JSP從WebService取天氣預報資料，很精簡的代碼[效果圖]。

JSP從WebService取天氣預報資料。

網上也有相關的代碼，不過比較繁瑣，我改進了一下。很簡單地實現了。

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對返回的XML進行解釋
  * @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"));
 }
}

得到一個String對象，剩下的就很好處理了。

最終實現效果：