Java中如何获取天气信息

import java.io.IOException;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
 
public class WeatherReport {  
      
    /** 
     * 发送请求到GOOGLE获取天气信息页面 
     * @param city 
     * @return 
     * @throws Exception 
     */ 
    @SuppressWarnings("deprecation")  
    private static String getInputStream(String city) {  
        try {  
            HttpClient httpClient = new HttpClient();
            //System.out.println("city========="+city);
            String hostUrl = "http://www.google.cn/search?hl=zh-CN&q=tq%20" + URLEncoder.encode(city);
            //System.out.println("hostUrl========="+hostUrl);
            GetMethod getMethod = new GetMethod(hostUrl);  
            // 使用系统提供的默认的恢复策略  
            getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,  new DefaultHttpMethodRetryHandler());  
            try {  
                // 执行getMethod  
                int statusCode = httpClient.executeMethod(getMethod);  
                if (statusCode != HttpStatus.SC_OK) {  
                    System.err.println("Method failed: " + getMethod.getStatusLine());  
                }  
                String result = getMethod.getResponseBodyAsString();  
                return result;  
            } catch (HttpException e) {  
                // 发生致命的异常，可能是协议不对或者返回的内容有问题  
                //System.out.println("Please check your provided http address!");  
                e.printStackTrace();  
            } catch (IOException e) {  
                // 发生网络异常  
                e.printStackTrace();  
            } finally {  
                // 释放连接  
                getMethod.releaseConnection();  
            }  
        } catch (Exception e) {  
            e.printStackTrace();  
            return null;  
        }  
        return null;  
    }  
 
    /** 
     * 将获取的包含天气页面的信息解析出相关的天气信息 
     * @param result 
     * @identifier 
     * @return 
     */ 
    public static String readText(String result, String identifier) {  
        Pattern shopNumberPattern = Pattern.compile(identifier);  
        Matcher shopNamMatcher = shopNumberPattern.matcher(result);  
        if (shopNamMatcher.find())  
            return shopNamMatcher.group(1);  
        return "";  
    }  
 
    public static String getWeather(String city) {  
        String result = readText(getInputStream(city), "<div style=\"padding:5px 5px 5px 0;float:left\">(.+?)</div></div>");  
        String weatherDetail = readText(result, "<div style=\"font-size:140%\">(.+?)%");  
        weatherDetail = weatherDetail.replaceAll("<div>", "").replaceAll("</div>", "").replaceAll("<br>", "").replace("：", ":");  
        weatherDetail = weatherDetail.replaceAll(" / ","℃～");
        weatherDetail = weatherDetail.replaceAll("<b>","");
        weatherDetail = weatherDetail.replaceAll("</b>","&nbsp;&nbsp;");
        weatherDetail = weatherDetail.replaceAll("°C","℃");
        weatherDetail = weatherDetail.replaceAll("当前: ","");
        weatherDetail = weatherDetail.replaceAll("当前:","");
        return weatherDetail;  
    }  
 
   
    public static Map getWeatherBySale(String saleName) {
            String weather = "";
            Map resMap=null;
            String city = saleName.substring(0,2);
            weather = WeatherReport.getInputStream(city);
            if (weather==null || weather.equals("")){
                    city = saleName.substring(0,3);
                    weather = WeatherReport.getInputStream(city);
                    if (weather==null || weather.equals("")){
                            city = saleName.substring(0,4);
                            weather = WeatherReport.getInputStream(city);
                    }
            }
            if (weather!=null && !weather.equals("")){
                    resMap=new HashMap();
                    weather = weather.replaceAll("\n", "").replaceAll("\t", "").replaceAll("\r", "");;
                    weather = weather.replaceAll(" ", "");
                    weather = weather.substring(0,weather.indexOf("湿度"));
//                weather = city + "&nbsp;&nbsp;" + weather;
                resMap.put("city", city);
                resMap.put("weather", weather);
            }
            return resMap;
    }
    public static void main(String args[]){
                    System.out.println(WeatherReport.getWeather("呼和浩特"));
    }
} 

也可采用第二种方式：用地一个插件
http://www.thinkpage.cn/调用该网站提供的插件模板

可以添加股票的信息 通过如下代码：
<iframe src="http://www.thinkpage.cn/stock/widget.htm?mo=1&or=1&an=1" frameborder="0" scrolling="no" width="200" height="200" allowTransparency="true"></iframe>