HttpClient封装工具类

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;

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;

       }

}