HttpClient实现调用外部项目接口工具类的示例

实例如下：

import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.http.NameValuePair;
import org.apache.http.HttpEntity;
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.DefaultHostnameVerifier;
import org.apache.http.conn.util.PublicSuffixMatcher;
import org.apache.http.conn.util.PublicSuffixMatcherLoader;
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;

public class HttpUtils {
 private static RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(15000).setConnectTimeout(15000)
  .setConnectionRequestTimeout(15000).build();

 public static String sendHttpGet(HttpGet httpGet) {
 CloseableHttpClient httpClient = null;
 CloseableHttpResponse response = null;
 HttpEntity entity = null;
 String responseContent = null;
 try {
  // 创建默认的httpClient实例.
  httpClient = HttpClients.createDefault();
  httpGet.setConfig(requestConfig); 

  // 执行请求
  response = httpClient.execute(httpGet);
  entity = response.getEntity();
  responseContent = EntityUtils.toString(entity, "UTF-8");
 } catch (Exception e) {
  e.printStackTrace();
 } 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();
  }
 }
 return responseContent;
 }
 /**
   * 发送 post请求
   * @param httpUrl 地址
   * @param maps 参数
   */
  public static String sendHttpPost(String httpUrl, Map<String, String> maps) {
    HttpPost httpPost = new HttpPost(httpUrl);// 创建httpPost
    // 创建参数队列
    List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
    for (String key : maps.keySet()) {
      nameValuePairs.add(new BasicNameValuePair(key, maps.get(key)));
    }
    try {
      httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs, "UTF-8"));
    } catch (Exception e) {
      e.printStackTrace();
    }
    return sendHttpPost(httpPost);
  } 

 public static String sendHttpPost(HttpPost httpPost) {
 CloseableHttpClient httpClient = null;
 CloseableHttpResponse response = null;
 HttpEntity entity = null;
 String responseContent = null;
 try {
  // 创建默认的httpClient实例.
  httpClient = HttpClients.createDefault();
  httpPost.setConfig(requestConfig);
  // 执行请求
  response = httpClient.execute(httpPost);
  entity = response.getEntity();
  responseContent = EntityUtils.toString(entity, "UTF-8");
 } catch (Exception e) {
  e.printStackTrace();
 } 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();
  }
 }
 return responseContent;
 }

 /**
   * 发送Get请求Https
   * @param httpPost
   * @return
   */
  public static String sendHttpsGet(HttpGet httpGet) {
    CloseableHttpClient httpClient = null;
    CloseableHttpResponse response = null;
    HttpEntity entity = null;
    String responseContent = null;
    try {
      // 创建默认的httpClient实例.
      PublicSuffixMatcher publicSuffixMatcher = PublicSuffixMatcherLoader.load(new URL(httpGet.getURI().toString()));
      DefaultHostnameVerifier hostnameVerifier = new DefaultHostnameVerifier(publicSuffixMatcher);
      httpClient = HttpClients.custom().setSSLHostnameVerifier(hostnameVerifier).build();
      httpGet.setConfig(requestConfig);
      // 执行请求
      response = httpClient.execute(httpGet);
      entity = response.getEntity();
      responseContent = EntityUtils.toString(entity, "UTF-8");
    } catch (Exception e) {
      e.printStackTrace();
    } 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();
      }
    }
    return responseContent;
  }
}

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