MultipartFile和File互转

一、M转F

1.详细方法

/*** 将MultipartFile转换为File*** @param outFilePath 参数* @param multiFile 参数* @return 执行结果*/public static File multipartFileToFile(String outFilePath, MultipartFile multiFile) {// 获取文件名if (null == multiFile) {return null;}String fileName = multiFile.getOriginalFilename();if (null == fileName) {return null;}try {File toFile;InputStream ins;ins = multiFile.getInputStream();//指定存储路径toFile = new File(outFilePath.concat(File.separator).concat(multiFile.getOriginalFilename()));inputStreamToFile(ins, toFile);return toFile;} catch (Exception e) {e.printStackTrace();}return null;}private static void inputStreamToFile(InputStream ins, File file) {try (OutputStream os = new FileOutputStream(file)) {int bytesRead;int bytes = 8192;byte[] buffer = new byte[bytes];while ((bytesRead = ins.read(buffer, 0, bytes)) != -1) {os.write(buffer, 0, bytesRead);}ins.close();} catch (Exception e) {e.printStackTrace();}}

2.封装方法

File file = new File(path);
FileUtils.copyInputStreamToFile(multipartFile.getInputStream(), file);

3.其他方法

//创建file对象
File file = new File(path);
//将multipartFile转为file
multipartFile.transferTo(file);
return file;

二、F转M

/*** file转MultipartFile** @param file file* @return MultipartFile*/public static MultipartFile fileToMultipartFile(File file) {MultipartFile result = null;if (null != file) {try (FileInputStream input = new FileInputStream(file)) {result = new MockMultipartFile(file.getName().concat("temp"), file.getName(), "text/plain", input);} catch (IOException e) {e.printStackTrace();}}return result;}

三、其他的一些功能

package gov.cma.ew.qc.common.utils;import cn.hutool.core.text.CharSequenceUtil;
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 java.io.*;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;/*** file工具类** @author ldl*/
public class FileUtil {private FileUtil () {}/*** 获取** @param file new File(path) 目录* @return 返回值*/public static List<String> getDirectory(File file) {File[] fList = file.listFiles();if (fList == null || fList.length == 0) {return Collections.emptyList();}List<String> files = new ArrayList<>();for (File f : fList) {if (!f.isDirectory()) {//这里将列出所有的文件files.add(f.getAbsolutePath());}getDirectory(f);}return files;}/*** 将MultipartFile转换为File*** @param outFilePath 参数* @param multiFile 参数* @return 执行结果*/public static File multipartFileToFile(String outFilePath, MultipartFile multiFile) {// 获取文件名if (null == multiFile) {return null;}String fileName = multiFile.getOriginalFilename();if (null == fileName) {return null;}try {File toFile;InputStream ins;ins = multiFile.getInputStream();//指定存储路径toFile = new File(outFilePath.concat(File.separator).concat(multiFile.getOriginalFilename()));inputStreamToFile(ins, toFile);return toFile;} catch (Exception e) {e.printStackTrace();}return null;}private static void inputStreamToFile(InputStream ins, File file) {try (OutputStream os = new FileOutputStream(file)) {int bytesRead;int bytes = 8192;byte[] buffer = new byte[bytes];while ((bytesRead = ins.read(buffer, 0, bytes)) != -1) {os.write(buffer, 0, bytesRead);}ins.close();} catch (Exception e) {e.printStackTrace();}}public static FileItem createFileItem(String filePath, String fileName){String fieldName = "file";FileItemFactory factory = new DiskFileItemFactory(16, null);FileItem item = factory.createItem(fieldName, "text/plain", false,fileName);File newFile = new File(filePath);int bytesRead;int b = 8192;byte[] buffer = new byte[b];try (FileInputStream fis = new FileInputStream(newFile);OutputStream os = item.getOutputStream()) {while ((bytesRead = fis.read(buffer, 0, b)) != -1){os.write(buffer, 0, bytesRead);}} catch (IOException e) {e.printStackTrace();}return item;}/*** 读取文件内容** @return 文件内容*/public static String getFileContent(String filePath) {if (CharSequenceUtil.isBlank(filePath)) {return null;}File file = new File(filePath);StringBuilder sb = new StringBuilder();try (BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(file), StandardCharsets.UTF_8))) {//构造一个BufferedReader类来读取文件String str;while ((str = br.readLine()) != null) {//使用readLine方法，一次读一行sb.append(str);}} catch (Exception e) {e.printStackTrace();}return sb.toString();}}

最后奉上hutool 工具类包

<dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId>
</dependency>

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MultipartFile和File互转

一、M转F

二、F转M

三、其他的一些功能

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