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76 lines
2.0 KiB
76 lines
2.0 KiB
package com.ruoyi.common.utils.file; |
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import java.io.File; |
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import org.apache.commons.lang3.StringUtils; |
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/** |
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* 文件类型工具类 |
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* |
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* @author ruoyi |
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*/ |
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public class FileTypeUtils |
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{ |
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/** |
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* 获取文件类型 |
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* <p> |
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* 例如: ruoyi.txt, 返回: txt |
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* |
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* @param file 文件名 |
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* @return 后缀（不含".") |
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*/ |
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public static String getFileType(File file) |
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{ |
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if (null == file) |
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{ |
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return StringUtils.EMPTY; |
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} |
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return getFileType(file.getName()); |
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} |
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/** |
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* 获取文件类型 |
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* <p> |
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* 例如: ruoyi.txt, 返回: txt |
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* |
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* @param fileName 文件名 |
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* @return 后缀（不含".") |
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*/ |
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public static String getFileType(String fileName) |
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{ |
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int separatorIndex = fileName.lastIndexOf("."); |
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if (separatorIndex < 0) |
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{ |
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return ""; |
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} |
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return fileName.substring(separatorIndex + 1).toLowerCase(); |
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} |
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/** |
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* 获取文件类型 |
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* |
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* @param photoByte 文件字节码 |
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* @return 后缀（不含".") |
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*/ |
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public static String getFileExtendName(byte[] photoByte) |
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{ |
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String strFileExtendName = "JPG"; |
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if ((photoByte[0] == 71) && (photoByte[1] == 73) && (photoByte[2] == 70) && (photoByte[3] == 56) |
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&& ((photoByte[4] == 55) || (photoByte[4] == 57)) && (photoByte[5] == 97)) |
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{ |
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strFileExtendName = "GIF"; |
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} |
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else if ((photoByte[6] == 74) && (photoByte[7] == 70) && (photoByte[8] == 73) && (photoByte[9] == 70)) |
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{ |
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strFileExtendName = "JPG"; |
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} |
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else if ((photoByte[0] == 66) && (photoByte[1] == 77)) |
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{ |
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strFileExtendName = "BMP"; |
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} |
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else if ((photoByte[1] == 80) && (photoByte[2] == 78) && (photoByte[3] == 71)) |
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{ |
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strFileExtendName = "PNG"; |
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} |
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return strFileExtendName; |
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} |
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} |