java如何调用http接口

1.

import java.net.*;
import java.io.*;

public class URLReader {
    public static void main(String[] args) throws Exception {
 URL yahoo = new URL("http://www.baidu.com/query.jsp?param1=value2&param2=value2");
 BufferedReader in = new BufferedReader(
    new InputStreamReader(
    yahoo.openStream()));

 String inputLine;

 while ((inputLine = in.readLine()) != null)
     System.out.println(inputLine);

 in.close();
    }
}

2.

DOM4J的工具，来解析读取到的 xml格式的数据