增加图片验证码接口

src/main/java/cn/iocoder/dashboard/modules/system/controller/common/SysCaptchaController.http

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+### 请求 /captcha/get-image 接口 => 成功
+GET {{baseUrl}}/captcha/get-image

src/main/java/cn/iocoder/dashboard/modules/system/controller/common/SysCaptchaController.java

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+package cn.iocoder.dashboard.modules.system.controller.common;
+
+import cn.iocoder.dashboard.common.pojo.CommonResult;
+import cn.iocoder.dashboard.modules.system.controller.common.vo.SysCaptchaImageRespVO;
+import cn.iocoder.dashboard.modules.system.service.common.SysCaptchaService;
+import io.swagger.annotations.Api;
+import io.swagger.annotations.ApiOperation;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import javax.annotation.Resource;
+
+import static cn.iocoder.dashboard.common.pojo.CommonResult.success;
+
+@Api(tags = "验证码 API")
+@RestController
+@RequestMapping("/captcha")
+public class SysCaptchaController {
+
+    @Resource
+    private SysCaptchaService captchaService;
+
+    @ApiOperation("生成图片验证码")
+    @GetMapping("/get-image")
+    private CommonResult<SysCaptchaImageRespVO> getCaptchaImage() {
+        return success(captchaService.getCaptchaImage());
+    }
+
+}

src/main/java/cn/iocoder/dashboard/modules/system/controller/common/vo/SysCaptchaImageRespVO.java

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+package cn.iocoder.dashboard.modules.system.controller.common.vo;
+
+import io.swagger.annotations.ApiModel;
+import io.swagger.annotations.ApiModelProperty;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@ApiModel("验证码图片 Response VO")
+@Data
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class SysCaptchaImageRespVO {
+
+    @ApiModelProperty(value = "uuid", required = true, example = "1b3b7d00-83a8-4638-9e37-d67011855968", notes = "通过该 uuid 作为该验证码的标识")
+    private String uuid;
+
+    @ApiModelProperty(value = "图片", required = true, notes = "验证码的图片内容，使用 Base64 编码")
+    private String img;
+
+}