HttpClient接口调用工具类(附带demo)

package com.example.HttpClient; import org.apache.http.NameValuePair; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.*; import org.apache.http.client.utils.URIBuilder; 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 java.io.IOException; import java.util.ArrayList; import java.util.List; import java.util.Map; //需要引入的jar包 //compile('org.apache.httpcomponents:httpclient:4.5.6') //compile('org.apache.httpcomponents:httpcore:4.4.3') /** * @program: webservice_demo * @description: HttpClient工具类 * @author: miaoqixin * @create: 2018-11-28 16:39 **/ public class HttpClientUtil { private CloseableHttpClient httpClient; public HttpClientUtil() { // 1 创建HttpClinet，相当于打开浏览器 httpClient = HttpClients.createDefault(); } /* * * get请求 * @author miaoqixin * @date 2018/11/28 16:51 * @param [url, map] * @return HttpResult */ public HttpResult doGet(String url, Map<String, Object> map) throws Exception { // 声明URIBuilder URIBuilder uriBuilder = new URIBuilder(url); // 判断参数map是否为非空 if (map != null) { // 遍历参数 for (Map.Entry<String, Object> entry : map.entrySet()) { // 设置参数 uriBuilder.setParameter(entry.getKey(), entry.getValue().toString()); } } // 2 创建httpGet对象，相当于设置url请求地址 HttpGet httpGet = new HttpGet(uriBuilder.build()); // 3 使用HttpClient执行httpGet，相当于按回车，发起请求 CloseableHttpResponse response = null; try { response = httpClient.execute(httpGet); } catch (IOException e) { HttpResult httpResult = new HttpResult(); httpResult.setCode(404); httpResult.setBody("请求失败"); return httpResult; } // 4 解析结果，封装返回对象httpResult，相当于显示相应的结果 // 状态码 // response.getStatusLine().getStatusCode(); // 响应体，字符串，如果response.getEntity()为空，下面这个代码会报错,所以解析之前要做非空的判断 // EntityUtils.toString(response.getEntity(), "UTF-8"); HttpResult httpResult = new HttpResult(); // 解析数据封装HttpResult if (response.getEntity() != null) { //httpResult = new HttpResult(response.getStatusLine().getStatusCode(),EntityUtils.toString(response.getEntity(),"UTF-8")); httpResult.setCode(response.getStatusLine().getStatusCode()); httpResult.setBody(EntityUtils.toString(response.getEntity(),"UTF-8")); } else { //httpResult = new HttpResult(response.getStatusLine().getStatusCode(), ""); httpResult.setCode(response.getStatusLine().getStatusCode()); //httpResult.setBody(""); } // 返回 return httpResult; } /* * * post请求 * @author miaoqixin * @date 2018/11/28 18:13 * @param [url, map] * @return com.example.HttpClient.HttpResult */ public HttpResult doPost(String url, Map<String, Object> map) throws Exception { // 声明httpPost请求 HttpPost httpPost = new HttpPost(url); // 判断map不为空 if (map != null) { // 声明存放参数的List集合 List<NameValuePair> params = new ArrayList<NameValuePair>(); // 遍历map，设置参数到list中 for (Map.Entry<String, Object> entry : map.entrySet()) { params.add(new BasicNameValuePair(entry.getKey(), entry.getValue().toString())); } // 创建form表单对象 UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(params, "UTF-8"); // 把表单对象设置到httpPost中 httpPost.setEntity(formEntity); } // 使用HttpClient发起请求，返回response CloseableHttpResponse response = null; try { response = httpClient.execute(httpPost); } catch (IOException e) { HttpResult httpResult = new HttpResult(); httpResult.setCode(404); httpResult.setBody("请求失败"); return httpResult; } // 解析response封装返回对象httpResult HttpResult httpResult = new HttpResult(); // 解析数据封装HttpResult if (response.getEntity() != null) { //httpResult = new HttpResult(response.getStatusLine().getStatusCode(),EntityUtils.toString(response.getEntity(),"UTF-8")); httpResult.setCode(response.getStatusLine().getStatusCode()); httpResult.setBody(EntityUtils.toString(response.getEntity(),"UTF-8")); } else { //httpResult = new HttpResult(response.getStatusLine().getStatusCode(), ""); httpResult.setCode(response.getStatusLine().getStatusCode()); //httpResult.setBody(""); } // 返回结果 return httpResult; } /* * * Put请求 * @author miaoqixin * @date 2018/11/28 18:14 * @param [url, map] * @return com.example.HttpClient.HttpResult */ public HttpResult doPut(String url, Map<String, Object> map) throws Exception { // 声明httpPost请求 HttpPut httpPut = new HttpPut(url); // 判断map不为空 if (map != null) { // 声明存放参数的List集合 List<NameValuePair> params = new ArrayList<NameValuePair>(); // 遍历map，设置参数到list中 for (Map.Entry<String, Object> entry : map.entrySet()) { params.add(new BasicNameValuePair(entry.getKey(), entry.getValue().toString())); } // 创建form表单对象 UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(params, "UTF-8"); // 把表单对象设置到httpPost中 httpPut.setEntity(formEntity); } // 使用HttpClient发起请求，返回response CloseableHttpResponse response = null; try { response = httpClient.execute(httpPut); } catch (IOException e) { HttpResult httpResult = new HttpResult(); httpResult.setCode(404); httpResult.setBody("请求失败"); return httpResult; } // 解析response封装返回对象httpResult HttpResult httpResult = new HttpResult(); // 解析数据封装HttpResult if (response.getEntity() != null) { //httpResult = new HttpResult(response.getStatusLine().getStatusCode(),EntityUtils.toString(response.getEntity(),"UTF-8")); httpResult.setCode(response.getStatusLine().getStatusCode()); httpResult.setBody(EntityUtils.toString(response.getEntity(),"UTF-8")); } else { //httpResult = new HttpResult(response.getStatusLine().getStatusCode(), ""); httpResult.setCode(response.getStatusLine().getStatusCode()); //httpResult.setBody(""); } // 返回结果 return httpResult; } /* * * Delete请求 * @author miaoqixin * @date 2018/11/28 18:20 * @param [url, map] * @return com.example.HttpClient.HttpResult */ public HttpResult doDelete(String url, Map<String, Object> map) throws Exception { // 声明URIBuilder URIBuilder uriBuilder