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java打包下载需用用到IO 打包流：ZipOutputStream

TXT 文件打包下载：

用到ZipOutputStream zip输出流，InputStream 字节输入流

BufferedInputStream,BufferedOutputStream 缓冲输入输出流

//打包下载
public void bookPackage(OutputStream outputStream,String bookIds,String bookname,String authorname){
    ZipOutputStream  out = new ZipOutputStream(outputStream); //创建zip输出流
    try {
        List<Integer> ids=null;
        if(bookIds!=null&&!bookIds.equals("")){
            ids =Arrays.stream(bookIds.split(",")).map(s->Integer.parseInt(s.trim())).collect(Collectors.toList());
        }
        List<Book> books = bookMapper.txtPackage(ids, bookname, authorname);
        for(Book book:books){
            String address = book.getDownload();
            if(address!=null){
                File f = new File(address);
                if(f.exists()){
                     out.putNextEntry(new ZipEntry(f.getName()));
                     InputStream input = new FileInputStream(f);
                     BufferedInputStream bis=new BufferedInputStream(input); //缓冲输入 (获取文件内容）
                     BufferedOutputStream bos = new BufferedOutputStream(out);    //缓冲输出 (输出到zip流里）
                     byte[] bytes=new byte[1024]; int len=-1;
                     while ((len=bis.read(bytes))!=-1){
                         bos.write(bytes,0,len);
                     }
                }
            }
        }
    } catch (IOException e) {
        e.printStackTrace();
    }finally{
        try{
           out.close();
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}

@ApiOperation(value="打包下载书籍")
@GetMapping("/downloadbookPL")
public void downloadbookPL(HttpServletRequest request, HttpServletResponse response,
                           String bookIds,
                           @ApiParam(value = "书名")@RequestParam(value="bookname",defaultValue = "")String bookname,
                           @ApiParam(value = "作者")@RequestParam(value="authorname",defaultValue = "")String authorname
                           ){
    response.setCharacterEncoding(request.getCharacterEncoding());
    InputStream inputStream = null;
    OutputStream outputStream = null;
    try {
        outputStream = response.getOutputStream();
        response.setContentType("application/x-download");//应用程序强制下载
        response.setHeader("Content-disposition", "attachment;filename=" + URLEncoder.encode("打包下载.zip", "UTF-8"));
        bookService.bookPackage(outputStream, bookIds,bookname,authorname);
        outputStream.flush();
        outputStream.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

Excel 打包下载：

使用到的流有ZipOutputStream zip输出流，内存输出流

public boolean excelPack(OutputStream outputStream){
    ZipOutputStream  out = new ZipOutputStream(outputStream); //创建zip输出流
    SXSSFWorkbook sxssfWorkbook=null;
    List<Book> bookList =bookService .selectAllExcel(null); //获取数据
    try {
        for (int i=1;i<5;i++){
            sxssfWorkbook = bookExcelS(bookList); //生成Excel
            if(sxssfWorkbook!=null){
                ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(); //内存输出流
                sxssfWorkbook.write(byteArrayOutputStream); //Excel 写入内存输出流
                out.putNextEntry(new ZipEntry(i + "."  + "清单"  + ".xlsx")); //添加zip
                out.write(byteArrayOutputStream.toByteArray()); //写入
            }
        }
    } catch (IOException e) {
        e.printStackTrace();
    }finally {
        if (out != null) {
            try { out.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    return true;
}