1 File转MultipartFile工具类
引入以下依赖：
<dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3.1</version> </dependency>
下面是具体代码：
package com.oldlu.file.excel.one; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.OutputStream; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.FileItemFactory; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.springframework.web.multipart.MultipartFile; import org.springframework.web.multipart.commons.CommonsMultipartFile; public class FileUtil { public MultipartFile fileToMultipartFile(File file) { FileItem fileItem = createFileItem(file); MultipartFile multipartFile = new CommonsMultipartFile(fileItem); return multipartFile; } private static FileItem createFileItem(File file) { FileItemFactory factory = new DiskFileItemFactory(16, null); FileItem item = factory.createItem("textField", "text/plain", true, file.getName()); int bytesRead = 0; byte[] buffer = new byte[8192]; try { FileInputStream fis = new FileInputStream(file); OutputStream os = item.getOutputStream(); while ((bytesRead = fis.read(buffer, 0, 8192)) != -1) { os.write(buffer, 0, bytesRead); } os.close(); fis.close(); } catch (IOException e) { e.printStackTrace(); } return item; } }
复制代码
注意：导入的是org.apache.commons下的包，一定记住，我踩过的雷。。。
2 MultipartFile转File
接受前端文件：
MultipartFile file111 = ((MultipartHttpServletRequest) httpServletRequest).getFile("前端传得文件名");
转换：
package com.oldlu.common.FileUtil;/** * Created by oldlu */ import org.springframework.web.multipart.MultipartFile; import java.io.File; import java.io.FileOutputStream; import java.io.InputStream; import java.io.OutputStream; /** * @ClassName MultipartFileToFile * @Description MultipartFile转fie * @Author oldlu **/ public class MultipartFileToFile { /** * MultipartFile 转 File * * @param file * @throws Exception */ public static File multipartFileToFile(MultipartFile file) throws Exception { File toFile = null; if (file.equals("") || file.getSize() <= 0) { file = null; } else { InputStream ins = null; ins = file.getInputStream(); toFile = new File(file.getOriginalFilename()); inputStreamToFile(ins, toFile); ins.close(); } return toFile; } //获取流文件 private static void inputStreamToFile(InputStream ins, File file) { try { OutputStream os = new FileOutputStream(file); int bytesRead = 0; byte[] buffer = new byte[8192]; while ((bytesRead = ins.read(buffer, 0, 8192)) != -1) { os.write(buffer, 0, bytesRead); } os.close(); ins.close(); } catch (Exception e) { e.printStackTrace(); } } /** * 删除本地临时文件 * @param file */ public static void delteTempFile(File file) { if (file != null) { File del = new File(file.toURI()); del.delete(); } } }
