java post请求参数为文件

话不多说上代码

import org.apache.https.Consts;
import org.apache.https.HttpEntity;
import org.apache.https.HttpResponse;
import org.apache.https.HttpStatus;
import org.apache.https.client.config.RequestConfig;
import org.apache.https.client.methods.HttpPost;
import org.apache.https.entity.ContentType;
import org.apache.https.entity.mime.HttpMultipartMode;
import org.apache.https.entity.mime.MultipartEntityBuilder;
import org.apache.https.entity.mime.content.StringBody;
import org.apache.https.impl.client.CloseableHttpClient;
import org.apache.https.impl.client.HttpClients;
import org.apache.https.util.EntityUtils;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.Map;

public class HttpFileUtil {
    /**
     * 以post方式调用第三方接口,以form-data 形式  发送 MultipartFile 文件数据
     * @param url  post请求url
     * @param fileParamName 文件参数名称
     * @param multipartFile  文件
     */
    public static String doPostFormData(String url, String fileParamName, MultipartFile multipartFile, Map<String, String> paramMap) {
        // 创建Http实例
        CloseableHttpClient httpsClient = HttpClients.createDefault();
        // 创建HttpPost实例
        HttpPost httpsPost = new HttpPost(url);
        // 请求参数配置
        RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(60000).setConnectTimeout(60000)
                .setConnectionRequestTimeout(10000).build();
        httpsPost.setConfig(requestConfig);
        try {
            MultipartEntityBuilder builder = MultipartEntityBuilder.create();
            builder.setCharset(StandardCharsets.UTF_8);
            builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
            String fileName = multipartFile.getOriginalFilename();
            // 文件流
            builder.addBinaryBody(fileParamName, multipartFile.getInputStream(), ContentType.MULTIPART_FORM_DATA, fileName);
            //表单中其他参数，如果没有其他参数可以注释该部分
            for(Map.Entry<String, String> entry: paramMap.entrySet()) {
                builder.addPart(entry.getKey(),new StringBody(entry.getValue(), ContentType.create("text/plain", Consts.UTF_8)));
            }
            HttpEntity entity = builder.build();
            httpsPost.setEntity(entity);
            // 执行提交
            HttpResponse response = httpsClient.execute(httpsPost);
            if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                // 返回
                String res = EntityUtils.toString(response.getEntity(), StandardCharsets.UTF_8);
                return res;
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (httpsClient != null) {
                try {
                    httpsClient.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return null;
    }
}