RestTemplate 调用 MultipartFile

package com.wind.service;

import com.wind.entity.CommonDto;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.io.ByteArrayResource;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
import org.springframework.stereotype.Service;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.multipart.MultipartFile;
import java.io.IOException;
import java.util.LinkedHashMap;

/**
 * @Author
 * @Classname UploadService
 * @Description 调用第三方获取可访问的url
 *         注意点的：1. contentType   multipart/form-data
 *                 2. 用原生的或者spring的 RestTemplate
 *                 3. MultipartFile 不可以序列化 （可能会包json 解析异常）
 * @Date 2021/3/11 22:32
 * @Created by windBird
 */
@Service
public class UploadService {

    @Autowired
    private RestTemplate restTemplate;

    @Value("{$third.item.url}")
    private String baseUrl;


    /**
     * 文件流 + 注入 RestTemplate +multipart/form-data
     * @param image
     * @return
     * @Description 调用第三方 获取可访问的 URL 第三方接受的参数类型  MultipartFile
     */
    public String getImageUrl(MultipartFile image) {
        String openImageUrl = "";
        LinkedMultiValueMap param = new LinkedMultiValueMap<>();
        param.add("file", image.getResource());
        HttpHeaders httpHeaders = new HttpHeaders();
        httpHeaders.setContentType(MediaType.parseMediaType("multipart/form-data"));
        HttpEntity upParam = new HttpEntity<>(param, httpHeaders);
        String url = baseUrl + "/uploadImage";
        CommonDto resultData = restTemplate.postForEntity(url, upParam, CommonDto.class).getBody();
        if (null != resultData) {
            LinkedHashMap<String, Object> linkedHashMap = (LinkedHashMap<String, Object>) resultData.getData();
            openImageUrl = String.valueOf(linkedHashMap.get("fileUrl"));
        }
        return openImageUrl;
    }

    /**
     *  数组流+ new RestTemplate + multipart/form-data
     * @param image
     * @return
     * @throws IOException
     */
    public String getUrlByArrayByte(MultipartFile image) throws IOException {
        String openImageUrl = "";
        ByteArrayResource arrayResource = new ByteArrayResource(image.getBytes()) {
            @Override
            public String getFilename() {
                return image.getOriginalFilename();  //必须要重写路径
            }
        };
        LinkedMultiValueMap param = new LinkedMultiValueMap<>();
        param.add("file", arrayResource);
        HttpHeaders httpHeaders = new HttpHeaders();
        httpHeaders.setContentType(MediaType.parseMediaType("multipart/form-data"));
        HttpEntity upParam = new HttpEntity<>(param, httpHeaders);
        RestTemplate restTemplate = new RestTemplate(new HttpComponentsClientHttpRequestFactory());
        String url = baseUrl + "/uploadImage";
        CommonDto resultData = restTemplate.postForEntity(url, upParam, CommonDto.class).getBody();
        if (null != resultData) {
            LinkedHashMap<String, Object> linkedHashMap = (LinkedHashMap<String, Object>) resultData.getData();
            openImageUrl = String.valueOf(linkedHashMap.get("fileUrl"));
        }
        return openImageUrl;
    }
}