分享ajax三种实现方法

package ajax.servlet; 
import java.io.IOException; 
import java.io.PrintWriter; 
import javax.servlet.ServletException; 
import javax.servlet.http.HttpServlet; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
/** 
 * Ajax例子后台处理程序 
 * @author bing 
 * @version 2011-07-07 
 * 
 */
public class TestAjaxServlet extends HttpServlet { 
 public void doGet(HttpServletRequest request, HttpServletResponse response) 
 throws ServletException, IOException { 
 response.setContentType("text/html;charset=utf-8"); 
 PrintWriter out = response.getWriter(); 
 String name = request.getParameter("name"); 
 String age = request.getParameter("age"); 
 System.out.println("{\"name\":\"" + name + "\",\"age\":\"" + age + "\"}"); 
 out.print("{\"name\":\"" + name + "\",\"age\":" + age + "}"); 
 out.flush(); 
 out.close(); 
 } 
 public void doPost(HttpServletRequest request, HttpServletResponse response) 
 throws ServletException, IOException { 
 doGet(request,response); 
 } 
}

显示区域 
 
 name:
 
 age: