add GifCaptcha

CHANGELOG.md

@@ -30,6 +30,7 @@
 * 【all    】     增加Hutool.getAllUtils和printAllUtils方法
 * 【core   】     增加PunyCode（issue#1268@Gitee）
 * 【core   】     ArrayUtil增加isSorted方法（pr#1271@Github）
+* 【captcha】     增加GifCaptcha（pr#1273@Github）
 
 ### Bug修复
 * 【cron   】     修复CronTimer可能死循环的问题（issue#1224@Github）

hutool-captcha/src/main/java/cn/hutool/captcha/CaptchaUtil.java

@@ -84,11 +84,26 @@ public class CaptchaUtil {
 		return new ShearCaptcha(width, height, codeCount, thickness);
 	}
 
+	/**
+	 * 创建GIF验证码
+	 *
+	 * @param width 宽
+	 * @param height 高
+	 * @return {@link GifCaptcha}
+	 */
 	public static GifCaptcha createGifCaptcha(int width, int height) {
 		return new GifCaptcha(width, height);
 	}
 
-    public static GifCaptcha createGifCaptcha(int width, int height, int delay) {
-        return new GifCaptcha(width, height, delay);
+	/**
+	 * 创建GIF验证码
+	 *
+	 * @param width 宽
+	 * @param height 高
+	 * @param codeCount 字符个数
+	 * @return {@link GifCaptcha}
+	 */
+	public static GifCaptcha createGifCaptcha(int width, int height, int codeCount) {
+		return new GifCaptcha(width, height, codeCount);
 	}
 }

hutool-captcha/src/main/java/cn/hutool/captcha/GifCaptcha.java

@@ -3,21 +3,24 @@ package cn.hutool.captcha;
 
 import cn.hutool.core.img.gif.AnimatedGifEncoder;
 import cn.hutool.core.util.ObjectUtil;
+import cn.hutool.core.util.RandomUtil;
 
-import java.awt.*;
+import java.awt.AlphaComposite;
+import java.awt.Color;
+import java.awt.Graphics2D;
+import java.awt.Image;
 import java.awt.image.BufferedImage;
 import java.io.ByteArrayOutputStream;
-import java.util.Random;
 
 /**
  * Gif验证码类
+ *
+ * @author hsoftxl
+ * @since 5.5.2
  */
 public class GifCaptcha extends AbstractCaptcha {
 	private static final long serialVersionUID = 7091627304326538464L;
 
-    private final Random RANDOM = new Random();
-    // 帧延迟 (默认100)
-    private int delay = 100;
 	//量化器取样间隔 - 默认是10ms
 	private int quality = 10;
 	// 帧循环次数
@@ -31,17 +34,17 @@ public class GifCaptcha extends AbstractCaptcha {
 	/**
 	 * 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
+	 * @param width  验证码宽度
+	 * @param height 验证码高度
 	 */
 	public GifCaptcha(int width, int height) {
 		this(width, height, 100);
 	}
 
 	/**
-     * @param width     -验证码宽度
-     * @param height    -验证码高度
-     * @param codeCount -验证码个数
+	 * @param width     验证码宽度
+	 * @param height    验证码高度
+	 * @param codeCount 验证码个数
 	 */
 	public GifCaptcha(int width, int height, int codeCount) {
 		super(width, height, codeCount, 10);
@@ -54,12 +57,14 @@ public class GifCaptcha extends AbstractCaptcha {
 	 * 值更大(大于20)不产生显著的改善速度
 	 *
 	 * @param quality 大于1
+	 * @return this
 	 */
-    public void setQuality(int quality) {
+	public GifCaptcha setQuality(int quality) {
 		if (quality < 1) {
 			quality = 1;
 		}
 		this.quality = quality;
+		return this;
 	}
 
 	/**
@@ -68,29 +73,35 @@ public class GifCaptcha extends AbstractCaptcha {
 	 * 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 void setRepeat(int repeat) {
+	public GifCaptcha 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 void setMaxColor(int maxColor) {
+	public GifCaptcha setMaxColor(int maxColor) {
 		this.maxColor = maxColor;
+		return this;
 	}
 
 	/**
 	 * 设置验证码字符颜色
 	 *
 	 * @param minColor 颜色
+	 * @return this
 	 */
-    public void setMinColor(int minColor) {
+	public GifCaptcha setMinColor(int minColor) {
 		this.minColor = minColor;
+		return this;
 	}
 
 	@Override
@@ -102,6 +113,8 @@ public class GifCaptcha extends AbstractCaptcha {
 		//生成字符
 		gifEncoder.start(out);
 		gifEncoder.setQuality(quality);//设置量化器取样间隔
+		// 帧延迟 (默认100)
+		int delay = 100;
 		gifEncoder.setDelay(delay);//设置帧延迟
 		gifEncoder.setRepeat(repeat);//帧循环次数
 		BufferedImage frame;
@@ -149,10 +162,14 @@ public class GifCaptcha extends AbstractCaptcha {
 			g2d.setComposite(this.textAlpha);
 		}
 		for (int i = 0; i < chars.length; i++) {
-            ac = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, getPellucidity(chars.length, flag, i));
+			ac = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, getAlpha(chars.length, flag, i));
 			g2d.setComposite(ac);
 			g2d.setColor(fontColor[i]);
-            g2d.drawOval(num(width), num(height), num(5, 30), 5 + num(5, 30));//绘制椭圆边框
+			g2d.drawOval(
+					RandomUtil.randomInt(width),
+					RandomUtil.randomInt(height),
+					RandomUtil.randomInt(5, 30), 5 + RandomUtil.randomInt(5, 30)
+			);//绘制椭圆边框
 			g2d.drawString(words[i] + "", x + (font.getSize() + m) * i, y);
 		}
 		g2d.dispose();
@@ -164,7 +181,7 @@ public class GifCaptcha extends AbstractCaptcha {
 	 *
 	 * @return float 透明度
 	 */
-    private float getPellucidity(int v, int i, int j) {
+	private float getAlpha(int v, int i, int j) {
 		int num = i + j;
 		float r = (float) 1 / v;
 		float s = (v + 1) * r;
@@ -193,29 +210,9 @@ public class GifCaptcha extends AbstractCaptcha {
 			min = 0;
 			max = 255;
 		}
-        return new Color(min + num(max - min), min + num(max - min), min + num(max - min));
+		return new Color(
+				RandomUtil.randomInt(min, max),
+				RandomUtil.randomInt(min, max),
+				RandomUtil.randomInt(min, max));
 	}
-
-
-    /**
-     * 产生两个数之间的随机数
-     *
-     * @param min 小数
-     * @param max 比min大的数
-     * @return int 随机数字
-     */
-    private int num(int min, int max) {
-        return min + RANDOM.nextInt(max - min);
-    }
-
-    /**
-     * 产生0--num的随机数,不包括num
-     *
-     * @param num 数字
-     * @return int 随机数字
-     */
-    private int num(int num) {
-        return RANDOM.nextInt(num);
-    }
-
 }

hutool-captcha/src/test/java/cn/hutool/captcha/CaptchaTest.java

@@ -105,7 +105,7 @@ public class CaptchaTest {
 	@Ignore
 	public void GifCaptchaTest() {
 		GifCaptcha captcha = CaptchaUtil.createGifCaptcha(200, 100, 4);
-        captcha.write("f:/gif_captcha.gif");
+		captcha.write("d:/test/gif_captcha.gif");
 		assert captcha.verify(captcha.getCode());
 	}
 }