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>

<!--对应的 版本jar-->

<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpasyncclient</artifactId>
<version>4.1.3</version>
</dependency>

<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpmime</artifactId>
<version>4.5.2</version>
</dependency>

<!--我用的是已下的maven依赖包jar-->

<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpcore</artifactId>
<version>4.4.10</version>
</dependency>

<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.6</version>
</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;
    }
}

来源  https://blog.csdn.net/xinxiran/article/details/78893986