Java 批量文件压缩导出并下载到本地示例代码

时间:2022-04-17 01:27:48

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