ajax用户名验证和登录方法的整合

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1.定义Dao层方法

package com.tcc.dao;

import java.util.List;

import com.tcc.bean.User;

public interface usermapper {

public User list(String name);
}

2.Controller

package com.tcc.controller;

import java.util.List;

import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;

import com.tcc.bean.User;
import com.tcc.service.userservice;

@Controller
@RequestMapping("user")
public class controller {

@Autowired
private userservice us;
@ResponseBody
@RequestMapping("list")
public int list(String name){
User list = us.list(name);
if (list!=null) {
return 0;
}
else {
return 1;
}
}
}

3.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">

<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-1.8.3.js"></script>
<script type="text/javascript">
$(function(){
$("#sub").blur(function(){
$("#sp").empty();
if ($("#sub").val()==null||$("#sub").val()=="") {
var span=$("<span id='sp'>用户名不能为空!</span>");
$("#sub").after(span);
}
else {

$.post("${pageContext.request.contextPath}/user/list","name="+$("#sub").val(),
function(ba){
$("#ss").empty();
$("#s").empty();
if (ba==0) {
var ssr=$("<span id='ss'>用户名已被注册!</span>");
$("#sub").after(ssr);
}
else {
var ss=$("<span id='s'>用户名可以使用!</span>");
$("#sub").after(ss);
}
},"json");
}
});
$("#bu").click(function(){
$.post("${pageContext.request.contextPath}/user/add",$("form").serialize(),
function(ba){
if (ba==0) {
alert("添加失败");
}
else {
alert("添加成功");
location.href="${pageContext.request.contextPath}/user/**";
}
},"json");

});
});
</script>
</head>

<body>
<form>
用户名:<input type="text" id="sub" name="name"><br>
密码:<input type="password" name="pwd"><br>
<input type="button" value="提交" id="bu">
</form>
</body>
</html>

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