package com.lf.server.helper;
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import com.lf.server.entity.data.MetaFileEntity;
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import com.lf.server.service.data.UploaderService;
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import org.apache.commons.codec.digest.DigestUtils;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.text.DecimalFormat;
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import java.util.List;
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/**
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* 文件帮助类
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* @author WWW
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*/
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public class FileHelper {
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private final static String POINT = ".";
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public static final double D1024 = 1024.0;
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public static final double D1050 = 1050.0;
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private final static Log log = LogFactory.getLog(FileHelper.class);
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/**
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* 获取文件名
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* @param file
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* @return
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*/
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public static String getFileName(String file) {
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int idx = file.lastIndexOf(File.separator);
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if (idx > -1) {
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return file.substring(idx + 1);
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}
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return "";
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}
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/**
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* 获取文件扩展名
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*/
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public static String getExtension(File file) {
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if (file == null) {
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return null;
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}
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String fileName = file.getName().toLowerCase();
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int idx = fileName.lastIndexOf(POINT);
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if (idx == -1) {
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return "";
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}
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return fileName.substring(idx);
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}
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/**
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* 获取文件扩展名
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*/
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public static String getExtension(String fileName) {
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if (StringHelper.isEmpty(fileName)) {
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return "";
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}
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int idx = fileName.lastIndexOf(POINT);
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if (idx == -1) {
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return "";
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}
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return fileName.substring(idx).toLowerCase();
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}
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/**
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* 获取多用途互联网邮件扩展类型
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*
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* @param ext 文件扩展名
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* @return
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*/
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public static String getMime(String ext) {
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switch (ext) {
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// 图片
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case ".tif":
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case ".tiff":
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return "image/tiff";
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case ".img":
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return "application/x-img";
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case ".gif":
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return "image/gif";
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case ".jpg":
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case ".jpeg":
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return "image/jpeg";
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case ".png":
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return "image/png";
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// 音/视频
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case ".mp3":
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return "audio/mp3";
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case ".mp4":
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return "video/mpeg4";
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case ".avi":
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return "video/avi";
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case ".mpg":
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case ".mpeg":
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return "video/mpg";
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case ".wav":
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return "audio/wav";
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case ".wma":
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return "audio/x-ms-wma";
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case ".swf":
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return "application/x-shockwave-flash";
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case ".wmv":
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return "video/x-ms-wmv";
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case ".rm":
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return "application/vnd.rn-realmedia";
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case ".rmvb":
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return "application/vnd.rn-realmedia-vbr";
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// 网页
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case ".js":
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return "application/x-javascript";
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case ".css":
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return "text/css";
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case ".asp":
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return "text/asp";
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case ".mht":
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return "message/rfc822";
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case ".jsp":
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case ".htm":
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case ".html":
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case ".xhtml":
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return "text/html";
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case ".xml":
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case ".svg":
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return "text/xml";
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// 文件
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case ".txt":
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return "text/plain";
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case ".dbf":
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return "application/x-dbf";
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case ".mdb":
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return "application/msaccess";
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case ".pdf":
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return "application/pdf";
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case ".ppt":
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case ".pptx":
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return "application/x-ppt";
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case ".doc":
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case ".docx":
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return "application/msword";
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case ".xls":
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case ".xlsx":
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return "application/vnd.ms-excel";
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case ".dgn":
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return "application/x-dgn";
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case ".dwg":
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return "application/x-dwg";
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case ".ext":
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return "application/x-msdownload";
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// 默认
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default:
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return "application/octet-stream";
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}
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}
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/**
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* 字节单位换算
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*/
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public static String formatByte(long byteNumber) {
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double kbNumber = byteNumber / D1024;
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if (kbNumber < D1024) {
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return new DecimalFormat("#.##KB").format(kbNumber);
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}
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double mbNumber = kbNumber / D1024;
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if (mbNumber < D1024) {
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return new DecimalFormat("#.##MB").format(mbNumber);
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}
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double gbNumber = mbNumber / D1024;
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if (gbNumber < D1024) {
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return new DecimalFormat("#.##GB").format(gbNumber);
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}
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double tbNumber = gbNumber / D1024;
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return new DecimalFormat("#.##TB").format(tbNumber);
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}
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/**
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* byte转MB
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*/
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public static double sizeToMb(long size) {
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if (size < D1050) {
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return 0.001;
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}
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String str = String.format("%.3f", size / D1024 / D1024);
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return Double.parseDouble(str);
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}
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/**
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* 获取文件 MD5 码
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*/
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public static String getFileMd5(String filePath) throws IOException {
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FileInputStream fileStream = new FileInputStream(filePath);
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String md5 = DigestUtils.md5Hex(fileStream);
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fileStream.close();
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return md5;
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}
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/**
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* 删除文件
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*/
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public static void deleteFiles(List<MetaFileEntity> list) {
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try {
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for (MetaFileEntity mf : list) {
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File f = new File(mf.getPath());
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if (f.exists()) {
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f.delete();
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}
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}
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} catch (Exception ex) {
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log.error(ex.getMessage(), ex);
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}
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}
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}
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