import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.multipart.MultipartFile;

import java.io.*;

public class FileUtils {

    private static final Logger logger = LoggerFactory.getLogger(File.class);


    /**
     * 获得指定文件的byte数组
     */
    public static byte[] getBytes(String filePath) throws IOException {
        byte[] buffer = null;
        File file = new File(filePath);
        FileInputStream fis = new FileInputStream(file);
        try {
            ByteArrayOutputStream bos = new ByteArrayOutputStream(8192);
            byte[] b = new byte[8192];
            int n;
            while ((n = fis.read(b)) != -1) {
                bos.write(b, 0, n);
            }
            fis.close();
            bos.close();
            buffer = bos.toByteArray();
        } catch (FileNotFoundException e) {
            logger.error("文件工具类异常: 找不到文件",FileNotFoundException.class);
        } catch (IOException e) {
            logger.error("文件工具类异常: 找不到文件",IOException.class);
        } finally {
            fis.close();
        }
        return buffer;
    }

    /**
     * 根据byte数组，生成文件
     */
    public static void getFile(byte[] bfile, String filePath,String fileName) {
        BufferedOutputStream bos = null;
        FileOutputStream fos = null;
        File file = null;
        try {
            File dir = new File(filePath);
            if(!dir.exists()&&dir.isDirectory()){//判断文件目录是否存在
                dir.mkdirs();
            }
            file = new File(filePath+"\\"+fileName);
            fos = new FileOutputStream(file);
            bos = new BufferedOutputStream(fos);
            bos.write(bfile);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (bos != null) {
                try {
                    bos.close();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
            if (fos != null) {
                try {
                    fos.close();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
        }
    }

    /**
     * 清空文件夹内所有文件
     * @param path
     * @return
     */
    public static boolean delAllFile(String path) {
        boolean flag = false;
        File file = new File(path);
        if (!file.exists()) {
            return flag;
        }
        if (!file.isDirectory()) {
            return flag;
        }
        String[] tempList = file.list();
        File temp = null;
        for (int i = 0; i < tempList.length; i++) {
            if (path.endsWith(File.separator)) {
                temp = new File(path + tempList[i]);
            } else {
                temp = new File(path + File.separator + tempList[i]);
            }
            if (temp.isFile()) {
                temp.delete();
            }
            if (temp.isDirectory()) {
                delAllFile(path + "/" + tempList[i]);//先删除文件夹里面的文件
                flag = true;
            }
        }
        return flag;
    }

    /**
     * 返回后缀名包含.
     */
    public static String getSuffixName(MultipartFile file){
        String originalFilename = file.getOriginalFilename();
        return originalFilename.substring( originalFilename.lastIndexOf( "." ),originalFilename.length() );
    }

    /**
     * 返回文件名
     */
    public static String getFileName(MultipartFile file){
        String originalFilename = file.getOriginalFilename();
        return originalFilename.substring( 0, originalFilename.lastIndexOf( "." ));
    }
}