Java获取Google的简单天气预报

早上突然看到一个这样的帖子，顺便也自己写了下，现将代码贴出来，获取以后项目可以用到

 1 package com.potevio.telecom;
 2 
 3 import java.io.BufferedReader;
 4 import java.io.BufferedWriter;
 5 import java.io.File;
 6 import java.io.FileOutputStream;
 7 import java.io.IOException;
 8 import java.io.InputStream;
 9 import java.io.InputStreamReader;
10 import java.io.OutputStreamWriter;
11 import java.io.Writer;
12 import java.net.URL;
13 import java.text.DateFormat;
14 import java.util.Date;
15 
16 import javax.xml.parsers.DocumentBuilder;
17 import javax.xml.parsers.DocumentBuilderFactory;
18 
19 import org.w3c.dom.Document;
20 import org.w3c.dom.NodeList;
21 
22 /**
23  * @description 通过Java获取Google的简单天气预报
24  * @author ZhouJingxian
25  *
26  */
27 public class GetGoogleWeather {
28     
29     /**
30      * 
31      * @param cityName 注意weather那写入城市的拼音转化一下就行，
32      *                    打开之后是XML格式的然后再提取。
33      * @return
34      */
35     public String getWeather(String cityName,String fileAddr){
36         //获取google上的天气情况，写入文件
37         try{
38             URL url = new URL("http://www.google.com/ig/api?hl=zh_cn&weather="+cityName);
39             InputStream inputstream = url.openStream();
40             String s,str;
41             BufferedReader in = new BufferedReader(new  InputStreamReader(inputstream));
42             StringBuffer stringbuffer = new StringBuffer();
43             Writer out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(fileAddr),"utf-8"));
44             while((s = in.readLine())!=null){
45                 stringbuffer.append(s);
46             }
47             str = new String(stringbuffer);
48             out.write(str);
49             out.close();
50             in.close();
51         }catch(IOException e){
52             e.printStackTrace();
53         }
54         
55         //读取需要的数据
56         File file = new File(fileAddr);
57         DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
58         String str=null;
59         try{
60             DocumentBuilder builder = factory.newDocumentBuilder();
61             Document doc = builder.parse(file);
62             NodeList nodelist1 = (NodeList)doc.getElementsByTagName("forecast_conditions");
63             NodeList nodelist2 = nodelist1.item(0).getChildNodes();
64             
65             str = nodelist2.item(4).getAttributes().item(0).getNodeValue()+",temperature:"
66             +nodelist2.item(1).getAttributes().item(0).getNodeValue()+"℃-"
67             +nodelist2.item(2).getAttributes().item(0).getNodeValue()+"℃";
68         }catch(Exception e){
69             e.printStackTrace();
70         }
71         return str;
72     }
73 
74     public static void  main(String args[]){
75         GetGoogleWeather ggw = new GetGoogleWeather();
76         
77         String cityName = "beijing";
78         String fileAddr = "F:/"+cityName+".xml";
79         String temperature = ggw.getWeather(cityName,fileAddr);
80         
81         Date nowDate = new Date();
82         DateFormat dateformat = DateFormat.getDateInstance(); 
83         String today = dateformat.format(nowDate); 
84         
85         System.out.println(today+" "+cityName+"的天气情况是："+temperature);
86     }
87 }
88 

控制输出结果：
2009-7-31 beijing的天气情况是：可能有雨,temperature:16℃-31℃
文件内容（通过工具格式化了,看起来比较方便）：

 1 <?xml version="1.0"?>
 2 <xml_api_reply version="1">
 3     <weather module_id="0" tab_id="0" mobile_row="0" mobile_zipped="1"
 4         row="0" section="0">
 5         <forecast_information>
 6             <city data="beijing" />
 7             <postal_code data="beijing" />
 8             <latitude_e6 data="" />
 9             <longitude_e6 data="" />
10             <forecast_date data="2009-07-31" />
11             <current_date_time data="2009-07-31 16:32:12 +0000" />
12             <unit_system data="SI" />
13         </forecast_information>
14         <current_conditions>
15             <condition data="晴" />
16             <temp_f data="79" />
17             <temp_c data="26" />
18             <humidity data="湿度： 65%" />
19             <icon data="/ig/images/weather/sunny.gif" />
20             <wind_condition data="风向： 东、风速：2 米/秒" />
21         </current_conditions>
22         <forecast_conditions>
23             <day_of_week data="周五" />
24             <low data="16" />
25             <high data="31" />
26             <icon data="/ig/images/weather/chance_of_rain.gif" />
27             <condition data="可能有雨" />
28         </forecast_conditions>
29         <forecast_conditions>
30             <day_of_week data="周六" />
31             <low data="22" />
32             <high data="31" />
33             <icon data="/ig/images/weather/chance_of_storm.gif" />
34             <condition data="可能有暴风雨" />
35         </forecast_conditions>
36         <forecast_conditions>
37             <day_of_week data="周日" />
38             <low data="19" />
39             <high data="29" />
40             <icon data="/ig/images/weather/chance_of_storm.gif" />
41             <condition data="可能有暴风雨" />
42         </forecast_conditions>
43         <forecast_conditions>
44             <day_of_week data="周一" />
45             <low data="23" />
46             <high data="32" />
47             <icon data="/ig/images/weather/chance_of_rain.gif" />
48             <condition data="可能有雨" />
49         </forecast_conditions>
50     </weather>
51 </xml_api_reply>