java 文件下载 【学习记录】

工具类 

public static Boolean downloadExcelFile(HttpServletResponse response, String fileName) {
		OutputStream output;
		File file = new File(fileName);
		if (file.exists()) {
			try {
				FileInputStream fileInputStream = new FileInputStream(file);
				BufferedInputStream bufferedInputStream = new BufferedInputStream(
						fileInputStream);
				byte[] b = new byte[bufferedInputStream.available()];
				bufferedInputStream.read(b);
				output = response.getOutputStream();
				response.setHeader("Content-disposition","attachment; filename=" + DateUtil.getCurrentDate("yyyyMMddHHmmss") +new String("模板文件".getBytes("UTF-8"), "ISO8859-1")+ ".xls");
				response.setContentType("application/msexcel");
				output.write(b);
				output.flush();
				output.close();
				return true;
			} catch (IOException e) {
				e.printStackTrace();
				return false;
			}
		}else {
			return false;
		}
		
	}

 

注意的地方：

文件下载的请求 不能使用 ajax  发送请求 ，否则不会弹出下载框，文件内容会 被全部响应到如图

可以使用 发送请求

location.href=""