java 文件下载

后台：

/** *

 * @param fileId
 * @param request
 * @param response
 */
@RequestMapping(value = "/downFile", method = RequestMethod.GET, produces = "application/json;charset=UTF-8")
@ResponseBody
public void downFile(@RequestParam  String fileId,HttpServletRequest request, HttpServletResponse response) {

　　//查询文件实体信息
 //  Map<String,String>  map  =  jxhFileSerevice.queryFileById(fileId);

   String path = "E:\file\新框架文件.docx";
   File file = new File(path);
   String fileName = "新框架文件.docx";
   if (!file.exists()) {
      System.out.println("没有找到: " + path);
      return;
   }
   try {
      String head = new String(fileName.getBytes(), "iso-8859-1");
      response.setHeader("Content-Disposition", "attachment;filename=" + head);
      //输入流：本地文件路径
      FileInputStream in = new FileInputStream(file);
      //输出流
      OutputStream out = response.getOutputStream();
      //输出文件
      int bytes = 0;
      byte[] bufferOut = new byte[1024];
      while ((bytes = in.read(bufferOut)) != -1) {
         out.write(bufferOut, 0, bytes);
      }
      out.close();
      in.close();
   } catch (FileNotFoundException e) {
      e.printStackTrace();
   } catch (IOException e) {
      e.printStackTrace();
   }
}


前端js

/** 下载文件 */
function dowmloadFile(fileId){
    window.location.href='jxh/inner/serApiApply/downFile?fileId='+fileId;
    //window.location.href ="/visits/dowLoadFileToPC?fileId="+obj;
}