codegen/templates/FilesUtil.java.j2

package {{ package.Common }}.unit;

import org.apache.commons.io.FileUtils;
import org.springframework.web.multipart.MultipartFile;
import sun.misc.BASE64Encoder;

import java.io.*;
import java.util.Base64;

public class FilesUtil {

    /**
     * 根据文件路径获取文件字节流
     * @return
     * filePath  文件路径
     * @throws IOException
     */
    public static byte[] toByteArray(String filePath) throws IOException {
        File f = new File(filePath);
        if (!f.exists()) {
            throw new FileNotFoundException("文件不存在");
        }

        ByteArrayOutputStream bos = new ByteArrayOutputStream((int) f.length());
        BufferedInputStream in = null;
        try {
            in = new BufferedInputStream(new FileInputStream(f));
            int buf_size = 1024;
            byte[] buffer = new byte[buf_size];
            int len = 0;
            while (-1 != (len = in.read(buffer, 0, buf_size))) {
                bos.write(buffer, 0, len);
            }
            return bos.toByteArray();
        } catch (IOException e) {
            e.printStackTrace();
            throw e;
        } finally {
            try {
                in.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            bos.close();
        }
    }
    public static File multipartFileToFile(MultipartFile file) throws Exception {
        File toFile = null;
        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();
        }
        return toFile;

    }



    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();
        }
    }

    public static String TransformPhotoToBase64Data(String path){
        Base64.Encoder encoder= Base64.getEncoder();  //获取Base64编码器
        byte [] ImgContainer = null ;    //数据集缓存器
        FileInputStream fileInputStream = null; //文件输入流
        try {
            System.out.println(path);
            File file=new File(path);
            fileInputStream = new FileInputStream(file);    //到指定路径寻找文件
            ImgContainer = new byte[fileInputStream.available()];          //设置图片字节数据缓冲区大小
            fileInputStream.read(ImgContainer);           //将数据流中的图片数据读进缓冲区
            String Base64ImgData =encoder.encodeToString(ImgContainer);  //将图片编码转换成Base64格式的数据集
            fileInputStream.close();      //关闭数据流
            return Base64ImgData;  //将缓冲区数据转换成字符数据返回
        } catch (FileNotFoundException e) {
            return "找不到指定文件!";
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "null";
    }

    public static String getBase64String(MultipartFile multiPartFile) throws IOException {
        String baseStr = null;

        //把MultipartFile转化为File
        File file = new File(multiPartFile.getOriginalFilename());
        FileUtils.copyInputStreamToFile(multiPartFile.getInputStream(), file);

        try {//file转base64
            FileInputStream inputStream = new FileInputStream(file);
            byte[] buffer = new byte[(int) file.length()];
            inputStream.read(buffer);
            inputStream.close();
            baseStr = new BASE64Encoder().encode(buffer);

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        //删除临时文件
        if (file.exists()) {
            file.delete();
        }
        baseStr = baseStr.replaceAll("\r\n", "");
        return baseStr;
    }

    /**
     * 返回文件扩展名，带。
     * @param file
     * @return
     */
    public static String getFileExtension(MultipartFile file) {
        String fileName = file.getOriginalFilename();
        int dotIndex = fileName.lastIndexOf(".");
        if (dotIndex == -1) {
            return "";
        } else {
            return "."+fileName.substring(dotIndex + 1);
        }
    }

}