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+package com.dayou.utils;
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+
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+import cn.hutool.core.date.DateUtil;
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+import cn.hutool.core.util.RandomUtil;
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+import com.dayou.exception.file.FileNameLengthLimitExceededException;
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+import com.dayou.exception.file.FileSizeLimitExceededException;
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+import com.dayou.exception.file.InvalidExtensionException;
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+import lombok.extern.slf4j.Slf4j;
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+import net.coobird.thumbnailator.Thumbnails;
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+import org.apache.commons.fileupload.FileItem;
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+import org.apache.commons.fileupload.FileItemFactory;
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+import org.apache.commons.fileupload.disk.DiskFileItemFactory;
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+import org.apache.commons.io.FilenameUtils;
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+import org.apache.commons.lang3.StringUtils;
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+import org.springframework.http.MediaType;
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+import org.springframework.web.multipart.MultipartFile;
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+import org.springframework.web.multipart.commons.CommonsMultipartFile;
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+
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+import javax.imageio.ImageIO;
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+import java.awt.image.BufferedImage;
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+import java.io.*;
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+import java.util.Date;
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+import java.util.Objects;
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+
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+/**
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+ * 文件上传工具类
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+ *
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+ * @author xysy
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+ */
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+@Slf4j
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+public class FileUploadUtils {
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+ // 图片默认缩放比率
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+ private static final double DEFAULT_SCALE = 0.7d;
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+ /**
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+ * 默认大小 50M
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+ */
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+ public static final long DEFAULT_MAX_SIZE = 50 * 1024 * 1024;
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+
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+ /**
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+ * 默认的文件名最大长度 100
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+ */
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+ public static final int DEFAULT_FILE_NAME_LENGTH = 100;
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+
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+ private static int counter = 0;
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+
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+ /**
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+ * 根据文件路径上传
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+ *
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+ * @param baseDir 相对应用的基目录
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+ * @param file 上传的文件
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+ * @return 文件名称
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+ * @throws IOException
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+ */
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+ public static final String upload(String baseDir, MultipartFile file) throws FileSizeLimitExceededException,
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+ FileNameLengthLimitExceededException,
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+ InvalidExtensionException, IOException {
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+ return upload(baseDir, file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION, null);
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+ }
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+
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+ /**
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+ * @param baseDir
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+ * @param file
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+ * @param assginName 自定义文件名 包含扩展名
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+ * @return
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+ * @throws FileSizeLimitExceededException
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+ * @throws FileNameLengthLimitExceededException
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+ * @throws InvalidExtensionException
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+ * @throws IOException
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+ */
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+ public static final String upload(String baseDir, MultipartFile file, String assginName) throws FileSizeLimitExceededException,
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+ FileNameLengthLimitExceededException,
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+ InvalidExtensionException, IOException {
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+ return upload(baseDir, file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION, assginName);
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+ }
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+
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+ /**
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+ * 文件上传
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+ *
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+ * @param baseDir 相对应用的基目录
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+ * @param file 上传的文件
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+ * @return 返回上传成功的文件名
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+ * @throws FileSizeLimitExceededException 如果超出最大大小
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+ * @throws FileNameLengthLimitExceededException 文件名太长
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+ * @throws IOException 比如读写文件出错时
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+ * @throws InvalidExtensionException 文件校验异常
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+ */
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+ public static final String upload(String baseDir, MultipartFile file, String[] allowedExtension, String assignName)
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+ throws FileSizeLimitExceededException, IOException, FileNameLengthLimitExceededException,
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+ InvalidExtensionException {
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+ int fileNamelength = file.getOriginalFilename().length();
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+ if (fileNamelength > FileUploadUtils.DEFAULT_FILE_NAME_LENGTH) {
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+ throw new FileNameLengthLimitExceededException(FileUploadUtils.DEFAULT_FILE_NAME_LENGTH);
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+ }
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+ assertAllowed(file, allowedExtension);
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+ String fileName = extractFilename(file, assignName);
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+ fileName = createDateIndexFileName(fileName);
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+ File desc = getAbsoluteFile(baseDir, fileName);
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+ try {
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+ BufferedImage bufferedImage = ImageIO.read(file.getInputStream()); // 通过MultipartFile得到InputStream
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+ // ,从而得到BufferedImage
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+ if (bufferedImage == null) {
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+ // 证明上传的文件不是图片,获取图片流失败,不进行下面的操作
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+ file.transferTo(desc);
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+ } else {
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+ //不能使用bufferedImage 否则会出现翻转
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+ Thumbnails.of(file.getInputStream())
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+ .scale(FileUploadUtils.DEFAULT_SCALE)
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+ .toFile(desc.getAbsolutePath());
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+ }
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+ // 省略逻辑判断
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+ } catch (Exception e) {
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+ // 省略异常操作
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+ log.error("图片压缩失败", e);
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+ file.transferTo(desc);
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+ }
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+ String pathFileName = fileName;
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+ return pathFileName;
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+
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+ }
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+
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+
