web-chat/src/main/java/com/uas/demo/api/FileController.java

package com.uas.demo.api;

import org.apache.commons.io.FilenameUtils;
import org.apache.log4j.Logger;
import org.springframework.core.io.FileSystemResource;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.util.UriComponentsBuilder;

import java.io.File;
import java.io.IOException;
import java.net.URI;

@RestController
@RequestMapping(value = "/api/utils/file")
public class FileController {

	private final Logger logger = Logger.getLogger(getClass());

	private RestTemplate restTemplate;

	public FileController() {
		this.restTemplate = new RestTemplate();
	}

	@RequestMapping(method = RequestMethod.POST)
	@ResponseStatus(HttpStatus.CREATED)
	public ResponseEntity<String> uploadFile(@RequestParam("file") MultipartFile file, UriComponentsBuilder ucb) {

		String fileUrl = "";
		try {
			File uploadFile = File.createTempFile("tmp", "." + FilenameUtils.getExtension(file.getOriginalFilename()));
			file.transferTo(uploadFile);

			FileSystemResource resource = new FileSystemResource(uploadFile);

			MultiValueMap<String, Object> param = new LinkedMultiValueMap<>();
			param.add("file", resource);
			fileUrl = restTemplate.postForObject("http://10.10.100.23:20070/file/part", param, String.class);
			uploadFile.deleteOnExit();
		} catch (IOException e) {
			e.printStackTrace();
		}

		HttpHeaders headers = new HttpHeaders();
		URI uri = ucb.replacePath(fileUrl)
				.build()
				.toUri();
		headers.setLocation(uri);

		logger.info(String.format("Upload file[%s]", fileUrl));

		return new ResponseEntity<>(fileUrl, headers, HttpStatus.CREATED);
	}
}