spring MVC 文件下载

最新推荐文章于 2023-12-23 19:44:55 发布

原创最新推荐文章于 2023-12-23 19:44:55 发布 · 129 阅读

CC 4.0 BY-SA版权

本文详细介绍了如何使用Spring MVC中的@Controller注解实现文件下载功能。通过@RequestMapping注解指定URL路径，利用HttpServletRequest获取请求参数，如文件名和路径。设置HttpServletResponse响应头以允许浏览器下载文件，并正确处理中文文件名的编码问题。文章还展示了如何读取文件并将其作为字节流发送到客户端，包括使用FileInputStream和BufferedInputStream进行文件读取，以及使用OutputStream将文件写入HTTP响应。

直接上代码：

@RequestMapping("/patchDownLoad")
public void patchDownLoad(HttpServletRequest request, 
                          HttpServletResponse response) throws Exception {
    String patchName = request.getParameter("patchName");
    String patchPath = request.getParameter("patchPath");
    File file = new File(patchPath);
    response.setContentType("application/octet-stream");
    //下载显示的中文名，解决中文名称乱码问题
    String downloadFileName = new String(patchName.getBytes("UTF-8"),"ISO-8859-1");
    //application/octet-stream:二进制流数据
    response.addHeader("Content-Disposition", "attachment;filename=" + downloadFileName);
    byte[] buffer = new byte[2014];
    FileInputStream fis = null;
    BufferedInputStream bis = null;
    try {
        fis = new FileInputStream(file);
        bis = new BufferedInputStream(fis);
        OutputStream os = response.getOutputStream();
        int i = bis.read(buffer);
        while (i != -1) {
            os.write(buffer, 0, i);
            i = bis.read(buffer);
        }
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } finally {
        if (bis != null) {
            try {
                bis.close();
            } catch (Exception e) {
            }
        }

        if (fis != null) {
            try {
                fis.close();
            } catch (Exception e) {
            }
        }
    }
}