本期博客内容应该不算多，我们此次的目的是通过正则表达式并利用ajax可以实现动态交互的特点，检验注册的用户名以及密码是否合法。

Entity层

该层主要包含一个用户类User,代码如下：

package cn.cpx.springmvc.entity;
import java.util.Date;
/**
 * 用户实体类
 * @author autumn_leaf
 *
 */
public class User {
 
 private int uId;
 private String uName;
 private String uPwd;
 private String uPhone;
 private double uBalance;
 private int uState;
 private int uRole;
 private String uImage;//用户头像
 private Date uBirth;
 
 public int getuId() {
 return uId;
 }
 public void setuId(int uId) {
 this.uId = uId;
 }
 public String getuName() {
 return uName;
 }
 public void setuName(String uName) {
 this.uName = uName;
 }
 public String getuPwd() {
 return uPwd;
 }
 public void setuPwd(String uPwd) {
 this.uPwd = uPwd;
 }
 public String getuPhone() {
 return uPhone;
 }
 public void setuPhone(String uPhone) {
 this.uPhone = uPhone;
 }
 public double getuBalance() {
 return uBalance;
 }
 public void setuBalance(double uBalance) {
 this.uBalance = uBalance;
 }
 public int getuState() {
 return uState;
 }
 public void setuState(int uState) {
 this.uState = uState;
 }
 public int getuRole() {
 return uRole;
 }
 public void setuRole(int uRole) {
 this.uRole = uRole;
 }
 
 public String getuImage() {
 return uImage;
 }
 public void setuImage(String uImage) {
 this.uImage = uImage;
 }
 
 public Date getuBirth() {
 return uBirth;
 }
 public void setuBirth(Date uBirth) {
 this.uBirth = uBirth;
 }
 
 public User(int uId, String uName, String uPwd, String uPhone, double uBalance, int uState, int uRole,String uImage,Date uBirth) {
 super();
 this.uId = uId;
 this.uName = uName;
 this.uPwd = uPwd;
 this.uPhone = uPhone;
 this.uBalance = uBalance;
 this.uState = uState;
 this.uRole = uRole;
 this.uImage = uImage;
 this.uBirth = uBirth;
 }
 public User() {
 super();
 }
 public User(String uName, String uPwd, String uPhone) {
 super();
 this.uName = uName;
 this.uPwd = uPwd;
 this.uPhone = uPhone;
 }
 
 //添加注册信息
 public User(String uName, String uPwd, String uPhone, Date uBirth) {
 super();
 this.uName = uName;
 this.uPwd = uPwd;
 this.uPhone = uPhone;
 this.uBirth = uBirth;
 }
 
 public User(String uName, String uPwd, String uPhone, String uImage) {
 super();
 this.uName = uName;
 this.uPwd = uPwd;
 this.uPhone = uPhone;
 this.uImage = uImage;
 }
 
 public User(String uName, String uPwd) {
 super();
 this.uName = uName;
 this.uPwd = uPwd;
 }
 @Override
 public String toString() {
 return "User [uId=" + uId + ", uName=" + uName + ", uPwd=" + uPwd + ", uPhone=" + uPhone + ", uBalance="
  + uBalance + ", uState=" + uState + ", uRole=" + uRole + ", uImage=" + uImage + ", uBirth=" + uBirth
  + "]";
 }
}

上述User类我们实际此次只会用到用户名和密码两个属性，其他属性此次不会使用到。

Controller层

我们此次为操作方便，Dao层和Service层就不写了，留给读者自己去思考。我们新建UserController类，代码如下：

package cn.cpx.springmvc.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import cn.cpx.springmvc.entity.User;
@Controller
@RequestMapping("/user")
public class UserController {
 /**
 * 根据输入的用户名查询用户名是否存在,实现前台输入用户名及时验证
 */
 @RequestMapping("/checkUname")
 @ResponseBody
 public String checkUname(User user) throws Exception {
 //根据user(前台输入的用户名)查询数据库中用户名
 //下面的判断最好写在Service中
 //使用String result = userService.checkUname(user);
 if("chen".equals(user.getuName())) {
  return "{\"msg\":\"no\"}";
 }
 return "{\"msg\":\"ok\"}";
 }
}