使用HttpClient发送post和get请求三方接口

最近在用到了HttpClient发送post和get请求三方接口的需求，所以写了个封装类方便以后用到：

需要用到的一些jar的maven坐标：

		<dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.5</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.7</version>
        </dependency>

        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.11</version>
        </dependency>

HttpUtil封装类：

package com.springboot.demo.test.service;

import com.alibaba.fastjson.JSON;
import org.apache.commons.lang3.StringUtils;
import org.apache.http.HttpStatus;
import org.apache.http.client.config.RequestConfig;
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.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.CollectionUtils;
import java.io.IOException;
import java.util.Map;

public class HttpUtil {
    private static final Logger logger = LoggerFactory.getLogger(HttpUtil.class);
    private static RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(60000).setConnectTimeout(60000).build();
    private static String chaset = "UTF-8";    // 默认编码

    /**
     * 发送 GET 请求（HTTP），无参数
     * @param url
     * @return
     */
    public static String doGet(String url) {
        if (StringUtils.isBlank(url)) {
            return "url不能为空";
        }
        // 创建http GET请求
        logger.info("url:{}", url);
        HttpGet httpGet = new HttpGet(url);
        // 设置请求和传输超时时间
        httpGet.setConfig(requestConfig);
        String result = "";
        try (CloseableHttpClient httpclient = HttpClients.createDefault();// 创建Httpclient对象
             CloseableHttpResponse response = httpclient.execute(httpGet);// 执行请求
        ) {
            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode == HttpStatus.SC_OK) {
                result = EntityUtils.toString(response.getEntity(), chaset);
                logger.info("HttpGet方式请求成功！返回结果：{}", result);
            } else {
                logger.info("HttpGet方式请求失败！状态码:" + statusCode);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 发送 GET 请求（HTTP），有参数
     * @param url
     * @param params
     * @return
     */
    public static String doGet(String url, Map<String, Object> params) {
        if (!CollectionUtils.isEmpty(params)) {
            StringBuffer extraUrl = new StringBuffer();
            int temp = 0;
            for (String key : params.keySet()) {
                if (temp == 0) {
                    extraUrl.append("?");
                } else {
                    extraUrl.append("&");
                }
                extraUrl.append(key).append("=").append(params.get(key));
                temp++;
            }
            url += extraUrl;
        }
        return doGet(url);
    }

    /**
     * 发送 POST 请求（HTTP），无参数
     * @param url
     * @return
     */
    public static String doPost(String url) {
        return doPost(url, null);
    }

    /**
     * 发送 POST 请求（HTTP），有参数
     * @param url
     * @return
     */
    public static String doPost(String url, Map<String, Object> params) {
        // 创建http POST请求
        HttpPost httpPost = new HttpPost(url);
        httpPost.setConfig(requestConfig);
        httpPost.setHeader("Content-Type", "application/json");
        if (params != null) {
            httpPost.setEntity(new StringEntity(JSON.toJSONString(params), ContentType.create("application/json", "utf-8")));
        }
        String result = "";
        try (CloseableHttpClient httpclient = HttpClients.createDefault();// 创建Httpclient对象
             CloseableHttpResponse response = httpclient.execute(httpPost);// 执行请求
        ) {
            logger.info("httpPost:{}", httpPost);
            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode == HttpStatus.SC_OK) {
                result = EntityUtils.toString(response.getEntity(), chaset);
                logger.info("HttpPost方式请求成功！返回结果：{}", result);
            } else {
                logger.info("HttpPost方式请求失败！状态码:" + statusCode);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }
}

用的时候直接调用就行，如：

Map<String, Object> map = new HashMap<>();
map.put("a", additionModel.getA());
map.put("b", additionModel.getB());
String result = HttpUtil.doGet("http://125.113.27.170:8080/query/v1/addition",map);

本文地址：https://blog.csdn.net/qq_33697094/article/details/110820690