声明：实习时接到一个送餐机器人项目 涉及到httpclient 

1.创建请求对象:post或者get

 HttpPost httpPost = new HttpPost(url);

2. 创建httpclient对象

CloseableHttpClient httpclient = HttpClientBuilder.create().build();

3. 创建请求头对象

BasicResponseHandler handler = new BasicResponseHandler();

4. 设置请求格式

 StringEntity entity = new StringEntity(jsonData, "utf-8");//解决中文乱码问题entity.setContentEncoding("UTF-8");entity.setContentType("application/json");httpPost.setEntity(entity);

5.执行post请求

 result = httpClient.execute(httpPost, handler);

6.释放连接

 httpClient.close();

Demo

  public static String httpClientPost(String url,String jsonData) {String result = "";//创建post方式请求对象HttpPost httpPost = new HttpPost(url);//创建httpclient对象CloseableHttpClient httpClient = HttpClients.createDefault();try {BasicResponseHandler handler = new BasicResponseHandler();//设置请求格式StringEntity entity = new StringEntity(jsonData, "utf-8");//解决中文乱码问题entity.setContentEncoding("UTF-8");entity.setContentType("application/json");httpPost.setEntity(entity);//执行POST请求result = httpClient.execute(httpPost, handler);return result;} catch (Exception e) {} finally {//释放连接try {httpClient.close();} catch (Exception e) {}}return result;}

具体

	public static Map sendPostJson(String url, String postdataJson) throws JsonProcessingException, UnsupportedEncodingException {HttpPost httpPost = new HttpPost(url);ObjectMapper objectMapper = new ObjectMapper();if(postdataJson != null) {StringEntity entity = new StringEntity(postdataJson, StandardCharsets.UTF_8);httpPost.setEntity(entity);}httpPost.setHeader("Content-type", "application/json"); // 设置内容类型为JSONhttpPost.setHeader("appId", AppUtils.ROBOT_APP_ID);httpPost.setHeader("secret", AppUtils.ROBOT_APP_SECRET);try (CloseableHttpClient client = HttpClients.createDefault()) {try (CloseableHttpResponse response = client.execute(httpPost)) {int status = response.getStatusLine().getStatusCode();System.out.println("Status: " + status);HttpEntity responseEntity = response.getEntity();if (responseEntity != null) {String responseString = EntityUtils.toString(responseEntity);System.out.println("Response: " + responseString);//转换mapMap resultMap = objectMapper.readValue(responseString, Map.class);System.out.println(resultMap);return resultMap;}}} catch (Exception e) {e.printStackTrace();}return null;}