Исполнение 9 спринта - создание сервера вместе с API для трекера задач

Insomnia_testTaskManager

@@ -0,0 +1 @@
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README.md

@@ -1,7 +1,12 @@
 _java-kanban_
 
 # Трекер задач
-### Согласно задания спринта № 8.
+### Согласно задания спринта № 9.
 ## выполнено Филипповских Сергеем
 
+В проекте в файле Insomnia_testTaskManager - шаблон для Insomnia для проведения тестов.
+Получение списков, удаление и добавление новых объектов - вопросов нет.
+При запросах на обновление в самом Json важно указывать существующий id,
+он влияет на обработку и в строке запроса указывать его-же.
+
 _**Когорта-53**_

java-kanban.iml

@@ -39,5 +39,6 @@
         <SOURCES />
       </library>
     </orderEntry>
+    <orderEntry type="library" name="gson-2.10.1" level="project" />
   </component>
 </module>

src/main/HTTPserver/BaseHttp.java

@@ -0,0 +1,108 @@
+package main.HTTPserver;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.TypeAdapter;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonToken;
+import com.google.gson.stream.JsonWriter;
+import com.sun.net.httpserver.HttpExchange;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.time.Duration;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+import java.util.Optional;
+
+// служебный класс с методами обработки запросов
+class BaseHttp {
+    // Получение идентификатора задачи/подзадачи/эпика
+    static Optional<Integer> getId(String id) {
+        try {
+            return Optional.of(Integer.parseInt(id));
+        } catch (NumberFormatException exception) {
+            return Optional.empty();
+        }
+    }
+
+    // Получение и десериализация Json тела запроса -> в объекты
+    static <T> T fromJsonString(HttpExchange exchange, Class<T> clazz) throws IOException {
+        String body = new String(exchange.getRequestBody().readAllBytes(), StandardCharsets.UTF_8);
+        Gson gson = new GsonBuilder()
+                .setPrettyPrinting()
+                .serializeNulls()
+                .registerTypeAdapter(LocalDateTime.class, new LDTAdapter())
+                .registerTypeAdapter(Duration.class, new DAdapter())
+                .create();
+        return gson.fromJson(body, clazz);
+    }
+
+    // Сериализация объекта в JSON
+    static String toJsonString(Object object) {
+        Gson gson = new GsonBuilder()
+                .setPrettyPrinting()
+                .serializeNulls()
+                .registerTypeAdapter(LocalDateTime.class, new LDTAdapter())
+                .registerTypeAdapter(Duration.class, new DAdapter())
+                .create();
+        return gson.toJson(object);
+    }
+
+    // Адаптер для LocalDateTime
+    static class LDTAdapter extends TypeAdapter<LocalDateTime> {
+        private static final DateTimeFormatter dtf = DateTimeFormatter.ofPattern("dd.MM.yyyy HH:mm:ss.SSS");
+
+        @Override
+        public void write(JsonWriter jsonWriter, LocalDateTime localDateTime) throws IOException {
+            if (localDateTime != null) {
+                jsonWriter.value(localDateTime.format(dtf));
+            } else {
+                jsonWriter.nullValue();
+            }
+        }
+
+        @Override
+        public LocalDateTime read(final JsonReader jsonReader) throws IOException {
+            if (jsonReader.peek() != JsonToken.NULL) {
+                return LocalDateTime.parse(jsonReader.nextString(), dtf);
+            } else {
+                jsonReader.nextNull();
+                return null;
+            }
+        }
+    }
+
+    // Адаптер для Duration
+    static class DAdapter extends TypeAdapter<Duration> {
+        @Override
+        public void write(JsonWriter jsonWriter, Duration duration) throws IOException {
+            if (duration != null) {
+                jsonWriter.value(duration.toString());
+            } else {
+                jsonWriter.nullValue();
+            }
+        }
+
+        @Override
+        public Duration read(final JsonReader jsonReader) throws IOException {
+            if (jsonReader.peek() != JsonToken.NULL) {
+                return Duration.parse(jsonReader.nextString());
+            } else {
+                jsonReader.nextNull();
+                return null;
+            }
+        }
+    }
+
+    // Отправка ответа на запрос
+    static void sendResponse(HttpExchange exchange,
+                                     String responseString,
+                                     int responseCode) throws IOException {
+        byte[] resp = responseString.getBytes(StandardCharsets.UTF_8);
+        exchange.getResponseHeaders().add("Content-Type", "application/json;charset=utf-8");
+        exchange.sendResponseHeaders(responseCode, resp.length);
+        exchange.getResponseBody().write(resp);
+        exchange.close();
+    }
+
+}