后台系统的所有界面图以及之前的准备工作欢迎看我之前的博文>3<
具体的代码未来将传到csdn下载或github下载~
有任何问题欢迎下方评论=W=
一、图片效果
①项目目录图1与图2
②登录模块图
③注册模块图
二、设置字符集过滤器
①Java Resources的src-->建立package,命名为filter-->创建一个DoFilter的java文件,具体代码如下
(PS.这个过滤器我也是仿照csdn一个老哥的做的,在此感谢这位老哥>3<)
DoFilter.java文件:
package filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
public class DoFilter implements Filter {
public DoFilter(){
System.out.println("过滤器构造");
}
public void destroy() {
System.out.println("过滤器销毁");
}
public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException {
request.setCharacterEncoding("utf-8"); //将编码改为utf-8
response.setContentType("text/html;charset=utf-8");
chain.doFilter(request, response);
}
public void init(FilterConfig arg0) throws ServletException {
System.out.println("过滤器初始化");
}
}
②在WebContent-->WEB-INF-->web.xml中,设置如下内容
web.xml文件:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
<display-name>MyBlog</display-name>
<filter>
<filter-name>Dofilter</filter-name>
<filter-class>filter.DoFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>Dofilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- 欢迎页,即进入项目的第一个界面 -->
<welcome-file-list>
<welcome-file>login.jsp</welcome-file>
</welcome-file-list>
</web-app>
三、EL与JSTL表达式
①先载入JSTL的Jar包,在项目右键BuildPath-->Configure Build Path的Libraries里-->Add Jars-->选择目标Jar包
②为确保载入Jar包成功,应该在WebContent-->WEB-INF-->lib的文件夹中查看是否有如下内容,这次用的便是有jstl前缀的jar包
③在WebContent-->新建一个jsp文件,取名为base.jsp-->写入如下内容
(关于layui、bootstrap等框架资源百度即可,按照目录结构放入其中)
base.jsp文件:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<c:set var="ctx" value="${pageContext.request.contextPath}"></c:set>
<link rel="stylesheet" href="${ctx }/js/layui/css/layui.css">
<script src="${ctx }/js/jquery-3.2.1.min.js"></script>
<script src="${ctx }/js/layui/layui.js"></script>
<script src="${ctx}/js/bootstrap/js/bootstrap.min.js"></script>
四、登录模块
①逻辑分析(以下为我画的管理员登录业务流程图)
②详细的数据库之前的博文已经写了,为了更好阅读这里再写一次
建数据库,命名为blog-->建表,命名为dai_adm,设计表的字段如下
属性名 |
类型 |
长度 |
允许空 |
是否主键 |
说明 |
adm_id |
tinyint |
4 |
NOT NULL |
主键 |
管理员id、自增 |
adm_name |
varchar |
20 |
NOT NULL |
|
管理员名称 |
adm_password |
varchar |
20 |
NOT NULL |
|
管理员密码 |
③既然是登录,自然要与数据库进行对接,这里我使用的是mysql数据库,要求要加载好mysql的jar包,步骤同之前JSTL的Jar包设置步骤
3.1 在Java Resources的src下-->新建package,命名为util-->新建一个config.properties文件,内容如下
(由于我mysql是接入3306端口,数据库连接时使用的用户名是root,没有设置密码,所以这么设置,如果你有密码,pwd=你的密码)
config.properties文件:
driverClass=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/blog?useUnicode=true&characterEncoding=utf-8&useSSL=false
#mysql username
user=root
#mysql password
pwd=
3.2 在Java Resources的src下-->util包中-->新建一个class文件,命名为DBUtil,代码如下
DBUtil.java文件:
package util;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;
public class DBUtil {
private static String driverClass;
private static String url;
private static String user;
private static String pwd;
//static block静态块
static{
//产生properties类的实例
Properties prop = new Properties();
//转换成文件流
InputStream is = DBUtil.class.getClassLoader().getResourceAsStream("util/config.properties");
try {
prop.load(is);
driverClass = prop.getProperty("driverClass").trim();
url = prop.getProperty("url").trim();
user = prop.getProperty("user").trim();
pwd = prop.getProperty("pwd").trim();
Class.forName(driverClass);
//当前类的位置
System.out.println(DBUtil.class.getResource(""));
