Java实现下载自动生成的Excel文件到本地

 public String downLoadExcelModel() throws Exception {
       String path = excelDownLoadPath;
       String fileName =ListInfo[ListInfo.length-1];
       String filePath = path;
       this.downLoadFile(filePath, response, fileName, "xls");
       return null;
     }
 public static boolean downLoadFile(String filePath,
        HttpServletResponse response, String fileName, String fileType)
        throws Exception {
        File file = new File(filePath);  //根据文件路径获得File文件
        //设置文件类型(这样设置就不止是下Excel文件了，一举多得)
        if("pdf".equals(fileType)){
           response.setContentType("application/pdf;charset=GBK");
        }else if("xls".equals(fileType)){
           response.setContentType("application/msexcel;charset=GBK");
        }else if("doc".equals(fileType)){
           response.setContentType("application/msword;charset=GBK");
        }
        //文件名
        response.setHeader("Content-Disposition", "attachment;filename=\""
            + new String(fileName.getBytes(), "ISO8859-1") + "\"");
        response.setContentLength((int) file.length());
        byte[] buffer = new byte[4096];// 缓冲区
        BufferedOutputStream output = null;
        BufferedInputStream input = null;
        try {
          output = new BufferedOutputStream(response.getOutputStream());
          input = new BufferedInputStream(new FileInputStream(file));
          int n = -1;