欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  IT编程

java生成验证码工具类

程序员文章站 2023-11-06 12:06:40
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;...

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。