<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.12</version>
</dependency>
<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpmime</artifactId>
    <version>4.5.12</version>
</dependency>

二：HttpClient工具类

package com.mszl.utils;

import lombok.extern.slf4j.Slf4j;
import org.apache.http.HttpEntity;
import org.apache.http.HttpStatus;
import org.apache.http.client.config.RequestConfig;
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.conn.ssl.TrustSelfSignedStrategy;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.entity.mime.content.StringBody;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultHttpRequestRetryHandler;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.ssl.SSLContextBuilder;
import org.apache.http.util.EntityUtils;

import java.io.File;
import java.io.IOException;
import java.security.KeyManagementException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

@Slf4j
public class HttpClientUtils {

	// utf-8字符编码
    public static final String CHARSET_UTF_8 = "utf-8";
    
    // HTTP内容类型。
    public static final String CONTENT_TYPE_TEXT_HTML = "text/xml";

    // HTTP内容类型。相当于form表单的形式，提交数据
    public static final String CONTENT_TYPE_FORM_URL = "application/x-www-form-urlencoded";

    // HTTP内容类型。相当于form表单的形式，提交数据
    public static final String CONTENT_TYPE_JSON_URL = "application/json;charset=utf-8";
    
    // 连接管理器
    private static PoolingHttpClientConnectionManager pool;
    
    // 请求配置
    private static RequestConfig requestConfig;
    
    static {
        try {
            SSLContextBuilder builder = new SSLContextBuilder();
            builder.loadTrustMaterial(null, new TrustSelfSignedStrategy());
            SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(builder.build());
            // 配置同时支持 HTTP 和 HTPPS
            Registry<ConnectionSocketFactory> socketFactoryRegistry = RegistryBuilder.<ConnectionSocketFactory> create().register(
                    "http", PlainConnectionSocketFactory.getSocketFactory()).register("https", sslsf).build();
            pool = new PoolingHttpClientConnectionManager(socketFactoryRegistry);  // 初始化连接管理器
            pool.setMaxTotal(200);  // 将最大连接数增加到200，实际项目最好从配置文件中读取这个值
            pool.setDefaultMaxPerRoute(2);  // 设置最大路由
            int socketTimeout = 10 * 60000;  // 根据默认超时限制初始化requestConfig
            int connectTimeout = 10 * 60000; // 10分钟[单位毫秒]
            int connectionRequestTimeout = 10 * 60000;
            requestConfig = RequestConfig.custom().setConnectionRequestTimeout(connectionRequestTimeout).setSocketTimeout(socketTimeout).setConnectTimeout(connectTimeout).build();
        } catch (NoSuchAlgorithmException e) {
            log.warn(e.getMessage(), e);
        } catch (KeyStoreException e) {
            log.warn(e.getMessage(), e);
        } catch (KeyManagementException e) {
            log.warn(e.getMessage(), e);
        }
    }
    
    public static CloseableHttpClient getHttpClient() {
        CloseableHttpClient httpClient = HttpClients.custom()
                // 设置连接池管理
                .setConnectionManager(pool)
                // 设置请求配置
                .setDefaultRequestConfig(requestConfig)
                // 设置重试次数
                .setRetryHandler(new DefaultHttpRequestRetryHandler(0, false))
                .build();
        return httpClient;
    }
    
    /**
     * 功能：发送Post请求
     * 菜单：
     * 思路：
     * 描述：
     * @Date：2017年8月14日
     * @author：zhangxb25
     */
    private static String sendHttpPost(HttpPost httpPost, Map<String, String> headMap) {
        CloseableHttpClient httpClient = null;
        CloseableHttpResponse response = null;
        // 响应内容
        String responseContent = null;
        try {
            httpClient = getHttpClient();  // 创建默认的httpClient实例.
            httpPost.setConfig(requestConfig);  // 配置请求信息
            response = httpClient.execute(httpPost);  // 执行请求
            HttpEntity entity = response.getEntity();  // 得到响应实例
            
            // 可以获得响应头
            // Header[] headers = response.getHeaders(HttpHeaders.CONTENT_TYPE);
            // for (Header header : headers) {
            // System.out.println(header.getName());
            // }
            
