HttpClient如何使用post的方式传送raw的数据呢?

实现思路:
    1.定义传送数据类型为 application/json
	2.将参数组合为一个json数据串
	3.调用httpPost即可

// 创建http对象
HttpPost httpPost = new HttpPost(url);
// 设置请求头
packageHeader(headers, httpPost);
// 给httpPost设置JSON格式的参数
StringEntity requestEntity = new StringEntity(json, "utf-8");
requestEntity.setContentEncoding("UTF-8");
httpPost.setHeader("Content-type", "application/json");
httpPost.setEntity(requestEntity);

// 执行请求并获得响应结果
return getHttpClientResult(httpPost);