I want to consume rest api from url with http basic authentication that returns a big json & then i want to parse that json without POJO to get some values out of it. How can i achieve that in java spring?
I know this is common question but i could not get proper solution that worked for me.
Please help me someone.
Using the Apache HttpClient, the following Client Code snipped has been copied from the following URL. The comments have been added by myself.
https://www.baeldung.com/httpclient-4-basic-authentication
HttpGet request = new HttpGet(URL_SECURED_BY_BASIC_AUTHENTICATION);
// Combine the user and password pair into the right format
String auth = DEFAULT_USER + ":" + DEFAULT_PASS;
// Encode the user-password pair string in Base64
byte[] encodedAuth = Base64.encodeBase64(
auth.getBytes(StandardCharsets.ISO_8859_1));
// Build the header String "Basic [Base64 encoded String]"
String authHeader = "Basic " + new String(encodedAuth);
// Set the created header string as actual header in your request
request.setHeader(HttpHeaders.AUTHORIZATION, authHeader);
HttpClient client = HttpClientBuilder.create().build();
HttpResponse response = client.execute(request);
int statusCode = response.getStatusLine().getStatusCode();
assertThat(statusCode, equalTo(HttpStatus.SC_OK));
I am trying to send SMS messages when a button is clicked in an Android app. I have the SMS sending code in Python using a REST API. The template looks like so:
import requests
url = "https://api.apidaze.io/{{api_key}}/sms/send"
querystring = {"api_secret":"{{api_secret}}"}
payload = "from=15558675309&to=15551234567&body=Have%20a%20great%20day."
headers = {'Content-Type': 'application/x-www-form-urlencoded'}
response = requests.request("POST", url, data=payload, headers=headers,
params=querystring)
print(response.text)
Because I am making an Android app, I need this to be in Java, but I am having trouble making the same POST request with the same parameters, headers, and body in JAVA.
Does anyone know how to make convert this template into something I can use for an Android app in Java?
There is a port of Apache Http Client for Android:
http://hc.apache.org/httpcomponents-client-4.3.x/android-port.html
Check the documentation, a simple POST request is very easy using this library:
HttpPost httpPost = new HttpPost("https://api.apidaze.io/" + api_key + "/sms/send");
String json = "{"api_secret":" + api_secret + "}";
StringEntity entity = new StringEntity(json);
httpPost.setEntity(entity);
httpPost.setHeader("Content-type", "application/x-www-form-urlencoded");
CloseableHttpResponse response = client.execute(httpPost);
I'm trying to post some json data using a http post method within my android application however i cannot seem to get it to work, the string is building fine and it works if i test using google chrome addon advanced rest client. I'm not the strongest with JSON hence why it is a string and not a JSON object. The Post request does not execute. Thanks in advance
String json = "{\"data\": [";
for (String tweet : tweetContent)
{
json = json + "{\"text\": \"" + tweet + "\", \"query\": \"" + SearchTerm + "\", \"topic\": \"movies\"},";
}
json = json.substring(0, json.length() - 1);
json = json + "]}";
Log.i("matt", json);
// Create a new HttpClient and Post Header
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://www.sentiment140.com/api/bulkClassifyJson?appid=matt-43#hotmail.com");
StringEntity entity = new StringEntity(json, HTTP.UTF_8);
httppost.setEntity(entity);
// Execute HTTP Post Request
HttpResponse response = httpclient.execute(httppost);
String responseBody = EntityUtils.toString(response.getEntity());
Log.i(LOG_TAG, responseBody);
sentiments.add(responseBody.toString());
what is the response code that you are getting back after posting from the Http client.
It should be 200 for a successful Http post. Other wise there is some issue.
You are posting the JSON data to the URL. which application is reading this data from the URL. Is there some servlet on the other application that is reading JSON data fromrequest. check that and see.
Also check the request headers for the Http Post request. if you are setting all the request headers properly.
What I want to do is submit a web form from a java application. The form I need to fill out is located here: http://cando-dna-origami.org/
When the form is submitted, the server sends a confirmation email to the email address given, which for now I'm just checking by hand. I've tried filling out the form manually, and the emails get sent fine. (It should also be noted that when the form is filled out incorrectly, the page just refreshes and doesn't give any feedback).