//当前类的根目录的位置
System.out.println(DBUtil.class.getClassLoader().getResource(""));
} catch (Exception e) {
e.printStackTrace();
}
}
public static Connection getConnection(){
// 数据库的连接
Connection conn = null;
try {
conn = DriverManager.getConnection(url, user,pwd);
} catch (SQLException e) {
e.printStackTrace();
}
return conn;
}
public static void closeConnection(Connection conn) throws SQLException {
conn.close();
}
}
④这个项目使用了MVC结构,登录模块也就是对管理员进行操作,这里先写pojo层,再写dao层
4.1 在src中-->新建一个package,命名为pojo-->新建一个class文件,命名为Adm,内容如下
Adm.java文件:
package pojo;
public class Adm{
private Integer adm_id;
private String adm_name;
private String adm_password;
public Integer getAdm_id() {
return adm_id;
}
public void setAdm_id(Integer adm_id) {
this.adm_id = adm_id;
}
public String getAdm_name() {
return adm_name;
}
public void setAdm_name(String adm_name) {
this.adm_name = adm_name;
}
public String getAdm_passward() {
return adm_password;
}
public void setAdm_passward(String adm_password) {
this.adm_password = adm_password;
}
}
4.2 由于后来要做分页功能,所以还要封装一个类-->pojo包中-->新建一个class,命名为ChangePage,内容如下
ChangePage.java文件:
package pojo;
public class ChangePage {
private int page; //默认第一页
private int limit; //默认一页10条数据
private int startRow = (page-1)*limit;//mysql里语句随之发生改变
private String sort;//排序字段
private String order;//排序关键字
public int getPage() {
return page;
}
public void setPage(int page) {
this.page = page;
}
public int getLimit() {
return limit;
}
public void setLimit(int limit) {
this.limit = limit;
}
public int getStartRow() {
return (page-1)*limit;
}
public void setStartRow(int startRow) {
this.startRow = startRow;
}
public String getSort() {
return sort;
}
public void setSort(String sort) {
this.sort = sort;
}
public String getOrder() {
return order;
}
public void setOrder(String order) {
this.order = order;
}
}
4.3 在src中-->新建一个package,命名为dao-->新建一个interface文件,命名为AdmDao,内容如下
AdmDao.java文件:
package dao;
import java.util.ArrayList;
import pojo.Adm;
public interface AdmDao {
//1.查询管理员,返回一个管理员类型 这是login里头的方法
public Adm getAdm(String username,String password);
//2查询所有的管理员
public ArrayList<Adm> getAllAdm();
//3.添加管理员
public boolean insertAdm(String username,String pwd);
//4.根据id删除管理员
public boolean deleteAdm(int id);
//5.修改管理员信息
public boolean updateAdm(Adm a);
//6.根据adm_name查询是否存在该用户,即id唯一,用户名唯一
public boolean queryIsExist(String username);
//7.根据id,查询一个管理员
public Adm getOneAdm(int adm_id);
//8 分页查询所有的管理员
public ArrayList<Adm> getPageAdm(int page,int limit);
}
4.4 写AdmDao的实现类,本应该放在不同的包里,我当时为了简便,依然放在了dao包
dao包-->新建class文件,命名为AdmDaoImpl-->实现AdmDao接口,代码如下
AdmDaoImpl.java文件:
package dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import pojo.Adm;
import pojo.ChangePage;
import util.DBUtil;
public class AdmDaoImpl implements AdmDao {
// 分页方法
@Override
public ArrayList<Adm> getPageAdm(int page, int limit) {
ArrayList<Adm> adm = new ArrayList<Adm>();
Connection conn = DBUtil.getConnection();
ChangePage cp = new ChangePage();
cp.setLimit(limit);
cp.setPage(page);
int startRow = cp.getStartRow();
String sql = "select * from dai_adm limit " + startRow + "," + limit + "";
// 预编译
try {
PreparedStatement prep = conn.prepareStatement(sql);
ResultSet rst = prep.executeQuery();
while (rst.next()) {
Adm ad = new Adm();
