JavaUtils-HttpClientUtil.template

package com.sd.packagename.common.util;

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

import org.apache.http.NameValuePair;
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.client.utils.URIBuilder;
import org.apache.http.entity.ContentType;
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;

/**
 * @Created with Atom
 * @author @author@
 * @time @now@
 * @description
 * HttpClientUtil
 *
 **/

public class HttpClientUtil {
  public static String doGet(String url, Map < String, String > param) {
    // 创建Httpclient对象
    CloseableHttpClient httpclient = HttpClients.createDefault();

    String resultString = "";
    CloseableHttpResponse response = null;

    try {
      // 创建uri
      URIBuilder builder = new URIBuilder(url);
      if (param != null) {
        for (String key: param.keySet()) {
          builder.addParameter(key, param.get(key));
        }
      }
      URI uri = builder.build();

      // 创建http GET请求
      HttpGet httpGet = new HttpGet(uri);

      // 执行请求
      response = httpclient.execute(httpGet);
      // 判断返回状态是否为200
      if (response.getStatusLine().getStatusCode() == 200) {
        resultString = EntityUtils.toString(response.getEntity(), "UTF-8");
      }
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      try {
        if (response != null) {
          response.close();
        }
        httpclient.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
    return (resultString);
  }

  public static String doGet(String url) {
    return (doGet(url, null));
  }

  public static String doPost(String url, Map < String, String > param) {
    // 创建Httpclient对象
    CloseableHttpClient httpClient = HttpClients.createDefault();
    CloseableHttpResponse response = null;
    String resultString = "";

    try {
      // 创建Http Post请求
      HttpPost httpPost = new HttpPost(url);
      // 创建参数列表
      if (param != null) {
        List < NameValuePair > paramList = new ArrayList < > ();
        for (String key: param.keySet()) {
          paramList.add(new BasicNameValuePair(key, param.get(key)));
        }
        // 模拟表单
        UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList);
        httpPost.setEntity(entity);
      }
      // 执行http请求
      response = httpClient.execute(httpPost);
      resultString = EntityUtils.toString(response.getEntity(), "utf-8");
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      try {
        response.close();
      } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
    }

    return (resultString);
  }

  public static String doPost(String url) {
    return (doPost(url, null));
  }

  public static String doPostJson(String url, String json) {
    // 创建Httpclient对象
    CloseableHttpClient httpClient = HttpClients.createDefault();
    CloseableHttpResponse response = null;
    String resultString = "";

    try {
      // 创建Http Post请求
      HttpPost httpPost = new HttpPost(url);
      // 创建请求内容
      StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON);
      httpPost.setEntity(entity);
      // 执行http请求
      response = httpClient.execute(httpPost);
      resultString = EntityUtils.toString(response.getEntity(), "utf-8");
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      try {
        response.close();
      } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
    }

    return (resultString);
  }
}