I've never done anything with http before, but I looked around for a while, and came up with the following code, which is supposed to send a POST request to the server:
String data = "name=M+V&affiliation=Company&email="
+ URLEncoder.encode("m.v#gmail.com", "UTF-8")
+ "&axialRise=0.34&helixDiameter=2.25&axialStiffness=1100&bendingStiffness=230" +
"&torsionalStiffness=460&nickStiffness=0.01&resolution=course&jsonUpload="
+ URLEncoder.encode("C:/Users/Marjie/Downloads/twisted_DNA_bundles/monotwist.L1.v1.json",
"UTF-8") + "&type=square";
URL page = new URL("http://cando-dna-origami.org/");
HttpURLConnection con = (HttpURLConnection) page.openConnection();
con.setDoOutput(true);
con.setRequestMethod("POST");
con.connect();
OutputStreamWriter out = new OutputStreamWriter(con.getOutputStream());
out.write(data);
out.flush();
System.out.println(con.getResponseCode());
System.out.println(con.getResponseMessage());
out.close();
con.disconnect();
However, when it runs it doesn't appear to do anything - that is, I don't get any emails, although the program does print "200 OK" to System.out, which seems to indicate that something got received from the server, although I'm not sure what it means exactly. I think the problem might be in the file uploading, since I wasn't sure whether that data type required a different format.
Is this a correct way to send a POST request using Java? Do I need to do something different for the file uploading? Thanks!
After reading Adam's post, I used Apache HttpClient and wrote the following code:
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("type", "square"));
//... add more parameters
UrlEncodedFormEntity entity = new UrlEncodedFormEntity(params, HTTP.UTF_8);
HttpPost post = new HttpPost("http://cando-dna-origami.org/");
post.setEntity(entity);
HttpResponse response = new DefaultHttpClient().execute(post);
post = new HttpPost("http://cando-dna-origami.org/");
post.setEntity(new FileEntity(new File("C:/Users/Marjie/Downloads/twisted_DNA_bundles/monotwist.L1.v1.json"), "text/plain; charset=\"UTF-8\""));
HttpResponse responseTwo = new DefaultHttpClient().execute(post);
However, it still doesn't seem to be working; again, I wasn't sure how the uploaded file fit into the form, so I tried just sending two separate POST requests, one with the form and one with the other data. I am still looking for a way to combine these into one request; does anybody know something about this?
You would probably be better off using something like Apache HttpClient, with which you can build up a POST request programatically.
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://.../whatever");
List <NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("param1", "value1"));
params.add(new BasicNameValuePair("param2", "value2"));
...
httpost.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
HttpResponse response = httpclient.execute(httppost);
If you need to upload a file along with your form, you will need to use a MultipartEntity instead:
MultipartEntity reqEntity = new MultipartEntity();
reqEntity.addPart("someParam", "someValue");
reqEntity.addPart("someFile", new FileBody("/some/file"));
....
httpost.setEntity(reqEntity);
There are some sample programs over on their site. The "Form based logon" and "Multipart encoded request entity" are good examples to start from.
It may also be worthwhile testing out your connections and taking a look at the underlying network data to see what is happening. Something like Firebug will let you see exactly what is happening in your browser, and you can turn up the HttpClient logging to see all of the data exchanged in your program. Alternatively, you can use something like Wireshark or Fiddler to watch your network traffic in real-time. This may give you a better idea of exactly what your browser is doing, versus what your program is doing.
As most of the suggested Java HTTP POST request code out there is not operational, I decided to give you my fully operational code that I'm sure you'll find helpful to create any Java-based POST request in the future.
This POST request is of multipart type to allow sending/uploading a file to the server.
Multipart request consist of a main header and a separator string called boundary to tell each part from the other (this separator will come in the stream with "--" (two dashes) string before it, and each part has its own small header to tell its type and some more meta-data.
My task was to create a PDF file using some online services but all the multipart POST examples just didn't do the trick...
I needed to pack an HTML document along with its pics, JS and CSS files in a ZIP/TAR file, upload it to an online html2pdf conversion service and get the result as a PDF document back to me as the response (stream) from the service.
The current service I've checked the using following code is: Htmlpdfapi.com but I'm sure that with minor adjustments you'll be able to use it with any other service.
The method call (for that service) looks something like:
[class instance name].sendPOSTRequest("http://htmlpdfapi.com/api/v1/pdf", "Token 6hr4-AmqZDrFVjAcJGykjYyXfwG1wER4", "/home/user/project/srv/files/example.zip", "result.pdf");
Here is my code that was checked and 100% works:
public void sendPOSTRequest(String url, String authData, String attachmentFilePath, String outputFilePathName)
{
String charset = "UTF-8";
File binaryFile = new File(attachmentFilePath);
String boundary = "------------------------" + Long.toHexString(System.currentTimeMillis()); // Just generate some unique random value.
