Question

我想从url中读取csv文件（股票数据），但是起始日期和结束日期可变（作为输入），有什么办法可以做到？我已经使用静态日期完成了此操作，但是我已经开始了，但无法继续。

import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.GregorianCalendar;
import java.util.Scanner;


public class StockData {

    public StockData(String symbol, GregorianCalendar start, GregorianCalendar end) {

        String url = "https://quotes.wsj.com/fx/AEDUSD/historical-prices/download?MOD_VIEW=page&num_rows=300&startDate=12/01/2017&endDate=12/26/2018";

        try {
            URL rowdata = new URL(url);
            URLConnection data = rowdata.openConnection();
            Scanner input = new Scanner(data.getInputStream());
            if (input.hasNext())
                input.nextLine();

            while (input.hasNextLine()) {
                String line = input.nextLine();
                System.out.println(line);
            }
        }
        catch (Exception e) {
            System.out.print(e);
        }
    }

    public static void main(String[] args) {
        String symbol = new String();
        GregorianCalendar start = new GregorianCalendar(2018, 12, 12);
        GregorianCalendar end = new GregorianCalendar(2018, 12, 18);
        StockData test = new StockData(symbol, start, end);
    }
}

Answer 1

我在这里代表这个主意，因此您可以进行编码，因为这些更改非常少

首先使用`Scanner对象，该对象会读取用户的输入

public static void main(String[] args) {
    String symbol = new String(); //no need this
    Scanner sc = new Scanner(System.in):
    //read user input using scanner object
    String start = //user input
    String end = //user input
    StockData test = new StockData(symbol, start, end);
}

在StockData构造函数（此方法称为构造函数而不是方法）中，只需将endDate和startDate附加到url

public StockData(String symbol, String start, String end) {

    String url = "https://quotes.wsj.com/fx/AEDUSD/historical-prices/download?MOD_VIEW=page&num_rows=300&startDate="+start+"+&endDate="+end;

    try {
        URL rowdata = new URL(url);
        URLConnection data = rowdata.openConnection();
        Scanner input = new Scanner(data.getInputStream());
        if (input.hasNext()) // remove
            input.nextLine();  //remove

        while (input.hasNextLine()) {
            String line = input.nextLine();
            System.out.println(line);
        }
    }
    catch (Exception e) {
        System.out.print(e);
    }
}

从URL读取CSV文件

1 个答案: