使用Post方法模擬登陸爬取網頁的實現方法

更新時間：2017年03月27日 09:39:20 投稿：jingxian

下面小編就為大家?guī)硪黄褂肞ost方法模擬登陸爬取網頁的實現方法。小編覺得挺不錯的，現在就分享給大家，也給大家做個參考。一起跟隨小編過來看看吧

最近弄爬蟲，遇到的一個問題就是如何使用post方法模擬登陸爬取網頁。

下面是極簡版的代碼：

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請求地址
 private static final String POST_URL = "";
 
 //模擬谷歌瀏覽器請求
 private static final String USER_AGENT = "";
 
 //用賬號登錄某網站后 請求POST_URL鏈接獲取cookie
 private static final String COOKIE = "";
 
 //用賬號登錄某網站后 請求POST_URL鏈接獲取數據包
 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");
  }
  
  //打印爬取結果
  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); // 設置輸入流采用字節(jié)流
  httpConn.setDoOutput(true); // 設置輸出流采用字節(jié)流
  httpConn.setUseCaches(false); //設置緩存
  httpConn.setRequestMethod("POST");//POST請求
  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;
 }

}

以上這篇使用Post方法模擬登陸爬取網頁的實現方法就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持腳本之家。