java生成验证码工具类_Java教程

java生成验证码工具类，供大家参考，具体内容如下

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									package com.demo.utils;

									import java.awt.BasicStroke;

									import java.awt.Color;

									import java.awt.Font;

									import java.awt.Graphics2D;

									import java.awt.RenderingHints;

									import java.awt.geom.QuadCurve2D;

									import java.awt.image.BufferedImage;

									import java.io.FileOutputStream;

									import java.io.IOException;

									import java.io.OutputStream;

									import java.util.Random;

									import javax.imageio.ImageIO;

									/**

									 * 生成验证码

									 * @author dongyangyang

									 * @Date 2017/3/13 12:31

									 * @Version 1.0

									 *

									 */

									public class AuthCodeUtils {

									  private final static Random random = new Random();

									  // 随机字体样式

									  private final static int[] fontStyle = { Font.HANGING_BASELINE, Font.ITALIC, Font.LAYOUT_LEFT_TO_RIGHT, Font.LAYOUT_NO_LIMIT_CONTEXT, Font.LAYOUT_NO_START_CONTEXT,

									      Font.LAYOUT_RIGHT_TO_LEFT, Font.CENTER_BASELINE, Font.PLAIN, Font.ROMAN_BASELINE, Font.TRUETYPE_FONT, Font.TYPE1_FONT, Font.BOLD };

									  private final static String[] font = { "Ravie", "Forte", "Arial", "Courier" };

									  private final static int[] xarr = { 23, 24, 19, 20, 21 };

									  private final static int[] yarr = { 20, 21, 22, 23, 24, 25, 16, 17, 18 };

									  private final static int[] font_size = { 28, 29, 30, 21, 22, 23, 24, 27, 26, 25 };

									  /**

									   * 画随机码图

									   * @param out

									   * @param width

									   * @param height

									   * @throws IOException

									   */

									  public static void draw(OutputStream out, String value) throws IOException {

									    int width = 100, height = 40;

									    BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

									    Graphics2D g = (Graphics2D) bi.getGraphics();

									    g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

									    g.setColor(randColor(240, 255));

									    g.fillRect(0, 0, width, height);

									    g.drawRect(1, 1, width - 2, height - 2);

									    for (int i = 0; i < 10; i++) {

									      g.setColor(randColor(150, 250));

									      g.drawOval(random.nextInt(110), random.nextInt(24), 5 + random.nextInt(10), 5 + random.nextInt(10));

									    }

									    g.setFont(getFont());

									    g.setColor(randColor(xarr[(int) (Math.random() * 5)], 254));

									    for (int i = 0, len = value.length(); i < len; i++) {

									      String rand = String.valueOf(value.charAt(i));

									      int degree = random.nextInt(23);

									      if (i % 2 == 0) {

									        degree = degree * (-1);

									      }

									      int x = xarr[(int) (Math.random() * 5)] * i, y = yarr[(int) (Math.random() * 8)];

									      g.rotate(Math.toRadians(degree), x, y);

									      g.setColor(randColor(48, 254));

									      g.drawString(rand, x + 8, y + 10);

									      g.rotate(-Math.toRadians(degree), x, y);

									    }

									    // 图片中间线

									    g.setColor(randColor(0, 200));

									    // width是线宽,float型

									    BasicStroke bs = new BasicStroke(2);

									    g.setStroke(bs);

									    // 画出曲线

									    QuadCurve2D.Double curve = new QuadCurve2D.Double(0d, random.nextInt(height - 8) + 4, width / 2, height / 2, width, random.nextInt(height - 8) + 4);

									    g.draw(curve);

									    // 销毁图像

									    g.dispose();

									    ImageIO.write(bi, "png", out);

									  }

									  private static Font getFont() {

									    return new Font(font[(int) (Math.random() * 4)], fontStyle[(int) (Math.random() * 12)], font_size[(int) (Math.random() * 10)]);

									  }

									  private static Color randColor(int fc, int bc) {// 给定范围获得随机颜色

									    if (fc > 255) {

									      fc = 255;

									    }

									    if (bc > 255) {

									      bc = 255;

									    }

									    int r = fc + random.nextInt(bc - fc);

									    int g = fc + random.nextInt(bc - fc);

									    int b = fc + random.nextInt(bc - fc);

									    return new Color(r, g, b);

									  }

									  private static char[] c = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'j', 'k', 'm', 'n', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F',

									      'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '1', '3', '5', '6', '7', '8', '9' };

									  public static String getRandom(int size) {

									    StringBuilder sb = new StringBuilder();

									    for (int i = 0; i < size; i++) {

									      sb.append(c[Math.abs(random.nextInt()) % c.length]);

									    }

									    return sb.toString();

									  }

									  public static void main(String[] args) throws IOException {

									    for (int i = 1; i < 10; i++) {

									      FileOutputStream out = new FileOutputStream("D:\\bb"+ i +".png");

									      draw(out, getRandom(4));

									    }

									  }

									}