主要用的是org.apache.tools.zip.ZipOutputStream 这个zip流,这里以Execl为例子。
思路首先把zip流写入到http响应输出流中,再把excel的流写入zip流中(这里可以不用生成文件再打包,只需把execl模板读出写好数据输出到zip流中,并为每次的流设置文件名)
例如:在项目webapp下execl文件中 存在1.xls,2.xls,3.xls文件
1.Controller
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@RequestMapping (value = "/exportAll" ,method = RequestMethod.GET) public void exportAll() throws IOException{ try { HttpServletResponse response= this .getResponse(); response.setContentType( "application/octet-stream" ); String execlName = "报表" ; response.addHeader( "Content-Disposition" , "attachment;filename=" + new String(execlName.getBytes(), "iso-8859-1" ) + ".zip" ); OutputStream out = response.getOutputStream(); testService.exportAll(out); } catch (Exception e) { .... } } |
2.Service
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import java.io.OutputStream; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.tools.zip.ZipEntry; import org.apache.tools.zip.ZipOutputStream; import java.io.File; import java.io.FileInputStream; import javax.servlet.http.HttpServletRequest; import org.apache.poi.hssf.usermodel.HSSFCellStyle; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.poifs.filesystem.POIFSFileSystem; import org.springframework.web.context.request.RequestContextHolder; import org.springframework.web.context.request.ServletRequestAttributes; public boolean exportAll(OutputStream out){ ZipOutputStream zipStream = null ; HSSFWorkbook wb = null ; try { List<Test> datas = testService.getTestData(); zipStream = new ZipOutputStream(out); //这里是把zip流输出到httpresponse流中 for ( int i= 0 ;i< 3 ;i++){ wb = POIUtil.getWorkbook(i); //获取0,1,2.xls文件 HSSFSheet sheet = wb.getSheetAt( 0 ); testService.setSheet(sheet,datas); //...处理文件内容操作 ZipEntry zipEntry = new ZipEntry( new String( "文件名XXX" .getBytes(), "utf-8" )+ ".xls" ); //自己命名,这里假设是1,2,3 zipStream.putNextEntry(zipEntry); wb.write(zipStream); //这里就是循环每次把execl写入zip包中 zipStream.flush(); } } catch (Exception e) { throw new SysException(ERRORConstants.COMMON_SYSTEM_ERROR, e); } finally { try { if (wb!= null ){ wb.close(); } if (zipStream!= null ){ zipStream.close(); } out.flush(); out.close(); } catch (IOException e) { throw new SysException(ERRORConstants.COMMON_CLOSE_ERROR, e); } } } public static HSSFWorkbook getWorkbook(String bh){ try { String line = File.separator; ServletRequestAttributes aRequestAttributes=(ServletRequestAttributes)RequestContextHolder.getRequestAttributes(); HttpServletRequest request =aRequestAttributes== null ? null :aRequestAttributes.getRequest(); String webpath=request.getServletContext().getRealPath( "/" ); File file = new File(webpath+line+ "excel" +line+bh+ ".xls" ); POIFSFileSystem poifsFileSystem = new POIFSFileSystem( new FileInputStream(file)); HSSFWorkbook wb = new HSSFWorkbook(poifsFileSystem); return wb; } catch (Exception e) { throw new SysException(ERRORConstants.COMMON_SYSTEM_ERROR,e); } } |
最后的结果生成一个报表.zip,其中包含3个文件1.xls,2.xls,3.xls
总结
以上所述是小编给大家介绍的Java 批量文件压缩导出并下载到本地示例代码,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持!
原文链接:https://www.cnblogs.com/zwdx/archive/2017/12/26/8118379.html