最近有需求，要求從伺服器端下載多個檔案，並且下載的同時壓縮，上網查了半天沒有一個行的，最後還是想出下面的辦法，僅供參考

/**
	 * 壓縮下載的資料夾
	 * @param namelist 下載的檔案列表
	 * @param path 下載路徑
	 * @param zipname 壓縮檔名稱
	 */
	public void zipDownloadFile(HttpServletResponse response,List<String> namelist,String path,String zipname){
		byte[] buf = new byte[1024];
	
		try {
			
			// 本地儲存設定
			response.addHeader("Content-Disposition", "attachment; filename="
					+ URLEncoder.encode(zipname, sysEncoding)+".zip");
			
			response.setContentType("application/x-zip-compressed");
			
			// 向本地寫檔案
			ServletOutputStream sos=response.getOutputStream();
  
		    
		   ZipOutputStream zipOut  = new ZipOutputStream(new BufferedOutputStream(sos));  

		   
			for (String name : namelist) {
				
				    ZipEntry entry = new ZipEntry(name);  
				    zipOut.putNextEntry(entry);    
				    
				    InputStream bis = this.getStream(path, name);
				    if(bis!=null){
				    int readLen = -1;

				    while ((readLen = bis.read(buf, 0, 1024)) != -1) {
				    	zipOut.write(buf, 0, readLen);
	               }
	  
				    bis.close();    
				    }
			}
			
			zipOut.close(); 
		
			
		} catch (Exception e) {
		
			e.printStackTrace();
		}
		
	}