Java: Add MergedPdf sample

Java/MergedPdf.java

@@ -0,0 +1,67 @@
+import io.github.cdimascio.dotenv.Dotenv;
+import java.io.File;
+import java.io.IOException;
+import okhttp3.MediaType;
+import okhttp3.MultipartBody;
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.RequestBody;
+import okhttp3.Response;
+import org.json.JSONObject;
+
+public class MergedPdf {
+
+  // Specify the paths to your file here, or as the arguments when running the program.
+  public static final String[] DEFAULT_FILE_PATHS =
+      new String[] {"/path/to/file1.pdf", "/path/to/file2.pdf"};
+
+  // Specify your API key here, or in the environment variable PDFREST_API_KEY.
+  // You can also put the environment variable in a .env file.
+  public static final String DEFAULT_API_KEY = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx";
+
+  public static void main(String[] args) {
+    String[] inputFilePaths;
+    if (args.length > 0) {
+      inputFilePaths = args;
+    } else {
+      inputFilePaths = DEFAULT_FILE_PATHS;
+    }
+
+    final Dotenv dotenv = Dotenv.configure().ignoreIfMalformed().ignoreIfMissing().load();
+
+    MultipartBody.Builder bodyBuilder = new MultipartBody.Builder().setType(MultipartBody.FORM);
+
+    for (String inputFilePath : inputFilePaths) {
+      final File inputFile = new File(inputFilePath);
+      final RequestBody inputFileRequestBody =
+          RequestBody.create(inputFile, MediaType.parse("application/pdf"));
+      bodyBuilder
+          .addFormDataPart("file", inputFile.getName(), inputFileRequestBody)
+          .addFormDataPart("pages", "1-last")
+          .addFormDataPart("type", "file");
+    }
+
+    RequestBody requestBody = bodyBuilder.addFormDataPart("output", "pdfrest_merged_pdf").build();
+
+    Request request =
+        new Request.Builder()
+            .header("Api-Key", dotenv.get("PDFREST_API_KEY", DEFAULT_API_KEY))
+            .url("https://api.pdfrest.com/merged-pdf")
+            .post(requestBody)
+            .build();
+    try {
+      OkHttpClient client = new OkHttpClient().newBuilder().build();
+      Response response = client.newCall(request).execute();
+      System.out.println("Result code " + response.code());
+      assert response.body() != null;
+      System.out.println(prettyJson(response.body().string()));
+    } catch (IOException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  private static String prettyJson(String json) {
+    // https://stackoverflow.com/a/9583835/11996393
+    return new JSONObject(json).toString(4);
+  }
+}