下载存放在项目目录中的文件

Description

把 Template放在项目中，在 UI提供一个下载链接供 User下载。

Code

@Log("INFO")
@RequestMapping("/downloadXXXTemplate")
public void downloadXXXTemplate(HttpServletRequest req, HttpServletResponse resp) throws Exception {
    String fileName = "XXXTemplate.xlsx".toString();
    InputStream inStream = req.getSession().getServletContext().getResourceAsStream("/WEB-INF/classes/XXXTemplate.xlsx");
    // InputStream inStream = req.getServletContext().getResourceAsStream("/WEB-INF/classes/ccar14a/IndicatorTemplate.xlsx");
    // ServletRequest.getServletContext() method is introduced in Servlet 3.0, not 2.3.
    // Need a Servlet 3.0 compatible container such as Tomcat 7, Glassfish 3, etc in Eclipse and set the Target Runtime of your Dynamic Web Project to that container. 
    resp.reset();
    resp.setContentType("bin");
    resp.addHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
    byte[] b = new byte[100];
    int len;
    try {
        while ((len = inStream.read(b)) > 0)
            resp.getOutputStream().write(b, 0, len);
        inStream.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

Reference

• How do I open a file located in WEB-INF?