工具类-随机产生指定位数的验证码

来源：互联网发布：线性规划的单纯形算法编辑：程序博客网时间：2024/06/05 02:58

public class ImageUtil {    private static String[] strs = { "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "m", "n", "p", "q", "r",            "s", "t", "u", "v", "w", "x", "y", "z", "2", "3", "4", "5", "6", "7", "8", "9" };    /**     * 方法的描述： 随机生成随字符串     * @param n  生成字符个数     * @return String 生成的字符串     */    private static String getRondomStr(int n) {        StringBuffer s = new StringBuffer();        for (int i = 0; i < n; i++) {            String temp = "";            // 随机产生下标            Random r = new Random();            int a = r.nextInt(strs.length);            if (a < 24) {                int b = r.nextInt(100);                if (b % 2 == 0) {                    temp = strs[a].toUpperCase();                    s.append(temp);                } else {                    s.append(strs[a]);                }            } else {                s.append(strs[a]);            }        }        return s.toString();    }    /**     * 方法的描述：生成验证码图片（默认的宽和高）     * @param str  验证码字符串     * @param out  输出流     * @throws IOException     */    public static void getImage(String str, OutputStream out) throws IOException {        getImage1(115, 37, str, out);    }    /**     * 方法的描述：创建图片     * @param width  图片宽     * @param height 图片高     * @param str  图片上需要画的字符串     * @param out 输出流     * @throws IOException     */    public static void getImage1(int width, int height, String str, OutputStream out) throws IOException {        BufferedImage imag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);        Graphics2D g = (Graphics2D) imag.getGraphics();        g.setColor(getRundomRGB(120, 255));        g.fillRect(0, 0, width, height);        g.setColor(getRundomRGB(145, 175));        Random rd = new Random();        for (int i = 0; i < 100; i++) {            if (i % 4 == 0)                g.setColor(getRundomRGB(120, 220));            int x = rd.nextInt(width);            int y = rd.nextInt(height);            int x1 = rd.nextInt(width / 3);            int y1 = rd.nextInt(height / 3);            g.drawLine(x, y, x + x1, y + y1);        }        char[] c = str.toCharArray();        g.setFont(new Font("Serif", Font.BOLD, 24));        for (int i = 0; i < c.length; i++) {            g.setColor(getRundomRGB(0, 90));            if (rd.nextInt(1000) % 2 == 0) {                g.rotate(.8, width / 10 + (width / 4) * i, height + height / 2 + height / 12);                g.drawString(String.valueOf(c[i]), width / 4 - width / 5 - width / 7 + (width / 4) * i,                        height - height / 8);                g.rotate(-.8, width / 10 + (width / 4) * i, height + height / 2 + height / 12);            } else {                g.drawString(String.valueOf(c[i]), width / 4 - width / 6 + (width / 4) * i, height - height / 4);            }        }        for (int i = 0; i < 20; i++) {            if (i % 2 == 0)                g.setColor(getRundomRGB(142, 220));            int x = rd.nextInt(width);            int y = rd.nextInt(height);            int x1 = rd.nextInt(width / 3);            int y1 = rd.nextInt(height / 3);            g.drawLine(x, y, x + x1, y + y1);        }        g.dispose();        ImageIO.write(imag, "png", out);    }    // 颜色随机生成    private static Color getRundomRGB(int pr, int pg) {        if (pr > 255)            pr = 255;        if (pg > 255)            pg = 255;        Random rd = new Random();        int r = pr + rd.nextInt(pg - pr);        int g = pr + rd.nextInt(pg - pr);        int b = pr + rd.nextInt(pg - pr);        return new Color(r, g, b);    }public static void main(String[] args) throws IOException {FileOutputStream out = new FileOutputStream("E:/c.png");String str = ImageUtil.getRondomStr(4);System.out.println(str);ImageUtil.getImage(str, out);}}

运行main方法，在指定盘符生成指定位数的验证码。

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