U 解决 java17默认不支持 FontDesignMetrics 类的问题， 故剔除该类 使用其它算法替代

src/main/java/cloud/tianai/captcha/generator/AbstractImageCaptchaGenerator.java

@@ -57,13 +57,15 @@ public abstract class AbstractImageCaptchaGenerator implements ImageCaptchaGener
         if (init) {
             return this;
         }
+        init = true;
         try {
+            log.info("图片验证码[{}]初始化...", this.getClass().getSimpleName());
             doInit();
         } catch (Exception e) {
+            init = false;
             log.error("[{}]初始化失败,ex", this.getClass().getSimpleName(), e);
             throw e;
         }
-        init = true;
         return this;
     }
 

src/main/java/cloud/tianai/captcha/generator/common/util/CaptchaImageUtils.java

@@ -322,7 +322,7 @@ public class CaptchaImageUtils {
     public static BufferedImage drawWordImg(Color fontColor,
                                             String word,
                                             Font font,
-                                            FontDesignMetrics metrics,
+                                            float fontTopCoef,
                                             int imgWidth,
                                             int imgHeight,
                                             float deg) {
@@ -333,7 +333,7 @@ public class CaptchaImageUtils {
         g.setColor(fontColor);
         g.setFont(font);
         float left = (imgWidth - font.getSize()) / 2f;
-        float top = (imgHeight - font.getSize()) / 2f + metrics.getAscent() - 6;
+        float top = (imgHeight - font.getSize()) / 2f + font.getSize() - fontTopCoef;
         g.rotate(Math.toRadians(deg), imgWidth / 2f, imgHeight / 2f);
         g.drawString(word, left, top);
         g.dispose();
@@ -405,7 +405,6 @@ public class CaptchaImageUtils {
      *
      * @param data                 验证码内容
      * @param font                 字体包
-     * @param metrics              FontDesignMetrics
      * @param width                验证码宽度
      * @param height               验证码高度
      * @param startX               起始X
@@ -416,7 +415,6 @@ public class CaptchaImageUtils {
      */
     public static BufferedImage genSimpleImgCaptcha(String data,
                                                     Font font,
-                                                    FontDesignMetrics metrics,
                                                     int width,
                                                     int height,
                                                     float startX,

src/main/java/cloud/tianai/captcha/generator/impl/CacheImageCaptchaGenerator.java

@@ -1,6 +1,5 @@
 package cloud.tianai.captcha.generator.impl;
 
-import cloud.tianai.captcha.common.util.NamedThreadFactory;
 import cloud.tianai.captcha.common.util.NamedThreadFactory;
 import cloud.tianai.captcha.generator.ImageCaptchaGenerator;
 import cloud.tianai.captcha.generator.common.model.dto.GenerateParam;
@@ -69,8 +68,7 @@ public class CacheImageCaptchaGenerator implements ImageCaptchaGenerator {
     private void init(int z) {
         this.size = z;
         // 初始化一个队列扫描
-        scheduledExecutor.scheduleAtFixedRate(() -> {
+        scheduledExecutor.scheduleAtFixedRate(() -> queueMap.forEach((k, queue) -> {
-            queueMap.forEach((k, queue) -> {
             try {
                 AtomicInteger pos = posMap.computeIfAbsent(k, k1 -> new AtomicInteger(0));
                 int addCount = 0;
@@ -109,9 +107,7 @@ public class CacheImageCaptchaGenerator implements ImageCaptchaGenerator {
                 // 休眠
                 sleep();
             }
-            });
+        }), 0, period, TimeUnit.MILLISECONDS);
-
-        }, 0, period, TimeUnit.MILLISECONDS);
     }
 
     private void sleep() {
@@ -121,6 +117,11 @@ public class CacheImageCaptchaGenerator implements ImageCaptchaGenerator {
         }
     }
 
+    @Override
+    public ImageCaptchaGenerator init() {
+        return target.init();
+    }
+
     @SneakyThrows
     @Override
     public ImageCaptchaInfo generateCaptchaImage(String type) {
@@ -176,20 +177,4 @@ public class CacheImageCaptchaGenerator implements ImageCaptchaGenerator {
     public ImageCaptchaResourceManager getImageResourceManager() {
         return target.getImageResourceManager();
     }
-
-
-//    public static void main(String[] args) throws InterruptedException {
-//        SliderCaptchaTemplate captchaTemplate = new DefaultSliderCaptchaTemplate("jpeg", "png", true);
-//
-//        captchaTemplate = new CacheSliderCaptchaTemplate(captchaTemplate, 20);
-//        TimeUnit.SECONDS.sleep(5);
-//        for (int i = 0; i < 100; i++) {
-//            long start = System.currentTimeMillis();
-//            SliderCaptchaInfo info = captchaTemplate.getSlideImageInfo();
-//            long end = System.currentTimeMillis();
-//            System.out.println("耗时:" + (end - start));
-//            TimeUnit.MILLISECONDS.sleep(10);
-//        }
-//    }
-
 }

src/main/java/cloud/tianai/captcha/generator/impl/StandardRandomWordClickImageCaptchaGenerator.java

@@ -13,10 +13,11 @@ import cloud.tianai.captcha.resource.impl.provider.ClassPathResourceProvider;
 import lombok.Getter;
 import lombok.Setter;
 import lombok.SneakyThrows;
-import sun.font.FontDesignMetrics;
 
