Java 批量文件压缩导出并下载到本地示例代码

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

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网站的支持！

来源：https://www.cnblogs.com/zwdx/archive/2017/12/26/8118379.html