| 提交 | 用户 | 时间 | ||
| e57a89 | 1 | package com.jcdm.common.utils.file; |
| 懒 | 2 | |
| 3 | import java.io.File; | |
| 4 | import org.apache.commons.lang3.StringUtils; | |
| 5 | ||
| 6 | /** | |
| 7 | * 文件类型工具类 | |
| 8 | * | |
| 9 | * @author jc | |
| 10 | */ | |
| 11 | public class FileTypeUtils | |
| 12 | { | |
| 13 | /** | |
| 14 | * 获取文件类型 | |
| 15 | * <p> | |
| 16 | * 例如: jcdm.txt, 返回: txt | |
| 17 | * | |
| 18 | * @param file 文件名 | |
| 19 | * @return 后缀（不含".") | |
| 20 | */ | |
| 21 | public static String getFileType(File file) | |
| 22 | { | |
| 23 | if (null == file) | |
| 24 | { | |
| 25 | return StringUtils.EMPTY; | |
| 26 | } | |
| 27 | return getFileType(file.getName()); | |
| 28 | } | |
| 29 | ||
| 30 | /** | |
| 31 | * 获取文件类型 | |
| 32 | * <p> | |
| 33 | * 例如: jcdm.txt, 返回: txt | |
| 34 | * | |
| 35 | * @param fileName 文件名 | |
| 36 | * @return 后缀（不含".") | |
| 37 | */ | |
| 38 | public static String getFileType(String fileName) | |
| 39 | { | |
| 40 | int separatorIndex = fileName.lastIndexOf("."); | |
| 41 | if (separatorIndex < 0) | |
| 42 | { | |
| 43 | return ""; | |
| 44 | } | |
| 45 | return fileName.substring(separatorIndex + 1).toLowerCase(); | |
| 46 | } | |
| 47 | ||
| 48 | /** | |
| 49 | * 获取文件类型 | |
| 50 | * | |
| 51 | * @param photoByte 文件字节码 | |
| 52 | * @return 后缀（不含".") | |
| 53 | */ | |
| 54 | public static String getFileExtendName(byte[] photoByte) | |
| 55 | { | |
| 56 | String strFileExtendName = "JPG"; | |
| 57 | if ((photoByte[0] == 71) && (photoByte[1] == 73) && (photoByte[2] == 70) && (photoByte[3] == 56) | |
| 58 | && ((photoByte[4] == 55) || (photoByte[4] == 57)) && (photoByte[5] == 97)) | |
| 59 | { | |
| 60 | strFileExtendName = "GIF"; | |
| 61 | } | |
| 62 | else if ((photoByte[6] == 74) && (photoByte[7] == 70) && (photoByte[8] == 73) && (photoByte[9] == 70)) | |
| 63 | { | |
| 64 | strFileExtendName = "JPG"; | |
| 65 | } | |
| 66 | else if ((photoByte[0] == 66) && (photoByte[1] == 77)) | |
| 67 | { | |
| 68 | strFileExtendName = "BMP"; | |
| 69 | } | |
| 70 | else if ((photoByte[1] == 80) && (photoByte[2] == 78) && (photoByte[3] == 71)) | |
| 71 | { | |
| 72 | strFileExtendName = "PNG"; | |
| 73 | } | |
| 74 | return strFileExtendName; | |
| 75 | } | |
| 76 | } | |
