JSP从WebService取天气预报数据，很精简的代码[效果图]。

JSP从WebService取天气预报数据。

网上也有相关的代码，不过比较繁琐，我改进了一下。很简单地实现了。

package com.xxx.web;

import java.io.*;
import java.net.*;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class Weather {
private static String _url = "http://www.wopos.com/webservice/Weather.asmx/getWeather?mCity=";

private Weather() {
}

/**
* @param cityName
* @return
*/
private static InputStream getSoapInputStream(String cityName) {
try {
/*
* URL url = new URL(_url + cityName); HttpURLConnection hc =
* (HttpURLConnection) url.openConnection(); hc.connect();
* InputStream urlStream = hc.getInputStream(); return urlStream;
*/
return new URL(_url + cityName).openStream();
} catch (Exception ex) {
return null;
}

}

/**
* 用W3C DOM对返回的XML进行解释
* @param cityName
* @return
*/
public static String getWeatherByCityName(String cityName) {
try {
Document doc;
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setNamespaceAware(true);
DocumentBuilder db = dbf.newDocumentBuilder();
InputStream is = getSoapInputStream(cityName);
if (is == null){
return null;
}
doc = db.parse(is);
NodeList nl = doc.getElementsByTagName("string");
Node n = nl.item(0);
String weather = n.getFirstChild().getNodeValue();
is.close();
return weather;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}

/**
* @param args
*/
public static void main(String[] args) {
System.out.print(getWeatherByCityName("北京"));
}
}

得到一个String对象，剩下的就很好处理了。

最终实现效果：