在SSM框架中，multfile转file

 import org.apache.commons.fileupload.disk.DiskFileItem;
 import org.springframework.web.multipart.MultipartFile;
 import org.springframework.web.multipart.commons.CommonsMultipartFile;

 import java.io.File;
 import java.io.IOException;

 public class MultipartToFile {
     /**
      * multfile转file
      * @param multfile
      * @return
      * @throws IOException
      */
     public static File multipartToFile(MultipartFile multfile) throws IOException {
         CommonsMultipartFile cf = (CommonsMultipartFile)multfile;
         //这个myfile是MultipartFile的
         DiskFileItem fi = (DiskFileItem) cf.getFileItem();
         File file = fi.getStoreLocation();
         //手动创建临时文件
         if(file.length() < 2048){//如果文件小于2M，创建临时文件
             File tmpFile = new File(System.getProperty("java.io.tmpdir") + System.getProperty("file.separator") +
                     file.getName());
             multfile.transferTo(tmpFile);
             return tmpFile;
         }
         return file;
     }

     /**
      * 获取文件名称，除去后缀名
      * @param filename
      * @return
      */
     public static String getFileNameNoEx(String filename) {
         if ((filename != null) && (filename.length() > 0)) {
             int dot = filename.lastIndexOf('.');
             if ((dot >-1) && (dot < (filename.length()))) {
                 return filename.substring(0, dot);
             }
         }
         return filename;
     }
 }