Java Post request with form data

问题:

I want to make a simple POST call in Java,
I am getting a 200 response code but, with the wrong response message,
I am told there is a different way to make a Post call when using a form data.

Following is my current Java code to make the post call -

private String makePostCall(){
        try {
            String url = "http://someIp/trusted";
            HttpClient client = new DefaultHttpClient();
            HttpPost post = new HttpPost(url);

            // add header
            List<NameValuePair> urlParameters = new ArrayList<NameValuePair>();
            urlParameters.add(new BasicNameValuePair("username", "app_user"));

            post.setEntity(new UrlEncodedFormEntity(urlParameters));

            HttpResponse response = client.execute(post);
            System.out.println("\nSending 'POST' request to URL : " + url);
            System.out.println("Post parameters : " + post.getEntity());
            System.out.println("Response Code : " + response.getStatusLine().getStatusCode());

            BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
            StringBuffer result = new StringBuffer();
            String line = "";
            while ((line = rd.readLine()) != null) {
                result.append(line);
            }

            System.out.println(result.toString());
            return result.toString();

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

Following is the Post call sample that is working through Postman app -

I am referring the following website -
https://www.mkyong.com/java/how-to-send-http-request-getpost-in-java/

The expected outcome of the post call is supposed to be a Token ie. a String value, current response is -1.

回答1:

Give a try by setting content type multipart/form-data explicitly,

post.setHeader("Content-Type", "multipart/form-data");

In your code ,

post.setEntity(new UrlEncodedFormEntity(urlParameters)); 
post.setHeader("Content-Type", "multipart/form-data");