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);

									　　　}

									　　}