            // 得到响应类型
            // System.out.println(ContentType.getOrDefault(response.getEntity()).getMimeType());
            // 添加请求头
            if (headMap != null && !headMap.isEmpty()) {
            	for (String key : headMap.keySet()) {
					// System.out.println("头部信息key:" + key + "===值: " + headMap.get(key));
					httpPost.addHeader(key, headMap.get(key));
				}
			}
            
            // 判断响应状态
            if (response.getStatusLine().getStatusCode() >= 300) {
                throw new Exception("HTTP Request is not success, Response code is " + response.getStatusLine().getStatusCode());
            }
            if (HttpStatus.SC_OK == response.getStatusLine().getStatusCode()) {
                responseContent = EntityUtils.toString(entity, CHARSET_UTF_8);
                EntityUtils.consume(entity);
            }
        } catch (Exception e) {
			log.warn(e.getMessage(), e);
			String msg=e.getMessage();
			if(msg.equals("Read timed out")){
				return "Read timed out";
			}
		}
        finally {
            try {
                if (response != null) {  // 释放资源
                    response.close();
                }
            } catch (IOException e) {
                log.warn(e.getMessage(), e);
            }
        }
        return responseContent;
    }
    
    /**
     * 功能：发送Get请求
     * 菜单：
     * 思路：
     * 描述：
     * @Date：2017年8月14日
     * @author：zhangxb25
     */
    private static String sendHttpGet(HttpGet httpGet) {
        CloseableHttpClient httpClient = null;
        CloseableHttpResponse response = null;
        String responseContent = null;  // 响应内容
        try {
            httpClient = getHttpClient();  // 创建默认的httpClient实例.
            httpGet.setConfig(requestConfig);  // 配置请求信息
            response = httpClient.execute(httpGet);  // 执行请求
            HttpEntity entity = response.getEntity();  // 得到响应实例
            
            // 可以获得响应头
            // Header[] headers = response.getHeaders(HttpHeaders.CONTENT_TYPE);
            // for (Header header : headers) {
            // System.out.println(header.getName());
            // }
            
            // 得到响应类型
            // System.out.println(ContentType.getOrDefault(response.getEntity()).getMimeType());
            
            // 判断响应状态
            if (response.getStatusLine().getStatusCode() >= 300) {
                throw new Exception("HTTP Request is not success, Response code is " + response.getStatusLine().getStatusCode());
            }
            if (HttpStatus.SC_OK == response.getStatusLine().getStatusCode()) {
                responseContent = EntityUtils.toString(entity, CHARSET_UTF_8);
                EntityUtils.consume(entity);
            }
        } catch (Exception e) {
            log.warn(e.getMessage(), e);
        } finally {
            try {
                if (response != null) {  // 释放资源
                    response.close();
                }
            } catch (IOException e) {
                log.warn(e.getMessage(), e);
            }
        }
        return responseContent;
    }
    
    /**
     * 功能：发送 post请求
     * 菜单：
     * 思路：
     * 描述：
     * @Date：2017年8月14日
     * @author：zhangxb25
     */
    public static String sendHttpPost(String httpUrl, Map<String, String> headMap) {
        HttpPost httpPost = new HttpPost(httpUrl);  // 创建httpPost
        return sendHttpPost(httpPost, headMap);
    }
    
    /**
     * 功能：发送 get请求
     * 菜单：
     * 思路：
     * 描述：
     * @Date：2017年8月14日
     * @author：zhangxb25
     */
    public static String sendHttpGet(String httpUrl) {
        HttpGet httpGet = new HttpGet(httpUrl);  // 创建get请求
        return sendHttpGet(httpGet);
    }
    
    /**
     * 功能：发送 post请求（带文件）
     * 菜单：
     * 思路：
     * 描述：
     * @Date：2017年8月14日
     * @author：zhangxb25
     */
    public static String sendHttpPost(String httpUrl, Map<String, String> headMap, Map<String, String> maps, List<File> fileLists) {
        HttpPost httpPost = new HttpPost(httpUrl);  // 创建httpPost
        MultipartEntityBuilder meBuilder = MultipartEntityBuilder.create();
        if (maps != null) {
            for (String key : maps.keySet()) {
                meBuilder.addPart(key, new StringBody(maps.get(key), ContentType.TEXT_PLAIN));
            }
        }
        if (fileLists != null) {
            for (File file : fileLists) {
                FileBody fileBody = new FileBody(file);
                meBuilder.addPart("files", fileBody);
            }
        }
        HttpEntity reqEntity = meBuilder.build();
        httpPost.setEntity(reqEntity);
        return sendHttpPost(httpPost, headMap);
    }
    
