How to Upload a File and Send JSON Data with Session ID in Postman?

How can I upload a file and send JSON data while including a session ID in Postman using a Spring MVC controller?

/**
* Upload single file using Spring Controller.
*/
@RequestMapping(value = "/uploadFile", method = RequestMethod.POST)
public @ResponseBody ResponseEntity<GenericResponseVO<? extends IServiceVO>> uploadFileHandler(
            @RequestParam("name") String name,
            @RequestParam("file") MultipartFile file,
            HttpServletRequest request,
            HttpServletResponse response) {

    if (!file.isEmpty()) {
        try {
            byte[] bytes = file.getBytes();

            // Creating the directory to store file
            String rootPath = System.getProperty("catalina.home");
            File dir = new File(rootPath + File.separator + "tmpFiles");
            if (!dir.exists()) {
                dir.mkdirs();
            }

            // Create the file on server
            File serverFile = new File(dir.getAbsolutePath() + File.separator + name);
            BufferedOutputStream stream = new BufferedOutputStream(new FileOutputStream(serverFile));
            stream.write(bytes);
            stream.close();

            System.out.println("Server File Location=" + serverFile.getAbsolutePath());

            return null;
        } catch (Exception e) {
            return null;
        }
    }
}

In order to upload a file and send accompanying JSON data in Postman while passing a session ID, you will need to configure your Postman request to include both file and JSON parameters. This can be efficiently handled by using the 'form-data' option in the Postman interface.

// Example of sending JSON data in Postman alongside file upload
file (key: file, type: File, select your file)
json data (key: json, type: Text, value: {"key1":"value1", "key2":"value2"})
headers (key: sessionId, value: your-session-id)

Causes

• Not configuring the request type (POST) properly in Postman.
• Failing to use the 'form-data' type in Postman to include a file upload along with other data.
• Omitting necessary headers or session tokens that the server requires.

Solutions

• Set the request method to POST in Postman.
• Select 'Body' and then 'form-data'. Add a key for the file, and ensure its type is set to 'File'.
• Include another key in 'form-data' for the JSON data, usually as text. This can be done using the 'key' for the data you want to send, ensuring that the JSON structure is correctly formatted.
• If your application requires a session ID, you can add it as a header in Postman. Go to the 'Headers' tab and add a new key-value pair for the session ID.

Mistake: Trying to send JSON data in the body instead of using 'form-data'.

Solution: Make sure to use 'form-data' when uploading files and sending additional data.

Mistake: Forgetting to set the correct content type in headers.

Solution: Ensure that the content type is set correctly in the request headers if necessary.

Mistake: Not including error handling for file upload or incorrect paths on the server.

Solution: Implement error handling in the controller to capture exceptions and handle file upload failures gracefully.