用JQuery来写Ajax

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下面是用Javascript来写的ajax代码

用JQuery来写的话
第一种写法：

第二种写法：

body里的是：

   +
   
   
   

servlet里的处理

package com.niit.test;

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;

public class Suanfa extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException 
			{
				doPost(request, response);			
			}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException 
			{
				int num1=Integer.parseInt(request.getParameter("add1"));
				int num2=Integer.parseInt(request.getParameter("add2"));
				int result=num1+num2;
				
				response.setHeader("pragma", "no-cache");
				response.setHeader("cache-control", "no-cache");
				
				response.setContentType("text/html");
				PrintWriter out=response.getWriter();
				out.print(result);
				out.flush();
				out.close();
			}

}

第二种写法在学完JQuery后用的最多。