91 lines
2.8 KiB
Java
91 lines
2.8 KiB
Java
package cn.celess.blog.util;
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import java.awt.*;
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import java.awt.image.BufferedImage;
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import java.util.Random;
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/**
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* @author : xiaohai
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* @date : 2019/04/11 15:42
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*/
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public class VeriCodeUtil {
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// 验证码字符集
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private static final char[] chars = {
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
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'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
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'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',
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'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'};
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// 字符数量
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private static final int SIZE = 4;
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// 干扰线数量
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private static final int LINES = 5;
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// 宽度
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private static final int WIDTH = 80;
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// 高度
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private static final int HEIGHT = 40;
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// 字体大小
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private static final int FONT_SIZE = 30;
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/**
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* 生成随机验证码及图片
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* Object[0]：验证码字符串；
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* Object[1]：验证码图片。
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*/
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public static Object[] createImage() {
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StringBuffer sb = new StringBuffer();
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// 1.创建空白图片
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BufferedImage image = new BufferedImage(
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WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
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// 2.获取图片画笔
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Graphics graphic = image.getGraphics();
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// 3.设置画笔颜色
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graphic.setColor(Color.LIGHT_GRAY);
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// 4.绘制矩形背景
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graphic.fillRect(0, 0, WIDTH, HEIGHT);
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// 5.画随机字符
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Random ran = new Random();
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for (int i = 0; i < SIZE; i++) {
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// 取随机字符索引
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int n = ran.nextInt(chars.length);
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// 设置随机颜色
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graphic.setColor(getRandomColor());
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// 设置字体大小
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graphic.setFont(new Font(
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null, Font.BOLD + Font.ITALIC, FONT_SIZE));
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// 画字符
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graphic.drawString(
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chars[n] + "", i * WIDTH / SIZE, HEIGHT * 2 / 3);
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// 记录字符
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sb.append(chars[n]);
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}
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// 6.画干扰线
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for (int i = 0; i < LINES; i++) {
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// 设置随机颜色
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graphic.setColor(getRandomColor());
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// 随机画线
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graphic.drawLine(ran.nextInt(WIDTH), ran.nextInt(HEIGHT),
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ran.nextInt(WIDTH), ran.nextInt(HEIGHT));
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}
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// 7.返回验证码和图片
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return new Object[]{sb.toString(), image};
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}
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/**
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* 随机取色
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*/
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public static Color getRandomColor() {
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Random ran = new Random();
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Color color = new Color(ran.nextInt(256),
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ran.nextInt(256), ran.nextInt(256));
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return color;
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}
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}
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