import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import java.io.PrintWriter;

import java.net.HttpURLConnection;

import java.net.URL;

import java.util.HashMap;

public class test {

    //post请求地址

    private static final String POST_URL = "";

    //模拟谷歌浏览器请求

    private static final String USER_AGENT = "";

    //用账号登录某网站后 请求POST_URL链接获取cookie

    private static final String COOKIE = "";

    //用账号登录某网站后 请求POST_URL链接获取数据包

    private static final String REQUEST_DATA =  "";

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

        HashMap<String, String> map = postCapture(REQUEST_DATA);

        String responseCode = map.get("responseCode");

        String value = map.get("value");

        while(!responseCode.equals("200")){

            map =  postCapture(REQUEST_DATA);

            responseCode = map.get("responseCode");

            value = map.get("value");

        }

        //打印爬取结果

        System.out.println(value);

    }

    private static HashMap<String, String> postCapture(String requestData) throws Exception{

        HashMap<String, String> map = new HashMap<>();

        URL url = new URL(POST_URL);

        HttpURLConnection httpConn = (HttpURLConnection) url.openConnection();

        httpConn.setDoInput(true); // 设置输入流采用字节流

        httpConn.setDoOutput(true); // 设置输出流采用字节流

        httpConn.setUseCaches(false); //设置缓存

        httpConn.setRequestMethod("POST");//POST请求

        httpConn.setRequestProperty("User-Agent", USER_AGENT);

        httpConn.setRequestProperty("Cookie", COOKIE);

        PrintWriter out = new PrintWriter(new OutputStreamWriter(httpConn.getOutputStream(), "UTF-8"));

        out.println(requestData);

        out.close();

        int responseCode = httpConn.getResponseCode();

        StringBuffer buffer = new StringBuffer();

        if (responseCode == 200) {

            BufferedReader reader = new BufferedReader(new InputStreamReader(httpConn.getInputStream(), "UTF-8"));

            String line = null;

            while ((line = reader.readLine()) != null) {

                buffer.append(line);

            }

            reader.close();

            httpConn.disconnect();

        }

        map.put("responseCode", new Integer(responseCode).toString());

        map.put("value", buffer.toString());

        return map;

    }

}