java 解析网易邮箱里面的附件地址，获取下载地址

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import java.util.HashSet;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class HtmlUtils {

    public static String download_html = "http://fs.163.com/fs/display/?p=X-NETEASE-HUGE-ATTACHMENT&file=tAiok--dQS6-DVsCLRBYyI2XOe_l6T4F8OTPVps1U4pLtIVKNGH5Q2XcfF-Cypg6As-rb-qyA0G7EQ5khQc6lQ&title=%25E8%25B0%25AD%25E6%2599%25B6%25E3%2580%258A%25E4%25B9%259D%25E5%2584%25BF%25E3%2580%258B%2520-%2520%25E9%25AD%2594%25E9%25AC%25BC%25E4%25B8%25AD%25E7%259A%2584%25E5%25A4%25A9%25E4%25BD%25BF";
    
    public static void main(String[] args) throws Throwable{
        BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream("D:/h.html")));
        String line = null;
        StringBuilder sb = new StringBuilder();
        while ((line = br.readLine()) != null) {
            sb.append(line + "\n");
        }
        System.out.println(sb.toString());
        br.close();
        Pattern pHead = Pattern.compile("\"http://fs.163.com([^\"]*display[^\"]*)\"");
        Matcher mHead = pHead.matcher(sb.toString());
        System.out.println(mHead.matches());
        HashSet<String> hashSet = new HashSet<>();
         while (mHead.find()) {
            //System.out.println(mHead.group());
             String url = mHead.group().replace("\"", "").replace("&amp;", "&");
             url = URLDecoderString(url);
             hashSet.add(url);
        }
         System.out.println(hashSet.toString());
         hashSet.forEach(k->{
            try {
                downloadNetEasy(k);
            } catch (MalformedURLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        });
    }

    public static void downloadNetEasy(String url) throws IOException, MalformedURLException {
        InputStream in = new URL(url).openStream();
        //Path temp = Paths.get("D:\\temp.html");
        //Files.copy(in,temp,StandardCopyOption.REPLACE_EXISTING);
        //File file = temp.toFile();
        //System.out.println(file.getAbsolutePath());
        String download_url = "";
        BufferedReader br = new BufferedReader(new InputStreamReader(in));
        String line = null;
        while ((line = br.readLine()) != null) {
            if(line.contains("downloadlink")) {
                System.out.println(line);
                download_url = line.substring(line.indexOf("'") + 1,line.lastIndexOf("'"));
                System.out.println(download_url);
            }
        }
        //getFileName(download_url);
        //in = new URL(download_url).openStream();
        //Path temp = Paths.get("D:\\"+getFileName(download_url));
        //Files.copy(in,temp,StandardCopyOption.REPLACE_EXISTING);
        //File file = temp.toFile();
        //System.out.println(file.getAbsolutePath());
    }
    
    public static String getFileName(String urlStr){
        String fileName = null;
        int bytesum = 0;
        int byteread = 0;
        FileOutputStream fs = null;
        try {
            URL url = new URL(urlStr);
            URLConnection uc = url.openConnection();
            uc.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36");
            uc.connect();
            if(((HttpURLConnection)uc).getResponseCode()==200) {
                String file = uc.getURL().getFile();
                fileName = file.substring(file.lastIndexOf('/')+1);
            }
            //fileName = URLDecoder.decode(fileName.substring(fileName.indexOf("filename=")+9),"UTF-8");
            System.out.println("文件名为：" + fileName + "  大小" + (uc.getContentLength()/1024)+"KB");
            InputStream inStream = uc.getInputStream();
            File file = new File("D:/"+fileName);
            fs = new FileOutputStream(file);
            byte[] buffer = new byte[1204];
            while ((byteread = inStream.read(buffer)) != -1) {
                bytesum += byteread;
                System.out.println(bytesum);
                fs.write(buffer, 0, byteread);
            }
            System.out.println(file.getAbsolutePath());
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            try {
                fs.close();
            } catch (IOException e) {
            }
        }
        return fileName;
    }
    
    public static String getURLEncoderString(String str) {
        String result = "";
        if (null == str) {
            return "";
        }
        try {
            result = java.net.URLEncoder.encode(str, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return result;
    }
 
    public static String URLDecoderString(String str) {
        String result = "";
        if (null == str) {
            return "";
        }
        try {
            result = java.net.URLDecoder.decode(str, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return result;
    }
    
}