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这篇文章主要介绍了java如何生成验证码工具类，具有一定借鉴价值，感兴趣的朋友可以参考下，希望大家阅读完这篇文章之后大有收获，下面让小编带着大家一起了解一下。
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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));
}
}
}感谢你能够认真阅读完这篇文章，希望小编分享的“java如何生成验证码工具类”这篇文章对大家有帮助，同时也希望大家多多支持创新互联，关注创新互联行业资讯频道，更多相关知识等着你来学习!
