HttpClients 采用multipart/form-data传参数

1、在post中请求案例

 2、类方法，可以直接拷过去使用

import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import java.io.IOException;
import java.util.*;


public class HttpUtils {

    public static String doPost(String url, HashMap map) throws Exception {
        String result = "";
        CloseableHttpClient client = null;
        CloseableHttpResponse response = null;
        RequestConfig defaultRequestConfig = RequestConfig.custom().setSocketTimeout(550000).setConnectTimeout(550000)
                .setConnectionRequestTimeout(550000).setStaleConnectionCheckEnabled(true).build();
        client = HttpClients.custom().setDefaultRequestConfig(defaultRequestConfig).build();
        URIBuilder uriBuilder = new URIBuilder(url);
        HttpPost httpPost = new HttpPost(uriBuilder.build());
        httpPost.setHeader("Connection", "Keep-Alive");
        httpPost.setHeader("Charset",  "UTF-8");
        httpPost.setHeader("Content-Type", "application/x-www-form-urlencoded");
        Iterator it = map.entrySet().iterator();
        List params = new ArrayList();
        while (it.hasNext()) {
            Map.Entry entry = (Map.Entry) it.next();
            NameValuePair pair = new BasicNameValuePair((String) entry.getKey(), (String) entry.getValue());
            params.add(pair);
        }
        httpPost.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
        try {
            response = client.execute(httpPost);
            if (response != null) {
                HttpEntity resEntity = response.getEntity();
                if (resEntity != null) {
                    result = EntityUtils.toString(resEntity,  "UTF-8");
                }
            }
        } catch (ClientProtocolException e) {
            throw new RuntimeException("创建连接失败" + e);
        } catch (IOException e) {
            throw new RuntimeException("创建连接失败" + e);
        }
        return result;
    }

}