Java httpcomponents发送get post请求代码实例

引入的包为：

<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient --><dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.5.8</version></dependency>

实现的工具类为：

import com.alibaba.fastjson.JSON;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.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.message.BasicNameValuePair;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import java.io.IOException;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;public class HttpClientHelper { private static Logger logger = LoggerFactory.getLogger(HttpClientHelper.class); private HttpClientHelper() { } /** * 发起POST请求 * * @param url url * @param paramMap 参数的Map格式 */ public static void sendPost(String url, Map<String, String> paramMap) { logger.info('开始发起POST请求，请求地址为{}，参数为{}', url, JSON.toJSON(paramMap)); CloseableHttpResponse response = null; try (CloseableHttpClient httpClient = HttpClients.createDefault()) { String encoding = 'utf-8'; //创建post请求对象 HttpPost httpPost = new HttpPost(url); //装填请求参数 List<NameValuePair> list = new ArrayList<>(); for (Map.Entry<String, String> entry : paramMap.entrySet()) {list.add(new BasicNameValuePair(entry.getKey(), entry.getValue())); } //设置参数到请求对象中 httpPost.setEntity(new UrlEncodedFormEntity(list, encoding)); httpPost.setHeader('Content-type', 'application/x-www-form-urlencoded'); httpPost.setHeader('User-Agent', 'Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)'); response = httpClient.execute(httpPost); } catch (IOException e) { logger.error('POST请求发出失败，请求的地址为{}，参数为{}，错误信息为{}', url, JSON.toJSON(paramMap), e.getMessage(), e); } finally { try {if (response != null) { response.close();} } catch (IOException e) {logger.error('POST请求response关闭异常，错误信息为{}', e.getMessage(), e); } } } /** * 发起GET请求 * * @param urlParam url请求，包含参数 */ public static void sendGet(String urlParam) { logger.info('开始发起GET请求，请求地址为{}', urlParam); HttpGet httpGet = new HttpGet(urlParam); CloseableHttpResponse response = null; try (CloseableHttpClient httpClient = HttpClients.createDefault()) { response = httpClient.execute(httpGet); int status = response.getStatusLine().getStatusCode(); logger.error('GET请求发出成功，请求的地址为{}，返回状态为{}', urlParam, status); } catch (IOException e) { logger.error('GET请求发出失败，请求的地址为{}，错误信息为{}', urlParam, e.getMessage(), e); } finally { try {if (response != null) { response.close();} } catch (IOException e) {logger.error('GET请求response关闭异常，错误信息为{}', e.getMessage(), e); } } } public static void main(String[] args) { String url = 'https://jiashubing.cn/tencenttest'; //需要传入的参数 Map<String, String> map = new HashMap<>(); map.put('code', 'js'); map.put('day', '0'); map.put('city', '北京'); map.put('dfc', '1'); map.put('charset', 'utf-8'); sendPost(url, map); String urlParam = 'https://jiashubing.cn/talk/document?fileid=1234ji贾树丙'; sendGet(urlParam); }}

如果POST请求想要发送Json 格式的数据，只需要修改成这样：

String json = JSON.toJSONString(paramMap);StringEntity requestEntity = new StringEntity(json, 'utf-8');httpPost.setEntity(requestEntity);

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持好吧啦网。