根据 url 执行请求，并返回结果。

前提依赖

后续完善：）

核心代码

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.google.common.collect.Maps;
import net.super0.sellbox.meta.entity.constant.ResponseResult;
import org.apache.commons.lang3.StringUtils;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
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.utils.URIBuilder;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cglib.beans.BeanMap;
import org.springframework.stereotype.Service;
import java.io.IOException;
import java.net.URISyntaxException;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
@Service
public class HttpRemoteService {
    private static final Logger logger = LoggerFactory.getLogger(HttpRemoteService.class);
    private static final String DEFAULT_ENCODE = "UTF-8";
    private static final String DEFAULT_CONTENT_TYPE = "application/json";
    @Autowired
    private CloseableHttpClient httpClient;
}

处理 Get 请求

    /**
     * GET请求处理器
     *
     * @param url    地址
     * @param header 请求头
     * @param param  请求参数
     * @param clazz  返回类型
     * @param <T>
     * @return
     */
    public <T> T executeGet(String url, Map<String, String> header, Map<String, Object> param, Class<T> clazz) {
        T responseResult = null;
        CloseableHttpResponse response = null;
        try {
            URIBuilder uriBuilder = new URIBuilder(url);
            if (param != null) {
                for (Map.Entry<String, Object> entry : param.entrySet()) {
                    uriBuilder.setParameter(entry.getKey(), entry.getValue().toString());
                }
            }
            HttpGet httpGet = new HttpGet(uriBuilder.build());
            if (header != null && header.size() > 0) {
                header.forEach(httpGet::addHeader);
            }
            log.info("http get 请求url:{}, param:{}", httpGet.getURI(), param);
            response = httpClient.execute(httpGet);
            String result = EntityUtils.toString(response.getEntity(), Charset.forName(DEFAULT_ENCODE));
//            log.info("http get 返回原始值 result:{}", result);
            if (StringUtils.isNotEmpty(result)) {
                responseResult = JSON.parseObject(result, clazz);
            }
        } catch (Exception e) {
            log.error("executeGet error", e);
        } finally {
            if (response != null) {
                EntityUtils.consumeQuietly(response.getEntity());
            }
        }
        return responseResult;
    }

处理 Post 请求

    /**
     * POST请求处理器
     *
     * @param url       地址
     * @param header    请求头
     * @param paramMap  请求参数
     * @param jsonParam 请求体
     * @param clazz     返回的类型
     * @param <T>
     * @return
     */
    public <T> T executePost(String url, Map<String, String> header, Map<String, Object> paramMap, JSONObject jsonParam,
                             Class<T> clazz) {
        CloseableHttpResponse response = null;
        T responseResult = null;
        try {
            URIBuilder uriBuilder = new URIBuilder(url);
            // 判断请求参数不为空
            if (paramMap != null) {
                for (Map.Entry<String, Object> entry : paramMap.entrySet()) {
                    uriBuilder.setParameter(entry.getKey(), entry.getValue().toString());
                }
            }
            // 声明httpPost请求
            HttpPost httpPost = new HttpPost(uriBuilder.build());
            // 判断请求头不为空
            if (header != null && header.size() > 0) {
                header.forEach(httpPost::addHeader);
            }
            // 判断请求体不为空
            if (jsonParam != null) {
                StringEntity entity = new StringEntity(jsonParam.toJSONString(), DEFAULT_ENCODE);
                entity.setContentEncoding(DEFAULT_ENCODE);
                entity.setContentType(DEFAULT_CONTENT_TYPE);
                httpPost.setEntity(entity);
            }
            // 使用HttpClient发起请求，返回response
            response = httpClient.execute(httpPost);
            if (response == null) {
                return null;
            }
            String result = EntityUtils.toString(response.getEntity(), Charset.forName(DEFAULT_ENCODE));
            if (StringUtils.isNotEmpty(result)) {
                responseResult = JSON.parseObject(result, clazz);
            }
        } catch (Exception e) {
            log.error("executePost error", e);
        } finally {
            if (response != null) {
                EntityUtils.consumeQuietly(response.getEntity());
            }
        }
        // 返回结果
        return responseResult;
    }

GET 获取字节流

    /**
     * http get 方法获取字节流
     *
     * @param url
     * @return
     */
    public byte[] executeGetForBytes(String url) {
        byte[] result = null;
        CloseableHttpResponse response = null;
        try {
            URIBuilder uriBuilder = new URIBuilder(url);
            HttpGet httpGet = new HttpGet(uriBuilder.build());
            response = httpClient.execute(httpGet);
            result = EntityUtils.toByteArray(response.getEntity());
        } catch (Exception e) {
            logger.error("executeGet error", e);
        } finally {
            if (response != null) {
                EntityUtils.consumeQuietly(response.getEntity());
            }
        }
        return result;
    }

将对象转换为字节流

    /**
     * 将对象装换为map
     *
     * @param bean
     * @return
     */
    private <T> Map<String, Object> beanToMap(T bean) {
        Map<String, Object> map = Maps.newHashMap();
        if (bean != null) {
            BeanMap beanMap = BeanMap.create(bean);
            for (Object key : beanMap.keySet()) {
                map.put(key + "", beanMap.get(key));
            }
        }
        return map;
    }