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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<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(jié)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(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;
}
}
網(wǎng)頁標(biāo)題:使用Post方法模擬登陸爬取網(wǎng)頁的實(shí)現(xiàn)方法-創(chuàng)新互聯(lián)
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