import com.oreilly.servlet.multipart.FileRenamePolicy; //导入依赖的package包/类
/**
*/
  @Override
  /* TODO: ORID-1007 'File' this method should be supporting service */
  public File moveUploadFileTo(File destinationDir) {
      if (tempUploadFile != null && tempUploadFile.exists()) {
          destinationDir.mkdirs();
          // Check if such a file does already exist, if yes rename new file
          File existsFile = new File(destinationDir, uploadFilename);
          if (existsFile.exists()) {
              // Use standard rename policy
              FileRenamePolicy frp = new DefaultFileRenamePolicy();
              File tmpF = new File(uploadFilename);
              uploadFilename = frp.rename(tmpF).getName();
          }
          // Move file now
          File targetFile = new File(destinationDir, uploadFilename);
          if (FileUtils.copyFileToFile(tempUploadFile, targetFile, true)) {
              return targetFile;
          }
      }
      return null;
  }
 

import com.oreilly.servlet.multipart.FileRenamePolicy; //导入依赖的package包/类
/**
 * Pseudo-constructor that allows the class to perform any initialization necessary.
 *
 * @param request an HttpServletRequest that has a content-type of multipart.
 * @param tempDir a File representing the temporary directory that can be used to store
 *        file parts as they are uploaded if this is desirable
 * @param maxPostSize the size in bytes beyond which the request should not be read, and a
 *                    FileUploadLimitExceeded exception should be thrown
 * @throws IOException if a problem occurs processing the request of storing temporary
 *                     files
 * @throws FileUploadLimitExceededException if the POST content is longer than the
 *         maxPostSize supplied.
 */
public void build(HttpServletRequest request, final File tempDir, long maxPostSize)
        throws IOException, FileUploadLimitExceededException {

    try {
        // Create a new file in the temp directory in case of file name conflict
        FileRenamePolicy renamePolicy = new FileRenamePolicy() {
            public File rename(File arg0) {
                try {
                    return File.createTempFile("cos", "", tempDir);
                }
                catch (IOException e) {
                    throw new StripesRuntimeException(
                            "Caught an exception while trying to rename an uploaded file", e);
                }
            }
        };

        this.charset = request.getCharacterEncoding();
        this.multipart = new MultipartRequest(request,
                                              tempDir.getAbsolutePath(),
                                              (int) maxPostSize,
                                              this.charset,
                                              renamePolicy);
    }
    catch (IOException ioe) {
        Matcher matcher = EXCEPTION_PATTERN.matcher(ioe.getMessage());

        if (matcher.matches()) {
            throw new FileUploadLimitExceededException(Long.parseLong(matcher.group(2)),
                                                       Long.parseLong(matcher.group(1)));
        }
        else {
            throw ioe;
        }
    }
}
 

import com.oreilly.servlet.multipart.FileRenamePolicy; //导入依赖的package包/类
public String renameFileIfAlreadyExists() {
    // file already exists... upload anyway with new filename and
    // in the folder manager status.
    // rename file and ask user what to do
    FileRenamePolicy fileRenamePolicy = new DefaultFileRenamePolicy();
    if (!(getExistingVFSItem() instanceof LocalImpl)) {
        throw new AssertException("Can only LocalImpl VFS items, don't know what to do with file of type::" + getExistingVFSItem().getClass().getCanonicalName());
    }
    File existingFile = ((LocalImpl) getExistingVFSItem()).getBasefile();
    File tmpOrigFilename = new File(existingFile.getAbsolutePath());
    String renamedFilename = fileRenamePolicy.rename(tmpOrigFilename).getName();
    return renamedFilename;
}
 

import com.oreilly.servlet.multipart.FileRenamePolicy; //导入依赖的package包/类
public static void setFileRenamePolicy(FileRenamePolicy fileRenamePolicy) {
    MultipartRequest.fileRenamePolicy = fileRenamePolicy;
}