = r.nextInt(123);                if ((t >= 97 || (t >= 65 && t <= 90)) && (exChars == null || exChars.indexOf((char) t) < 0)) {                    code.append((char) t);                    i++;                }            }            break;        // 数字、大写字母�?小写字母混合        case TYPE_ALL_MIXED:            while (i < length) {                int t = r.nextInt(123);                if ((t >= 97 || (t >= 65 && t <= 90) || (t >= 48 && t <= 57))                        && (exChars == null || exChars.indexOf((char) t) < 0)) {                    code.append((char) t);                    i++;                }            }            break;        // 数字、大写字母混�?        case TYPE_NUM_UPPER:            while (i < length) {                int t = r.nextInt(91);                if ((t >= 65 || (t >= 48 && t <= 57)) && (exChars == null || exChars.indexOf((char) t) < 0)) {                    code.append((char) t);                    i++;                }            }            break;        // 数字、小写字母混�?        case TYPE_NUM_LOWER:            while (i < length) {                int t = r.nextInt(123);                if ((t >= 97 || (t >= 48 && t <= 57)) && (exChars == null || exChars.indexOf((char) t) < 0)) {                    code.append((char) t);                    i++;                }            }            break;        // 仅大写字�?        case TYPE_UPPER_ONLY:            while (i < length) {                int t = r.nextInt(91);                if ((t >= 65) && (exChars == null || exChars.indexOf((char) t) < 0)) {                    code.append((char) t);                    i++;                }            }            break;        // 仅小写字�?        case TYPE_LOWER_ONLY:            while (i < length) {                int t = r.nextInt(123);                if ((t >= 97) && (exChars == null || exChars.indexOf((char) t) < 0)) {                    code.append((char) t);                    i++;                }            }            break;        }        return code.toString();    }    /**     * 已有验证码，生成验证码图�?     *      * @param textCode     *            文本验证�?     * @param width     *            图片宽度     * @param height     *            图片高度     * @param interLine     *            图片中干扰线的条�?     * @param randomLocation     *            每个字符的高低位置是否随�?     * @param backColor     *            图片颜色，若为null，则采用随机颜色     * @param foreColor     *            字体颜色，若为null，则采用随机颜色     * @param lineColor     *            干扰线颜色，若为null，则采用随机颜色     * @return 图片缓存对象     */    public static BufferedImage generateImageCode(String textCode, int width, int height, int interLine,            boolean randomLocation, Color backColor, Color foreColor, Color lineColor) {        BufferedImage bim = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);        Graphics g = bim.getGraphics();        // 画背景图        g.setColor(backColor == null ? getRandomColor() : backColor);        g.fillRect(0, 0, width, height);        // 画干扰线        Random r = new Random();        if (interLine > 0) {            int x = 0, y = 0, x1 = width, y1 = 0;            for (int i = 0; i < interLine; i++) {                g.setColor(lineColor == null ? getRandomColor() : lineColor);                y = r.nextInt(height);                y1 = r.nextInt(height);                g.drawLine(x, y, x1, y1);            }        }        // 写验证码        // g.setColor(getRandomColor());        // g.setColor(isSimpleColor?Color.BLACK:Color.WHITE);        // 字体大小为图片高度的80%        int fsize = (int) (height * 0.8);        int fx = height - fsize;        int fy = fsize;        g.setFont(new Font("Default", Font.PLAIN, fsize));        // 写验证码字符        for (int i = 0; i < textCode.length(); i++) {            fy = randomLocation ? (int) ((Math.random() * 0.3 + 0.6) * height) : fy;// 每个字符高低是否随机            g.setColor(foreColor == null ? getRandomColor() : foreColor);            g.drawString(textCode.charAt(i) + "", fx, fy);            fx += fsize * 0.9;        }        g.dispose();        return bim;    }    /**     * 生成图片验证�?     *      * @param type     *            验证码类型，参见本类的静态属�?     * @param length     *            验证码字符长度，大于0的整�?     * @param exChars     *            �?��除的特殊字符     * @param width     *            图片宽度     * @param height     *            图片高度     * @param interLine     *            图片中干扰线的条�?     * @param randomLocation     *            每个字符的高低位置是否随�?     * @param backColor     *            图片颜色，若为null，则采用随机颜色     * @param foreColor     *            字体颜色，若为null，则采用随机颜色     * @param lineColor     *            干扰线颜色，若为null，则采用随机颜色     * @return 图片缓存对象     */    public static BufferedImage generateImageCode(int type, int length, String exChars, int width, int height,            int interLine, boolean randomLocation, Color backColor, Color foreColor, Color lineColor) {        String textCode = generateTextCode(type, length, exChars);        BufferedImage bim = generateImageCode(textCode, width, height, interLine, randomLocation, backColor, foreColor,                lineColor);        return bim;    }    /**     * 产生随机颜色     *      * @return     */    private static Color getRandomColor() {        Random r = new Random();        Color c = new Color(r.nextInt(255), r.nextInt(255), r.nextInt(255));        return c;    }}

2.引用

/**     * 生成验证码     * @param request     * @param response     * @throws IOException     */    @RequestMapping(value = "/validateCode")    public void validateCode(HttpServletRequest request, HttpServletResponse response) throws IOException {        response.setHeader("Cache-Control", "no-cache");//使用服务器端控制AJAX页面缓存        String verifyCode = ValidateCode.generateTextCode(ValidateCode.TYPE_NUM_ONLY, 4, null);        request.getSession().setAttribute("validateCode", verifyCode);        response.setContentType("image/jpeg");        BufferedImage bim = ValidateCode.generateImageCode(verifyCode, 90, 30, 3, true, Color.WHITE, Color.BLACK, null);        ImageIO.write(bim, "JPEG", response.getOutputStream());    }

3.jsp页面的引用

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>  <%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">    <title>My JSP 'index.jsp' starting page</title>    <meta http-equiv="pragma" content="no-cache">    <meta http-equiv="cache-control" content="no-cache">    <meta http-equiv="expires" content="0">        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">    <meta http-equiv="description" content="This is my page">    <!--    <link rel="stylesheet" type="text/css" href="styles.css">    -->  </head>  <body>    <h1>login page</h1>      <form id="" action="dologin" method="post">          <label>User Name</label> <input tyep="text" name="userName"              maxLength="40" /> <label>Password</label><input type="password"              name="password" />             <li>验证码：<input type="text" name="validateCode" />&nbsp;&nbsp;<img id="validateCodeImg" src="<%=basePath%>/validateCode" />&nbsp;&nbsp;<a href="#" onclick="javascript:reloadValidateCode();">看不清？</a></li><input type="submit" value="login" />      </form>      <%--用于输入后台返回的验证错误信息 --%>      <P><c:out value="${message }" /></P>    </body>    <script src="js/jquery.min.js"></script>    <script type="text/javascript">    <!--    function reloadValidateCode(){        $("#validateCodeImg").attr("src","<%=basePath%>/validateCode?data=" + new Date() + Math.floor(Math.random()*24));    }    //-->    </script></html>

项目源码：http://pan.baidu.com/s/1qYBtvnm

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