HttpClient请求工具类

 ?1 package com.yangche.utils; ?2 ??3 import org.apache.http.NameValuePair; ?4 import org.apache.http.client.ClientProtocolException; ?5 import org.apache.http.client.entity.UrlEncodedFormEntity; ?6 import org.apache.http.client.methods.*; ?7 import org.apache.http.client.utils.URIBuilder; ?8 import org.apache.http.entity.ContentType; ?9 import org.apache.http.entity.StringEntity; 10 import org.apache.http.impl.client.CloseableHttpClient; 11 import org.apache.http.impl.client.HttpClients; 12 import org.apache.http.message.BasicNameValuePair; 13 import org.apache.http.util.EntityUtils; 14 import org.springframework.util.StringUtils; 15 ?16 import java.io.IOException; 17 import java.io.UnsupportedEncodingException; 18 import java.net.URI; 19 import java.net.URISyntaxException; 20 import java.util.ArrayList; 21 import java.util.List; 22 import java.util.Map; 23 ?24 public class HttpClientUtil { 25 ????public static String doGet(String url, Map<String,Object> param){ 26 ????????//创建httpclient对象 27 ????????CloseableHttpClient httpClient = HttpClients.createDefault(); 28 ????????String resultString=""; 29 ????????CloseableHttpResponse response=null; 30 ????????try { 31 ????????????URIBuilder builder=new URIBuilder(url); 32 ????????????if(param!=null){ 33 ????????????????for (String key:param.keySet()){ 34 ????????????????????if(param.get(key) instanceof List){ 35 ????????????????????????List list=(List)param.get(key); 36 ????????????????????????for (Object liString:list){ 37 ????????????????????????????builder.addParameter(key,String.valueOf(liString)); 38 ????????????????????????} 39 ????????????????????}else { 40 ????????????????????????builder.addParameter(key,String.valueOf(param.get(key))); 41 ????????????????????} 42 ????????????????} 43 ????????????} 44 ????????????URI uri=builder.build(); 45 ????????????//创建httpGet请求 46 ????????????HttpGet httpGet=new HttpGet(uri); 47 ????????????//执行请求 48 ????????????response=httpClient.execute(httpGet); 49 ????????????resultString= EntityUtils.toString(response.getEntity(),"UTF-8"); 50 ????????} catch (URISyntaxException e) { 51 ????????????e.printStackTrace(); 52 ????????} catch (ClientProtocolException e) { 53 ????????????e.printStackTrace(); 54 ????????} catch (IOException e) { 55 ????????????e.printStackTrace(); 56 ????????}finally { 57 ????????????try { 58 ????????????????if(response!=null){ 59 ????????????????????response.close(); 60 ????????????????} 61 ????????????????httpClient.close(); 62 ????????????} catch (IOException e) { 63 ????????????????e.printStackTrace(); 64 ????????????} 65 ????????} 66 ????????return resultString; 67 ????} 68 ????public static String doGet(String url){ 69 ????????return doGet(url,null); 70 ????} 71 ????public static String doPost(String url,Map<String,String> param){ 72 ????????//创建httpclient对象 73 ????????CloseableHttpClient httpClient = HttpClients.createDefault(); 74 ????????CloseableHttpResponse response=null; 75 ????????String resultString=""; 76 ????????//创建httpPost请求 77 ????????HttpPost httpPost = new HttpPost(url); 78 ????????//创建参数列表 79 ????????if(param!=null){ 80 ????????????List<NameValuePair> paramList=new ArrayList<>(); 81 ????????????for (String key:param.keySet()){ 82 ????????????????paramList.add(new BasicNameValuePair(key,param.get(key))); 83 ????????????} 84 ????????????try { 85 ????????????????//模拟表单 86 ????????????????UrlEncodedFormEntity entity=new UrlEncodedFormEntity(paramList); 87 ????????????????httpPost.setEntity(entity); 88 ????????????????//执行http请求 89 ????????????????response=httpClient.execute(httpPost); 90 ????????????????resultString=EntityUtils.toString(response.getEntity(),"UTF-8"); 91 ????????????} catch (UnsupportedEncodingException e) { 92 ????????????????e.printStackTrace(); 93 ????????????} catch (ClientProtocolException e) { 94 ????????????????e.printStackTrace(); 95 ????????????} catch (IOException e) { 96 ????????????????e.printStackTrace(); 97 ????????????}finally { 98 ????????????????try { 99 ????????????????????response.close();100 ????????????????} catch (IOException e) {101 ????????????????????e.printStackTrace();102 ????????????????}103 ????????????}104 ????????}105 ????????return resultString;106 ????}107 ????public static String doPost(String url){108 ????????return doPost(url,null);109 ????}110 111 ????/**112 ?????* restful请求113 ?????* @param url114 ?????* @param requestType 请求类型：post、delete、patch115 ?????* @param json116 ?????* @return117 ?????*/118 ????public static String doRequest(String url,String requestType,String json){119 ????????//创建HttpClient对象120 ????????CloseableHttpClient httpClient=HttpClients.createDefault();121 ????????CloseableHttpResponse response=null;122 ????????String resultString="";123 ????????try {124 ????????????//创建不同类型的请求125 ????????????HttpPost httpPost=new HttpPost(url);126 ????????????HttpDeleteWithBody httpDelete =new HttpDeleteWithBody(url);127 ????????????HttpPatch httpPatch=new HttpPatch(url);128 ????????????//创建请求内容129 ????????????StringEntity entity=new StringEntity(json, ContentType.APPLICATION_JSON);130 ????????????//执行http请求131 ????????????if(!StringUtils.isEmpty(requestType)&&requestType.equalsIgnoreCase("post")){132 ????????????????httpPost.setEntity(entity);133 ????????????????response=httpClient.execute(httpPost);134 ????????????}else if(!StringUtils.isEmpty(requestType)&&requestType.equalsIgnoreCase("delete")){135 ????????????????httpDelete.setEntity(entity);136 ????????????????response=httpClient.execute(httpDelete);137 ????????????}else if(!StringUtils.isEmpty(requestType)&&requestType.equalsIgnoreCase("patch")){138 ????????????????httpPatch.setEntity(entity);139 ????????????????response=httpClient.execute(httpPatch);140 ????????????}141 ????????????resultString=EntityUtils.toString(response.getEntity(),"UTF-8");142 ????????} catch (IOException e) {143 ????????????e.printStackTrace();144 ????????} finally {145 ????????????try {146 ????????????????response.close();147 ????????????} catch (IOException e) {148 ????????????????e.printStackTrace();149 ????????????}150 ????????}151 ????}152 153 ????private static class HttpDeleteWithBody extends HttpEntityEnclosingRequestBase {154 ????????public static final String METHOD_NAME="DELETE";155 ????????@Override156 ????????public String getMethod() {157 ????????????return METHOD_NAME;158 ????????}159 ????????public HttpDeleteWithBody (final String uri){160 ????????????super();161 ????????????setURI(URI.create(uri));162 ????????}163 ????????public HttpDeleteWithBody (final URI uri){164 ????????????super();165 ????????????setURI(uri);166 ????????}167 ????????public HttpDeleteWithBody(){168 ????????????super();169 ????????}170 ????}171 }

 1 <!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpcore --> 2 <dependency> 3 ????<groupId>org.apache.httpcomponents</groupId> 4 ????<artifactId>httpcore</artifactId> 5 ????<version>4.4.10</version> 6 </dependency> 7 ?8 <!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient --> 9 <dependency>10 ????<groupId>org.apache.httpcomponents</groupId>11 ????<artifactId>httpclient</artifactId>12 ????<version>4.5.6</version>13 </dependency>