SpringMVC实现文件下载功能（文件导出功能）-蒲公英云

SpringMVC实现文件下载功能（文件导出功能）

梦里梦外; 2022-05-09 03:48 462阅读 0赞

1.页面代码

<a class="layui-btn" href="${pageContext.request.contextPath}/bAndWListManage/downloadWhiteListTmp.do" onclick="downloadTemplate();">模板下载</a>

2.后台代码

@RequestMapping("downloadWhiteListTmp")  
    public ResponseEntity<byte[]> downloadWhiteListTmp(HttpServletRequest request) {  
        HttpHeaders headers = new HttpHeaders();
        String fileName="importVehicleWhitelist.xls";
        ServletContext servletContext = request.getServletContext();
        String realPath = servletContext.getRealPath("/bwlmm/templateFiles/"+fileName); 
        File file = new File(realPath);
        InputStream in;
        byte[] body=null;
        ResponseEntity<byte[]> response =null;
        try {
            in = new FileInputStream(new File(realPath));
                body=new byte[in.available()];// 返回下一次对此输入流调用的方法可以不受阻塞地从此输入流读取（或跳过）的估计剩余字节数
                in.read(body);//读入到输入流里面
               fileName=new String(fileName.getBytes("gbk"),"iso8859-1");//防止中文乱码
               headers.add("Content-Disposition", "attachment;filename="+fileName);
               HttpStatus statusCode = HttpStatus.OK;//设置响应吗
               response =new ResponseEntity<byte[]>(body, headers, statusCode);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }//将该文件加入到输入流之中
        catch (IOException e) {
            e.printStackTrace();
        }
       return response;
    }