如何添加運行時超時以防止 java.net.SocketTimeoutException？ (How do I add a runtime timeout to prevent java.net.SocketTimeoutException?)

問題描述

如何添加運行時超時以防止 java.net.SocketTimeoutException？ (How do I add a runtime timeout to prevent java.net.SocketTimeoutException?)

所以我有一個程序可以從 Yelp 中提取商業信息並輸出。一切都會編譯並運行一段時間，直到最終遇到 java.net.SocketTimeoutException。我對此問題進行了一些研究，顯然這是網絡問題，解決方案是添加運行時超時。事情就是這樣，我不知道這是如何完成的，也不知道如何在我的代碼中實現它。這是我得到的：

import java.util.ArrayList;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import java.io.IOException;
import java.util.Scanner;

public class YelpScraper
{
    public static void main(String[] args) throws IOException, Exception, RuntimeException
    {        
        //Variables
        String description;
        String location;
        int pages;
        int parseCount = 0;
        Document document;

        Scanner keyboard = new Scanner(System.in);

        //Perform a Search
        System.out.print("Enter a description: ");
        description = keyboard.nextLine();

        System.out.print("Enter a state: ");
        location = keyboard.nextLine();

        System.out.print("How many pages should we scan? ");
        pages = keyboard.nextInt();

        String descString = "find_desc=" + description.replace(' ', '+') + "&";
        String locString = "find_loc=" + location.replace(' ', '+') + "&";
        int number = 0;

        String url = "https://www.yelp.com/search?" + descString + locString + "start=" + number;
        ArrayList<String> names = new ArrayList<String>();
        ArrayList<String> address = new ArrayList<String>();
        ArrayList<String> phone = new ArrayList<String>();

        //Fetch Data From Yelp
        for (int i = 0 ; i <= pages ; i++)
        {

            document = Jsoup.connect(url).get();

            Elements nameElements = document.select(".indexed‑biz‑name span");
            Elements addressElements = document.select(".secondary‑attributes address");
            Elements phoneElements = document.select(".biz‑phone");

            for (Element element : nameElements)
            {
                names.add(element.text());
            }

            for (Element element : addressElements)
            {
                address.add(element.text());
            }

            for (Element element : phoneElements)
            {
                phone.add(element.text());
            }

            for (int index = 0 ; index < 10 ; index++)
            {
                System.out.println("\nLead " + parseCount);
                System.out.println("Company Name: " + names.get(parseCount));
                System.out.println("Address: " + address.get(parseCount));
                System.out.println("Phone Number: " + phone.get(parseCount));

                parseCount = parseCount + 1;
            }

            number = number + 10;

        }
    }
}

我需要做什麼來添加運行時超時？

參考解法

方法 1:

You can always use timeout like in this doc:

https://jsoup.org/cookbook/input/load‑document‑from‑url

like this:

document = Jsoup.connect(url).timeout(3000).get();

(by Brandon Woodruff、JFPicard)

參考文件

1. How do I add a runtime timeout to prevent java.net.SocketTimeoutException? (CC BY‑SA 2.5/3.0/4.0)