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\"}"; } }
加上@ResponseBody注解，是为了确保返回JSON形式的数据，我们返回列表形式的字符串，并进行转义，如果用户名已经存在(这里仅有chen)，则返回msg:no，相反，返回msg:ok。
视图层
我们新建register.jsp,代码如下：
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> <script type="text/javascript" src="https://www.jb51.net/${pageContext.request.contextPath}/js/jquery-1.8.3.js"></script> <script> //使用功能DOM对象获取表单信息 function checkName() { //console.log(1); var name = document.getElementById("uname").value; //console.log("用户名:"+name); //console.log(document.getElementById("uname").placeholder); //根据用户输入内容,完成页面验证,用户名只能是0-9,a-z,A-Z,也可以输入中文 //综合正则表达式验证 var unameCode = /^[0-9A-z\u4e00-\u9fa5]{3,10}$/; if (unameCode.test(name)) { console.log("用户名命名合法!"); //还要和后台进行验证,验证用户名是否重复,使用Ajax动态交互 $.ajax({ type : 'post', url : 'user/checkUname.action',//请求的url地址,建议使用绝对地址 data : 'uName='+name,//请求携带的参数 dataType:'json',//如果后台返回的数据是String改造的,这里需要指定返回类型,否则data.msg取不到值 success : function(data) {//sucess中function的data可以解析后台的数据 console.log(data); console.log(data.msg); if("ok" == data.msg) { document.getElementById("unameMsg").innerHTML = "<font color='green'>√用户名合法!</font>"; }else { document.getElementById("unameMsg").innerHTML = "<font color='red'>×用户名重复!</font>"; } }, error : function() {//失败回调函数 console.log("解析失败!"); } }); //document.getElementById("unameMsg").innerHTML = "<font color='orange'>√用户名合法!</font>"; } else { console.log("命名不合法!"); //document.getElementById("unameMsg").innerHTML = "<font color='orange'>×用户名不合法!</font>"; document.getElementById("unameMsg").innerHTML = "x 用户名不合法!"; //使用JS可以改变CSS的样式 document.getElementById("unameMsg").style.color = "red"; document.getElementById("unameMsg").style.fontSize = "20px"; } } //失去焦点事件 function checkPwd() { var pwd = document.getElementById("upwd").value; //强密码(必须包含大小写字母和数字的组合,不能使用特殊字符,长度在6-12之间) var upwdCode = /^(?=.*\d)(?=.*[a-z])(?=.*[A-Z])[a-zA-Z0-9]{6,12}$/; if (upwdCode.test(pwd)) { document.getElementById("upwdMsg").innerHTML = "<font color='blue'>√密码合法!</font>"; } else { document.getElementById("upwdMsg").innerHTML = "<font color='blue'>×密码不合法!</font>" } } </script> </head> <body> <form method="post"> <input type="text" placeholder="请输入用户名" onkeyup="checkName()" /> <span></span><br /> <input type="password" placeholder="请输入密码" onblur="checkPwd()" /> <span></span><br/> </form> </body> </html>
以上的代码我们进行一些解释：