一、Maven引用httpclient

<dependency><groupId>org.apache.httpcomponents</groupId><artifactId>httpclient</artifactId><version>4.5.3</version>
</dependency>

二、直接上代码

 private  void  PostData(){CloseableHttpClient httpClient = HttpClients.createDefault();HttpPost httpPost = new HttpPost("https://www.baidu.com/");httpPost.setHeader("Content-type", "application/json;charset=utf-8");httpPost.setHeader("Connection", "Close");httpPost.setHeader("Authorization","Basic xxxxxxxx=");String jsonStr="{}";StringEntity entity = new StringEntity(jsonStr, Charset.forName("UTF-8"));entity.setContentEncoding("UTF-8");entity.setContentType("application/json");httpPost.setEntity(entity);CloseableHttpResponse httpResponse;String result = null;try {httpResponse = httpClient.execute(httpPost);result = EntityUtils.toString(httpResponse.getEntity(), "UTF-8");} catch (IOException e) {e.printStackTrace();}}

运行效果：