分享一个用HttpClient 实现的post和get请求的工具类

package com.example.demo.util;

import java.io.IOException;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import javax.net.ssl.SSLContext;
import javax.net.ssl.X509TrustManager;

import org.apache.commons.beanutils.ConvertUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.http.HttpEntity;
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.config.Registry;
import org.apache.http.config.RegistryBuilder;
import org.apache.http.conn.socket.ConnectionSocketFactory;
import org.apache.http.conn.socket.PlainConnectionSocketFactory;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
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.util.EntityUtils;
import org.springframework.util.Assert;

public class HttpClientHelper {

	public static String post(String url, Map<String, Object> parameterMap) {
		Assert.hasText(url, "");
		String result = null;
		CloseableHttpResponse httpResponse = null;
		// 设置协议http和https对应的处理socket链接工厂的对象
		CloseableHttpClient httpClient =null;  
		try {
			httpClient=createHttpClient();
			HttpPost httpPost = new HttpPost(url);
			List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
			if (parameterMap != null) {
				for (Entry<String, Object> entry : parameterMap.entrySet()) {
					String name = entry.getKey();
					String value = ConvertUtils.convert(entry.getValue());
					if (StringUtils.isNotEmpty(name)) {
						nameValuePairs.add(new BasicNameValuePair(name, value));
					}
				}
			}
			httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs, "UTF-8"));
			httpResponse = httpClient.execute(httpPost);
			HttpEntity httpEntity = httpResponse.getEntity();
			result = EntityUtils.toString(httpEntity, "UTF-8");
			EntityUtils.consume(httpEntity);
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				if(httpResponse!=null) {
					httpResponse.close();
				}				
			} catch (IOException e1) {
				e1.printStackTrace();
			}
			try {
				if(httpClient!=null) {
					httpClient.close();
				}
				
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return result;
	}

	public static String get(String url, Map<String, Object> parameterMap)  {
		Assert.hasText(url, "");
		String result = null;
		CloseableHttpResponse httpResponse = null;
		// 设置协议http和https对应的处理socket链接工厂的对象
		CloseableHttpClient httpClient =null;  
		try {
			httpClient=createHttpClient();
			List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
			if (parameterMap != null) {
				for (Entry<String, Object> entry : parameterMap.entrySet()) {
					String name = entry.getKey();
					String value = ConvertUtils.convert(entry.getValue());
					if (StringUtils.isNotEmpty(name)) {
						nameValuePairs.add(new BasicNameValuePair(name, value));
					}
				}
			}
			HttpGet httpGet = new HttpGet(url + (StringUtils.contains(url, "?") ? "&" : "?")
					+ EntityUtils.toString(new UrlEncodedFormEntity(nameValuePairs, "UTF-8")));
			httpResponse = httpClient.execute(httpGet);
			HttpEntity httpEntity = httpResponse.getEntity();
			result = EntityUtils.toString(httpEntity, "UTF-8");
			EntityUtils.consume(httpEntity);
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				if(httpResponse!=null) {
					httpResponse.close();
				}				
			} catch (IOException e1) {
				e1.printStackTrace();
			}
			try {
				if(httpClient!=null) {
					httpClient.close();
				}
				
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return result;
	}

	public static void main(String[] args)  {
		String url="https://www.toutiao.com/";
		
		String result = HttpClientHelper.get(url, null);
		System.out.println(result);
	}
	
	

	private static CloseableHttpClient createHttpClient() throws NoSuchAlgorithmException, KeyManagementException {
		SSLContext sslcontext = createIgnoreVerifySSL();
		// 设置协议http和https对应的处理socket链接工厂的对象
		Registry<ConnectionSocketFactory> socketFactoryRegistry = RegistryBuilder.<ConnectionSocketFactory>create()
				.register("http", PlainConnectionSocketFactory.INSTANCE)
				.register("https", new SSLConnectionSocketFactory(sslcontext)).build();

		PoolingHttpClientConnectionManager connManager = new PoolingHttpClientConnectionManager(socketFactoryRegistry);
		HttpClients.custom().setConnectionManager(connManager);
		CloseableHttpClient httpClient = HttpClients.custom().setConnectionManager(connManager).build();  
		return httpClient;
	}
	/**
	 * 绕过验证
	 * 
	 * @return
	 * @throws NoSuchAlgorithmException
	 * @throws KeyManagementException
	 */
	private static SSLContext createIgnoreVerifySSL() throws KeyManagementException, NoSuchAlgorithmException {
//		 构造SSL环境，指定SSL版本为3.0，SSLv3更加常用。
		SSLContext sc = SSLContext.getInstance("SSLv3");

		// 实现一个X509TrustManager接口，用于绕过验证，不用修改里面的方法
		X509TrustManager trustManager = new X509TrustManager() {
			@Override
			public void checkClientTrusted(java.security.cert.X509Certificate[] paramArrayOfX509Certificate,
					String paramString) {
			}

			@Override
			public void checkServerTrusted(java.security.cert.X509Certificate[] paramArrayOfX509Certificate,
					String paramString) {
			}

			@Override
			public java.security.cert.X509Certificate[] getAcceptedIssuers() {
				return null;
			}
		};

//		sc.init(null, new TrustManager[] { trustManager }, null);
		sc.init(null, null, null);
		return sc;
	}

}