新增：新增获取图片验证码 API（引入 Redisson、Hutool、Easy Captcha 依赖，详情可见 README 介绍）

continew-admin-system/pom.xml

@@ -32,6 +32,12 @@ limitations under the License.
     <description>系统管理模块（存放系统管理模块相关功能，例如：部门管理、角色管理、用户管理等）</description>
 
     <dependencies>
+        <!-- Easy Captcha（Java 图形验证码，支持 gif、中文、算术等类型，可用于 Java Web、JavaSE 等项目） -->
+        <dependency>
+            <groupId>com.github.whvcse</groupId>
+            <artifactId>easy-captcha</artifactId>
+        </dependency>
+
         <!-- 公共模块（存放公共工具类，公共配置等） -->
         <dependency>
             <groupId>top.charles7c</groupId>

continew-admin-system/src/main/java/top/charles7c/cnadmin/auth/config/properties/CaptchaProperties.java

@@ -0,0 +1,136 @@
+/*
+ * Copyright (c) 2022-present Charles7c Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package top.charles7c.cnadmin.auth.config.properties;
+
+import java.awt.*;
+
+import lombok.Data;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.stereotype.Component;
+
+import com.wf.captcha.*;
+import com.wf.captcha.base.Captcha;
+
+import cn.hutool.core.util.ReflectUtil;
+import cn.hutool.core.util.StrUtil;
+
+/**
+ * 验证码配置属性
+ *
+ * @author Charles7c
+ * @since 2022/12/11 13:35
+ */
+@Data
+@Component
+@ConfigurationProperties(prefix = "captcha")
+public class CaptchaProperties {
+
+    /**
+     * 类型
+     */
+    private CaptchaTypeEnum type;
+
+    /**
+     * 缓存键的前缀
+     */
+    private String keyPrefix;
+
+    /**
+     * 过期时间
+     */
+    private Long expirationInMinutes = 2L;
+
+    /**
+     * 内容长度
+     */
+    private int length = 4;
+
+    /**
+     * 宽度
+     */
+    private int width = 111;
+
+    /**
+     * 高度
+     */
+    private int height = 36;
+
+    /**
+     * 字体
+     */
+    private String fontName;
+
+    /**
+     * 字体大小
+     */
+    private int fontSize = 25;
+
+    /**
+     * 获取验证码对象
+     *
+     * @return 验证码对象
+     */
+    public Captcha getCaptcha() {
+        Captcha captcha = ReflectUtil.newInstance(type.getClazz(), this.width, this.height);
+        captcha.setLen(length);
+        if (StrUtil.isNotBlank(this.fontName)) {
+            captcha.setFont(new Font(this.fontName, Font.PLAIN, this.fontSize));
+        }
+        return captcha;
+    }
+
+    /**
+     * 验证码类型枚举
+     */
+    @Getter
+    @RequiredArgsConstructor
+    public enum CaptchaTypeEnum {
+
+        /**
+         * 算术
+         */
+        ARITHMETIC(ArithmeticCaptcha.class),
+
+        /**
+         * 中文
+         */
+        CHINESE(ChineseCaptcha.class),
+
+        /**
+         * 中文闪图
+         */
+        CHINESE_GIF(ChineseGifCaptcha.class),
+
+        /**
+         * 闪图
+         */
+        GIF(GifCaptcha.class),
+
+        /**
+         * 特殊类型
+         */
+        SPEC(SpecCaptcha.class),;
+
+        /**
+         * 验证码字节码类型
+         */
+        private final Class<? extends Captcha> clazz;
+    }
+}

continew-admin-system/src/main/java/top/charles7c/cnadmin/auth/model/vo/CaptchaVO.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2022-present Charles7c Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package top.charles7c.cnadmin.auth.model.vo;
+
+import java.io.Serializable;
+
+import lombok.Data;
+import lombok.experimental.Accessors;
+
+/**
+ * 验证码信息
+ *
+ * @author Charles7c
+ * @since 2022/12/11 13:55
+ */
+@Data
+@Accessors(chain = true)
+public class CaptchaVO implements Serializable {
+
+    private static final long serialVersionUID = 1L;
+
+    /**
+     * 验证码唯一标识
+     */
+    private String uuid;
+
+    /**
+     * 验证码图片（Base64编码，带图片格式：data:image/gif;base64）
+     */
+    private String img;
+}