求一个 httpClient 4.5.x 工具类

求一个 httpClient 4.5.x 的工具类，求大佬们赏赐一个！

希望包含上传文件和下载文件的功能，能支持 HTTPS

不做和伸手党，会给分的 😊

下面是按照百度写的代码，感觉有点糟心，提点建议也谢谢了~

package com.fadada.sdk.util.http;

import java.io.IOException;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.Arrays;
import java.util.List;

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

import org.apache.http.Consts;
import org.apache.http.HttpEntity;
import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
import org.apache.http.client.config.AuthSchemes;
import org.apache.http.client.config.CookieSpecs;
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.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.NoopHostnameVerifier;
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.util.EntityUtils;

public class Zhou {

	public static CloseableHttpResponse doGet(String url, String cookie, String refer) throws IOException {
		// http实现get请求:首先设置全局的标准cookie策略
		RequestConfig config = RequestConfig.custom().setCookieSpec(CookieSpecs.STANDARD_STRICT).build();
		// 设置可关闭的httpclient
		CloseableHttpClient httpClient = HttpClients.custom().setDefaultRequestConfig(config).build();
		// 发送get请求
		HttpGet get = new HttpGet(url);
		if (cookie != null) {
			get.setHeader("Cookie", cookie);
		}
		if (refer != null) {
			get.setHeader("Refer", refer);
		}
		CloseableHttpResponse response = httpClient.execute(get);
		return response;
	}

	public static CloseableHttpResponse doPost(String url, List<NameValuePair> values, String cookie, String refer) throws IOException {
		// http实现post请求:首先设置全局的标准cookie策略
		RequestConfig config = RequestConfig.custom().setCookieSpec(CookieSpecs.STANDARD_STRICT).build();
		// 设置可关闭的httpclient
		CloseableHttpClient httpClient = HttpClients.custom().setDefaultRequestConfig(config).build();
		// 对请求参数进行编码后再进行发送
		HttpPost post = new HttpPost(url);
		if (cookie != null) {
			post.setHeader("Cookie", cookie);
		}
		if (refer != null) {
			post.setHeader("Refer", refer);
		}
		UrlEncodedFormEntity entity = new UrlEncodedFormEntity(values, Consts.UTF_8);
		post.setEntity(entity);
		CloseableHttpResponse response = httpClient.execute(post);
		return response;
	}

	private static TrustManager manager = new X509TrustManager() {

		@Override
		public X509Certificate[] getAcceptedIssuers() {
			return null;
		}

		@Override
		public void checkServerTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {

		}

		@Override
		public void checkClientTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {

		}
	};

	private static SSLConnectionSocketFactory socketFactory;// 私密连接工厂

	private static void enableSSL() {
		// https网站一般情况下使用了安全系数较低的SHA-1签名，因此首先我们在调用SSL之前需要重写验证方法，取消检测SSL。
		try {
			SSLContext context = SSLContext.getInstance("TLS");
			context.init(null, new TrustManager[] { manager }, null);
			socketFactory = new SSLConnectionSocketFactory(context, NoopHostnameVerifier.INSTANCE);
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		} catch (KeyManagementException e) {
			e.printStackTrace();
		}
	}

	public static CloseableHttpResponse doHttpsGet(String url, String cookie, String refer) throws IOException {
		enableSSL();
		RequestConfig defaultRequestConfig = RequestConfig.custom().setCookieSpec(CookieSpecs.STANDARD_STRICT).setExpectContinueEnabled(true).setTargetPreferredAuthSchemes(Arrays.asList(AuthSchemes.NTLM, AuthSchemes.DIGEST)).setProxyPreferredAuthSchemes(Arrays.asList(AuthSchemes.NTLM)).build();
		Registry<ConnectionSocketFactory> socketFactoryRegistry = RegistryBuilder.<ConnectionSocketFactory> create().register("http", PlainConnectionSocketFactory.INSTANCE).register("https", socketFactory).build();
		// 创建ConnectionManager，添加Connection配置信息
		PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager(socketFactoryRegistry);
		CloseableHttpClient httpClient = HttpClients.custom().setConnectionManager(connectionManager).setDefaultRequestConfig(defaultRequestConfig).build();
		// 发送get请求
		HttpGet get = new HttpGet(url);
		if (cookie != null) {
			get.setHeader("Cookie", cookie);
		}
		if (refer != null) {
			get.setHeader("Refer", refer);
		}
		CloseableHttpResponse response = httpClient.execute(get);
		return response;
	}