String CRLF = "\r\n"; // Line separator required by multipart/form-data.
int responseCode = 0;
try
{
//Set POST general headers along with the boundary string (the seperator string of each part)
URLConnection connection = new URL(url).openConnection();
connection.setDoOutput(true);
connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
connection.addRequestProperty("User-Agent", "CheckpaySrv/1.0.0");
connection.addRequestProperty("Accept", "*/*");
connection.addRequestProperty("Authentication", authData);
OutputStream output = connection.getOutputStream();
PrintWriter writer = new PrintWriter(new OutputStreamWriter(output, charset), true);
// Send binary file - part
// Part header
writer.append("--" + boundary).append(CRLF);
writer.append("Content-Disposition: form-data; name=\"file\"; filename=\"" + binaryFile.getName() + "\"").append(CRLF);
writer.append("Content-Type: application/octet-stream").append(CRLF);// + URLConnection.guessContentTypeFromName(binaryFile.getName())).append(CRLF);
writer.append(CRLF).flush();
// File data
Files.copy(binaryFile.toPath(), output);
output.flush();
// End of multipart/form-data.
writer.append(CRLF).append("--" + boundary + "--").flush();
responseCode = ((HttpURLConnection) connection).getResponseCode();
if(responseCode !=200) //We operate only on HTTP code 200
return;
InputStream Instream = ((HttpURLConnection) connection).getInputStream();
// Write PDF file
BufferedInputStream BISin = new BufferedInputStream(Instream);
FileOutputStream FOSfile = new FileOutputStream(outputFilePathName);
BufferedOutputStream out = new BufferedOutputStream(FOSfile);
int i;
while ((i = BISin.read()) != -1) {
out.write(i);
}
// Cleanup
out.flush();
out.close();
}
catch(Exception e)
{
e.printStackTrace();
}
}
I am currently writing a small web server, and I tested your request client. My server is receiving the following request:
User-Agent: Java/1.6.0_20
Host: localhost:1700
Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
Connection: keep-alive
Content-type: application/x-www-form-urlencoded
Content-Length: 287
name=M+V&affiliation=Company&email=m.v%40gmail.com&axialRise=0.34&helixDiameter=2.25&axialStiffness=1100&bendingStiffness=230&torsionalStiffness=460&nickStiffness=0.01&resolution=course&jsonUpload=C%3A%2FUsers%2FMarjie%2FDownloads%2Ftwisted_DNA_bundles%2Fmonotwist.L1.v1.json&type=square
You should check the format of the POST data you are sending, most probably it is not processed by the server as you would expect.
You should definitively use apaches HTTPClient for that job! It makes life much easier. Here is an example how to upload a file with apaches HttpClient.
byte[] data = outStream.toByteArray()
HttpClient client = new DefaultHttpClient();
HttpPost httpPost = new HttpPost("http://localhost:8080/YourResource");
ByteArrayBody byteArrayBody = new ByteArrayBody(data, "application/json", "some.json");
MultipartEntity multipartEntity = new MultipartEntity();
multipartEntity.addPart("upload", byteArrayBody);
httpPost.setEntity( multipartEntity );
HttpResponse response = client.execute(httpPost);
Reader reader = new InputStreamReader(response.getEntity().getContent());
Let me know if you have further questions.
Here's an example I got working that uses apache httpclient. Also, don't forget to add these dependencies:
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.4.1</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpmime</artifactId>
<version>4.4.1</version>
</dependency>
The code:
HttpClient httpclient = HttpClientBuilder.create().build();
HttpPost httppost = new HttpPost(DataSources.TORRENT_UPLOAD_URL);
MultipartEntityBuilder builder = MultipartEntityBuilder.create();
builder.addPart("a_field_name", new FileBody(torrentFile));
HttpEntity entity = builder.build();
httppost.setEntity(entity);
HttpResponse response = httpclient.execute(httppost);
I'm using the org.apache.http.HttpResponse class in my Java application, and I need to be able to get the HTTP status code. If I used .toString() on it, I can see the HTTP status code in there. Is there any other function that I can just get the HTTP status code as either an int or String?
Thanks a bunch!
Use HttpResponse.getStatusLine(), which returns a StatusLine object containing the status code, protocol version and "reason".
I have used httpResponse.getStatusLine().getStatusCode() and have found this to reliably return the integer http status code.
httpResponse.getStatusLine().getStatusCode()
A example will be as below,
final String enhancementPayload ="sunil kumar";
HttpPost submitFormReq = new HttpPost("https://bgl-ast/rest/service/form/form-data");
StringEntity enhancementJson = new StringEntity(enhancementPayload);
submitFormReq.setEntity(enhancementJson);
submitFormReq.setHeader("Content-Type", "application/xml");
HttpResponse response = httpClient.execute( submitFormReq );
String result = EntityUtils.toString(response.getEntity());
System.out.println("result "+result);
assertEquals(200, response.getStatusLine().getStatusCode());