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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(wǎng)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(wǎng)站后 請求POST_URL鏈接獲取cookie
 private static final String COOKIE = "";
 
 //用賬號登錄某網(wǎng)站后 請求POST_URL鏈接獲取數(shù)據(jù)包
 private static final String REQUEST_DATA = "";
 
 public static void main(String[] args) throws Exception {
  HashMap 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(jié)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); // 設(shè)置輸入流采用字節(jié)流
  httpConn.setDoOutput(true); // 設(shè)置輸出流采用字節(jié)流
  httpConn.setUseCaches(false); //設(shè)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;
 }

}

分享文章：使用Post方法模擬登陸爬取網(wǎng)頁的實現(xiàn)方法-創(chuàng)新互聯(lián)
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