    /**
     * 功能：发送 post请求
     * 菜单：
     * 思路：
     * 描述：参数(格式:key1=value1&key2=value2)
     * @Date：2017年8月14日
     * @author：zhangxb25
     */
    public static String sendHttpPost(String httpUrl, Map<String, String> headMap, String params) {
        HttpPost httpPost = new HttpPost(httpUrl);  // 创建httpPost
        try {
            if (params != null && params.trim().length() > 0) {  // 设置参数
                StringEntity stringEntity = new StringEntity(params, "UTF-8");
                stringEntity.setContentType(CONTENT_TYPE_FORM_URL);
                httpPost.setEntity(stringEntity);
            }
        } catch (Exception e) {
            log.warn(e.getMessage(), e);
        }
        return sendHttpPost(httpPost, headMap);
    }
    
    /**
     * 功能：发送 post请求
     * 菜单：
     * 思路：
     * 描述：
     * @Date：2017年8月14日
     * @author：zhangxb25
     */
    public static String sendHttpPost(String httpUrl, Map<String, String> headMap, Map<String, String> maps) {
        String parem = convertStringParamter(maps);
        return sendHttpPost(httpUrl, headMap, parem);
    }
    
    /**
     * 功能：发送 post请求 发送json数据
     * 菜单：
     * 思路：
     * 描述：参数(格式 json)
     * @Date：2017年8月14日
     * @author：zhangxb25
     */
    public static String sendHttpPostJson(String httpUrl, Map<String, String> headMap, String paramsJson) {
        HttpPost httpPost = new HttpPost(httpUrl);  // 创建httpPost
        try {
            if (paramsJson != null && paramsJson.trim().length() > 0) {  // 设置参数
                StringEntity stringEntity = new StringEntity(paramsJson, "UTF-8");
                stringEntity.setContentType(CONTENT_TYPE_JSON_URL);
                httpPost.setEntity(stringEntity);
            }
        } catch (Exception e) {
            log.warn(e.getMessage(), e);
        }
        return sendHttpPost(httpPost, headMap);
    }
    
    /**
     * 功能：发送 post请求 发送xml数据
     * 菜单：
     * 思路：
     * 描述：参数(格式 Xml)
     * @Date：2017年8月14日
     * @author：zhangxb25
     */
    public static String sendHttpPostXml(String httpUrl, Map<String, String> headMap, String paramsXml) {
        HttpPost httpPost = new HttpPost(httpUrl);  // 创建httpPost
        try {
            if (paramsXml != null && paramsXml.trim().length() > 0) {  // 设置参数
                StringEntity stringEntity = new StringEntity(paramsXml, "UTF-8");
                stringEntity.setContentType(CONTENT_TYPE_TEXT_HTML);
                httpPost.setEntity(stringEntity);
            }
        } catch (Exception e) {
            log.warn(e.getMessage(), e);
        }
        return sendHttpPost(httpPost, headMap);
    }
    
    /**
     * 功能：将map集合的键值对转化成：key1=value1&key2=value2 的形式
     * 菜单：
     * 思路：
     * 描述：parameterMap 需要转化的键值对集合
     * @Date：2017年8月14日
     * @author：zhangxb25
     */
    public static String convertStringParamter(Map parameterMap) {
        StringBuffer parameterBuffer = new StringBuffer();
        if (parameterMap != null) {
            Iterator iterator = parameterMap.keySet().iterator();
            String key = null;
            String value = null;
            while (iterator.hasNext()) {
                key = (String) iterator.next();
                if (parameterMap.get(key) != null) {
                    value = (String) parameterMap.get(key);
                } else {
                    value = "";
                }
                parameterBuffer.append(key).append("=").append(value);
                if (iterator.hasNext()) {
                    parameterBuffer.append("&");
                }
            }
        }
        return parameterBuffer.toString();
    }
    
    public static void main(String[] args) throws Exception {
        // System.out.println(sendHttpGet("http://www.baidu.com"));
    }
	
	
	
}