File 轉 MultipartFile

引入以下依賴：

<dependency><groupId>commons-fileupload</groupId><artifactId>commons-fileupload</artifactId><version>1.3.1</version> </dependency>

下面是具體代碼：

package com.leiyuke.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;}}

總結

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