From 5d7b65670282a4fad015e37d567cfa171b162052 Mon Sep 17 00:00:00 2001
From: huliguo <2023611923@qq.com>
Date: 星期二, 20 五月 2025 12:25:19 +0800
Subject: [PATCH] 基础代码
---
pt-common/src/main/java/com/ruoyi/common/utils/file/FileTypeUtils.java | 76 ++++++++++++++++++++++++++++++++++++++
1 files changed, 76 insertions(+), 0 deletions(-)
diff --git a/pt-common/src/main/java/com/ruoyi/common/utils/file/FileTypeUtils.java b/pt-common/src/main/java/com/ruoyi/common/utils/file/FileTypeUtils.java
new file mode 100644
index 0000000..68130b9
--- /dev/null
+++ b/pt-common/src/main/java/com/ruoyi/common/utils/file/FileTypeUtils.java
@@ -0,0 +1,76 @@
+package com.ruoyi.common.utils.file;
+
+import java.io.File;
+import org.apache.commons.lang3.StringUtils;
+
+/**
+ * 文件类型工具类
+ *
+ * @author ruoyi
+ */
+public class FileTypeUtils
+{
+ /**
+ * 获取文件类型
+ * <p>
+ * 例如: ruoyi.txt, 返回: txt
+ *
+ * @param file 文件名
+ * @return 后缀（不含".")
+ */
+ public static String getFileType(File file)
+ {
+ if (null == file)
+ {
+ return StringUtils.EMPTY;
+ }
+ return getFileType(file.getName());
+ }
+
+ /**
+ * 获取文件类型
+ * <p>
+ * 例如: ruoyi.txt, 返回: txt
+ *
+ * @param fileName 文件名
+ * @return 后缀（不含".")
+ */
+ public static String getFileType(String fileName)
+ {
+ int separatorIndex = fileName.lastIndexOf(".");
+ if (separatorIndex < 0)
+ {
+ return "";
+ }
+ 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;
+ }
+}
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