File工具类-蒲公英云

import sun.misc.BASE64Encoder;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
public class FileDownloadUtils {
    /**
     * 创建文件夹;
     *
     * @param path 路径
     */
    public static void createFile(String path) {
        File file = new File(path);
        //判断文件是否存在;
        if (!file.exists()) {
            //创建文件;
            file.mkdirs();
        }
    }
    /**
     * 将多个文件打包成fileName名称的zip文件，并存放到zipFilePath路径下
     * (把指定文件夹下的所有文件目录和文件都压缩到指定文件夹下)
     *
     * @param zipFilePath :压缩后存放路径
     * @param fileName    :压缩后文件的名称
     * @return boolean
     */
    public static boolean fileToZip(List<File> files, String zipFilePath, String fileName) {
        boolean flag = false;
        FileInputStream fis;
        BufferedInputStream bis = null;
        FileOutputStream fos;
        ZipOutputStream zos = null;
        try {
            File zipFile = new File(zipFilePath + "/" + fileName + ".zip");
            if (zipFile.exists()) {
                System.out.println(zipFilePath + "目录下存在名字为:" + fileName
                        + ".zip" + "的打包文件.");
            } else {
                if (!zipFile.exists()) {
                    zipFile.getParentFile().mkdirs();
                }
                fos = new FileOutputStream(zipFile);
                zos = new ZipOutputStream(new BufferedOutputStream(fos));
                byte[] bufs = new byte[1024 * 1024];
                for (int i = 0; i < files.size(); i++) {
                    try {
                        //创建ZIP实体，并添加进压缩包
                        ZipEntry zipEntry = new ZipEntry(String.valueOf(files.get(i)));
                        zos.putNextEntry(zipEntry);
                        // 读取待压缩的文件并写进压缩包里
                        fis = new FileInputStream(files.get(i));
                        bis = new BufferedInputStream(fis, 1024 * 1024);
                        int read;
                        while ((read = bis.read(bufs, 0, 1024 * 1024)) != -1) {
                            zos.write(bufs, 0, read);
                        }
                    } catch (Exception e) {
                        //logger.error("文件读取处理有误");
                        e.printStackTrace();
                    }
                }
                flag = true;
            }
        } catch (IOException e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        } finally {
            // 关闭流
            try {
                if (null != bis)
                    bis.close();
                if (null != zos)
                    zos.close();
            } catch (IOException e) {
                e.printStackTrace();
                throw new RuntimeException(e);
            }
        }
        return flag;
    }
    /**
     * 将批量文件打包下载成zip
     *
     * @param request  请求
     * @param response 返回
     * @param zipName  下载的zip名
     * @param files    要打包的批量文件
     * @param zipPath  生成的zip路径
     * @throws Exception 异常
     */
    public static void downloadZip(HttpServletRequest request, HttpServletResponse response, String zipName, List<File> files, String zipPath) throws Exception {
        File[] srcfile = new File[files.size()];
        File zip = new File(zipPath);
        for (int i = 0; i < files.size(); i++) {
            srcfile[i] = files.get(i);
        }
        //生成.zip文件;
        FileInputStream inStream = null;
        ServletOutputStream os = null;
        try {
            //设置下载zip的头信息
            FileDownloadUtils.setZipDownLoadHeadInfo(response, request, zipName);
            os = response.getOutputStream();
            //压缩文件
            FileDownloadUtils.ZipFiles(srcfile, zip);
            inStream = new FileInputStream(zip);
            byte[] buf = new byte[4096];
            int readLength;
            while (((readLength = inStream.read(buf)) != -1)) {
                os.write(buf, 0, readLength);
            }
        } finally {
            if (inStream != null) {
                inStream.close();
            }
            if (os != null) {
                os.flush();
                os.close();
            }
        }
    }
    /**
     * 设置下载zip的响应头信息
     *
     * @param response 返回
     * @param fileName 文件名
     * @param request  请求
     * @throws IOException 异常
     */
    public static void setZipDownLoadHeadInfo(HttpServletResponse response, HttpServletRequest request, String fileName) throws IOException {
        // 获取客户端浏览器的类型
        String agent = request.getHeader("User-Agent");
        response.setContentType("application/octet-stream ");
        // 表示不能用浏览器直接打开
        response.setHeader("Connection", "close");
        // 告诉客户端允许断点续传多线程连接下载
        response.setHeader("Accept-Ranges", "bytes");
        // 对文件名重新编码
        String encodingFileName = FileDownloadUtils.encodeDownloadFilename(fileName, agent);
        response.setHeader("Content-Disposition", "attachment; filename=" + encodingFileName);
    }
    /**
     * 编译下载的文件名
     *
     * @param filename 文件名
     * @param agent    浏览器
     * @return String
     * @throws IOException 异常
     */
    public static String encodeDownloadFilename(String filename, String agent) throws IOException {
        if (agent.contains("Firefox")) {
     // 火狐浏览器
            filename = "=?UTF-8?B?"
                    + new BASE64Encoder().encode(filename.getBytes("utf-8"))
                    + "?=";
            filename = filename.replaceAll("\r\n", "");
        } else {
     // IE及其他浏览器
            filename = URLEncoder.encode(filename, "utf-8");
            filename = filename.replace("+", " ");
        }
        return filename;
    }
    /**
     * //压缩文件
     *
     * @param srcfile 要压缩的文件数组
     * @param zipfile 生成的zip文件对象
     */
    public static void ZipFiles(java.io.File[] srcfile, File zipfile) throws Exception {
        byte[] buf = new byte[1024];
        FileOutputStream fos = new FileOutputStream(zipfile);
        ZipOutputStream out = new ZipOutputStream(fos);
        for (File file : srcfile) {
            FileInputStream in = new FileInputStream(file);
            out.putNextEntry(new ZipEntry(file.getName()));
            int len;
            while ((len = in.read(buf)) > 0) {
                out.write(buf, 0, len);
            }
            out.closeEntry();
            in.close();
        }
        out.close();
        fos.flush();
        fos.close();
    }
    /**
     * 删除文件夹及文件夹下所有文件
     *
     * @param dir 文件地址
     * @return boolean
     */
    public static boolean deleteDir(File dir) {
        if (dir == null || !dir.exists()) {
            return true;
        }
        if (dir.isDirectory()) {
            String[] children = dir.list();
            //递归删除目录中的子目录下
            for (String child : children) {
                boolean success = deleteDir(new File(dir, child));
                if (!success) {
                    return false;
                }
            }
        }
        // 目录此时为空，可以删除
        return dir.delete();
    }
}