正则表达式抓取文件内容中的http链接地址

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

//正则表达式抓取网页数据

public class HtmlAddressCatch {
public static void main(String[] args) {

  String webaddress = "https://www.zhihu.com/people/Akira_Dunn";
  HtmlAddressCatch.getWebTextContent(webaddress);
  /*String localaddress = "D:\\test\\test.html";
  String targetaddress = "D:\\test\\http.txt";
  HtmlAddressCatch.getLocalTextContent(localaddress , targetaddress);*/

}

//给定http链接抓取地址

public static void getWebTextContent(String webaddress){	

try {

URL url = new URL(webaddress);

HttpURLConnection con = (HttpURLConnection)url.openConnection();

FileOutputStream file = new FileOutputStream("D:\text.txt");

InputStreamReader read = new InputStreamReader(con.getInputStream());//使用InputStreamReader是为了将InputStream字节流转换成为字符流，一次读取更多的字节

BufferedReader packetreader = new BufferedReader(read);//使用BufferedReader是为了在InputStreamReader的基础上一次读取更多的字节

int i=0;

String regex = "https?