java URL 访问远程地址，得到 xml 数据....

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通过Java获取Google的简单天气预报

先保存文件。再读文件。不然有编码转换的异常..再找好的方法。

http://www.google.com/ig/api?hl=zh_cn&weather=shanghai

注意weather那写入城市的拼音转化一下就行打开之后是XML格式的然后再提取。

package com.test;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.net.MalformedURLException;
import java.net.URL;

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

import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
/***
* 通过Java获取Google的简单天气预报
* @author wei
*
*/
public class WeatherReport {

/***
*
* @param city 城市拼音：上海,shanghai
* @return 例如：可能有暴风雨,23℃-29℃
*/
public static String getweather(String city) {

  try {
   URL ur = new URL("http://www.google.com/ig/api?hl=zh_cn&weather="
     + city);
   InputStream instr = ur.openStream();
   String s, str;
   BufferedReader in = new BufferedReader(new InputStreamReader(instr));
   StringBuffer sb = new StringBuffer();
   Writer out = new BufferedWriter(new OutputStreamWriter(
     new FileOutputStream("weather.txt"), "utf-8"));
   while ((s = in.readLine()) != null) {
    sb.append(s);
   }
   str = new String(sb);
   out.write(str);
   out.close();
   in.close();

  } catch (MalformedURLException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }

  File f = new File("weather.txt");
  DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
  String str = null;

  try {
   DocumentBuilder builder = factory.newDocumentBuilder();
   Document doc = builder.parse(f);
   NodeList nl = (NodeList) doc
     .getElementsByTagName("forecast_conditions");
   NodeList n2 = nl.item(0).getChildNodes();

   str = n2.item(4).getAttributes().item(0).getNodeValue() + ","
     + n2.item(1).getAttributes().item(0).getNodeValue() + "℃-"
     + n2.item(2).getAttributes().item(0).getNodeValue() + "℃";

  } catch (ParserConfigurationException e) {
   e.printStackTrace();
  } catch (SAXException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }

  return str;
}

public static void main(String[] args) {
  String str = WeatherReport.getweather("zhuzhou");
  System.out.println(str);
}
}