java生成验证码工具类

java生成验证码工具类，供大家参考，具体内容如下

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));
    }
  }
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。