引入的包为：
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<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient -->
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.8</version>
</dependency>
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实现的工具类为：
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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 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);
}
}
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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服务器之家。
原文链接：https://www.cnblogs.com/acm-bingzi/p/httpcomponents.html