ad.setAdm_id(rst.getInt(1));
ad.setAdm_name(rst.getString("adm_name"));
ad.setAdm_passward(rst.getString("adm_password"));
adm.add(ad);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
DBUtil.closeConnection(conn);
} catch (SQLException e) {
e.printStackTrace();
}
}
return adm;
}
// 查询所有的管理员
@Override
public ArrayList<Adm> getAllAdm() {
ArrayList<Adm> adm = new ArrayList<Adm>();
Connection conn = DBUtil.getConnection();
// 在数据库中添加记录
String sql = "select * from dai_adm";
// 预编译
try {
PreparedStatement prep = conn.prepareStatement(sql);
ResultSet rst = prep.executeQuery();
while (rst.next()) {
Adm ad = new Adm();
ad.setAdm_id(rst.getInt(1));
ad.setAdm_name(rst.getString("adm_name"));
ad.setAdm_passward(rst.getString("adm_password"));
adm.add(ad);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
DBUtil.closeConnection(conn);
} catch (SQLException e) {
e.printStackTrace();
}
}
return adm;
}
@Override
public Adm getAdm(String username, String password) {
Adm a = null;
Connection conn = DBUtil.getConnection();
String sql = "select * from dai_adm where adm_name = ? and adm_password = ?";
// 预编译
PreparedStatement prep;
try {
prep = conn.prepareStatement(sql);
prep.setString(1, username);
prep.setString(2, password);
ResultSet rst = prep.executeQuery();
if (rst.next()) {
System.out.println("啊啊啊,我是servlet,我已经查到信息了!!!");
a = new Adm();
a.setAdm_id(rst.getInt("adm_id"));
a.setAdm_name(rst.getString("adm_name"));
a.setAdm_passward(rst.getString("adm_password"));
return a;
} else {
// System.out.println(username+","+password);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
DBUtil.closeConnection(conn);
} catch (SQLException e) {
e.printStackTrace();
}
}
return a;
}
// 3.添加管理员
@Override
public boolean insertAdm(String username, String pwd) {
Connection conn = DBUtil.getConnection();
// 在数据库中添加记录
String sql = "insert into dai_adm(adm_name,adm_password) values(?,?)";
// 预编译
PreparedStatement prep;
try {
prep = conn.prepareStatement(sql);
prep.setString(1, username);
prep.setString(2, pwd);
prep.executeUpdate();
return true;
} catch (SQLException e) {
e.printStackTrace();
return false;
} finally {
try {
DBUtil.closeConnection(conn);
} catch (SQLException e) {
e.printStackTrace();
}
}
}
@Override
public boolean deleteAdm(int adm_id) {
Connection conn = DBUtil.getConnection();
// 在数据库中删除记录
String sql = "delete from dai_adm where adm_id = ?";
// 预编译
PreparedStatement prep;
try {
prep = conn.prepareStatement(sql);
prep.setInt(1, adm_id);
prep.executeUpdate();
return true;
} catch (SQLException e) {
e.printStackTrace();
return false;
} finally {
try {
DBUtil.closeConnection(conn);
} catch (SQLException e) {
e.printStackTrace();
}
}
}
@Override
public boolean updateAdm(Adm a) {
Connection conn = DBUtil.getConnection();
// 在数据库中修改记录
String sql = "update dai_adm set adm_name = ?,adm_password = ? where adm_id=?";
// 预编译
PreparedStatement prep;
try {
prep = conn.prepareStatement(sql);
prep.setString(1, a.getAdm_name());
prep.setString(2, a.getAdm_passward());
prep.setInt(3, a.getAdm_id());
prep.executeUpdate();
return true;
} catch (SQLException e) {
e.printStackTrace();
return false;
} finally {
try {
DBUtil.closeConnection(conn);
} catch (SQLException e) {
e.printStackTrace();
}
}
}
