自己改一下url，这里没有main，创建这个类使用post方法而已，需要导入httpclient相关jar包

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;

import org.apache.http.util.TextUtils;

import sun.rmi.runtime.Log;

import com.google.gson.Gson;

import ceb.gz.BaoGuanDan.Baoguangdan;
import ceb.gz.BaoGuanDan.Data;

public class BGDrequest{

  String url = "***";
 
    public static String post(String strURL, String params) { 
        System.out.println(strURL); 
        System.out.println(params);
        String result = "";
        BufferedReader reader = null;

        try { 
            URL url = new URL(strURL);// 创建连接 
            HttpURLConnection connection = (HttpURLConnection) url 
                    .openConnection(); 
            connection.setDoOutput(true); 
            connection.setDoInput(true); 
            connection.setUseCaches(false); 
            connection.setInstanceFollowRedirects(true); 
            connection.setRequestMethod("POST"); // 设置请求方式 
            connection.setRequestProperty("Accept", "application/json"); // 设置接收数据的格式 
            connection.setRequestProperty("Content-Type", "application/json"); // 设置发送数据的格式 
            connection.connect(); 
            if (params != null && !TextUtils.isEmpty(params)) {
                byte[] writebytes = params.getBytes();
                // 设置文件长度
             //   connection.setRequestProperty("Content-Length", String.valueOf(writebytes.length));
                OutputStream outwritestream = connection.getOutputStream();
                outwritestream.write(params.getBytes());
                outwritestream.flush();
                outwritestream.close();
               // Log.d("hlhupload", "doJsonPost: conn"+connection.getResponseCode());
            }
            if (connection.getResponseCode() == 200) {
                reader = new BufferedReader(
                        new InputStreamReader(connection.getInputStream()));
                result = reader.readLine();
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return result;

    } 
 
}