How to Implement a Controller Class with a Response that Does Not Return view (jsp)

How do I implement a controller class that calls from an external application that is not Java and returns download files?
You can access the following URL to open a download dialog on the caller screen:
If Spring does not return jsp and only returns the download file, the return will be empty if implemented below.
What is the correct implementation method?

@Controller
public class downloadController {
    @RequestMapping(path="/download", method="GET")
    public String download (@RequestParamparam, HttpServletResponseres) arrows Exception {
        // processing of something
        res.setContentType("application/octed-stream");
        res.Header("Content-Disposition", String.format(" attachment; filename=\"+fileName+"\""));
        FileCopyUtils.copy(new BufferedInputStream(newFileInputStream(file))), res.getOutputStream());
        return '';
    }
}

configuring:dynamic projects
Spring: 5.3.19

java spring

2023-02-09 07:07

1 Answers

Implement the View (AbstractView) class that returns the download file, and implement the Controller class to return the View name.(Image to move what Controller implements to View)

Implementation Image (View)

import org.springframework.web.servlet.view.AbstractView;
// Omit other import

@Component
public class DownloadView extensions AbstractView {
    @ Override
    protected void renderMergedOutputModel(
        Map<String, Object>model,
        HttpServletRequest request,
        HttpServletResponse response)
            US>throws Exception {
        String fileName=(String)model.get("fileName");

        response.setContentType("application/octed-stream");
        response.Header("Content-Disposition", String.format(" attachment; filename=\"+fileName+"\");
        FileCopyUtils.copy(new BufferedInputStream(newFileInputStream(filename))), response.getOutputStream());
    }
}

Implementation Image (Controller)

@Controller
public class downloadController {
    @RequestMapping(path="/download", method="GET")
    public String download (@RequestParamparam, HttpServletResponseres, Model model) arrows Exception {
        // processing of something

        // set the filename to download
        model.addAttribute("fileName", param.getFilename());
        return "downloadView";
    }
}

2023-02-09 07:58

If you have any answers or tips

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