java封装httpClient工具（支持http和https，包含get和post请求）

网上有关方法非常多，但相对较零散，有些只支持http或https中的一种，或者只有get或post中的一种。以下对httpclient工具做了比较全面的封装，支持http和https，包含get和post请求。

maven导入的jar包有：

<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.5</version>
</dependency>
<!--阿里 FastJson依赖 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.37</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpasyncclient</artifactId>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpmime</artifactId>
</dependency>

代码：

import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;
import java.security.GeneralSecurityException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;

import org.apache.commons.io.IOUtils;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.config.RequestConfig;
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.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.conn.ssl.TrustStrategy;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.ssl.SSLContextBuilder;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject; 
import com.core.ServiceException;     //自定义的一个异常类。

public class HttpsUtils {
	private static PoolingHttpClientConnectionManager	connMgr;
	private static RequestConfig				requestConfig;
	private static final int				MAX_TIMEOUT	= 7000;

	private static final Logger				logger		= LoggerFactory.getLogger(HttpsUtils.class);

	static {
		// 设置连接池
		connMgr = new PoolingHttpClientConnectionManager();
		// 设置连接池大小
		connMgr.setMaxTotal(100);
		connMgr.setDefaultMaxPerRoute(connMgr.getMaxTotal());
		// Validate connections after 1 sec of inactivity
		connMgr.setValidateAfterInactivity(1000);
		RequestConfig.Builder configBuilder = RequestConfig.custom();
		// 设置连接超时
		configBuilder.setConnectTimeout(MAX_TIMEOUT);
		// 设置读取超时
		configBuilder.setSocketTimeout(MAX_TIMEOUT);
		// 设置从连接池获取连接实例的超时
		configBuilder.setConnectionRequestTimeout(MAX_TIMEOUT);

		requestConfig = configBuilder.build();
	}

	/**
	 * 发送 GET 请求（HTTP），不带输入数据
	 * 
	 * @param url
	 * @return
	 */
	public static JSONObject doGet(String url) {
		return doGet(url, new HashMap<String, Object>());
	}

	/**
	 * 发送 GET 请求（HTTP），K-V形式
	 * 
	 * @param url
	 * @param params
	 * @return
	 */
	public static JSONObject doGet(String url, Map<String, Object> params) {
		String apiUrl = url;
		StringBuffer param = new StringBuffer();
		int i = 0;
		for (String key : params.keySet()) {
			if (i == 0)
				param.append("?");
			else
				param.append("&");
			param.append(key).append("=").append(params.get(key));
			i++;
		}
		apiUrl += param;
		String result = null;
		HttpClient httpClient = null;
		if (apiUrl.startsWith("https")) {
			httpClient = HttpClients.custom().setSSLSocketFactory(createSSLConnSocketFactory())
					.setConnectionManager(connMgr).setDefaultRequestConfig(requestConfig).build();
		} else {
			httpClient = HttpClients.createDefault();
		}
		try {
			HttpGet httpGet = new HttpGet(apiUrl);
			HttpResponse response = httpClient.execute(httpGet);
			HttpEntity entity = response.getEntity();
			if (entity != null) {
				InputStream instream = entity.getContent();
				result = IOUtils.toString(instream, "UTF-8");
			}
		} catch (IOException e) {
			LoggerUtils.error(logger, e, e.getMessage());
			throw new ServiceException(e.getMessage());
		}
		return JSON.parseObject(result);
	}

	/**
	 * 发送 POST 请求（HTTP），不带输入数据
	 * 
	 * @param apiUrl
	 * @return
	 */
	public static JSONObject doPost(String apiUrl) {
		return doPost(apiUrl, new HashMap<String, Object>());
	}