@Override
public boolean queryIsExist(String username) {
Connection conn = DBUtil.getConnection();
// 在数据库中查询记录
String sql = "select * from dai_adm where adm_name = ?";
// 预编译
PreparedStatement prep;
try {
prep = conn.prepareStatement(sql);
prep.setString(1, username);
ResultSet rst = prep.executeQuery();
if (rst.next()) {
return true;
} else {
return false;
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
DBUtil.closeConnection(conn);
} catch (SQLException e) {
e.printStackTrace();
}
}
return false;
}
@Override
public Adm getOneAdm(int adm_id) {
Adm a = null;
Connection conn = DBUtil.getConnection();
// 在数据库中修改记录
String sql = "select * from dai_adm where adm_id = ?";
// 预编译
PreparedStatement prep;
try {
prep = conn.prepareStatement(sql);
prep.setInt(1, adm_id);
ResultSet rst = prep.executeQuery();
a = new Adm();
if (rst.next()) {
a.setAdm_id(rst.getInt(1));
a.setAdm_name(rst.getString("adm_name"));
a.setAdm_passward(rst.getString("adm_password"));
return a;
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
DBUtil.closeConnection(conn);
} catch (SQLException e) {
e.printStackTrace();
}
}
return a;
}
}
PS:这里有一个方法叫做getAllAdm(),还有一个方法叫做getPageAdm()。
前者我是用来获得总共有多少条管理员信息,后者我是用来获得分页信息与分页数据的,前者本来不需要在数据库上走那么多步骤。
因为ResultSet创建的对象可以使用last()方法跳到最后一条数据,然后再使用getRow()方法获得总数,这里建议大家按照这种方法。
⑤Service层:src-->新建package包,命名为servlet-->新建一个Servlet文件,命名为LoginServlet-->在URL mappings中改名为/login-->键入代码,如下
LoginServlet.java文件:
package servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import dao.AdmDao;
import dao.AdmDaoImpl;
import pojo.Adm;
/**
* Servlet implementation class LoginServlet
WebServlet里的/login就是刚刚改的URL Mappings的内容
*/
@WebServlet("/login")
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public LoginServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
* void getSession()方法相当于得到一个session对象,而void setAttribute()和String Attribute分别是对属性赋值和得到属性值的方法。
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//response.getWriter().append("Served at: ").append(request.getContextPath());
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
String name = request.getParameter("username");
String pwd = request.getParameter("pwd");
AdmDao a = new AdmDaoImpl();
Adm adm = a.getAdm(name , pwd);
System.out.println(a.toString());
if(adm!=null) {
request.getSession().setAttribute("admin",adm);
//重定向到成功页面
response.sendRedirect("index.jsp");
}else {
//out.println("啊啊啊,我应该转发到失败的界面了");
request.setAttribute("errMsg", "账号或密码错误,请重新输入信息!");
//转发到login界面
request.getRequestDispatcher("login.jsp").forward(request, response);
return;
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
⑥WebContent-->新建jsp文件,命名为login.jsp-->键入代码,如下(使用了bootstrap和layui框架)
login.jsp文件:
<%@ 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">
<link rel="stylesheet" href="./js/bootstrap/css/bootstrap.min.css">
<link rel="stylesheet" href="./css/b_register.css">
<%@include file="base.jsp"%>
<title>登录</title>
</head>
<body>
<%
String errorMsg = (String) request.getAttribute("errMsg");
if (errorMsg == null) {
errorMsg = "";
}
%>
<div id="box">
<!-- action="${ctx}/login" -->
<form id="myform" method="post" action="${ctx}/login">
<div class="form-group">
<label for="username">用户名</label> <input type="text"
class="form-control" id="username" name="username"
