有没有办法更快地将股票的价值获取到 Java？

如何解决有没有办法更快地将股票的价值获取到 Java？

我制作了一个简单的 Java 程序，可让您创建股票扫描仪/筛选器。目前还没有很多功能，但现有功能存在问题。我有一个类，它有一个方法来创建一个所有股票行情的数组并返回它。这是：

package classes;

import Utility.ArrayModification;
import variables.Ticker;

import java.io.*;
import java.util.Scanner;

public class Market {
    public static Ticker[] getAllTickers() throws FileNotFoundException {
        Ticker[] allTickers = {};
        File currentDirectory = new File(new File("").getAbsolutePath());
        String allTickersDirectory = currentDirectory + "\\src\\AllTickers.txt";
        Scanner scanner = new Scanner(new File(allTickersDirectory));
        while (scanner.hasNextLine()) {
            String line = scanner.nextLine();
            if(!(line.contains("^"))) {
                allTickers = ArrayModification.appendTicker(allTickers,new Ticker(line));
            }
        }
        return allTickers;
    }
}

AllTickers.txt 是一个文本文件，其中包含所有股票代码的名称。我还有另一个存储数据类型的类，Ticker。这是：

package variables;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;

public class Ticker {
    private String savedSymbol;
    public Ticker(String symbol) {
        savedSymbol = symbol;
    }
    public String getTicker() {
        return savedSymbol;
    }
    public Ticker setTicker(String symbol) {
        savedSymbol = symbol;
        return this;
    }
    public double getPrice() throws IOException {
        try {
            String stringURL = "https://markets.businessinsider.com/stocks/" + savedSymbol + "-stock";
            URL url = new URL(stringURL);
            URLConnection urlConn = url.openConnection();
            InputStreamReader inStream = new InputStreamReader(urlConn.getInputStream());
            BufferedReader buff = new BufferedReader(inStream);
            String stringPrice = "-1";
            String line = buff.readLine();
            while (line != null) {
                if (line.contains("price: ")) {
                    int target = line.indexOf("price: ");
                    int deci = line.indexOf(".",target);
                    int start = deci;
                    int stop = deci;
                    while (line.charAt(start) != ' ') {
                        start--;
                    }
                    while (line.charAt(stop) != ',') {
                        stop++;
                    }
                    stringPrice = line.substring(start + 1,stop);
                    break;
                }
                line = buff.readLine();
            }
            double price = Double.parseDouble(stringPrice);
            return price;
        }
        catch(Exception e) {
            return -1;
        }
    }
    public double getMarketCap() throws IOException {
        try {
            String stringURL = "https://finviz.com/quote.ashx?t=" + savedSymbol;
            URL url = new URL(stringURL);
            URLConnection urlConn = url.openConnection();
            InputStreamReader inStream = new InputStreamReader(urlConn.getInputStream());
            BufferedReader buff = new BufferedReader(inStream);
            String stringMarketCap = "-1";
            double finalMarketCap = -1;
            String line = buff.readLine();
            while (line != null) {
                if (line.contains(">Market Cap<")) {
                    int deci = line.indexOf(".");
                    int start = deci;
                    int stop = deci;
                    while (line.charAt(start) != '>') {
                        start--;
                    }
                    while (line.charAt(stop) != '<') {
                        stop++;
                    }
                    stringMarketCap = line.substring(start + 1,stop - 1);
                    double marketCap = Double.parseDouble(stringMarketCap);
                    if (line.charAt(stop - 1) == 'B') {
                        finalMarketCap = marketCap * 1000000000;
                    } else if (line.charAt(stop - 1) == 'M') {
                        finalMarketCap = marketCap * 1000000;
                    }
                    break;
                }
                line = buff.readLine();
            }
            return finalMarketCap;
        }
        catch(Exception e) {
            return -1;
        }
    }
}

使用所有这些，您可以创建一个简单的扫描仪，用于扫描价格在 0 - 15 之间的股票。您可以这样做：

import classes.Market; 
import variables.Ticker;

import java.io.IOException;

public class Main {
    public static void main(String[] args) throws IOException {
        Ticker[] allTickers = Market.getAllTickers();
        for(int i = 0; i< allTickers.length; i++){
            Ticker ticker = allTickers[i];
            if(ticker.getPrice() > 0 && ticker.getPrice() < 15) {
                System.out.println(ticker.getTicker());
            }
        }
    }
}

它打印出所有符合条件的股票。但是，它非常慢。太慢了，基本上无法使用。之所以这样，是因为ticker.getPrice() 方法必须连接到markets.businessinsider.com，提取HTML 代码，找到正确的索引，并获取AllTIckers.txt 中6000 只股票中每只股票的价格。有没有办法更快地做到这一点？