使用Post方法模拟登陆爬取网页的实现方法

使用Post方法模拟登陆爬取网页的实现方法

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 map = postCaphttp://ture(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 postCapture(String requestData) throws Exception{

HashMap 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.toStriPlLGbLFng());

rePlLGbLFturn map;

}

}

版权声明：本文内容由网络用户投稿，版权归原作者所有，本站不拥有其著作权，亦不承担相应法律责任。如果您发现本站中有涉嫌抄袭或描述失实的内容，请联系我们jiasou666@gmail.com 处理，核实后本网站将在24小时内删除侵权内容。