Question

我在我的jsp中有这样的下载选项

<a href='<c:url value="/licensing/download.sp?name=${namelist.name}&downloadUrl=${namelist.url}"/>'>

<img src="/images/download.gif" alt="Download" border="0" align="right">

在上面的“url”是文件的位置，name是文件名。点击jsp iam中的下载选项调用控制器方法下载，在控制器中

public ModelAndView download(HttpServletRequest request, HttpServletResponse response, DevTechBean devTechBean) throws Exception {
        cat.debug("MySuiteListController: download: begin");
        ModelAndView modelView = super.handleLicensingRequest(request, response);
        String name = request.getParameter("name");

        String url1 = request.getParameter("downloadUrl");
        cat.debug(" download: url ="+url1);

        String downloadurl1="https://my.net:8869"+url1;
        cat.debug(" download: downloadurl ="+downloadurl1);
    try{
        URL url = new URL(downloadurl1);  
        //response.setHeader("Content-Type", "text/csv");  
        response.setHeader("Content-disposition", "attachment;filename="+name);
        URLConnection connection = url.openConnection();
        InputStream stream = connection.getInputStream();
        BufferedOutputStream outs = new BufferedOutputStream(response.getOutputStream());
        int len;
        byte[] buf = new byte[1024];
        while ((len = stream.read(buf)) > 0) {
          outs.write(buf, 0, len);
        }
        outs.close();
    }
    catch (MalformedURLException e) { 
        cat.error("Error occurrred in url");

    } 
    catch (IOException e) { 
        cat.error("Error occurrred ");

    }
        String viewName = "swl_download";
    modelView.setViewName(viewName);
return modelView;       

}

但是当我点击下载时，我发现文件未找到异常。我认为问题是由url值引起的。在上面的iam值为downloadurl = / files / download / hai.txt

当我给出

<a href="${namelist.url}"/>
<img src="/images/download.gif" alt="Download" border="0" align="right"></a><br/><br/></td>

点击文件在浏览器中打开，网址为https://my.net:8869//files/download/hai.txt(but，此处为href iam仅提供此链接“/files/download/hai.txt”不知道整个链接的来源。

但如果给这样的链接调用控制器打开该文件弹出。

<a href='<c:url value="/download.sp?name=${namelist.name}&downloadUrl=${namelist.url}"/>'>

它正在获取文件未找到异常。我认为这是由于我在上面添加了这样的内容

String downloadurl1="https://my.net:8869"+url1;

但是我得到的文件没有找到异常。请帮我解决这个问题。

Answer 1

试试这个：

@RequestMapping(value="/viewAttach", method = RequestMethod.GET)
public ModelAndView viewAttach(@RequestParam(value="article_id", required = true) String article_ref, HttpSession session, HttpServletResponse response) 
{

    /* *** Check Session *** */
    try {

        // Direclty from pier.content.GetContent written by ang94402

        URL url = new URL(binaryURL);           
        response.setHeader("Content-disposition", "attachment;filename=" + binary.getName());

        //Set the mime type for the response
        response.setContentType("application/pdf");

        // URLConnection connection = url.openConnection();
        InputStream is = url.openStream();

        BufferedOutputStream outs = new BufferedOutputStream(response.getOutputStream());
        int len;
        byte[] buf = new byte[1024];
        while ( (len = is.read(buf)) > 0 ) {
            outs.write(buf, 0, len);
        }
        outs.close();

    } catch (MalformedURLException e) {
        logger.error("Error ModelAndView.viewMain - MalformedURLException : " + e.toString() + " -- " + e.getStackTrace()[0].toString());
        return null;
    } catch (IOException e) {
        logger.error("Error ModelAndView.viewMain - IOException : " + e.toString() + " -- " + e.getStackTrace()[0].toString());
        return null;
    }


    return null;

}

Answer 2

这只是一个伪代码。根据您的需要进行更改。

 InputStream is = getClass().getResourceAsStream("filename");

首先尝试弄清楚getClass（）指向哪个目录。（不确定，但它应该是你的App的HOME？）。然后将文件放在相同的位置，如果不是。

希望这会有所帮助。 source

如何使用Spring MVC从url下载文件？

2 个答案: