文件操作

public static String fileExtendName(String fileName) {
    if (StringUtils.isBlank(fileName)) {
        return null;
    }
    if (!fileName.contains(".")) {
        return null;
    }
    if (fileName.endsWith(".")) {
        return null;
    }
    int index = fileName.lastIndexOf(".");
    return fileName.substring(index + 1);
}

public static String simpleFileName(String fileName) {
    if (StringUtils.isBlank(fileName)) {
        return null;
    }
    if (!fileName.contains(".")) {
        return null;
    }
    if (fileName.endsWith(".")) {
        return null;
    }
    return fileName.substring(0, fileName.lastIndexOf("."));
}

import com.alibaba.fastjson.JSON;import lombok.extern.slf4j.Slf4j;
import okhttp3.Response;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;
import java.io.File;
import java.io.IOException;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.*;

/**
 * @Title: FileUtil
 * @Description: TODO
 * @Author: mxgu@iflytek.com
 * @Date: 2021-03-19 15:15:42
 */
@Slf4j
@Component
public class FileUtil extends FileUtils {


    /**
     * <功能描述:> 获取指定文件夹下的文件，支持可配置是否扫描其子文件夹下的文件
     *
     */
    public static List<File> getFileList(File file, boolean containsChildDir) {
        List<File> list = new ArrayList<>();
        if (!file.isDirectory()) {
            list.add(file);
            return list;
        }
        File[] childFileList = file.listFiles();
        for (File childFile : childFileList) {
            if (!childFile.isDirectory()) {
                list.add(childFile);
                continue;
            }
            if (containsChildDir) {
                list.addAll(getFileList(childFile, containsChildDir));
            }
        }
        return list;
    }

    /**
     * <功能描述:> 远程文件下载到本地
     */
    public static void downRemoteFile2Local(String remoteUrl,String localPath){
        String filePath = localPath.substring(0,localPath.lastIndexOf("/")+1);
        File file = new File(filePath);
        if(!file.exists()){
            file.mkdirs();
        }
        try (InputStream in = new URL(remoteUrl).openConnection().getInputStream();
             FileOutputStream out = new FileOutputStream(new File(localPath))) {
            IOUtils.copy(in,out);
        } catch (Exception e) {
            log.error("远程文件下载到本地失败，远程地址：{}，失败原因：{}",remoteUrl,e);
            throw new RuntimeException("远程文件下载到本地失败",e);
        }
    }


    public static boolean deleteAllDirAndFile(String delpath) {
        try {
            File file = new File(delpath);
            if (!file.exists()) {
                return true;
            }
            if (!file.isDirectory()) {
                boolean delFlag = file.delete();
                if (!delFlag) {
                    log.warn("文件删除失败!");
                }
            } else if (file.isDirectory()) {
                String[] filelist = file.list();
                for (int i = 0; i < filelist.length; i++) {
                    File delfile = new File(delpath + File.separator + filelist[i]);
                    if (!delfile.isDirectory()) {
                        boolean delFlag = delfile.delete();
                        if (!delFlag) {
                            log.warn("文件删除失败!");
                        }
                    } else if (delfile.isDirectory()) {
                        deleteAllDirAndFile(delpath + File.separator + filelist[i]);
                    }
                }
                boolean dirDelFlag = file.delete();
                if (!dirDelFlag) {
                    log.warn("目录删除失败!");
                }
            }
            return true;
        } catch (Exception e) {
            log.error(String.format("删除[%s]路径下的文件及文件夹失败!", delpath), e);
        }
        return false;
    }
}