java爬虫：在请求body中增加json数据采集

1，http://www.hqepay.com/public/expressquery.html

查询快递不是将键值对post过去，而是将json数据放到body中发送过去。抓包如下：

2，需要导入一些包，代码如下：

import java.io.UnsupportedEncodingException;

import org.apache.http.HttpResponse;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.entity.StringEntity;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.util.EntityUtils;

public class Main {

    public static void main(String[] args) throws Exception {

        // TODO Auto-generated method stub

        DefaultHttpClient client = new DefaultHttpClient();

        String url = "http://www.hqepay.com/common/WebAdapter.aspx";

        HttpPost request = new HttpPost(url);

        request.addHeader("Accept", "application/json, text/javascript, */*; q=0.01");

        request.addHeader("X-Requested-With","XMLHttpRequest");

        request.addHeader("Referer", "http://www.hqepay.com/public/expressquery.html?ECode=ZJS&barNo=8466878151&lab=0");

        request.addHeader("Host","www.hqepay.com");

        String param =  "{\"FunClassName\":\"HqewPay.ExpBLL.ExpOnlineOrderBLL\",\"FunMethodName\":\"IndexTraceInfo\",\"ParamClassName\":\"HqewPay.Express.ExpParam\",\"ParamType\":\"Entity\",\"ParamData\":\"{\\\"ExpNo\\\":\\\"8466878151\\\",\\\"ExpCode\\\":\\\"\\\",\\\"ExpName\\\":\\\"ZJS\\\",\\\"parentCode\\\":\\\"ZJS\\\"}\"}";

        StringEntity se = new StringEntity(param);

        request.setEntity(se);

        HttpResponse httpResponse = client.execute(request);

        String retSrc = EntityUtils.toString(httpResponse.getEntity());

        System.out.println(retSrc);

    }

}