MultipartFile跟File互转
参考了一篇博客感觉很好用 所以这里就记录一下package com.ruoyi.constats.qiniu;import org.apache.commons.fileupload.FileItem;import org.apache.commons.fileupload.FileItemFactory;import org.apache.commons.fileupload.disk.Disk
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参考了一篇博客感觉很好用 所以这里就记录一下
package com.ruoyi.constats.qiniu;
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;
import java.io.*;
/**
* @author lsj
* @date 2020-12-29 10:16
*/
public class MultipartFileToFile
{
/**
* MultipartFile 转 File
*
* @param file
* @throws Exception
*/
public static File multipartFileToFile(MultipartFile file) {
File toFile = null;
try {
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();
}
}catch (Exception e)
{
e.printStackTrace();
}
return toFile;
}
public static MultipartFile FileToMultipartFile( File file )
{
try
{
FileItem fileItem = createFileItem(file.getPath());
MultipartFile multipartFile = new CommonsMultipartFile(fileItem);
return multipartFile;
}catch (Exception e)
{
e.printStackTrace();
}
return null;
}
private static FileItem createFileItem(String filePath)
{
FileItemFactory factory = new DiskFileItemFactory(16, null);
String textFieldName = "textField";
int num = filePath.lastIndexOf(".");
String extFile = filePath.substring(num);
FileItem item = factory.createItem(textFieldName, "text/plain", true,
filePath.substring(0,filePath.lastIndexOf(".")) + extFile);
File newfile = new File(filePath);
int bytesRead = 0;
byte[] buffer = new byte[8192];
try
{
FileInputStream fis = new FileInputStream(newfile);
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;
}
//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();
}
}
}
只做记录哦 又是记录的一天
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