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example1.html

      
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web.xml添加如下代码

       
    
     AjaxServlet
        
    
     ajax.AjaxServlet
      
     
       
    
     AjaxServlet
        
    
     /ajax/AjaxServlet
      
   

AjaxServlet.java

package ajax;import java.io.IOException;import java.io.PrintWriter;import java.text.SimpleDateFormat;import java.util.Date;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * Servlet implementation class AjaxServlet */@WebServlet("/AjaxServlet")public class AjaxServlet extends HttpServlet {	private static final long serialVersionUID = 1L;           /**     * @see HttpServlet#HttpServlet()     */    public AjaxServlet() {        super();        // TODO Auto-generated constructor stub    }	/**	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)	 */	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {		// TODO Auto-generated method stub		doPost(request, response);	}	/**	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)	 */	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {		// TODO Auto-generated method stub		 response.setCharacterEncoding("utf-8"); 		 response.setContentType("text/html");		 String user=request.getParameter("v1");		 String password=request.getParameter("v2");		 int flag=0;		 if(user.equals("123") && password.equals("123"))			 flag=1;	        System.out.println("ajax后台交互成功");  	        PrintWriter write=response.getWriter();	        write.println(flag);	        System.out.println(user+" "+password);	        write.flush();	}}