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+ private static String createDateIndexFileName(String fileName) {
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+ Date now = new Date();
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+ String year = DateUtil.format(now, "yyyy");
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+ String month = DateUtil.format(now, "MM");
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+ String day = DateUtil.format(new Date(), "dd");
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+// String index =
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+// File.separator + year + File.separator + month + File.separator + day + File.separator + fileName;
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+ //能够兼容win 和linux
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+ String spliter = "/";
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+ String index = spliter + year + spliter + month + spliter + day + spliter + fileName;
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+ return index;
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+ }
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+
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+ /**
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+ * MultipartFile 转 File
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+ *
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+ * @param file
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+ * @throws Exception
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+ */
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+ public static File multipartFileToFile(MultipartFile file) throws Exception {
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+
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+ File toFile = null;
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+ if ("".equals(file) || file.getSize() <= 0) {
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+ file = null;
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+ } else {
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+ InputStream ins = null;
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+ ins = file.getInputStream();
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+ toFile = new File(RandomUtil.randomString(32) + file.getOriginalFilename());
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+ inputStreamToFile(ins, toFile);
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+ ins.close();
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+ }
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+ return toFile;
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+ }
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+
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+ //获取流文件
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+ private static void inputStreamToFile(InputStream ins, File file) {
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+ try {
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+ OutputStream os = new FileOutputStream(file);
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+ int bytesRead = 0;
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+ byte[] buffer = new byte[8192];
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+ while ((bytesRead = ins.read(buffer, 0, 8192)) != -1) {
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+ os.write(buffer, 0, bytesRead);
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+ }
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+ os.close();
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+ ins.close();
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+ } catch (Exception e) {
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+ e.printStackTrace();
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+ }
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+ }
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+
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+ /**
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+ * 删除本地临时文件
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+ *
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+ * @param file
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+ */
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+ public static void delteTempFile(File file) {
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+ if (file != null) {
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+ File del = new File(file.toURI());
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+ del.delete();
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+ }
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+ }
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+
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+ /**
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+ * 编码文件名
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+ */
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+ public static final String extractFilename(MultipartFile file, String assignName) {
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+ String fileName = file.getOriginalFilename();
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+ String extension = getExtension(file);
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+ fileName = Objects.nonNull(assignName) ? assignName : encodingFilename(fileName) + "-" + DateUtil.format(new Date(), "yyyyMMddHHmmssSSS") + "." + extension;
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+ return fileName;
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+ }
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+
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+ /**
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+ * 编码文件名
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+ */
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+ public static final String extractFilename(File file) {
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+ String fileName = file.getName();
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+ String extension = getExtension(file);
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+ fileName = DateUtil.format(new Date(), "yyyyMMddHHmmss") + "-" + encodingFilename(fileName) + "." + extension;
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+ return fileName;
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+ }
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+
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+ private static final String getPathFileName(String uploadDir, String fileName) throws IOException {
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+ int dirLastIndex = uploadDir.lastIndexOf("/") + 1;
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+ String currentDir = StringUtils.substring(uploadDir, dirLastIndex);
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+// String pathFileName = Constants.RESOURCE_PREFIX + "/" + currentDir + "/" + fileName;
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+ String pathFileName = currentDir + "/" + fileName;
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+ return pathFileName;
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+ }
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+
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+ private static final File getAbsoluteFile(String uploadDir, String fileName) throws IOException {
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+ File desc = new File(uploadDir + File.separator + fileName);
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+ // 高版本spring中CommonsMultipartFile会自动创建desc,如果创建会报错
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+ if (!desc.getParentFile().exists()) {
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+ desc.getParentFile().mkdirs();
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+ }
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+// if (!desc.exists())
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+// {
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+// desc.createNewFile();
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+// }
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+ return desc;
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+ }
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+
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+ public static boolean isImage(String extension) {
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+ String[] imageExtension = new String[]{"jpeg", "jpg", "gif", "bmp", "png"};
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+
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+ for (String e : imageExtension) if (extension.toLowerCase().equals(e)) return true;
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+
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+ return false;
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+ }
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+
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+ /**
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+ * 编码文件名
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+ */
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+ private static final String encodingFilename(String fileName) {
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+ fileName = fileName.replace("_", " ");
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+ fileName = Md5Utils.hash(fileName + System.nanoTime() + counter++);
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+ return fileName;
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+ }
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+
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+ /**
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+ * 文件大小校验
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+ *
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+ * @param file 上传的文件
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+ * @return
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+ * @throws FileSizeLimitExceededException 如果超出最大大小
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+ * @throws InvalidExtensionException