	/**
	 * 发送 POST 请求，K-V形式
	 * 
	 * @param apiUrl
	 *            API接口URL
	 * @param params
	 *            参数map
	 * @return
	 */
	public static JSONObject doPost(String apiUrl, Map<String, Object> params) {
		CloseableHttpClient httpClient = null;
		if (apiUrl.startsWith("https")) {
			httpClient = HttpClients.custom().setSSLSocketFactory(createSSLConnSocketFactory())
					.setConnectionManager(connMgr).setDefaultRequestConfig(requestConfig).build();
		} else {
			httpClient = HttpClients.createDefault();
		}
		String httpStr = null;
		HttpPost httpPost = new HttpPost(apiUrl);
		CloseableHttpResponse response = null;

		try {
			httpPost.setConfig(requestConfig);
			List<NameValuePair> pairList = new ArrayList<>(params.size());
			for (Map.Entry<String, Object> entry : params.entrySet()) {
				NameValuePair pair = new BasicNameValuePair(entry.getKey(), entry.getValue().toString());
				pairList.add(pair);
			}
			httpPost.setEntity(new UrlEncodedFormEntity(pairList, Charset.forName("UTF-8")));
			response = httpClient.execute(httpPost);
			HttpEntity entity = response.getEntity();
			httpStr = EntityUtils.toString(entity, "UTF-8");
		} catch (IOException e) {
			LoggerUtils.error(logger, e, e.getMessage());
			throw new ServiceException(e.getMessage());
		} finally {
			if (response != null) {
				try {
					EntityUtils.consume(response.getEntity());
				} catch (IOException e) {
					LoggerUtils.error(logger, e, e.getMessage());
					throw new ServiceException(e.getMessage());
				}
			}
		}
		return JSON.parseObject(httpStr);
	}

	/**
	 * 发送 POST 请求，JSON形式
	 * 
	 * @param apiUrl
	 * @param json
	 *            json对象
	 * @return
	 */
	public static JSONObject doPost(String apiUrl, Object json) {
		CloseableHttpClient httpClient = null;
		if (apiUrl.startsWith("https")) {
			httpClient = HttpClients.custom().setSSLSocketFactory(createSSLConnSocketFactory())
					.setConnectionManager(connMgr).setDefaultRequestConfig(requestConfig).build();
		} else {
			httpClient = HttpClients.createDefault();
		}
		String httpStr = null;
		HttpPost httpPost = new HttpPost(apiUrl);
		CloseableHttpResponse response = null;

		try {
			httpPost.setConfig(requestConfig);
			StringEntity stringEntity = new StringEntity(json.toString(), "UTF-8");// 解决中文乱码问题
			stringEntity.setContentEncoding("UTF-8");
			stringEntity.setContentType("application/json");
			httpPost.setEntity(stringEntity);
			response = httpClient.execute(httpPost);
			HttpEntity entity = response.getEntity();
			httpStr = EntityUtils.toString(entity, "UTF-8");
		} catch (IOException e) {
			LoggerUtils.error(logger, e, e.getMessage());
			throw new ServiceException(e.getMessage());
		} finally {
			if (response != null) {
				try {
					EntityUtils.consume(response.getEntity());
				} catch (IOException e) {
					LoggerUtils.error(logger, e, e.getMessage());
					throw new ServiceException(e.getMessage());
				}
			}
		}
		return JSON.parseObject(httpStr);
	}

	/**
	 * 创建SSL安全连接
	 * 
	 * @return
	 */
	private static SSLConnectionSocketFactory createSSLConnSocketFactory() {
		SSLConnectionSocketFactory sslsf = null;
		try {
			SSLContext sslContext = new SSLContextBuilder().loadTrustMaterial(null, new TrustStrategy() {

				public boolean isTrusted(X509Certificate[] chain, String authType) throws CertificateException {
					return true;
				}
			}).build();
			sslsf = new SSLConnectionSocketFactory(sslContext, new HostnameVerifier() {

				@Override
				public boolean verify(String arg0, SSLSession arg1) {
					return true;
				}
			});
		} catch (GeneralSecurityException e) {
			LoggerUtils.error(logger, e, e.getMessage());
			throw new ServiceException(e.getMessage());
		}
		return sslsf;
	}
}