BAEL-2452: Using curl from Java (#6043)

* BAEL-2452: Using curl from Java

* A re-do of the examples using tests, instead of main class

* Fix un-used variable

core-java/src/main/java/com/baeldung/curltojava/JavaCurlExamples.java

@@ -0,0 +1,29 @@
+package com.baeldung.curltojava;
+
+import java.io.BufferedInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+public class JavaCurlExamples {
+
+    public static String inputStreamToString(InputStream inputStream) {
+        final int bufferSize = 8 * 1024;
+        byte[] buffer = new byte[bufferSize];
+        final StringBuilder builder = new StringBuilder();
+        try (BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream, bufferSize)) {
+            while (bufferedInputStream.read(buffer) != -1) {
+                builder.append(new String(buffer));
+            }
+        } catch (IOException ex) {
+            Logger.getLogger(JavaCurlExamples.class.getName()).log(Level.SEVERE, null, ex);
+        }
+        return builder.toString();
+    }
+
+    public static void consumeInputStream(InputStream inputStream) {
+        inputStreamToString(inputStream);
+    }
+
+}