入门AJAX 代码

时间：2007-06-15 来源：huangpengone

最近开始学习AJAX，这是我的第一个程序，虽然也是抄的但是还是可以吧！已经开始上手了！呵呵！现在我把代码共享出来，希望和我一样在AJAX门外的人，一起努力！首行要写一个Java 类 package classmate; import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class LoginAction extends HttpServlet {

public void init(ServletConfig config) throws ServletException {
    }

    /*
     * 处理<GET> 请求方法.
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
    //设置接收信息的字符集
    request.setCharacterEncoding("UTF-8");
    //接收浏览器端提交的信息
  String uname = request.getParameter("uname");
  String psw = request.getParameter("psw");
  //设置输出信息的格式及字符集
        response.setContentType("text/xml; charset=UTF-8");
        response.setHeader("Cache-Control", "no-cache");
        //创建输出流对象
        PrintWriter out = response.getWriter();
        //依据验证结果输出不同的数据信息
        out.println("<response>");
  if(uname.equals("jenny") && psw.equals("hi")){
   out.println("<res>" + "热烈的欢迎您!" + "</res>");
  }else{
   out.println("<res>" + "对不起,登录失败！" + "</res>");
  }
  out.println("</response>");
  out.close();
    }
    /*
     * 处理<POST> 请求方法.
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
       doGet(request, response);
    }
}
下面就是页面的显示了！ <%@ page contentType="text/html;charset=UTF-8" language="java" %>
<head>
<META http-equiv=Content-Type content="text/html; charset=UTF-8">
</head>
<body vLink="#006666" link="#003366" bgColor="#E0F0F8">
<img height="33" src="enter.gif" width="148">
<form action="" method="post" name="myform">
用户名： <input size="15" name="uname"><p>
密  码： <input type="password" size="15" name="psw"><p>
<input type="button" value="登录" onClick="userCheck()" >
</form> 最后最重要的是XML的配置！     <servlet>
        <servlet-name>ms1</servlet-name>
        <servlet-class>classmate.LoginAction</servlet-class>
    </servlet>    <servlet-mapping>
        <servlet-name>ms1</servlet-name>
        <url-pattern>/login</url-pattern>
    </servlet-mapping>