MultipartFile和File互转

MultipartFile和File互转

一、M转F

详细方法

    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();        }    }

封装方法

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

其他方法

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

二、F转M

    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;public class FileUtil {    private FileUtil () {    }        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;    }        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;    }        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>

来源地址：https://blog.csdn.net/AA8310888193aaa/article/details/126856974