SpringMVC 下載

SpringMVC 下載

@RequestMapping(value = "/downDataPacket")
	public void downDataPacket(@RequestParam(value="sessionId", required=true) Long sessionId,HttpServletResponse response){
		log.debug("SessionAuditController--downDataPacket---sessionId:"+sessionId);
		
		String fileName="download-single.txt";
		if(null!=fileName&&(!"".equals(fileName))){
			log.debug("------start down file!!!-----");
			
			response.reset();// 不加這一句的話會出現下載錯誤
			response.setHeader("Content-disposition", "p_w_upload; filename="+fileName);// 設定輸出文件頭    
			response.setContentType("text/x-plain");// 定義輸出類型 
			ServletOutputStream out = null;
			FileInputStream fis = null;
			BufferedInputStream inputBufStream = null;
			BufferedOutputStream outputBufStream = null;
			try {
				out = response.getOutputStream();
				String path =  "D:\\down\\download-single.txt";
				fis = new java.io.FileInputStream(path);
				inputBufStream = new BufferedInputStream(fis);
				outputBufStream = new BufferedOutputStream(out);
				byte[] cache = new byte[2048];
				int offset = 0;
				while ((offset = inputBufStream.read(cache, 0, cache.length)) > 0) {
					outputBufStream.write(cache, 0, offset);
				}
				outputBufStream.flush();
				outputBufStream.close();
				inputBufStream.close();
				fis.close();
				out.close();
			} catch (Exception e) {
				e.printStackTrace();
				this.error("下載異常！");
				log.debug("------start down false!!!-----");
			}finally{
				try {
					if (out != null)
						out.close();
					if (outputBufStream != null)
						outputBufStream.close();
					if (inputBufStream != null)
						inputBufStream.close();
					if (fis != null)
						fis.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			this.info("下載成功！");
			log.debug("------start down success!!!-----");
		}
	}