在开发项目的过程中经常需要和第三方进行接口对接，这个时候需要调用第三方的接口，为了提高开发效率，我们可以专门封装一个工具类用来调用第三方接口。
HttpUtil
package com.hnxf.video.hunanxfv.util; 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.HttpPost; 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 org.springframework.http.HttpRequest; import java.io.IOException; import java.io.PrintWriter; import java.util.ArrayList; import java.util.List; import java.util.Map; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class HttpUtil { public static List<NameValuePair> convertMapToPair(Map<String, String> params) { List<NameValuePair> pairs = new ArrayList<NameValuePair>(); for (Map.Entry<String, String> entry : params.entrySet()) { pairs.add(new BasicNameValuePair(entry.getKey(), entry.getValue())); } return pairs; } public static String post(String url, Map<String, String> param) { String result = null; CloseableHttpResponse httpResponse = null; CloseableHttpClient httpClient = HttpClients.createDefault(); HttpPost httpPost = new HttpPost(url); try { httpPost.setEntity(new UrlEncodedFormEntity(convertMapToPair(param), "utf-8")); httpResponse = httpClient.execute(httpPost); result = EntityUtils.toString(httpResponse.getEntity()); } catch (Exception e) { e.printStackTrace(); } finally { try { if (httpResponse != null) { httpResponse.close(); } } catch (IOException e) { e.printStackTrace(); } try { if (httpClient != null) { httpClient.close(); } } catch (IOException e) { e.printStackTrace(); } } return result; } public static String get(String url, Map<String, Object> param) { String result = null; CloseableHttpResponse httpResponse = null; CloseableHttpClient httpClient = HttpClients.createDefault(); HttpPost httpPost = new HttpPost(url); try { httpPost.setEntity(new UrlEncodedFormEntity(convertMapToPairs(param), "utf-8")); httpResponse = httpClient.execute(httpPost); result = EntityUtils.toString(httpResponse.getEntity()); } catch (Exception e) { e.printStackTrace(); } finally { try { if (httpResponse != null) { httpResponse.close(); } } catch (IOException e) { e.printStackTrace(); } try { if (httpClient != null) { httpClient.close(); } } catch (IOException e) { e.printStackTrace(); } } return result; } public static List<NameValuePair> convertMapToPairs(Map<String, Object> params) { List<NameValuePair> pairs = new ArrayList<NameValuePair>(); for (Map.Entry<String, Object> entry : params.entrySet()) { pairs.add(new BasicNameValuePair(entry.getKey(), (String) entry.getValue())); } return pairs; } }