Java发送HTTP或者HTTPS请求

import org.apache.http.Consts;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.*;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.conn.ssl.SSLContextBuilder;
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.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import javax.net.ssl.SSLContext;
import java.io.IOException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.text.ParseException;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
/**
 * http请求客户端
 * @author Administrator
 */
public class HttpClient {
  private String url;
  private Map<String, String> param;
  private int statusCode;
  private String content;
  private String xmlParam;
  private boolean isHttps;
  public boolean isHttps() {
    return isHttps;
  }
  public void setHttps(boolean isHttps) {
    this.isHttps = isHttps;
  }
  public String getXmlParam() {
    return xmlParam;
  }
  public void setXmlParam(String xmlParam) {
    this.xmlParam = xmlParam;
  }
  public HttpClient(String url, Map<String, String> param) {
    this.url = url;
    this.param = param;
  }
  public HttpClient(String url) {
    this.url = url;
  }
  public void setParameter(Map<String, String> map) {
    param = map;
  }
  public void addParameter(String key, String value) {
    if (param == null)
      param = new HashMap<String, String>();
    param.put(key, value);
  }
  public void post() throws ClientProtocolException, IOException {
    HttpPost http = new HttpPost(url);
    setEntity(http);
    execute(http);
  }
  public void put() throws ClientProtocolException, IOException {
    HttpPut http = new HttpPut(url);
    setEntity(http);
    execute(http);
  }
  public void get() throws ClientProtocolException, IOException {
    if (param != null) {
      StringBuilder url = new StringBuilder(this.url);
      boolean isFirst = true;
      for (String key : param.keySet()) {
        if (isFirst)
          url.append("?");
        else
          url.append("&");
        url.append(key).append("=").append(param.get(key));
      }
      this.url = url.toString();
    }
    HttpGet http = new HttpGet(url);
    execute(http);
  }
  /**
   * set http post,put param
   */
  private void setEntity(HttpEntityEnclosingRequestBase http) {
    if (param != null) {
      List<NameValuePair> nvps = new LinkedList<NameValuePair>();
      for (String key : param.keySet())
        nvps.add(new BasicNameValuePair(key, param.get(key))); // 参数
      http.setEntity(new UrlEncodedFormEntity(nvps, Consts.UTF_8)); // 设置参数
    }
    if (xmlParam != null) {
      http.setEntity(new StringEntity(xmlParam, Consts.UTF_8));
    }
  }
  private void execute(HttpUriRequest http) throws ClientProtocolException,
      IOException {
    CloseableHttpClient httpClient = null;
    try {
      if (isHttps) {
        SSLContext sslContext = new SSLContextBuilder()
            .loadTrustMaterial(null, new TrustStrategy() {
              // 信任所有
              public boolean isTrusted(X509Certificate[] chain,
                  String authType)
                  throws CertificateException {
                return true;
              }
            }).build();
        SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(
            sslContext);
        httpClient = HttpClients.custom().setSSLSocketFactory(sslsf)
            .build();
      } else {
        httpClient = HttpClients.createDefault();
      }
      CloseableHttpResponse response = httpClient.execute(http);
      try {
        if (response != null) {
          if (response.getStatusLine() != null)
            statusCode = response.getStatusLine().getStatusCode();
          HttpEntity entity = response.getEntity();
          // 响应内容
          content = EntityUtils.toString(entity, Consts.UTF_8);
        }
      } finally {
        response.close();
      }
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      httpClient.close();
    }
  }
  public int getStatusCode() {
    return statusCode;
  }
  public String getContent() throws ParseException, IOException {
    return content;
  }
}

<!--httpclient依赖-->
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
        </dependency>