使用Post方法模拟登陆爬取网页的实现方法
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2024-03-02 20:58:16
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;...
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; } }
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