public class HttpUtils {
    private static Logger log = LoggerFactory.getLogger(HttpUtils.class);

    public static String sendGet(String url, String param, String contentType){
        StringBuilder result = new StringBuilder();
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            URLConnection connection = realUrl.openConnection();
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            connection.connect();
            in = new BufferedReader(new InputStreamReader(connection.getInputStream(), contentType));
            String line;
            while ((line = in.readLine()) != null)
            {
                result.append(line);
            }
        } catch (Exception e) {
            log.error("获取地址失败：{}",e.toString());
        }
        return result.toString();
    }
}

参考自：http://blog.csdn.net/daydayupzzc/article/details/38866489

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;

public class Url {

    public static void main(String[] args) throws Exception {
        String url="http://flash.weather.com.cn/wmaps/xml/chengdu.xml";
        getData(url);
    }

    public static String getData(String urlString) throws Exception {
        String res = "";
        BufferedReader reader = null;
        try {
            URL url = new URL(urlString);
            URLConnection conn = (URLConnection)url.openConnection();
            reader = new BufferedReader(new InputStreamReader(conn.getInputStream(),"UTF-8"));
            System.out.println("创建url!");
            String line;
            while ((line = reader.readLine()) != null) {
                System.out.println("分别获取每行内容！："+line);
                res += line;
            }
            reader.close();
        } catch (Exception e) {
            e.getMessage();
        }
        System.out.println(res);
        return res;
    }
}

返回结果：

原网页内容：

接下来就可以解析其中自己需要的内容了（上面例子中返回的数据是xml格式的字符串，如果需要返回数据流请参考上面原教程）