Java 批量文件压缩导出并下载到本地示例代码

时间:2021-05-20

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

@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

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

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