package com.chinaztt.mes.common.util;

import org.springframework.web.multipart.MultipartFile;

import java.io.*;
import java.util.Objects;

/**
 * @Author 张宾
 * @Date 2022/8/5
 */
public class MultipartFileToFile {
    /**
     * MultipartFile 转 File
     *
     * @param file
     * @throws Exception
     */
    public static File multipartFileToFile(MultipartFile file) {

        File toFile = null;
        try {
			if ("".equals(file) || file.getSize() <= 0) {
				file = null;
			} else {
				InputStream ins = null;
				ins = file.getInputStream();
				toFile = new File(Objects.requireNonNull(file.getOriginalFilename()));
				inputStreamToFile(ins, toFile);
				ins.close();
			}
		}catch (IOException e){
			e.printStackTrace();
		}
        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.deleteOnExit();
        }
    }

}