使用java代码生成随机验证码

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java代码

package com.xinrui.util;import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.image.BufferedImage;import java.util.Random;import javax.imageio.ImageIO;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import org.springframework.stereotype.Component;/** *  * 创建时间：2016年2月21日 下午10:55:43 项目名称：SSI *  * @author 梁志成 * @version 1.0 * @since JDK 1.8.0_21 文件名称：RandomValidateCode.java 类说明：生成图片验证码工具 */@Componentpublic class RandomValidateCode {    /**     * 生成代码     *      */    public static String createValidateCode(int size) {        String seed = "1234567890qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM";        int len = seed.length();        char[] p = new char[size];        for (int i = 0; i < size; i++) {            p[i] = seed.charAt((int) Math.floor(Math.random() * len));        }        return new String(p);    }    private final Random random = new Random();    private final String randString = "123456789ABCDEFGHIJKLMNPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";// 随机产生的字符串    private final int width = 135;// 图片宽    private final int height = 33;// 图片高    private final int lineSize = 50;// 干扰线数量    private final int stringNum = 4;// 随机产生字符数量    private final int fontSize = 30;// 随机产生字符数量    /**     * 生成随机图片     */    public void getRandcode(HttpServletRequest request,            HttpServletResponse response) {        HttpSession session = request.getSession();        // BufferedImage类是具有缓冲区的Image类,Image类是用于描述图像信息的类        BufferedImage image = new BufferedImage(this.width, this.height,                BufferedImage.TYPE_INT_BGR);        Graphics g = image.getGraphics();// 产生Image对象的Graphics对象,改对象可以在图像上进行各种绘制操作        g.fillRect(0, 0, this.width, this.height);        g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE,                this.fontSize));        g.setColor(this.getRandColor(110, 133));        // 绘制干扰线        for (int i = 0; i <= this.lineSize; i++) {            this.drawLine(g);        }        // 绘制随机字符        String randomString = "";        for (int i = 1; i <= this.stringNum; i++) {            randomString = this.drawString(g, randomString, i);        }        session.removeAttribute(Constants.RANDOM_CODE_KEY);        session.setAttribute(Constants.RANDOM_CODE_KEY, randomString);        // System.out.println(randomString);        g.dispose();        try {            // 禁止图像缓存。            response.setHeader("Pragma", "no-cache");            response.setHeader("Cache-Control", "no-cache");            response.setDateHeader("Expires", 0);            // 将内存中的图片通过流动形式输出到客户端            ImageIO.write(image, "JPEG", response.getOutputStream());        } catch (Exception e) {            e.printStackTrace();        }    }    /**     * 获取随机的字符     */    public String getRandomString(int num) {        return String.valueOf(this.randString.charAt(num));    }    /**     * 绘制干扰线     */    private void drawLine(Graphics g) {        int x = this.random.nextInt(this.width);        int y = this.random.nextInt(this.height);        int xl = this.random.nextInt(13);        int yl = this.random.nextInt(15);        g.drawLine(x, y, x + xl, y + yl);    }    /**     * 绘制字符串     */    private String drawString(Graphics g, String randomString, int i) {        g.setFont(this.getFont());        g.setColor(new Color(this.random.nextInt(155),                this.random.nextInt(123), this.random.nextInt(176)));        String rand = String.valueOf(this.getRandomString(this.random                .nextInt(this.randString.length())));        randomString += rand;        g.translate(this.random.nextInt(3), this.random.nextInt(3));        g.drawString(rand, (this.width / this.stringNum - 14) * i,                this.height - 7);        return randomString;    }    /**     * 获得字体     */    private Font getFont() {        return new Font("Times New Roman", Font.CENTER_BASELINE, this.fontSize);    }    /**     * 获得颜色     */    private Color getRandColor(int fc, int bc) {        if (fc > 255) {            fc = 255;        }        if (bc > 255) {            bc = 255;        }        int r = fc + this.random.nextInt(bc - fc - 16);        int g = fc + this.random.nextInt(bc - fc - 14);        int b = fc + this.random.nextInt(bc - fc - 18);        return new Color(r, g, b);    }}

2.controller层

    @RequestMapping(value = "vcode")    public void vcode(HttpServletRequest request, HttpServletResponse response) {        code.getRandcode(request, response);    }

3.html代码

<div class="tips">    <span>验证码        <input type="text" id="vcodetext">        <input id="vcode" type="image" src="vcode.html" onclick="changecode()"             style="position: absolute;">    </span></div>

4.js脚本代码

/** * 生成验证码 */var i = 1;function changecode() {    $("#vcode").attr("src", "vcode.html?v=" + (i++));}

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