Refactor classes

src/main/java/support/Rest.java

@@ -0,0 +1,84 @@
+package support;
+
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+import com.google.gson.Gson;
+
+import org.apache.http.HttpResponse;
+import org.apache.http.client.methods.CloseableHttpResponse;
+import org.apache.http.client.methods.HttpGet;
+import org.apache.http.client.methods.HttpPut;
+import org.apache.http.entity.StringEntity;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.impl.client.HttpClients;
+import org.apache.http.util.EntityUtils;
+/**
+ * A generic class to perform HTTP calls and parse the resulting JSON.
+ *
+ * @author <a href="mailto:luigi.derussis@uniupo.it">Luigi De Russis</a>
+ * @version 1.0 (18/05/2017)
+ */
+public class Rest {
+
+    // init gson
+    private static final Gson gson = new Gson();
+
+    /**
+     * Perform a GET request towards a server
+     *
+     * @param URL the @link{URL} to call
+     * @return the response, parsed from JSON
+     */
+    public static Map<String, ?> get(String URL) {
+        // init
+        Map<String, ?> response = new HashMap<>();
+
+        CloseableHttpClient httpclient = HttpClients.createDefault();
+        HttpGet request = new HttpGet(URL);
+
+        CloseableHttpResponse result = null;
+
+        try {
+            result = httpclient.execute(request);
+            String json = EntityUtils.toString(result.getEntity());
+            // do something useful with the response body
+            response = gson.fromJson(json, Map.class);
+            // should be inside a finally...
+            result.close();
+            httpclient.close();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        return response;
+    }
+
+    /**
+     * Perform a PUT request towards a server
+     *
+     * @param URL         the @link{URL} to call
+     * @param contentBody the content body of the request
+     * @param contentType the content type of the request
+     */
+    public static void put(String URL, String contentBody, String contentType) {
+        // init
+        CloseableHttpClient httpclient = HttpClients.createDefault();
+        HttpPut request = new HttpPut(URL);
+        StringEntity params = null;
+
+        try {
+            params = new StringEntity(contentBody);
+            request.addHeader("content-type", contentType);
+            request.setEntity(params);
+            // I don't really care about the response
+            HttpResponse result = httpclient.execute(request);
+            // should be in finally...
+            httpclient.close();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+
+    }
+
+}