java 文件压缩和下载

压缩代码：

public class FileZipUtil {        /**      * @description:将文件/文件夹生成指定格式的压缩文件     * @autor:ym10159     * @date:2017年12月22日 上午9:53:13     * @param srcPath 源文件路径     * @param targetPath 压缩文件保存路径      */      public static void compressedFile(String srcPath, String targetPath, String zipFileName){          File srcFile = new File(srcPath);        File targetFile = new File(targetPath);         //压缩目录不存在，则创建        if (targetFile.isDirectory() && !targetFile.exists()) {          targetFile.mkdirs();          }          FileOutputStream fos = null;        ZipOutputStream zos = null;try {fos = new FileOutputStream(targetPath + File.separator + zipFileName);zos = new ZipOutputStream(new BufferedOutputStream(fos));  compress(zos, srcFile, ""); } catch (Exception e) {e.printStackTrace();} finally {try {if(null != zos){zos.close();}if(null != fos){fos.close();}} catch (IOException e) {e.printStackTrace();}}     }        private static void compress(ZipOutputStream zos, File file, String baseDir) throws Exception {          if (file.isDirectory()) {          baseDir = file.getName() + File.separator;        compressDir(zos, file, baseDir);        } else if (file.isFile()){         compressFile(zos, file, baseDir);        }      }          private static void compressDir(ZipOutputStream zos, File file, String baseDir) throws Exception{     File[] files = file.listFiles();           for (int i = 0; i < files.length; i++) {           /**递归调用*/             compress(zos, files[i], baseDir);         }      }        private static void compressFile(ZipOutputStream zos, File file, String baseDir) throws Exception{    BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));      zos.putNextEntry(new ZipEntry(baseDir + file.getName()));      int len = 0;      byte[] buffer = new byte[1024];      while ((len = bis.read(buffer)) != -1) {      zos.write(buffer, 0, len);      }      bis.close();      }}  

注意点：

        1.流的关闭顺序，否则会报stream closed异常

        2.递归的调用

下载代码：

public void download(HttpServletRequest request, HttpServletResponse response) throws IOException{String zipDownloadPath = attachmentService.download(orderCodeList);File file = new File(zipDownloadPath);InputStream fis = new BufferedInputStream(new FileInputStream(file));byte[] buffer = new byte[fis.available()];fis.read(buffer);fis.close();response.reset();response.setCharacterEncoding("UTF-8");String filename = file.getName().replaceAll("\\s", "");filename = URLEncoder.encode(filename,"UTF-8");response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename));response.addHeader("Content-Length", "" + file.length());OutputStream toClient = new BufferedOutputStream(response.getOutputStream());response.setContentType("application/octet-stream");toClient.write(buffer);toClient.flush();toClient.close();}

注意点：

        1.下载弹出框的设置，

    response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename));

        2.在谷歌和火狐浏览器中，不能更改目录存放，火狐默认存放在桌面，谷歌默认存放在C:\Users\用户名\Downloads下。而QQ浏览器有更改目录的功能。至于在谷歌和火狐浏览器中，不能更改存放目录的原因暂时还未解决。有解决的人，记得告诉我答案。