使用Java调用Http接口（post，get）

package com.xiaocaimi.open.common.util;

import com.alibaba.fastjson.JSONObject;
import lombok.extern.slf4j.Slf4j;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

import java.io.IOException;
import java.nio.charset.Charset;

@Slf4j
public class HttpUtil {

    public static String get(String url) {
        String body = null;
        try (CloseableHttpClient httpClient = HttpClientBuilder.create().build()) {
            log.info("create httppost:" + url);
            HttpGet get = new HttpGet(url);
            get.addHeader("Accept-Charset","utf-8");
            HttpResponse response = sendRequest(httpClient, get);
            body = parseResponse(response);
        } catch (IOException e) {
            log.error("send post request failed: {}", e.getMessage());
        }

        return body;
    }


    private static HttpResponse sendRequest(CloseableHttpClient httpclient, HttpUriRequest httpost)
            throws ClientProtocolException, IOException {
        HttpResponse response = null;
        response = httpclient.execute(httpost);
        return response;
    }

    private static String parseResponse(HttpResponse response) {
        log.info("get response from http server..");
        HttpEntity entity = response.getEntity();

        log.info("response status: " + response.getStatusLine());
        Charset charset = ContentType.getOrDefault(entity).getCharset();
        if (charset != null) {
            log.info(charset.name());
        }

        String body = null;
        try {
            body = EntityUtils.toString(entity, "utf-8");
            log.info("body " + body);
        } catch (IOException e) {
            log.warn("{}: cannot parse the entity", e.getMessage());
        }

        return body;
    }

    public static String doPost(String url, JSONObject json){
        // 创建httpclient对象
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpPost post = new HttpPost(url);
        CloseableHttpResponse response = null;
        try {
            //StringEntity reqEntity = new StringEntity(params,"utf-8");
            StringEntity entity = new StringEntity(json.toString(),"utf-8");
            //entity.setContentEncoding("UTF-8");
            entity.setContentType("application/json"); // 发送json数据需要设置contentType
            post.setEntity(entity);
            response = httpClient.execute(post);
            if(response.getStatusLine().getStatusCode() == HttpStatus.SC_OK){
                // 返回json格式
                return EntityUtils.toString(response.getEntity());
            }
        } catch (Exception e) {
            log.error("通讯异常，异常信息:[{}]", e);
        }
        finally {
            if (httpClient != null) {
                try {
                    httpClient.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (response != null){
                try {
                    response.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return null;
    }

}