Springmvc框架json对象的处理

需求：我们在新添加用户的时候，在录入用户编码的时候，如果录入的用户编码和数据库中的用户编码相同的话，在鼠标失去焦点的时候，应给予相应的提示。增加用户体验。

首先引入相应的jar包，这些jar包都是由阿里巴巴团队写的。

 useradd.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@include file="/WEB-INF/jsp/common/head.jsp"%>

<div class="right">
        <div class="location">
            <strong>你现在所在的位置是:</strong>
            <span>用户管理页面 >> 用户添加页面</span>
        </div>
        <div class="providerAdd">
            <form id="userForm" name="userForm" method="post" action="${pageContext.request.contextPath }/user/useraddsave.html" enctype="multipart/form-data">
				<input type="hidden" name="method" value="add">
                <!--div的class 为error是验证错误，ok是验证成功-->
                <div>
                    <label for="userCode">用户编码：</label>
                    <input type="text" name="userCode" id="userCode" value=""> 
					<!-- 放置提示信息 -->
					<font color="red"></font>
                </div>
                <div>
                    <label for="userName">用户名称：</label>
                    <input type="text" name="userName" id="userName" value=""> 
					<font color="red"></font>
                </div>
                <div>
                    <label for="userPassword">用户密码：</label>
                    <input type="password" name="userPassword" id="userPassword" value=""> 
					<font color="red"></font>
                </div>
                <div>
                    <label for="ruserPassword">确认密码：</label>
                    <input type="password" name="ruserPassword" id="ruserPassword" value=""> 
					<font color="red"></font>
                </div>
                <div>
                    <label >用户性别：</label>
					<select name="gender" id="gender">
					    <option value="1" selected="selected">男</option>
					    <option value="2">女</option>
					 </select>
                </div>
                <div>
                    <label for="birthday">出生日期：</label>
                    <input type="text" Class="Wdate" id="birthday" name="birthday" 
					readonly="readonly" onclick="WdatePicker();">
					<font color="red"></font>
                </div>
                <div>
                    <label for="phone">用户电话：</label>
                    <input type="text" name="phone" id="phone" value=""> 
					<font color="red"></font>
                </div>
                <!-- 两个 -->
                <div>
                    <input type="hidden" id="errorinfo" value="${uploadFileError }"/>
                    <label for="a_idPicPath">证件照：</label>
                    <input type="file" name="attachs" id="a_idPicPath"> 
					<font color="red"></font>
                </div>
                   
                <div>
                    <input type="hidden" id="errorinfo_wp" value="${uploadwpFileError }"/>
                    <label for="a_workPicPath">免冠照：</label>
                    <input type="file" name="attachs" id="a_workPicPath"> 
					<font color="red"></font>
                </div>
                <div>
                    <label for="address">用户地址：</label>
                   <input name="address" id="address"  value="">
                </div>
                <div>
                    <label >用户角色：</label>
                    <!-- 列出所有的角色分类 -->
		    <!-- <select name="userRole" id="userRole"></select> -->
		    <select name="userRole" id="userRole">
			<option value="1">系统管理员</option>
			<option value="2">经理</option>
			<option value="3" selected="selected">普通用户</option>
		    </select>
	            <font color="red"></font>
                </div>
                <div class="providerAddBtn">
                    <input type="button" name="add" id="add" value="保存" >
					<input type="button" id="back" name="back" value="返回" >
                </div>
            </form>
        </div>
</div>
</section>
<%@include file="/WEB-INF/jsp/common/foot.jsp" %>
<script type="text/javascript" src="${pageContext.request.contextPath }/statics/js/useradd.js"></script>

　　useradd.js

var userCode = null;
var userName = null;
var userPassword = null;
var ruserPassword = null;
var phone = null;
var birthday = null;
var userRole = null;
var addBtn = null;
var backBtn = null;
//定義變量
var a_idPicPath=null;
var errorinfo=null;
var a_workPicPath=null;
var errorinfo_wp=null;

$(function(){
	userCode = $("#userCode");
	userName = $("#userName");
	userPassword = $("#userPassword");
	ruserPassword = $("#ruserPassword");
	phone = $("#phone");
	birthday = $("#birthday");
	userRole = $("#userRole");
	addBtn = $("#add");
	backBtn = $("#back");
    a_idPicPath=$("#a_idPicPath");
	errorinfo=$("#errorinfo");
	a_workPicPath=$("#a_workPicPath");
	errorinfo_wp=$("#errorinfo_wp");
	//初始化的时候，要把所有的提示信息变为：* 以提示必填项，更灵活，不要写在页面上
	userCode.next().html("*");
	userName.next().html("*");
	userPassword.next().html("*");
	ruserPassword.next().html("*");
	phone.next().html("*");
	birthday.next().html("*");
	userRole.next().html("*");
	
	if(errorinfo.val() == null || errorinfo.val() == ""){
		a_idPicPath.next().html("* 上传大小不能超过500K * 上传文件类型必须为：jpg、jpeg、png、pneg");
	}else{
		a_idPicPath.next().html(errorinfo.val());
	}
	
	if(errorinfo_wp.val() == null || errorinfo_wp.val() == ""){
		a_workPicPath.next().html("* 上传大小不能超过500K * 上传文件类型必须为：jpg、jpeg、png、pneg");
	}else{
		a_workPicPath.next().html(errorinfo_wp.val());
	}

