Java URL 访问远程地址 得到xml数据-

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。

代码如下：

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);
    }
}

转自：http://blog.csdn.net/zhaoweitco/article/details/5683588