HttpClientUtils.java

package org.springboot.sample.util;

import java.util.Map;

import org.apache.commons.collections.MapUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpEntity;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;

/**
 *
 * 类功能说明：httpclient工具类,基于httpclient 4.x
 */
public class HttpClientUtils {

    private static final Logger LOGGER = LoggerFactory.getLogger(HttpClientUtils.class);

    /**
     * post请求
     * @param url
     * @param formParams
     * @return
     */
    public static String doPost(String url, Map<String, String> formParams) {
        if (MapUtils.isEmpty(formParams)) {
            return doPost(url);
        }

        try {
            MultiValueMap<String, String> requestEntity = new LinkedMultiValueMap<>();
            formParams.keySet().stream().forEach(key -> requestEntity.add(key, MapUtils.getString(formParams, key, "")));
            return RestClient.getClient().postForObject(url, requestEntity, String.class);
        } catch (Exception e) {
            LOGGER.error("POST请求出错：{}", url, e);
        }

        return null;
    }

    /**
     * post请求
     * @param url
     * @return
     */
    public static String doPost(String url) {
        try {
            return RestClient.getClient().postForObject(url, HttpEntity.EMPTY, String.class);
        } catch (Exception e) {
            LOGGER.error("POST请求出错：{}", url, e);
        }

        return null;
    }

    /**
     * get请求
     * @param url
     * @return
     */
    public static String doGet(String url) {
        try {
            return RestClient.getClient().getForObject(url, String.class);
        } catch (Exception e) {
            LOGGER.error("GET请求出错：{}", url, e);
        }

        return null;
    }

}