HttpClient post请求 发送Json数据

import org.apache.http.HttpEntity;
import org.apache.http.entity.StringEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;

public void requestToBaiDu() {

//发送请求的URL

String url = "http://www.baidu.com";

//编码格式

String charset = "UTF-8";

//请求内容

String content = "{"date":"2017-11-06 18:27:10.0","sum":"-3400","complainOdrNbr":"null"}";

//使用帮助类HttpClients创建CloseableHttpClient对象.

CloseableHttpClient client = HttpClients.createDefault();

//HTTP请求类型创建HttpPost实例

HttpPost post = new HttpPost(url);

//使用addHeader方法添加请求头部,诸如User-Agent, Accept-Encoding等参数.

post.setHeader("Content-Type", "application/json;charset=UTF-8");

//组织数据

StringEntity se = new StringEntity(content );

//设置编码格式

se.setContentEncoding(charset);

//设置数据类型

se.setContentType("application/json");

//对于POST请求,把请求体填充进HttpPost实体.

post.setEntity(se);

//通过执行HttpPost请求获取CloseableHttpResponse实例 ,从此CloseableHttpResponse实例中获取状态码,错误信息,以及响应页面等等.

CloseableHttpResponse response = client.execute(post);

//通过HttpResponse接口的getEntity方法返回响应信息，并进行相应的处理 

HttpEntity entity = response.getEntity();

String resData = EntityUtils.toString(response.getEntity());

//最后关闭HttpClient资源.

httpClient.close()

}

所需jar包：httpclient-4.5.2.jar，httpcore-4.4.3.jar。可到maven资源库下载