java文件压缩打包操作

import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;


public class DownToZipUtil {

   // 文件打包下载
   public static HttpServletResponse downLoadFiles(List files, HttpServletResponse response)
         throws Exception {
      try {
         
         File file = new File("abc.rar");
         if (!file.exists()) {
            file.createNewFile();
         }

         FileOutputStream fous = new FileOutputStream(file);

         ZipOutputStream zipOut = new ZipOutputStream(fous);

         zipFile(files, zipOut);
         zipOut.close();
         fous.close();
         return downloadZip(file, response);
      } catch (Exception e) {
         e.printStackTrace();
      }

      return response;
   }

   public static void zipFile(List files, ZipOutputStream outputStream) {
      int size = files.size();
      for (int i = 0; i < size; i++) {
         File file = (File) files.get(i);
         zipFile(file, outputStream);
      }
   }

   public static HttpServletResponse downloadZip(File file,
         HttpServletResponse response) {
      try {
         InputStream fis = new BufferedInputStream(new FileInputStream(
               file.getAbsolutePath()));
         byte[] buffer = new byte[fis.available()];
         fis.read(buffer);
         fis.close();
         response.reset();

         OutputStream toClient = new BufferedOutputStream(
               response.getOutputStream());
         response.setContentType("application/octet-stream");

         response.setHeader("Content-Disposition", "attachment;filename="
               + URLEncoder.encode(file.getName(), "UTF-8"));
         toClient.write(buffer);
         toClient.flush();
         toClient.close();
      } catch (IOException ex) {
         ex.printStackTrace();
      } finally {
         try {
            File f = new File(file.getAbsolutePath());
            f.delete();
         } catch (Exception e) {
            e.printStackTrace();
         }
      }
      return response;
   }

   public static void zipFile(File inputFile, ZipOutputStream ouputStream) {
      try {
         if (inputFile.exists()) {
            if (inputFile.isFile()) {
               FileInputStream IN = new FileInputStream(inputFile);
               BufferedInputStream bins = new BufferedInputStream(IN, 1024);
               ZipEntry entry = new ZipEntry(inputFile.getName());
               ouputStream.putNextEntry(entry);
               int nNumber;
               byte[] buffer = new byte[1024];
               while ((nNumber = bins.read(buffer)) != -1) {
                  ouputStream.write(buffer, 0, nNumber);
               }
               bins.close();
               IN.close();
            } else {
               try {
                  File[] files = inputFile.listFiles();
                  for (int i = 0; i < files.length; i++) {
                     zipFile(files[i], ouputStream);
                  }
               } catch (Exception e) {
                  e.printStackTrace();
               }
            }
         }
      } catch (Exception e) {
         e.printStackTrace();
      }
   }

}