java利用Jsoup庫爬取天氣

首先載入Jsoup函式庫：

第一步：下載Jsoup 函式庫下載位址

（學習影片分享：java教學影片）

下載核心庫即可

第二步：

在專案下面新建資料夾命名如下，將下載好的jar 套件拖曳到該文件中

第三個步驟：

右鍵jar 套件選擇Build Path——>Add to…

若在Referenced Libraries出現相對應的jar 包，則載入成功

實作效果：

實作程式碼：

import java.io.IOException;
import java.net.URL;
import java.util.Scanner;

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

public class dataGet {
	private static Scanner in;

	public static void main(String[] args) throws IOException {
		in = new Scanner(System.in);
		System.out.println("请输入想要查询的省会城市天气：");
		String City = in.nextLine();

		Wea(City);// 省会城市未来七天天气
	}

	public static void Wea(String City) throws IOException {

		String[] Cities = { "兰州", "101160101", "西宁", "101150101", "西安", "101110101", "郑州", "101180101", "济南",
				"101120101", "太原", "101100101", "合肥", "101220101", "长沙", "101250101", "武汉", "101200101", "南京",
				"101190101", "贵阳", "101260101", "成都", "101270101", "昆明", "101290101", "台北", "101340101", "长春",
				"101060101", "沈阳", "101070101", "福州", "101230101", "杭州", "101210101", "南昌", "101240101", "广州",
				"101280101", "海口", "101310101", "哈尔滨", "101050101", "石家庄", "101090101", };//对应城市编码，参照 中国天气网
        Boolean tem=false;//判断是否为省会城市
		String keyword = new String();
		for (int i = 0; i < 46; i += 2) {
			if (Cities[i].equals(City)) {
				keyword = Cities[i + 1];
				tem=true;
				break;
			}
		}
		if (!tem) {
			System.out.println("查无此城！");
			return;
		}
		String url = "http://www.weather.com.cn/weather/" + keyword + ".shtml";
		Document document = Jsoup.parse(new URL(url), 3000);

		// 天气获取

		Element element = document.getElementById("7d");
		Elements elements = element.getElementsByTag("li");
		for (Element el : elements) {

			Elements date = el.getElementsByTag("h1");
			String Date = City + "：" + date;
			String weather = el.getElementsByClass("wea").eq(0).text();
			String temperature = el.getElementsByClass("tem").eq(0).text();

			String Weather = Date + weather + temperature;
			if (Weather.length() > 5)
				System.out.println(Weather);

		}
	}
}

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