分享一个http请求工具类，如果觉得有用就试试吧

以下为http工具类代码

package com.cy.xgsm.util;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;

import org.apache.http.client.methods.CloseableHttpResponse;
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;



/**
 * http工具类
 * @author Dylan
 * @create 2022/5/13 11:33
 *
 */
public class HttpUtil {
	
	private static final Logger log = LoggerFactory.getLogger(HttpUtil.class);
	
	public static String sendPost(String url, String data) {
		try {
			CloseableHttpClient httpclient = null;
			CloseableHttpResponse httpresponse = null;
			try {
				httpclient = HttpClients.createDefault();
				HttpPost httppost = new HttpPost(url);
				 StringEntity stringentity = new StringEntity(URLEncoder.encode(data,"utf-8"),
				 ContentType.create("text/json", "UTF-8"));
				httppost.setEntity(stringentity);
				httpresponse = httpclient.execute(httppost);
				String response = EntityUtils
						.toString(httpresponse.getEntity());
				log.info("response: " + response);
				return response;		
			} finally {
				if (httpclient != null) {
					httpclient.close();
				}
				if (httpresponse != null) {
					httpresponse.close();
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
	
	public static String sendPost(String url, String appkey, String sessionkey,
			String secret, String version, String method, String data) {
		StringBuffer requestContent = new StringBuffer();
		requestContent.append("appkey=");
		requestContent.append(appkey);
		requestContent.append("&sessionkey=");
		requestContent.append(sessionkey);
		requestContent.append("&sign=");
		requestContent.append(SignUtil.sign(data, secret));
		requestContent.append("&version=");
		requestContent.append(version);
		requestContent.append("&method=");
		requestContent.append(method);
		requestContent.append("&data=");
		try {
			requestContent.append(URLEncoder.encode(data, "UTF-8"));
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		try {
			CloseableHttpClient httpclient = null;
			CloseableHttpResponse httpresponse = null;
			try {
				httpclient = HttpClients.createDefault();
				HttpPost httppost = new HttpPost(url);
				StringEntity stringentity = new StringEntity(
						requestContent.toString(), ContentType.create(
								"text/plain", "UTF-8"));
				httppost.setEntity(stringentity);
				httpresponse = httpclient.execute(httppost);
				String response = EntityUtils
						.toString(httpresponse.getEntity());
				log.info("response: " + response);
				return response;
			} finally {
				if (httpclient != null) {
					httpclient.close();
				}
				if (httpresponse != null) {
					httpresponse.close();
				}
			}
		} catch (Exception e) {			
			e.printStackTrace();
		}
		return null;
	}
    /**
     * 发送post请求
     * @param url 目的url
     * @param parameters 参数
     * @return
     */
    public static String post(String url, Map<String, String> parameters) {
    	String result = "";// 返回的结果
    	BufferedReader in = null;// 读取响应输入流
    	PrintWriter out = null;
    	StringBuffer sb = new StringBuffer();// 处理请求参数
    	String params = "";// 编码之后的参数
    	try {
    	// 编码请求参数
    	if (parameters.size() == 1) {
    	for (String name : parameters.keySet()) {
    	sb.append(name)
    	.append("=")
    	.append(java.net.URLEncoder.encode(
    	parameters.get(name), "UTF-8"));
    	}
    	params = sb.toString();
    	} else {
    	for (String name : parameters.keySet()) {
    	sb.append(name)
    	.append("=")
    	.append(java.net.URLEncoder.encode(
    	parameters.get(name), "UTF-8")).append("&");
    	}
    	String temp_params = sb.toString();
    	params = temp_params.substring(0, temp_params.length() - 1);
    	}
    	// 创建URL对象
    	java.net.URL connURL = new java.net.URL(url);
    	// 打开URL连接
    	java.net.HttpURLConnection httpConn = (java.net.HttpURLConnection) connURL
    	.openConnection();
    	// 设置通用属性
    	httpConn.setRequestProperty("Accept", "*/*");
    	httpConn.setRequestProperty("Connection", "Keep-Alive");
    	httpConn.setRequestProperty("content-type", "application/x-www-form-urlencoded");
    	httpConn.setRequestProperty("User-Agent",
    	"Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1)");
    	// 设置POST方式
    	httpConn.setDoInput(true);
    	httpConn.setDoOutput(true);
    	// 获取HttpURLConnection对象对应的输出流
    	out = new PrintWriter(httpConn.getOutputStream());
    	// 发送请求参数
    	out.write(params);
    	// flush输出流的缓冲
    	out.flush();
    	// 定义BufferedReader输入流来读取URL的响应，设置编码方式
    	in = new BufferedReader(new InputStreamReader(
    	httpConn.getInputStream(), "UTF-8"));
    	String line;
    	// 读取返回的内容
    	while ((line = in.readLine()) != null) {
    	result += line;
    	}
    	} catch (Exception e) {
    	e.printStackTrace();

    	} finally {
    	try {
    	if (out != null) {
    	out.close();
    	}
    	if (in != null) {
    	in.close();
    	}
    	} catch (IOException ex) {
    	ex.printStackTrace();
    	}
    	}
    	return result;
    }
}

以下为我使用的pom依赖

<dependency>
			<groupId>commons-httpclient</groupId>
			<artifactId>commons-httpclient</artifactId>
			<version>3.1</version>
		</dependency>
		
		<dependency>
			<groupId>org.apache.httpcomponents</groupId>
			<artifactId>httpclient</artifactId>
		</dependency>