文件下载第三种方式（压缩包里边还有文件夹）

/**

    *下载多个id下的多个文件（zip）

    */

  publicObject downloadByIds(HttpServletRequest req, HttpServletResponsersq,BeanContext bc){

      if(magazineIds.length>0){

         List<File> files= newArrayList<File>();

         List<FileList> fileLists= newArrayList<FileList>();

         FileList fileList = new FileList();

         String tempory_path = System.currentTimeMillis()+"";      

         for (int j = 0; j <magazineIds.length; j++) {

            List<FileList> lists= magazineSearchMagazineExt.findFileListById(magazineIds[j]);

            if(lists!=null){

                for(inti=0;i<lists.size();i++){

                    File file = new File("c:\\"+tempory_path+File.separator+lists.get(0).getDraftId()+File.separator+lists.get(i).getFileName()); 

                    if(!file.getParentFile().exists()){

                       file.getParentFile().mkdirs();

                    }

                    

                    try {

                      FileUtils.copyFile(new File(constantBean.propertiesMap.get("file_path")+File.separator+lists.get(i).getFilePath()),file);

                   }catch(IOException e) {

                      e.printStackTrace();

                   }

                }

     

            }else{

                message = "下载失败,稿件下没有文件!";

                return toDefault(req,rsq);

            }

         }

 

         try {

            ZipPath t = new ZipPath();

            t.zip("d:\\"+tempory_path+".zip","c:\\"+tempory_path);

             message = "下载成功!文件路径为:D盘下的"+tempory_path+".zip文件";

             return toDefault(req,rsq);

         } catch (Exception e) {

            e.printStackTrace();

            message = "下载失败!";

             return"maganize_show.jsp";

         }

       }

      message = "下载失败!";

       return"maganize_show.jsp";

    }

package com.allyroot.bjjoeocms.webapp.util;

 

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.InputStream;

import org.apache.tools.zip.ZipOutputStream;

import org.nestframework.commons.utils.StringUtil;

public classZipPath {

   static final int BUFFER = 2048000;// 200KB

 

   @SuppressWarnings("unchecked")

   public static void unzip(StringzipFileName, String outputDirectory)

    throws Exception {

      org.apache.tools.zip.ZipFilezipFile = new  org.apache.tools.zip.ZipFile(new File(zipFileName));

      java.util.Enumeratione = zipFile.getEntries();

      org.apache.tools.zip.ZipEntryz = null;

      InputStreamin = null;

         FileoutFile = newFile(outputDirectory);

         if (!outFile.exists())

         {

            outFile.mkdirs();

         }

         while (e.hasMoreElements()) {

            z= (org.apache.tools.zip.ZipEntry)e.nextElement();

            if (z.isDirectory()) {

                Stringname = z.getName();

                name= name.substring(0, name.length() - 1);

                Filef = newFile(outputDirectory + File.separator + name);

                f.mkdir();

            }else{

                Stringname = z.getName();

                int position =name.lastIndexOf("/");

                if (position >= 0)

                {

                   name= name.substring(position+1);

                }

                Filef = newFile(outputDirectory + File.separator

                      +name.toLowerCase());

               

                f.createNewFile();

                in= zipFile.getInputStream(z);

                FileOutputStreamout = newFileOutputStream(f);

                int count;

                byte[] data =new byte[BUFFER];

               

                while ((count = in.read(data,0,BUFFER))!= -1) {

                   out.write(data,0, count);

                }

                out.close();

            }

         }

         in.close();

         zipFile.close();

      }

 

   public void zip(String zipFileName,String inputFile) throws Exception {

      if (zipFileName ==null ||zipFileName.trim().length() == 0) {

         zipFileName= "test.zip";

      }

      zip(zipFileName,newFile(inputFile));

   }

 

   private void zip(String zipFileName,File inputFile) throwsException {

      ZipOutputStreamout = newZipOutputStream(newFileOutputStream(

            zipFileName));

      out.setMethod(ZipOutputStream.DEFLATED);

      // zip(out, inputFile, "test");//目录

      zip(out,inputFile, "");

      out.close();

   }

 

   private void zip(ZipOutputStreamout, File f, String base) throws Exception {

      if (f.isDirectory()) {

         File[]fl = f.listFiles();

         if (!StringUtil.isEmpty(base))

         {

            out.putNextEntry(neworg.apache.tools.zip.ZipEntry(base +"/"));

         }

         base= base.length() == 0 ? "" : base +"/";

         for (int i = 0; i < fl.length; i++) {

            StringfileName = fl[i].getName();

            int position =fileName.lastIndexOf(".");

            //扩展名

            StringextName = fileName.substring(position + 1);

            if ("zip".equals(extName))

            {

                continue;

            }

            zip(out,fl[i], base + fl[i].getName());

         }

      }else{

         out.putNextEntry(neworg.apache.tools.zip.ZipEntry(base));

         FileInputStreamin = newFileInputStream(f);

         int count;

         byte[] data =new byte[BUFFER];

         while ((count = in.read(data,0,BUFFER))!= -1) {

            out.write(data,0, count);

         }

         // int b;

         // while ((b = in.read()) != -1)

         // {

         // out.write(b);

         // }

         in.close();

        

      }

   }

}