src/main/java/com/organization/controller/PostController.java - master - itokar98/HomeWorkJSPRServlets

src/main/java/com/organization/controller/PostController.java
67 строк2 KB
Ilya Tokar
first_commit
14 янв 2026, 01:32
14 янв 2026, 01:32a683d55
package com.organization.controller;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.organization.model.Post;
import com.organization.service.PostService;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.Reader;
import java.io.Writer;

public class PostController {
    private static final Gson GSON = new GsonBuilder().create();
    private static final String CONTENT_TYPE_JSON = "application/json";

    private final PostService service;

    public PostController(PostService service) {
        this.service = service;
    }

    public void all(HttpServletResponse response) throws IOException {
        setJsonResponse(response);
        final var data = service.all();
        writeJson(response, data);
    }

    public void getById(long id, HttpServletResponse response) throws IOException {
        setJsonResponse(response);
        try {
            final var post = service.getById(id);
            writeJson(response, post);
        } catch (Exception e) {
            response.setStatus(HttpServletResponse.SC_NOT_FOUND);
            response.getWriter().write("{\"error\": \"Post not found\"}");
        }
    }

    public void save(Reader body, HttpServletResponse response) throws IOException {
        setJsonResponse(response);
        final var post = GSON.fromJson(body, Post.class);
        final var saved = service.save(post);
        writeJson(response, saved);
    }

    public void removeById(long id, HttpServletResponse response) throws IOException {
        try {
            service.removeById(id);
            response.setStatus(HttpServletResponse.SC_NO_CONTENT); // 204 — удалён успешно
        } catch (Exception e) {
            response.setStatus(HttpServletResponse.SC_NOT_FOUND);
            response.getWriter().write("{\"error\": \"Post not found\"}");
        }
    }

    private void setJsonResponse(HttpServletResponse response) {
        response.setContentType(CONTENT_TYPE_JSON);
        response.setCharacterEncoding("UTF-8");
    }

    private void writeJson(HttpServletResponse response, Object data) throws IOException {
        try (Writer writer = response.getWriter()) {
            GSON.toJson(data, writer);
        }
    }
}