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+ */
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+ public static final void assertAllowed(MultipartFile file, String[] allowedExtension)
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+ throws FileSizeLimitExceededException, InvalidExtensionException {
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+ long size = file.getSize();
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+ if (DEFAULT_MAX_SIZE != -1 && size > DEFAULT_MAX_SIZE) {
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+ throw new FileSizeLimitExceededException(DEFAULT_MAX_SIZE / 1024 / 1024);
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+ }
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+ String fileName = file.getOriginalFilename();
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+ String extension = getExtension(file);
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+ if (allowedExtension != null && !isAllowedExtension(extension, allowedExtension)) {
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+ if (allowedExtension == MimeTypeUtils.IMAGE_EXTENSION) {
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+ throw new InvalidExtensionException.InvalidImageExtensionException(allowedExtension, extension,
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+ fileName);
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+ } else if (allowedExtension == MimeTypeUtils.FLASH_EXTENSION) {
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+ throw new InvalidExtensionException.InvalidFlashExtensionException(allowedExtension, extension,
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+ fileName);
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+ } else if (allowedExtension == MimeTypeUtils.MEDIA_EXTENSION) {
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+ throw new InvalidExtensionException.InvalidMediaExtensionException(allowedExtension, extension,
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+ fileName);
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+ } else {
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+ throw new InvalidExtensionException(allowedExtension, extension, fileName);
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+ }
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+ }
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+ }
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+
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+ /**
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+ * 判断MIME类型是否是允许的MIME类型
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+ *
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+ * @param extension
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+ * @param allowedExtension
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+ * @return
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+ */
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+ public static final boolean isAllowedExtension(String extension, String[] allowedExtension) {
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+ for (String str : allowedExtension) {
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+ if (str.equalsIgnoreCase(extension)) {
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+ return true;
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+ }
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+ }
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+ return false;
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+ }
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+
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+ /**
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+ * 获取文件名的后缀
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+ *
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+ * @param file 表单文件
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+ * @return 后缀名
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+ */
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+ public static final String getExtension(MultipartFile file) {
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+ String extension = FilenameUtils.getExtension(file.getOriginalFilename());
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+ if (StringUtils.isEmpty(extension)) {
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+ extension = MimeTypeUtils.getExtension(file.getContentType());
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+ }
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+ return extension;
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+ }
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+
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+ /**
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+ * 获取文件名的后缀
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+ *
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+ * @param file 表单文件
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+ * @return 后缀名
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+ */
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+ public static final String getExtension(File file) {
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+ String extension = FilenameUtils.getExtension(file.getName());
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+ return extension;
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+ }
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+
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+ /**
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+ * 获取封装得MultipartFile
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+ *
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+ * @param inputStream inputStream
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+ * @param fileName fileName
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+ * @return MultipartFile
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+ */
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+ public static MultipartFile getMultipartFile(InputStream inputStream, String fileName) {
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+ FileItem fileItem = createFileItem(inputStream, fileName);
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+ //CommonsMultipartFile是feign对multipartFile的封装,但是要FileItem类对象
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+ return new CommonsMultipartFile(fileItem);
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+ }
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+
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+
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+ /**
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+ * FileItem类对象创建
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+ *
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+ * @param inputStream inputStream
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+ * @param fileName fileName
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+ * @return FileItem
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+ */
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+ public static FileItem createFileItem(InputStream inputStream, String fileName) {
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+ FileItemFactory factory = new DiskFileItemFactory(16, null);
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+ String textFieldName = "file";
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+ FileItem item = factory.createItem(textFieldName, MediaType.MULTIPART_FORM_DATA_VALUE, true, fileName);
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+ int bytesRead = 0;
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+ byte[] buffer = new byte[10 * 1024 * 1024];
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+ OutputStream os = null;
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+ //使用输出流输出输入流的字节
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+ try {
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+ os = item.getOutputStream();
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+ while ((bytesRead = inputStream.read(buffer, 0, 8192)) != -1) {
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+ os.write(buffer, 0, bytesRead);
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+ }
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+ inputStream.close();
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+ } catch (IOException e) {
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+ log.error("Stream copy exception", e);
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+ throw new IllegalArgumentException("文件上传失败");
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+ } finally {
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+ if (os != null) {
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+ try {
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+ os.close();
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+ } catch (IOException e) {
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+ log.error("Stream close exception", e);
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+
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+ }
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+ }
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+ if (inputStream != null) {
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+ try {
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+ inputStream.close();
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+ } catch (IOException e) {
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+ log.error("Stream close exception", e);
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+ }
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+ }
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+ }
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+
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+ return item;
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+ }
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+
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+}
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