Java如何把文件夹打成压缩包并导出

@Controller
public class AdminController {
    private String filePath = AdminController.class.getResource("/").getPath().split("WEB-INF")[0]+ "upload/";    
    @RequestMapping(value = "export_zip.htm", method = {RequestMethod.GET, RequestMethod.POST })
    public void zipwordDownAction(HttpServletRequest request,HttpServletResponse response) throws Exception {
        //打包文件的存放路径                     
        ZipCompressorByAnt zc = new  ZipCompressorByAnt(filePath+ "/file.zip");
        //需要打包的文件路径
        zc.compress(filePath+ "/file/");
        String contentType = "application/octet-stream";
        try {
            //导出压缩包
            download(request, response, "upload/file.zip", contentType,encodeChineseDownloadFileName(request, "file.zip"));
        } catch (Exception e) {
            request.getSession().setAttribute("msg", "暂无内容");
        }
        //如果原压缩包存在,则删除
        File file=new File(filePath+ "/file.zip");
        if(file.exists()){
            file.delete(); 
        }
    }   
    /** 
     * 下载文件  
     */  
    public static void download(HttpServletRequest request,HttpServletResponse response, String storeName, String contentType,String realName) throws Exception {
        response.setContentType("text/html;charset=UTF-8");
        request.setCharacterEncoding("UTF-8");
        BufferedInputStream bis = null;
        BufferedOutputStream bos = null;
        String ctxPath =FileUtil.class.getResource("/").getPath().split("WEB-INF")[0];
        String downLoadPath = ctxPath + storeName;
        long fileLength = new File(downLoadPath).length();
        response.setContentType(contentType);
        response.setHeader("Content-disposition", "attachment; filename="
                + new String(realName.getBytes("utf-8"), "ISO8859-1"));
        response.setHeader("Content-Length", String.valueOf(fileLength));
        bis = new BufferedInputStream(new FileInputStream(downLoadPath));
        bos = new BufferedOutputStream(response.getOutputStream());
        byte[] buff = new byte[2048];
        int bytesRead;
        while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
            bos.write(buff, 0, bytesRead);
        }
        bis.close();
        bos.close();
    }
    /** 
     * 对文件流输出下载的中文文件名进行编码 屏蔽各种浏览器版本的差异性  
     */  
    public static String encodeChineseDownloadFileName(HttpServletRequest request, String pFileName) throws UnsupportedEncodingException {  
         String filename = null;    
            String agent = request.getHeader("USER-AGENT");    
            if (null != agent){    
                if (-1 != agent.indexOf("Firefox")) {//Firefox    
                    filename = "=?UTF-8?B?" + (new String(org.apache.commons.codec.binary.Base64.encodeBase64(pFileName.getBytes("UTF-8"))))+ "?=";    
                }else if (-1 != agent.indexOf("Chrome")) {//Chrome    
                    filename = new String(pFileName.getBytes(), "ISO8859-1");    
                } else {//IE7+    
                    filename = java.net.URLEncoder.encode(pFileName, "UTF-8");    
                    filename = StringUtils.replace(filename, "+", "%20");//替换空格    
                }    
            } else {    
                filename = pFileName;    
            }    
            return filename;   
    }  

import java.io.File;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.taskdefs.Zip;
import org.apache.tools.ant.types.FileSet;
public class ZipCompressorByAnt {
    private File zipFile;  
    public ZipCompressorByAnt(String pathName) {  
        zipFile = new File(pathName);  
    }  
    public void compress(String srcPathName) {  
        File srcdir = new File(srcPathName);  
        if (!srcdir.exists())  
            throw new RuntimeException(srcPathName + "不存在！");  
        Project prj = new Project();  
        Zip zip = new Zip();      
        zip.setProject(prj);  
        zip.setDestFile(zipFile);  
        FileSet fileSet = new FileSet();  
        fileSet.setProject(prj);   
        fileSet.setDir(srcdir);  
        //fileSet.setIncludes("**/*.java"); 包括哪些文件或文件夹 eg:zip.setIncludes("*.java");  
        //fileSet.setExcludes(...); 排除哪些文件或文件夹  
        zip.addFileset(fileSet);            
        zip.execute();  
    }  
}

String downloadName = "下载文件名称.zip";
        downloadName = BrowserCharCodeUtils.browserCharCodeFun(request, downloadName);//下载文件名乱码问题解决
        
        //将文件进行打包下载
        try {
            OutputStream out = response.getOutputStream();
            byte[] data = createZip("/fileStorage/download");//服务器存储地址
            response.reset();
            response.setHeader("Content-Disposition","attachment;fileName="+downloadName);
            response.addHeader("Content-Length", ""+data.length);
            response.setContentType("application/octet-stream;charset=UTF-8");
            IOUtils.write(data, out);
            out.flush();
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

public byte[] createZip(String srcSource) throws Exception{
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        ZipOutputStream zip = new ZipOutputStream(outputStream);
        //将目标文件打包成zip导出
        File file = new File(srcSource); 
        a(zip,file,"");
        IOUtils.closeQuietly(zip);
        return outputStream.toByteArray();
    }

public void a(ZipOutputStream zip, File file, String dir) throws Exception {
            //如果当前的是文件夹，则进行进一步处理
            if (file.isDirectory()) {
                //得到文件列表信息
                File[] files = file.listFiles();
                //将文件夹添加到下一级打包目录
                zip.putNextEntry(new ZipEntry(dir + "/"));
                dir = dir.length() == 0 ? "" : dir + "/";
                //循环将文件夹中的文件打包
                for (int i = 0; i < files.length; i++) {
                    a(zip, files[i], dir + files[i].getName());         //递归处理
                }
            } else {   //当前的是文件，打包处理
                //文件输入流
               BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));
               ZipEntry entry = new ZipEntry(dir);
               zip.putNextEntry(entry);
               zip.write(FileUtils.readFileToByteArray(file));
               IOUtils.closeQuietly(bis);
               zip.flush();
               zip.closeEntry();
            }
    }