Ednpoint para obtener traducciones de un archivo en formato JSON para otro properties

example-translate.java

@CrossOrigin
@RestController
@RequestMapping("/api/example")
public class Exampleresource {

	@GetMapping(path = "/translate", produces = MediaType.APPLICATION_JSON_VALUE)
	public ResponseEntity<String> translate() {
		// String result = "Ok";
		String file1Path = "src/main/resources/transfile1.txt";
		String file2Path = "src/main/resources/transfile2.txt";

		LinkedHashMap<String, String> mapFile1 = new LinkedHashMap<>();
		Map<String, String> mapFile2 = new HashMap<>();
		
		Gson gson = new Gson();

		// Cargar propiedades del primer archivo
		try (FileInputStream fis = new FileInputStream(file1Path)) {
			byte[] data = fis.readAllBytes();
			String json = new String(data, StandardCharsets.UTF_8);
			String[] lines = json.split("\\r?\\n");
			// Recorrer cada línea
			for (String line : lines) {
				if (line.contains("=")) {
					String[] lineParts = line.split("=");
					mapFile1.put(lineParts[0], lineParts[1]);
				}
			}
		} catch (Exception e) {
			return ResponseEntityUtil.errorResponse(e.getMessage());
		}

		// Cargar propiedades del segundo archivo (JSON)
		try (FileInputStream fis = new FileInputStream(file2Path)) {
			byte[] data = fis.readAllBytes();
			String json = new String(data, StandardCharsets.UTF_8);
			Type type = new TypeToken<Map<String, String>>(){}.getType();
			mapFile2 = gson.fromJson(json, type);
		} catch (Exception e) {
			return ResponseEntityUtil.errorResponse(e.getMessage());
		}

		for (Map.Entry<String, String> entry : mapFile1.entrySet()) {
			if (mapFile2.containsKey(entry.getValue())) {
				mapFile1.put(entry.getKey(), mapFile2.get(entry.getValue()));
			}
		}

		// Guardar los cambios en el primer archivo
		try (OutputStreamWriter writer = new OutputStreamWriter(new FileOutputStream(file1Path), StandardCharsets.UTF_8)) {
			for (Map.Entry<String, String> entry : mapFile1.entrySet()) {
				String line = entry.getKey() + "=" + entry.getValue() + "\n";
				writer.write(line);
			}
		} catch (IOException e) {
			return ResponseEntityUtil.errorResponse(e.getMessage());
		}

		logger.info("Translate ok...");
		return ResponseEntityUtil.objectResponse(mapFile1.toString());
	}
	
}