placeholder="请输入用户名:"> <span id="tip"
style="color: red; margin-top: 20px;"><%=errorMsg%></span>
</div>
<div class="form-group">
<label for="pwd">密码</label> <input type="password"
class="form-control" id="pwd" name="pwd" placeholder="请输入密码:">
</div>
<button type="submit" class="btn btn-default btn_" id="btn">确定</button>
<span style="margin-left: 250px;"></span> <a href="register.jsp"><button
type="button" class="btn btn-default btn_">注册</button></a>
</form>
</div>
<script type="text/javascript">
layui.use([ 'layer' ], function() {
layui.use([ 'form' ], function() {
var form = layui.form;
});
// 点击提交执行的内容
$('#username').blur(function() {
//或者取长度
if ($("#username").val() == "") {
layer.msg("用户名不能输入为空哦!", {
icon : 2
});
return;
}
});
//点击提交,表单验证
$('#btn').click(function() {
if ($("#pwd").val() === "") {
layer.msg("密码不能输入为空哦!", {
icon : 2
});
return;
}
});
});
</script>
</body>
</html>
5.1 这里CSS目录如下(CSS并不重要,可以自己调整)
5.2 b_register的css样式如下
b_register.css文件:
@CHARSET "UTF-8";
*{
margin:0;
padding:0;
}
body{
background:url("./image/19.jpg") no-repeat;
}
#box{
width:520px;
height:400px;
margin:200px auto;
border-radius:20px;
background-color: rgba(0, 0, 0, 0.3);
box-shadow:1px 2px 5px black;
padding: 1px;
position:relative;
background-image: url(./image/18.gif);
opacity: 0.8;
}
#myform{
margin:30px;
}
span{
margin-left:100px;
}
.btn_{
color:tomato;
margin-top:30px;
}
5.3 base的css样式如下
base.css文件:
@charset "UTF-8";
body {
width: 100%;
height: 100%;
background: url('../css/image/18.gif');
overflow: hidden;
}
#box {
height:550px;
display:flex;
align-items:center;
justify-content:center;
align-content:center;
}
⑤当输入用户名或密码错误时,应该有的提示
⑥当输入密码正确时,应进入后台主界面,这里大家在WebContent里新建一个jsp文件,取名为index即可,这里放一张后台图,具体的下篇博文再更
五、注册模块
①逻辑分析(以下为我画的管理员注册业务流程图,注册成功即自动跳转登录页面)
②Service层:这里主要就是首先判断你是否输入用户名,用户名输入过后判断是否这个用户名已经存在(用户名和id都是唯一的),然后再验证你两次密码是否相同,最后再进入注册。
所以说前台可以判断1是是否输入2是密码两次是否一致;
后台连接数据库后应该是进行了两个操作1是判断用户名是否存在2是进行往数据库里增加数据
2.1 src-->在servlet包里-->新建一个Servlet文件,命名为RegisterServlet-->在URL mappings中改名为/register-->键入代码,如下
RegisterServlet.java文件:
package servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import dao.AdmDao;
import dao.AdmDaoImpl;
/**
* Servlet implementation class RegisterServlet
WebServlet里的/register就是刚刚改的URL Mappings的内容
*/
@WebServlet("/register")
public class RegisterServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public RegisterServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String result = "false";
PrintWriter writer = null;
try {
PrintWriter out = response.getWriter();
//1.接收参数
String username = request.getParameter("username");
String pwd = request.getParameter("pwd");
AdmDao a = new AdmDaoImpl();
boolean flag= a.insertAdm(username,pwd);
if(flag){
result = "true";
}
writer = response.getWriter();
writer.write(result);
}catch(Exception e) {
e.printStackTrace();
}finally {
writer.flush();
writer.close();
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
2.2 src-->在servlet包里-->新建一个Servlet文件,命名为QueryAdmIsExist-->在URL mappings中改名为/isExist-->键入代码,如下
QueryAdmIsExist.java文件:
package servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import dao.AdmDao;
import dao.AdmDaoImpl;
/**
* Servlet implementation class QueryAdmIsExist
*/
@WebServlet("/isExist")