+import javax.imageio.ImageIO;
 import java.awt.*;
 import java.awt.image.BufferedImage;
+import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.List;
@@ -36,9 +37,6 @@ public class StandardRandomWordClickImageCaptchaGenerator extends AbstractClickI
     protected Font font;
     @Getter
     @Setter
-    protected FontDesignMetrics metrics;
-    @Getter
-    @Setter
     protected Integer clickImgWidth = 80;
     @Getter
     @Setter
@@ -50,6 +48,16 @@ public class StandardRandomWordClickImageCaptchaGenerator extends AbstractClickI
     @Setter
     protected int tipImageInterferencePointNum = 5;
 
+    /**
+     * 因为在画文字图形的时候 y 值不能准确通过 除法计算得出， 字体大小不一致中间的容错值不可估计，
+     * 所以通过 线性回归模型 计算出  intercept和coef 用于计算 容错值
+     * 训练数据为 宋体 字体大小为 30~150 随机选择7组数据进行训练， 训练后r2结果为 0.9967106324620846
+     */
+    protected float intercept = 0.39583333f;
+    protected float coef = 0.14645833f;
+
+    protected float currentFontTopCoef = 0.0f;
+
     @SneakyThrows
     public StandardRandomWordClickImageCaptchaGenerator(ImageCaptchaResourceManager imageCaptchaResourceManager, boolean initDefaultResource) {
         super(imageCaptchaResourceManager, initDefaultResource);
@@ -67,7 +75,8 @@ public class StandardRandomWordClickImageCaptchaGenerator extends AbstractClickI
             Font font = Font.createFont(Font.TRUETYPE_FONT, inputStream);
             this.font = font.deriveFont(Font.BOLD, 70);
         }
-        this.metrics = FontDesignMetrics.getMetrics(font);
+        // 计算容错
+        currentFontTopCoef = coef * font.getSize() + intercept;
         if (initDefaultResource) {
             initDefaultResource();
         }
@@ -88,20 +97,25 @@ public class StandardRandomWordClickImageCaptchaGenerator extends AbstractClickI
         resourceStore.addResource(CaptchaTypeConstant.WORD_IMAGE_CLICK, new Resource(ClassPathResourceProvider.NAME, StandardSliderImageCaptchaGenerator.DEFAULT_SLIDER_IMAGE_RESOURCE_PATH.concat("/1.jpg")));
     }
 
+    @SneakyThrows
     @Override
     public ImgWrapper genTipImage(List<ClickImageCheckDefinition> imageCheckDefinitions) {
         String tips = imageCheckDefinitions.stream().map(ClickImageCheckDefinition::getTip).collect(Collectors.joining());
         // 生成随机颜色
-        int fontWidth = metrics.stringWidth(tips);
+        int fontWidth = tips.length() * font.getSize();
-        int width = fontWidth + 5;
+        int width = fontWidth + 6;
-        int height = metrics.getHeight() + 5;
+        int height = font.getSize() + 6;
         float left = (width - fontWidth) / 2f;
-        float top = 5 / 2f + metrics.getAscent();
+        float top = 6 / 2f + font.getSize() - currentFontTopCoef;
         BufferedImage bufferedImage = CaptchaImageUtils.genSimpleImgCaptcha(tips,
-                font, metrics, width, height, left, top, tipImageInterferenceLineNum, tipImageInterferencePointNum);
+                font, width, height, left, top, tipImageInterferenceLineNum, tipImageInterferencePointNum);
+        FileOutputStream fileOutputStream = new FileOutputStream("d:/aaa/" + tips + ".png");
+        ImageIO.write(bufferedImage, "png", fileOutputStream);
+        fileOutputStream.close();
         return new ImgWrapper(bufferedImage, tips);
     }
 
+    @SneakyThrows
     @Override
     public ImgWrapper randomGetClickImg() {
         ThreadLocalRandom random = ThreadLocalRandom.current();
@@ -114,10 +128,13 @@ public class StandardRandomWordClickImageCaptchaGenerator extends AbstractClickI
         BufferedImage fontImage = CaptchaImageUtils.drawWordImg(randomColor,
                 randomWord,
                 font,
-                this.metrics,
+                currentFontTopCoef,
                 clickImgWidth,
                 clickImgHeight,
                 randomDeg);
+        FileOutputStream fileOutputStream = new FileOutputStream("d:/aaa/" + randomWord + ".png");
+        ImageIO.write(fontImage, "png", fileOutputStream);
+        fileOutputStream.close();
         return new ImgWrapper(fontImage, randomWord);
     }
 

src/main/test/java/example/StandardWordClickImageCaptchaGeneratorTest.java

@@ -1,6 +1,7 @@
 package example;
 
 import cloud.tianai.captcha.common.constant.CaptchaTypeConstant;
+import cloud.tianai.captcha.generator.ImageCaptchaGenerator;
 import cloud.tianai.captcha.generator.common.model.dto.GenerateParam;
 import cloud.tianai.captcha.generator.common.model.dto.ImageCaptchaInfo;
 import cloud.tianai.captcha.generator.impl.StandardRandomWordClickImageCaptchaGenerator;
@@ -15,8 +16,8 @@ public class StandardWordClickImageCaptchaGeneratorTest {
     public static void main(String[] args) {
         ImageCaptchaResourceManager imageCaptchaResourceManager = new DefaultImageCaptchaResourceManager();
 
-        StandardRandomWordClickImageCaptchaGenerator defaultImageCaptchaResourceManager =
+        ImageCaptchaGenerator defaultImageCaptchaResourceManager =
-                new StandardRandomWordClickImageCaptchaGenerator(imageCaptchaResourceManager, true);
+                new StandardRandomWordClickImageCaptchaGenerator(imageCaptchaResourceManager, true).init();
 
         GenerateParam generateParam = new GenerateParam();
         generateParam.setType(CaptchaTypeConstant.WORD_IMAGE_CLICK);