Using httpbin.org to test our HTTP request with HTTP Basic Authentication<\/h2>\n
For the sake of brevity, we will use an endpoint from httpbin.org<\/a> to test out the Java codes that we are going to write. <\/p>\n This endpoint is available at http:\/\/httpbin.org\/basic-auth\/user\/passwd<\/a>. It expects a HTTP Basic Authentication request with:<\/p>\n The first step in crafting a HTTP request for a HTTP Basic Authentication endpoint is to generate a Base64 encoded String payload from the username and password. Lucky for us, Java 8<\/a> provided The following Java 8 codes generate a Base64 encoded String payload with user<\/strong> as the username and passwd<\/strong> as the password:<\/p>\n To generate the HTTP Basic Authentication payload, we simply:<\/p>\n With the To avoid external libraries, we can use the following classes that are provided by the Java code library for sending the HTTP request:<\/p>\n And write the following codes to send a HTTP GET request to a HTTP Basic Authentication endpoint:<\/p>\n The following is a Java main class that contains all the codes that we had discussed:<\/p>\n Running the above code will produce the following output:<\/p>\n You may wish to change the String literal that is assigned to the One common task for Java developers is to write codes that communicate with API endpoints. Chances are these endpoints could use HTTP Basic Authentication for authenticating the HTTP request sender. <\/p>\n Although there are good libraries to help us craft and send HTTP requests to a web server in Java, I prefer to use the Java core library so as to keep my Java program lightweight. <\/p>\n\n
Java codes for generating a Base64 encoded String payload from a username and password pair <\/h2>\n
java.util.Base64<\/code><\/a> to help us with Base64 encoding.<\/p>\n\r\nString usernameColonPassword = "user:passwd";\r\nString basicAuthPayload = "Basic " + Base64.getEncoder().encodeToString(usernameColonPassword.getBytes());\r\n<\/pre>\n
\n
Base64.getEncoder().encodeToString<\/code> to get a Base64 encoded String,<\/li>\nJava codes for sending HTTP request to the HTTP Basic Authentication endpoint<\/h2>\n
basicAuthPayload<\/code>, we can then proceed with crafting and sending the HTTP request to the HTTP Basic Authentication endpoint. <\/p>\n\n
\r\nBufferedReader httpResponseReader = null;\r\ntry {\r\n \/\/ Connect to the web server endpoint\r\n URL serverUrl = new URL("http:\/\/httpbin.org\/basic-auth\/user\/passwd");\r\n HttpURLConnection urlConnection = (HttpURLConnection) serverUrl.openConnection();\r\n\r\n \/\/ Set HTTP method as GET\r\n urlConnection.setRequestMethod("GET");\r\n\r\n \/\/ Include the HTTP Basic Authentication payload\r\n urlConnection.addRequestProperty("Authorization", basicAuthPayload);\r\n\r\n \/\/ Read response from web server, which will trigger HTTP Basic Authentication request to be sent.\r\n httpResponseReader =\r\n new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));\r\n String lineRead;\r\n while((lineRead = httpResponseReader.readLine()) != null) {\r\n System.out.println(lineRead);\r\n }\r\n\r\n} catch (IOException ioe) {\r\n ioe.printStackTrace();\r\n} finally {\r\n\r\n if (httpResponseReader != null) {\r\n try {\r\n httpResponseReader.close();\r\n } catch (IOException ioe) {\r\n \/\/ Close quietly\r\n }\r\n }\r\n}\r\n<\/pre>\nPutting it together<\/h2>\n
\r\nimport java.io.BufferedReader;\r\nimport java.io.IOException;\r\nimport java.io.InputStreamReader;\r\nimport java.net.HttpURLConnection;\r\nimport java.net.URL;\r\nimport java.util.Base64;\r\n\r\n\r\npublic class HttpBasicAuthenticationExample {\r\n\r\n public static void main(String[] args) {\r\n\r\n String usernameColonPassword = "user:passwd";\r\n String basicAuthPayload = "Basic " + Base64.getEncoder().encodeToString(usernameColonPassword.getBytes());\r\n\r\n BufferedReader httpResponseReader = null;\r\n try {\r\n \/\/ Connect to the web server endpoint\r\n URL serverUrl = new URL("http:\/\/httpbin.org\/basic-auth\/user\/passwd");\r\n HttpURLConnection urlConnection = (HttpURLConnection) serverUrl.openConnection();\r\n\r\n \/\/ Set HTTP method as GET\r\n urlConnection.setRequestMethod("GET");\r\n\r\n \/\/ Include the HTTP Basic Authentication payload\r\n urlConnection.addRequestProperty("Authorization", basicAuthPayload);\r\n\r\n \/\/ Read response from web server, which will trigger HTTP Basic Authentication request to be sent.\r\n httpResponseReader =\r\n new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));\r\n String lineRead;\r\n while((lineRead = httpResponseReader.readLine()) != null) {\r\n System.out.println(lineRead);\r\n }\r\n\r\n } catch (IOException ioe) {\r\n ioe.printStackTrace();\r\n } finally {\r\n\r\n if (httpResponseReader != null) {\r\n try {\r\n httpResponseReader.close();\r\n } catch (IOException ioe) {\r\n \/\/ Close quietly\r\n }\r\n }\r\n }\r\n\r\n }\r\n\r\n}\r\n<\/pre>\n\r\n{\r\n "authenticated": true, \r\n "user": "user"\r\n}\r\n<\/pre>\nusernameColonPassword<\/code> variable and observe what happens. <\/p>\n\n \n
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