public class QueryAdmIsExist extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public QueryAdmIsExist() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse resp) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
resp.setCharacterEncoding("utf-8");
resp.setContentType("text/html;charset=utf-8");
//根据姓名查询用户是否存在 改的更完善了一点
String result = "false";
PrintWriter writer = null;
try {
String username = request.getParameter("username");
AdmDao a = new AdmDaoImpl();
boolean flag = a.queryIsExist(username);
if(flag==true) {
result = "true";
}
writer = resp.getWriter();
writer.write(result);
} catch (Exception e) {
e.printStackTrace();
}finally {
writer.flush();
writer.close();
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
③在WebContent下-->新建jsp文件,命名为register.jsp-->键入代码,如下(这里使用的是ajax,和上面登录模块不一样,注意区别)
register.jsp文件:
<%@ 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">
<link rel="stylesheet" href="./js/bootstrap/css/bootstrap.min.css">
<link rel="stylesheet" href="./css/b_register.css">
<%@include file="base.jsp"%>
<title>注册</title>
</head>
<body>
<div id="box">
<form id="myform" method="post">
<div class="form-group">
<label for="username">用户名</label>
<input type="text" class="form-control" id="username" name="username" placeholder="请输入用户名:">
<span id="tip" style="color:red;margin-top:20px;"></span>
</div>
<div class="form-group">
<label for="pwd">密码</label>
<input type="password" class="form-control" id="pwd" name="pwd" placeholder="请输入密码:">
</div>
<div class="form-group">
<label for="conFirmPwd">确认密码</label>
<input type="password" class="form-control" id="conFirmPwd" name="conFirmPwd" placeholder="请再次输入密码:">
</div>
<button type="button" class="btn btn-default btn_" id = "btn">提交</button>
<span style="margin-left:250px;"></span>
<a href="login.jsp"><button type="button" class="btn btn-default btn_">返回</button></a>
</form>
</div>
</body>
<script>
layui.use([ 'layer' ], function() {
/* alert(0); */
layui.use([ 'form' ], function() {
var form = layui.form;
});
var isOk = false;
// 点击提交执行的内容
$('#username').blur(function() {
//或者取长度
if ($("#username").val() == "") {
layer.msg("不能输入为空哦!", {
icon : 2
});
return;
}else {
$.post('isExist',
{
username : $('#username').val()
},
function(result) {
//alert(typeof result);
if(result=="true"){
//alert(1);
isOk = false;
//利用jquery对元素设置样式
$('#username').css("border", "1px solid red");
//html() 设置标签之间的 内容
$('#tip').html('该用户已存在');
$('#tip').css("color", "red");
return;
}else{
//alert(2);
isOk = true;
//利用jquery对元素设置样式
$('#username').css("border", "1px solid gray");
//html() 设置标签之间的 内容
$('#tip').html('该用户名可用');
$('#tip').css("color", "green");
}
}, "text");
}
});
//点击提交,表单验证
$('#btn').click(function() {
if (!isOk) {
return;
}
if($("#pwd").val() !== $("#conFirmPwd").val()){
layer.msg("两次密码输入不同!",{
icon : 2
});
return;
}
//提交表单
$.post("register",//后台地址
{
username: $("#username").val(),
pwd:$("#pwd").val(),
},//需要提交到后台的数据
function(result){
//alert(typeof result);
//alert(result);
if (result) {
//添加成功
layer.msg("注册成功", {
icon : 1
});
window.location.href = "login.jsp";
}else{
layer.msg("注册失败",{
icon : 2
});
// 这里使用JQuery实现会有问题
document.getElementById("myform").reset();
$('#tip').html("");
}
},
"json");
//清空表单
});
});
</script>
</html>
④注册时用户名存在或可用的区别图片如下