ajax 夸域取数据

package org.test;   
  
import java.io.IOException;   
import java.io.InputStream;   
import java.net.URL;   
  
import javax.servlet.ServletException;   
import javax.servlet.http.HttpServlet;   
import javax.servlet.http.HttpServletRequest;   
import javax.servlet.http.HttpServletResponse;   
  
/**  
 * Servlet implementation class TestServlet  
 */  
public class TestServlet extends HttpServlet {   
    private static final long serialVersionUID = 1L;   
  
    /**  
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)  
     */  
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {   
        URL url = new URL("http://www.iteye.com");   
        InputStream is = url.openStream();   
        byte[] b = new byte[is.available()];   
        is.read(b);   
           
        response.getOutputStream().write(b);   
        is.close();   
    }   
  
    /**  
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)  
     */  
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {   
        doGet(request, response);   
    }   
  
}  

 

在Servlet或者其他地方返回你要取得的文本流，就像这里的Javaeye一样。写入response流中，ajax就能取到了。
另外回答你的附加问题
ajax和webservice在本质上是完全不一样的东西。但是他们在不同语言的交互这点上，都用了文本流。这点是相同的