Ajax简要说明及实例

ajaxServlet.java程序清单:

package com;

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;

/*
 *------------------------------------------------------
 * 文件名: ajaxServlet.java
 * 创建日期: 2005-10-25
 * 原作者: miaohai
 * 版权所有:  miaohai
 * 功能说明: 生成XML文档
 *
 * 修改记录:N/A
 *------------------------------------------------------
 */

public class ajaxServlet
    extends HttpServlet
{
        private static final String CONTENT_TYPE="text/xml; charset=gb2312";
        public void init()
            throws ServletException
        {
        }

        public void doGet(HttpServletRequest request,
                          HttpServletResponse response)
            throws ServletException,IOException
        {
                response.setContentType(CONTENT_TYPE);
                PrintWriter out=response.getWriter();
                String action=request.getParameter("action");
                if(("send").equals(action))
                {
                        StringBuffer sb=new StringBuffer("<type>");
                        sb.append("<type_name>AA</type_name>");
                        sb.append("<type_name>BB</type_name>");
                        sb.append("<type_name>CC</type_name>");
                        sb.append("<type_name>DD</type_name>");
                        sb.append("</type>");