	public static CloseableHttpResponse doHttpsPost(String url, List<NameValuePair> values, String cookie, String refer) throws IOException {
		enableSSL();
		RequestConfig defaultRequestConfig = RequestConfig.custom().setCookieSpec(CookieSpecs.STANDARD_STRICT).setExpectContinueEnabled(true).setTargetPreferredAuthSchemes(Arrays.asList(AuthSchemes.NTLM, AuthSchemes.DIGEST)).setProxyPreferredAuthSchemes(Arrays.asList(AuthSchemes.NTLM)).build();
		Registry<ConnectionSocketFactory> socketFactoryRegistry = RegistryBuilder.<ConnectionSocketFactory> create().register("http", PlainConnectionSocketFactory.INSTANCE).register("https", socketFactory).build();
		// 创建ConnectionManager，添加Connection配置信息
		PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager(socketFactoryRegistry);
		CloseableHttpClient httpClient = HttpClients.custom().setConnectionManager(connectionManager).setDefaultRequestConfig(defaultRequestConfig).build();
		// 对请求参数进行编码后再进行发送
		HttpPost post = new HttpPost(url);
		if (cookie != null) {
			post.setHeader("Cookie", cookie);
		}
		if (refer != null) {
			post.setHeader("Refer", refer);
		}
		UrlEncodedFormEntity entity = new UrlEncodedFormEntity(values, Consts.UTF_8);
		post.setEntity(entity);
		CloseableHttpResponse response = httpClient.execute(post);
		return response;
	}

	public static String doHttpsPost(String url, HttpEntity entity) {
		CloseableHttpClient httpClient = null;
		CloseableHttpResponse response = null;
		try {
			enableSSL();
			RequestConfig defaultRequestConfig = RequestConfig.custom().setCookieSpec(CookieSpecs.STANDARD_STRICT).setExpectContinueEnabled(true).setTargetPreferredAuthSchemes(Arrays.asList(AuthSchemes.NTLM, AuthSchemes.DIGEST)).setProxyPreferredAuthSchemes(Arrays.asList(AuthSchemes.NTLM)).build();
			Registry<ConnectionSocketFactory> socketFactoryRegistry = RegistryBuilder.<ConnectionSocketFactory> create().register("http", PlainConnectionSocketFactory.INSTANCE).register("https", socketFactory).build();
			// 创建ConnectionManager，添加Connection配置信息
			PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager(socketFactoryRegistry);
			httpClient = HttpClients.custom().setConnectionManager(connectionManager).setDefaultRequestConfig(defaultRequestConfig).build();
			// 对请求参数进行编码后再进行发送
			HttpPost post = new HttpPost(url);
			post.setEntity(entity);
			response = httpClient.execute(post);
			if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
				HttpEntity respEntity = response.getEntity();
				if (null == entity) {
					throw new RuntimeException("HttpEntity is null.");
				}
				return EntityUtils.toString(respEntity, Consts.UTF_8);
			} else {
				throw new RuntimeException("connect fail. http_status:" + response.getStatusLine().getStatusCode());
			}
		} catch (Exception e) {
			e.printStackTrace();
			throw new RuntimeException(e);
		}finally{
			try {  
                // 关闭连接,释放资源  
                if (response != null) {  
                    response.close();  
                }  
                if (httpClient != null) {  
                    httpClient.close();  
                }  
            } catch (IOException e) {  
                e.printStackTrace();  
            } 
		}

	}

}