最近弄爬虫，遇到的一个问题就是如何使用post方法模拟登陆爬取网页。下面是极简版的代码：
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; ???}}原文地址：
http://wangxin123.com/2016/12/19/%E4%BD%BF%E7%94%A8Post%E6%96%B9%E6%B3%95%E6%A8%A1%E6%8B%9F%E7%99%BB%E9%99%86%E7%88%AC%E5%8F%96%E7%BD%91%E9%A1%B5/
使用Post方法模拟登陆爬取网页(转)
原文地址：http://www.cnblogs.com/panxuejun/p/7476222.html