我制作了一个 java 应用程序,向用户提供天气状况通知。我使用了 yahoo 提供的 yahoo 天气 API,就像那个链接:
http://weather.yahooapis.com/forecastrss?w=2502265
我所要做的就是更改 URL 中的八位代码以更改城市。
这很完美,但我现在面临两个问题:
第一个,我想在我的应用程序中实现很多天气预报源,而不仅仅是雅虎天气,我在任何其他天气预报网站都找不到类似的服务。
第二个,我想获取雅虎天气中所有城市的代码,因为我不会要求用户输入他的城市代码,而是输入他的城市名称,我会与代码匹配。
这是在java中与我一起使用的代码:
返回 XML 文件的代码:
package search;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringWriter;
import java.net.URL;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
public class Process {
public static void main(String[] args) throws IOException {
Display disp = new Display();
Document doc = generateXML("1940345");
disp.getConditions(doc);
}
public static Document generateXML(String code) throws IOException {
String url = null;
String XmlData = null;
// creating the URL
url = "http://weather.yahooapis.com/forecastrss?w=" + code;
URL xmlUrl = new URL(url);
InputStream in = xmlUrl.openStream();
// parsing the XmlUrl
Document doc = parse(in);
return doc;
}
public static Document parse(InputStream is) {
Document doc = null;
DocumentBuilderFactory domFactory;
DocumentBuilder builder;
try {
domFactory = DocumentBuilderFactory.newInstance();
domFactory.setValidating(false);
domFactory.setNamespaceAware(false);
builder = domFactory.newDocumentBuilder();
doc = builder.parse(is);
} catch (Exception ex) {
System.err.println("unable to load XML: " + ex);
}
return doc;
}
}
显示该城市温度和湿度的代码:
package search;
import java.io.File;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
public class Display {
static void getConditions(Document doc) {
String city = null;
String unit = null;
try {
doc.getDocumentElement().normalize();
NodeList nList = doc.getElementsByTagName("rss");
for (int temp = 0; temp < nList.getLength(); temp++) {
Node nNode = nList.item(temp);
if (nNode.getNodeType() == Node.ELEMENT_NODE) {
Element eElement = (Element) nNode;
NodeList nl = eElement
.getElementsByTagName("yweather:location");
for (int tempr = 0; tempr < nl.getLength(); tempr++) {
Node n = nl.item(tempr);
if (nNode.getNodeType() == Node.ELEMENT_NODE) {
Element e = (Element) n;
city = e.getAttribute("city");
System.out.println("The City Is : " + city);
}
}
NodeList nl2 = eElement
.getElementsByTagName("yweather:units");
for (int tempr = 0; tempr < nl2.getLength(); tempr++) {
Node n2 = nl2.item(tempr);
if (nNode.getNodeType() == Node.ELEMENT_NODE) {
Element e2 = (Element) n2;
unit = e2.getAttribute("temperature");
}
}
NodeList nl3 = eElement
.getElementsByTagName("yweather:condition");
for (int tempr = 0; tempr < nl3.getLength(); tempr++) {
Node n3 = nl3.item(tempr);
if (nNode.getNodeType() == Node.ELEMENT_NODE) {
Element e3 = (Element) n3;
System.out.println("The Temperature In " + city
+ " Is : " + e3.getAttribute("temp") + " "
+ unit);
}
}
NodeList nl4 = eElement
.getElementsByTagName("yweather:atmosphere");
for (int tempr = 0; tempr < nl4.getLength(); tempr++) {
Node n4 = nl4.item(tempr);
if (nNode.getNodeType() == Node.ELEMENT_NODE) {
Element e4 = (Element) n4;
System.out.println("The Humidity In " + city
+ " Is : " + e4.getAttribute("humidity"));
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}