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org.aoju.bus.extra.captcha.provider.GifProvider Maven / Gradle / Ivy
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* *
* The MIT License (MIT) *
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* Copyright (c) 2015-2021 aoju.org and other contributors. *
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* Permission is hereby granted, free of charge, to any person obtaining a copy *
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* The above copyright notice and this permission notice shall be included in *
* all copies or substantial portions of the Software. *
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package org.aoju.bus.extra.captcha.provider;
import org.aoju.bus.core.image.GifEncoder;
import org.aoju.bus.core.toolkit.ObjectKit;
import org.aoju.bus.core.toolkit.RandomKit;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
/**
* Git验证码
*
* @author Kimi Liu
* @version 6.2.2
* @since JDK 1.8+
*/
public class GifProvider extends AbstractProvider {
/**
* 量化器取样间隔 - 默认是10ms
*/
private int quality = 10;
/**
* 帧循环次数
*/
private int repeat = 0;
/**
* 设置随机颜色时，最小的取色范围
*/
private int minColor = 0;
/**
* 设置随机颜色时，最大的取色范围
*/
private int maxColor = 255;
/**
* 可以设置验证码宽度，高度的构造函数
*
* @param width 验证码宽度
* @param height 验证码高度
*/
public GifProvider(int width, int height) {
this(width, height, 5);
}
/**
* @param width 验证码宽度
* @param height 验证码高度
* @param codeCount 验证码个数
*/
public GifProvider(int width, int height, int codeCount) {
super(width, height, codeCount, 10);
}
/**
* 设置图像的颜色量化(转换质量 由GIF规范允许的最大256种颜色)。
* 低的值(最小值= 1)产生更好的颜色,但处理显著缓慢。
* 10是默认,并产生良好的颜色而且有以合理的速度。
* 值更大(大于20)不产生显著的改善速度
*
* @param quality 大于1
* @return this
*/
public GifProvider setQuality(int quality) {
if (quality < 1) {
quality = 1;
}
this.quality = quality;
return this;
}
/**
* 设置GIF帧应该播放的次数。
* 默认是 0; 0意味着无限循环。
* 必须在添加的第一个图像之前被调用。
*
* @param repeat 必须大于等于0
* @return this
*/
public GifProvider setRepeat(int repeat) {
if (repeat >= 0) {
this.repeat = repeat;
}
return this;
}
/**
* 设置验证码字符颜色
*
* @param maxColor 颜色
* @return this
*/
public GifProvider setMaxColor(int maxColor) {
this.maxColor = maxColor;
return this;
}
/**
* 设置验证码字符颜色
*
* @param minColor 颜色
* @return this
*/
public GifProvider setMinColor(int minColor) {
this.minColor = minColor;
return this;
}
@Override
public void create() {
generateCode();
final ByteArrayOutputStream out = new ByteArrayOutputStream();
// gif编码类
GifEncoder gifEncoder = new GifEncoder();
// 生成字符
gifEncoder.start(out);
// 设置量化器取样间隔
gifEncoder.setQuality(quality);
// 帧延迟 (默认100)
int delay = 100;
// 设置帧延迟
gifEncoder.setDelay(delay);
// 帧循环次数
gifEncoder.setRepeat(repeat);
BufferedImage frame;
char[] chars = code.toCharArray();
Color[] fontColor = new Color[chars.length];
for (int i = 0; i < chars.length; i++) {
fontColor[i] = getRandomColor(minColor, maxColor);
frame = graphicsImage(chars, fontColor, chars, i);
gifEncoder.addFrame(frame);
frame.flush();
}
gifEncoder.finish();
this.imageBytes = out.toByteArray();
}
@Override
protected Image createImage(String code) {
return null;
}
/**
* 画随机码图
*
* @param fontColor 随机字体颜色
* @param words 字符数组
* @param flag 透明度使用
* @return BufferedImage
*/
private BufferedImage graphicsImage(char[] chars, Color[] fontColor, char[] words, int flag) {
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
// 或得图形上下文
Graphics2D g2d = image.createGraphics();
// 利用指定颜色填充背景
g2d.setColor(ObjectKit.defaultIfNull(this.background, Color.WHITE));
g2d.fillRect(0, 0, width, height);
AlphaComposite ac;
// 字符的y坐标
float y = (height >> 1) + (font.getSize() >> 1);
float m = 1.0f * (width - (chars.length * font.getSize())) / chars.length;
// 字符的x坐标
float x = Math.max(m / 2.0f, 2);
g2d.setFont(font);
// 指定透明度
if (null != this.textAlpha) {
g2d.setComposite(this.textAlpha);
}
for (int i = 0; i < chars.length; i++) {
ac = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, getAlpha(chars.length, flag, i));
g2d.setComposite(ac);
g2d.setColor(fontColor[i]);
g2d.drawOval(
RandomKit.randomInt(width),
RandomKit.randomInt(height),
RandomKit.randomInt(5, 30), 5 + RandomKit.randomInt(5, 30)
);
// 绘制椭圆边框
g2d.drawString(words[i] + "", x + (font.getSize() + m) * i, y);
}
g2d.dispose();
return image;
}
/**
* 获取透明度,从0到1,自动计算步长
*
* @return float 透明度
*/
private float getAlpha(int v, int i, int j) {
int num = i + j;
float r = (float) 1 / v;
float s = (v + 1) * r;
return num > v ? (num * r - s) : num * r;
}
/**
* 通过给定范围获得随机的颜色
*
* @return Color 获得随机的颜色
*/
private Color getRandomColor(int min, int max) {
if (min > 255) {
min = 255;
}
if (max > 255) {
max = 255;
}
if (min < 0) {
min = 0;
}
if (max < 0) {
max = 0;
}
if (min > max) {
min = 0;
max = 255;
}
return new Color(
RandomKit.randomInt(min, max),
RandomKit.randomInt(min, max),
RandomKit.randomInt(min, max));
}
}
