HttpClientUtil工具类的使用，亲测可用

前端时间领导要求弄个HttpClient 推送订单的例子
截图科普来自于百科

怎么做？

第一步 pom依赖

<dependency><groupId>org.apache.httpcomponents</groupId><artifactId>httpcore</artifactId><version>4.4.4</version></dependency><dependency><groupId>org.apache.httpcomponents</groupId><artifactId>httpcore-nio</artifactId><version>4.4.6</version></dependency><dependency><groupId>org.apache.httpcomponents</groupId><artifactId>httpclient</artifactId><version>4.5.5</version></dependency>

第二步 编写HttpClientUtil 工具类

import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.util.ArrayList;import java.util.List;import java.util.Map;import java.util.Set;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.NameValuePair;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.HttpClient;import org.apache.http.client.config.RequestConfig;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.HttpPost;import org.apache.http.entity.StringEntity;import org.apache.http.impl.client.HttpClients;import org.apache.http.message.BasicNameValuePair;public class HttpClientUtil {//传输参数类型mappublic static String post(String url, Map<String, String> paramMap) throws ClientProtocolException, IOException {HttpClient httpClient = HttpClients.createDefault();HttpPost httpPost = new HttpPost(url);//设置请求和传输超时时间RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(60000).setConnectTimeout(60000).build();httpPost.setConfig(requestConfig);httpPost.setHeader(\"Content-Type\",\"application/json;charset=UTF-8\");List<NameValuePair> formparams = setHttpParams(paramMap);UrlEncodedFormEntity param = new UrlEncodedFormEntity(formparams, \"UTF-8\");httpPost.setEntity(param);HttpResponse response = httpClient.execute(httpPost);String httpEntityContent = getHttpEntityContent(response);httpPost.abort();return httpEntityContent;}//传输参数类型json字符串public static String post(String url, String data) throws ClientProtocolException, IOException {HttpClient httpClient = HttpClients.createDefault();HttpPost httpPost = new HttpPost(url);//设置请求和传输超时时间RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(60000).setConnectTimeout(60000).build();httpPost.setConfig(requestConfig);httpPost.setHeader(\"Content-Type\", \"application/json;charset=UTF-8\");httpPost.setEntity(new StringEntity(data, \"UTF-8\"));HttpResponse response = httpClient.execute(httpPost);String httpEntityContent = getHttpEntityContent(response);httpPost.abort();return httpEntityContent;}private static String getHttpEntityContent(HttpResponse response) throws IOException{HttpEntity  entity = response.getEntity();if(entity != null){InputStream is = entity.getContent();BufferedReader br = new BufferedReader(new InputStreamReader(is,\"UTF-8\"));String line = br.readLine();StringBuilder  sb = new StringBuilder();while(line !=null){sb.append(line+\"\\n\");line = br.readLine();}return sb.toString();}return \"\";}private static List<NameValuePair> setHttpParams(Map<String,String> paramMap){List<NameValuePair> formparams =  new ArrayList<NameValuePair>();Set<Map.Entry<String,String>> set = paramMap.entrySet();for(Map.Entry<String, String> entry:set){formparams.add(new BasicNameValuePair(entry.getKey(),entry.getValue()));}return formparams;}}

第三步 写个测试类

private static String url = \"http://182.180.xxx.xxx/xxxWeb/xxx/xxxQuery\";public static void main(String[] args) {Map<String,String> paramMap = new HashMap<String,String>();paramMap.put(\"date\", \"\");paramMap.put(\"time\", \"\");paramMap.put(\"id\", \"\");String param =  JSON.toJSONString(paramMap);try {//推送订单关键代码HttpClientUtil.post(url, param);} catch (ClientProtocolException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}

HttpClientUtil也是参考网上的，
pom依赖是我自己整的，网上说的是添加一头一尾 中间那个不要，我只要把中间删除，代码就报错，所以就留着了。