Description: Java Consume REST API (GET/POST/PUT/DELETE)
Imports
import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL;URL url = new URL(String); HttpURLConnection conn = (HttpURLConnection) url.openConnection();Sets the general request property. If a property with the key already exists, overwrite its value with the new value.
RequestMethod:
- GET;
- POST;
- PUT;
- DELETE;
conn.setRequestProperty("Accept", "application/json"); conn.setRequestProperty("Content-Type", "application/json"); conn.setRequestMethod("POST");To enable Output (Request Body) setting: true
conn.setDoOutput(true);To enable Output (Response Body) setting: true
conn.setDoInput(true);When a request requires a body (request Body) it is necessary to use OutputStreamWriter to send the data.
OutputStreamWriter output = new OutputStreamWriter(conn.getOutputStream()); output.write(resquestBody.toString()); output.flush();Gets the status code from an HTTP response message.
conn.getResponseCode() conn.getResponseMessage()Output
Status: 200 - OK
When a request receives a body (response Body), it is necessary to use the InputStreamReader to receive the data.
InputStreamReader input = new InputStreamReader(conn.getInputStream()); BufferedReader br = new BufferedReader(input); String line = null; StringBuilder responseBody = new StringBuilder(); responseBody.append("responseBody:\n"); while ((line = br.readLine()) != null) { responseBody.append("\t" + line + "\n"); }When finished, just disconnect the connection.
conn.disconnect();Code;
- MalformedURLException
- IOException