	
	/*$.ajax({
		type:"GET",//请求类型
		url:path+"/jsp/user.do",//请求的url
		data:{method:"getrolelist"},//请求参数
		dataType:"json",//ajax接口（请求url）返回的数据类型
		success:function(data){//data：返回数据（json对象）
			if(data != null){
				userRole.html("");
				var options = "<option value=\"0\">请选择</option>";
				for(var i = 0; i < data.length; i++){
					//alert(data[i].id);
					//alert(data[i].roleName);
					options += "<option value=\""+data[i].id+"\">"+data[i].roleName+"</option>";
				}
				userRole.html(options);
			}
		},
		error:function(data){//当访问时候，404，500 等非200的错误状态码
			validateTip(userRole.next(),{"color":"red"},imgNo+" 获取用户角色列表error",false);
		}
	});*/
	
	
	
	/*
	 * 验证
	 * 失焦\获焦
	 * jquery的方法传递
	 */
	userCode.bind("blur",function(){
		//ajax后台验证--userCode是否已存在
		//user.do?method=ucexist&userCode=**
		$.ajax({
			type:"GET",//请求类型
			url:path+"/user/ucexist.html",//请求的url
			data:{userCode:userCode.val()},//请求参数
			dataType:"json",//ajax接口（请求url）返回的数据类型
			success:function(data){//data：返回数据（json对象）
				if(data.userCode == "exist"){//账号已存在，错误提示
					validateTip(userCode.next(),{"color":"red"},imgNo+ " 该用户账号已存在",false);
				}else{//账号可用，正确提示
					validateTip(userCode.next(),{"color":"green"},imgYes+" 该账号可以使用",true);
				}
			},
			error:function(data){//当访问时候，404，500 等非200的错误状态码
				validateTip(userCode.next(),{"color":"red"},imgNo+" 您访问的页面不存在",false);
			}
		});
		
		
	}).bind("focus",function(){
		//显示友情提示
		validateTip(userCode.next(),{"color":"#666666"},"* 用户编码是您登录系统的账号",false);
	}).focus();
	
	userName.bind("focus",function(){
		validateTip(userName.next(),{"color":"#666666"},"* 用户名长度必须是大于1小于10的字符",false);
	}).bind("blur",function(){
		if(userName.val() != null && userName.val().length > 1
				&& userName.val().length < 10){
			validateTip(userName.next(),{"color":"green"},imgYes,true);
		}else{
			validateTip(userName.next(),{"color":"red"},imgNo+" 用户名输入的不符合规范，请重新输入",false);
		}
		
	});
	
	userPassword.bind("focus",function(){
		validateTip(userPassword.next(),{"color":"#666666"},"* 密码长度必须是大于6小于20",false);
	}).bind("blur",function(){
		if(userPassword.val() != null && userPassword.val().length > 6
				&& userPassword.val().length < 20 ){
			validateTip(userPassword.next(),{"color":"green"},imgYes,true);
		}else{
			validateTip(userPassword.next(),{"color":"red"},imgNo + " 密码输入不符合规范，请重新输入",false);
		}
	});
	
	ruserPassword.bind("focus",function(){
		validateTip(ruserPassword.next(),{"color":"#666666"},"* 请输入与上面一只的密码",false);
	}).bind("blur",function(){
		if(ruserPassword.val() != null && ruserPassword.val().length > 6
				&& ruserPassword.val().length < 20 && userPassword.val() == ruserPassword.val()){
			validateTip(ruserPassword.next(),{"color":"green"},imgYes,true);
		}else{
			validateTip(ruserPassword.next(),{"color":"red"},imgNo + " 两次密码输入不一致，请重新输入",false);
		}
	});
	
	
	birthday.bind("focus",function(){
		validateTip(birthday.next(),{"color":"#666666"},"* 点击输入框，选择日期",false);
	}).bind("blur",function(){
		if(birthday.val() != null && birthday.val() != ""){
			validateTip(birthday.next(),{"color":"green"},imgYes,true);
		}else{
			validateTip(birthday.next(),{"color":"red"},imgNo + " 选择的日期不正确,请重新输入",false);
		}
	});
	
	phone.bind("focus",function(){
		validateTip(phone.next(),{"color":"#666666"},"* 请输入手机号",false);
	}).bind("blur",function(){
		var patrn=/^(13[0-9]|15[0-9]|18[0-9])\d{8}$/;
		if(phone.val().match(patrn)){
			validateTip(phone.next(),{"color":"green"},imgYes,true);
		}else{
			validateTip(phone.next(),{"color":"red"},imgNo + " 您输入的手机号格式不正确",false);
		}
	});
	
	userRole.bind("focus",function(){
		validateTip(userRole.next(),{"color":"#666666"},"* 请选择用户角色",false);
	}).bind("blur",function(){
		if(userRole.val() != null && userRole.val() > 0){
			validateTip(userRole.next(),{"color":"green"},imgYes,true);
		}else{
			validateTip(userRole.next(),{"color":"red"},imgNo + " 请重新选择用户角色",false);
		}
	});
	
	addBtn.bind("click",function(){
		/*if(userCode.attr("validateStatus") != "true"){
			userCode.blur();
		}else */if(userName.attr("validateStatus") != "true"){
			userName.blur();
		}else if(userPassword.attr("validateStatus") != "true"){
			userPassword.blur();
		}else if(ruserPassword.attr("validateStatus") != "true"){
			ruserPassword.blur();
		}else if(birthday.attr("validateStatus") != "true"){
			birthday.blur();
		}else if(phone.attr("validateStatus") != "true"){
			phone.blur();
		}/*else if(userRole.attr("validateStatus") != "true"){
			userRole.blur();
		}*/else{
			if(confirm("是否确认提交数据")){
				$("#userForm").submit();
			}
		}
	});
	
	backBtn.on("click",function(){
		if(referer != undefined 
			&& null != referer 
			&& "" != referer
			&& "null" != referer
			&& referer.length > 4){
		 window.location.href = referer;
		}else{
			history.back(-1);
		}
	});
});

　　编写UserController.java

 最终的运行结果：