Created
May 7, 2020 18:37
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Keycloak REST APIs - Get bearer token
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import java.io.*; | |
import java.net.HttpURLConnection; | |
import java.net.URL; | |
import java.net.URLEncoder; | |
import java.util.LinkedHashMap; | |
import java.util.Map; | |
public class GetToken { | |
public static void main(String[] args) throws IOException { | |
new GetToken().getBearerToken(); | |
} | |
public String getBearerToken() throws IOException{ | |
String client_id = "login-app"; | |
String grant_type = "client_credentials"; | |
String client_secret = "6b574a0b-6624-4d7a-9ac6-485c1fdcc9e0"; | |
String port = "8081"; | |
String realm = "api"; | |
String server = "localhost"; | |
String content_type = "application/x-www-form-urlencoded"; | |
String method_type = "POST"; | |
String encode_type = "UTF-8"; | |
URL url = new URL("http://"+ server +":"+ port +"/auth/realms/"+ realm +"/protocol/openid-connect/token"); | |
Map params = new LinkedHashMap(); | |
params.put("client_id", client_id); | |
params.put("grant_type", grant_type); | |
params.put("client_secret", client_secret); | |
StringBuilder postData = new StringBuilder(); | |
for(Map.Entry param : params.entrySet()){ | |
if (postData.length() != 0) postData.append('&'); | |
postData.append(URLEncoder.encode(param.getKey(), encode_type)); | |
postData.append('='); | |
postData.append(URLEncoder.encode(String.valueOf(param.getValue()), encode_type)); | |
} | |
byte[] postDataBytes = postData.toString().getBytes(encode_type); | |
HttpURLConnection conn = (HttpURLConnection)url.openConnection(); | |
conn.setRequestMethod(method_type); | |
conn.setRequestProperty("Content-Type", content_type); | |
conn.setRequestProperty("Content-Length", String.valueOf(postDataBytes.length)); | |
conn.setDoOutput(true); | |
conn.getOutputStream().write(postDataBytes); | |
BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream(), encode_type)); | |
String line; | |
StringBuilder result = new StringBuilder(); | |
while ((line = in.readLine()) != null) { | |
result.append(line); | |
} | |
String response = result.toString(); | |
String[] array = response.split(","); | |
String[] accessToken = array[0].split(":"); | |
String token = accessToken[1].replace("\"",""); | |
System.out.println(token); | |
return token; | |
} | |
} |
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