[java] [spring] Spring@ResponseBodyを利用して、HeaderとjsonStringを返す 　Access-Control-Allow-OriginをresponceHeaderに設定するために利用

AnyController.java

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;

import com.google.gson.JsonObject;

public class UploadController{

    @RequestMapping(value = "/upload")
  @ResponseBody
	public ResponseEntity<String> upload(@RequestParam("uploader") MultipartFile multipartFile)
			throws IllegalStateException, IOException {
		LOGGER.info("upload in multipart.");

		String filePath = "filepath/as/you/like"
		String fileName = multipartFile.getName();
		File file;

		// start logic
		if (!thread.isAlive()) {
			thread = new Thread(runner);
			thread.start();
		}

		try {
			file = new File(filePath, fileName);

			multipartFile.transferTo(file);
			LOGGER.info("execute transfer");
		} catch (Exception e) {
			e.printStacktrace();
			// TODO hundling
		}
		return createACAOAllResponce(ResultCode.SUCCESS, "upload successfully completed.");
	}

  private ResponseEntity<String> createACAOAllResponce(ResultCode resultCode, String message){
		JsonObject jsonObject = new JsonObject();
		jsonObject.addProperty("status", resultCode.getStatus());
		jsonObject.addProperty("msg", message);
		
		HttpHeaders responseHeaders = new HttpHeaders();
		responseHeaders.setContentType(MediaType.APPLICATION_JSON);
		responseHeaders.set("Access-Control-Allow-Origin", "*");
		return new ResponseEntity<String>(jsonObject.toString(), responseHeaders, HttpStatus.OK);
	}