java下载（模板以及文件等）

Controller层方法

/**
 * 模板下载
 * @param
 * @author kaima2
 */
@RequestMapping(value = "/downloadExcel", method = RequestMethod.GET)
@ResponseBody
public void downloadExcel(HttpServletRequest request,HttpServletResponse response) throws IOException {
 InputStream is= this.getClass().getResourceAsStream("/excelmodel/importNewsModel.xlsx");
 byte[] fileData = input2byte(is);
 downloadFile(response, request, "importNewsModel.xlsx", fileData);

}

input2byte方法

/**
 * inputstream转Byte[]
 * @param inStream
 * @return
 * @throws IOException
 */
private byte[] input2byte(InputStream inStream)
 throws IOException {
 ByteArrayOutputStream swapStream = new ByteArrayOutputStream();
 byte[] buff = new byte[100];
 int rc = 0;
 while ((rc = inStream.read(buff, 0, 100)) > 0) {
 swapStream.write(buff, 0, rc);
 }
 byte[] in2b = swapStream.toByteArray();
 return in2b;
}

downloadFile方法

/**
 * 下载
 * @param response
 * @param request
 * @param filename
 * @param fileData
 * @return
 */
private boolean downloadFile(HttpServletResponse response,
 HttpServletRequest request, String filename, byte[] fileData) {
 try {
 OutputStream myout = null;
 // 检查时候获取到数据
 if (fileData == null) {
 response.sendError(HttpStatus.SC_NOT_FOUND);
 return false;
 }
 try {
 if(request.getHeader("User-Agent").toUpperCase().indexOf("MSIE") > 0) {
 filename = new String(filename.getBytes("GBK"),"iso-8859-1");
 }else{
 filename = URLEncoder.encode(filename, "utf-8");
 }
 response.setContentType("multipart/form-data");
 /*response.setContentType("multipart/form-data;charset=utf-8");*/
 response.setHeader("content-disposition","attachment;filename="+filename);
 // 写明要下载的文件的大小
 response.setContentLength(fileData.length);
 // 从response对象中得到输出流,准备下载
 myout = response.getOutputStream();
 myout.write(fileData);
 myout.flush();
 } catch (Exception e) {
 } finally {
 if (myout != null) {
 try {
 myout.close();
 } catch (Exception e) {
 }
 }
 }
 } catch (IOException e) {
 return false;
 }
 return true;
}