From 0187344798c2d4cb2a1b0d89a3e73dcc6bbb0a07 Mon Sep 17 00:00:00 2001
From: RuoYi <yzz_ivy@163.com>
Date: 星期日, 27 十二月 2020 10:04:45 +0800
Subject: [PATCH] Excel注解支持Image图片导出

---
 ruoyi-common/src/main/java/com/ruoyi/common/utils/file/FileTypeUtils.java |   29 +++++++++++++++++++++++++++++
 1 files changed, 29 insertions(+), 0 deletions(-)

diff --git a/ruoyi-common/src/main/java/com/ruoyi/common/utils/file/FileTypeUtils.java b/ruoyi-common/src/main/java/com/ruoyi/common/utils/file/FileTypeUtils.java
index 65be65b..25f5306 100644
--- a/ruoyi-common/src/main/java/com/ruoyi/common/utils/file/FileTypeUtils.java
+++ b/ruoyi-common/src/main/java/com/ruoyi/common/utils/file/FileTypeUtils.java
@@ -44,4 +44,33 @@
         }
         return fileName.substring(separatorIndex + 1).toLowerCase();
     }
+
+    /**
+     * 获取文件类型
+     * 
+     * @param photoByte 文件字节码
+     * @return 后缀(不含".")
+     */
+    public static String getFileExtendName(byte[] photoByte)
+    {
+        String strFileExtendName = "JPG";
+        if ((photoByte[0] == 71) && (photoByte[1] == 73) && (photoByte[2] == 70) && (photoByte[3] == 56)
+                && ((photoByte[4] == 55) || (photoByte[4] == 57)) && (photoByte[5] == 97))
+        {
+            strFileExtendName = "GIF";
+        }
+        else if ((photoByte[6] == 74) && (photoByte[7] == 70) && (photoByte[8] == 73) && (photoByte[9] == 70))
+        {
+            strFileExtendName = "JPG";
+        }
+        else if ((photoByte[0] == 66) && (photoByte[1] == 77))
+        {
+            strFileExtendName = "BMP";
+        }
+        else if ((photoByte[1] == 80) && (photoByte[2] == 78) && (photoByte[3] == 71))
+        {
+            strFileExtendName = "PNG";
+        }
+        return strFileExtendName;
+    }
 }
\ No newline at end of file

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