使用onblur来验证用户名。是否被注册过...

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ajax.jsp 2010-05-10

<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
<script type="text/javascript">
function upperCase(nameValue){

QueryServlet.java

package com.zuxia.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.zuxia.dao.LoginDao;
import com.zuxia.entity.LoginEntity;

public class QueryServlet extends HttpServlet {

/**
* Constructor of the object.
*/
public QueryServlet() {
super();
}

/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}

/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

doPost(request, response);
}

/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

  response.setContentType("text/html");
  response.setCharacterEncoding("utf-8");
  String name=request.getParameter("username");
  LoginDao loginDao=new LoginDao();
  List<LoginEntity> loginList=loginDao.loginList(name);
  for (LoginEntity loginEntity : loginList) {
   String a=loginEntity.getPassword();
   PrintWriter out=response.getWriter();
   if(a!=null){
    out.println(1);
   }else{
    out.print(0);
   }
   out.flush();
   out.close();
  }
}

/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}

}

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