图片按角度进行翻转

fastbee-common/pom.xml

@@ -211,6 +211,11 @@
             <groupId>org.mapstruct</groupId>
             <artifactId>mapstruct-processor</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-test</artifactId>
+        </dependency>
+
 
     </dependencies>
 

fastbee-common/src/main/java/com/fastbee/common/utils/RotateImageUtils.java

@@ -0,0 +1,70 @@
+package com.fastbee.common.utils;
+
+import java.awt.*;
+import java.awt.image.BufferedImage;
+
+/**
+ * 图片旋转类
+ */
+public class RotateImageUtils {
+
+    /**
+     * 对图片进行旋转
+     *
+     * @param src   被旋转图片
+     * @param angel 旋转角度
+     * @return 旋转后的图片
+     */
+    public static BufferedImage Rotate(Image src, int angel) {
+        int src_width = src.getWidth(null);
+        int src_height = src.getHeight(null);
+        // 计算旋转后图片的尺寸
+        Rectangle rect_des = calcRotatedSize(new Rectangle(new Dimension(
+                src_width, src_height)), angel);
+        BufferedImage res = null;
+        res = new BufferedImage(rect_des.width, rect_des.height,
+                BufferedImage.TYPE_INT_RGB);
+        Graphics2D g2 = res.createGraphics();
+        // 进行转换
+        g2.translate((rect_des.width - src_width) / 2,
+                (rect_des.height - src_height) / 2);
+        g2.rotate(Math.toRadians(angel), src_width / 2, src_height / 2);
+
+        g2.drawImage(src, null, null);
+        return res;
+    }
+
+    /**
+     * 计算旋转后的图片
+     *
+     * @param src   被旋转的图片
+     * @param angel 旋转角度
+     * @return 旋转后的图片
+     */
+    public static Rectangle calcRotatedSize(Rectangle src, int angel) {
+        // 如果旋转的角度大于90度做相应的转换
+        if (angel >= 90) {
+            if (angel / 90 % 2 == 1) {
+                int temp = src.height;
+                src.height = src.width;
+                src.width = temp;
+            }
+            angel = angel % 90;
+        }
+
+        double r = Math.sqrt(src.height * src.height + src.width * src.width) / 2;
+        double len = 2 * Math.sin(Math.toRadians(angel) / 2) * r;
+        double angel_alpha = (Math.PI - Math.toRadians(angel)) / 2;
+        double angel_dalta_width = Math.atan((double) src.height / src.width);
+        double angel_dalta_height = Math.atan((double) src.width / src.height);
+
+        int len_dalta_width = (int) (len * Math.cos(Math.PI - angel_alpha
+                - angel_dalta_width));
+        int len_dalta_height = (int) (len * Math.cos(Math.PI - angel_alpha
+                - angel_dalta_height));
+        int des_width = src.width + len_dalta_width * 2;
+        int des_height = src.height + len_dalta_height * 2;
+        return new Rectangle(new Dimension(des_width, des_height));
+    }
+
+}

fastbee-common/src/main/java/com/fastbee/common/utils/file/FileUploadUtils.java

@@ -1,10 +1,13 @@
 package com.fastbee.common.utils.file;
 
-import java.io.File;
-import java.io.IOException;
+import java.awt.image.BufferedImage;
+import java.io.*;
 import java.nio.file.Paths;
 import java.util.Objects;
+
+import com.fastbee.common.utils.RotateImageUtils;
 import org.apache.commons.io.FilenameUtils;
+import org.springframework.mock.web.MockMultipartFile;
 import org.springframework.web.multipart.MultipartFile;
 import com.fastbee.common.config.RuoYiConfig;
 import com.fastbee.common.constant.Constants;
@@ -15,6 +18,8 @@ import com.fastbee.common.utils.DateUtils;
 import com.fastbee.common.utils.StringUtils;
 import com.fastbee.common.utils.uuid.Seq;
 
+import javax.imageio.ImageIO;
+
 /**
  * 文件上传工具类
  *
@@ -66,6 +71,17 @@ public class FileUploadUtils
         }
     }
 
+    public static final String uploadByAngle(String baseDir, MultipartFile file,Integer angle) throws IOException {
+        BufferedImage src = ImageIO.read(file.getInputStream());
+        BufferedImage rotate = RotateImageUtils.Rotate(src, angle);
+        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
+        ImageIO.write(rotate, getExtension(file),byteArrayOutputStream);
+        InputStream input = new ByteArrayInputStream(byteArrayOutputStream.toByteArray());
+        MultipartFile multipartFile = new MockMultipartFile("file",file.getOriginalFilename(),"text/plain", input);
+        return upload(baseDir, multipartFile);
+    }
+
+
     /**
      * 根据文件路径上传
      *