import org.apache.http.Consts;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.entity.mime.content.StringBody;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.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方式呼叫第三方介面,以form-data 形式  傳送 MultipartFile 檔案資料
     * @param url  post請求url
     * @param fileParamName 檔案引數名稱
     * @param multipartFile  檔案
     */
    public static String doPostFormData(String url, String fileParamName, MultipartFile multipartFile, Map<String, String> paramMap) {
        // 建立Http例項
        CloseableHttpClient httpClient = HttpClients.createDefault();
        // 建立HttpPost例項
        HttpPost httpPost = new HttpPost(url);
        // 請求引數配置
        RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(60000).setConnectTimeout(60000)
                .setConnectionRequestTimeout(10000).build();
        httpPost.setConfig(requestConfig);
        try {
            MultipartEntityBuilder builder = MultipartEntityBuilder.create();
            builder.setCharset(StandardCharsets.UTF_8);
            builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
            String fileName = multipartFile.getOriginalFilename();
            // 檔案流
            builder.addBinaryBody(fileParamName, multipartFile.getInputStream(), ContentType.MULTIPART_FORM_DATA, fileName);
            //表單中其他引數，如果沒有其他引數可以註釋該部分
            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();
            httpPost.setEntity(entity);
            // 執行提交
            HttpResponse response = httpClient.execute(httpPost);
            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 (httpClient != null) {
                try {
                    httpClient.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return null;
    }
}