Spring MVC用户注册和登录示例

本文是使用几种Web开发语言和数据库设置用户注册和登录的分步指南。

本文是使用以下工具和技术的用户注册和登录的分步指南。

Spring框架（Core，MVC和JBDC）

2. java 1.8

3.Maven 3.3.9

4. Eclipse IDE（Mars2）

5. MySQL 5.1

步骤1：创建Maven项目

使用Eclipse IDE，通过选择Web Archetype创建Maven项目。

步骤2：更新Pom.xml

更新你的maven依赖。

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">    <modelVersion>4.0.0</modelVersion>    <groupId>jbr</groupId>    <artifactId>SpringMvcUser</artifactId>    <packaging>war</packaging>    <version>0.1</version>    <name>SpringMvcUser Maven Webapp</name>    <url>http://maven.apache.org</url>    <properties>        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>        <spring.version>4.3.2.RELEASE</spring.version>        <junit.version>4.12</junit.version>        <servlet.version>3.1.0</servlet.version>        <servlet.version>3.0.1</servlet.version>        <mysql.connector.version>5.1.9</mysql.connector.version>    </properties>    <dependencies>        <!-- Junit -->        <dependency>            <groupId>junit</groupId>            <artifactId>junit</artifactId>            <version>${junit.version}</version>            <scope>test</scope>        </dependency>        <!--Servlet-Api -->        <dependency>            <groupId>javax.servlet</groupId>            <artifactId>javax.servlet-api</artifactId>            <version>${servlet.version}</version>        </dependency>        <!-- Spring Framework -->        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-core</artifactId>            <version>${spring.version}</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-beans</artifactId>            <version>${spring.version}</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-context</artifactId>            <version>${spring.version}</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-jdbc</artifactId>            <version>${spring.version}</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-test</artifactId>            <version>${spring.version}</version>            <scope>test</scope>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-webmvc</artifactId>            <version>${spring.version}</version>        </dependency>        <!-- Servlet API -->        <dependency>            <groupId>javax.servlet</groupId>            <artifactId>javax.servlet-api</artifactId>            <version>${servlet.version}</version>        </dependency>        <!-- MySQL database driver -->        <dependency>            <groupId>mysql</groupId>            <artifactId>mysql-connector-java</artifactId>            <version>${mysql.connector.version}</version>        </dependency>    </dependencies>    <build>        <finalName>SpringMvcUser</finalName>    </build></project>
步骤3：更新web.xml
更新src / main / webapp / WEB-INF下的web.xml，如下所示：
<?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>Archetype Created Web application</display-name>    <welcome-file-list>        <welcome-file>home.jsp</welcome-file>    </welcome-file-list>    <servlet>        <servlet-name>spring-mvc</servlet-name>        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>        <load-on-startup>1</load-on-startup>    </servlet>    <servlet-mapping>        <servlet-name>spring-mvc</servlet-name>        <url-pattern>/</url-pattern>    </servlet-mapping></web-app>
DispatcherServlet   是您的应用程序中定义的任何Servlet的根Servlet。 它将根据URL将对应用程序发出的请求重定向到相应的控制器。
spring-mvc   是根servlet的名称，Spring容器将查找具有此名称的配置。 所以下一步是使用spring-mvc-servlet.xml创建一个spring配置。
步骤4：创建spring-mvc-servlet.xml
创建spring-mvc-servlet.xml   在src / main / webapp / WEB-INF文件夹下，并定义bean。
<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation=" http://www.springframework.org/schema/beans  http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context  http://www.springframework.org/schema/context/spring-context-3.0.xsd">    <import resource="classpath:jbr/config/user-beans.xml" />    <context:component-scan base-package="jbr.springmvc" />    <context:annotation-config />    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">        <property name="prefix" value="/jsp/" />        <property name="suffix" value=".jsp" />    </bean></beans>
步骤5：创建控制器
为用户注册和登录创建单独的控制器，如下所示。
创建一个包jbr.springmvc.controller  
RegistrationController.java
package jbr.springmvc.controller;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.ModelAttribute;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.servlet.ModelAndView;import jbr.springmvc.model.User;import jbr.springmvc.service.UserService;@Controllerpublic class RegistrationController {  @Autowired  public UserService userService;  @RequestMapping(value = "/register", method = RequestMethod.GET)  public ModelAndView showRegister(HttpServletRequest request, HttpServletResponse response) {    ModelAndView mav = new ModelAndView("register");    mav.addObject("user", new User());    return mav;  }  @RequestMapping(value = "/registerProcess", method = RequestMethod.POST)  public ModelAndView addUser(HttpServletRequest request, HttpServletResponse response,  @ModelAttribute("user") User user) {  userService.register(user);  return new ModelAndView("welcome", "firstname", user.getFirstname());  }}
LoginController.java
package jbr.springmvc.controller;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.ModelAttribute;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.servlet.ModelAndView;import jbr.springmvc.model.Login;import jbr.springmvc.model.User;import jbr.springmvc.service.UserService;@Controllerpublic class LoginController {  @Autowired  UserService userService;  @RequestMapping(value = "/login", method = RequestMethod.GET)  public ModelAndView showLogin(HttpServletRequest request, HttpServletResponse response) {    ModelAndView mav = new ModelAndView("login");    mav.addObject("login", new Login());    return mav;  }  @RequestMapping(value = "/loginProcess", method = RequestMethod.POST)  public ModelAndView loginProcess(HttpServletRequest request, HttpServletResponse response,  @ModelAttribute("login") Login login) {    ModelAndView mav = null;    User user = userService.validateUser(login);    if (null != user) {    mav = new ModelAndView("welcome");    mav.addObject("firstname", user.getFirstname());    } else {    mav = new ModelAndView("login");    mav.addObject("message", "Username or PassWord is wrong!!");    }    return mav;  }}
步骤5：创建POJO类
创建一个包： jbr.springmvc.model  
Login.java
package jbr.springmvc.model;public class Login {  private String username;  private String password;  public String getUsername() {  return username;  }  public void setUsername(String username) {  this.username = username;  }  public String getPassword() {  return password;  }  public void setPassword(String password) {  this.password = password;  }}
User.java
package jbr.springmvc.model;public class User {  private String username;  private String password;  private String firstname;  private String lastname;  private String email;  private String address;  private int phone;  public String getUsername() {  return username;  }  public void setUsername(String username) {  this.username = username;  }  public String getPassword() {  return password;  }  public void setPassword(String password) {  this.password = password;  }  public String getFirstname() {  return firstname;  }  public void setFirstname(String firstname) {  this.firstname = firstname;  }  public String getLastname() {  return lastname;  }  public void setLastname(String lastname) {  this.lastname = lastname;  }  public String getEmail() {  return email;  }  public void setEmail(String email) {  this.email = email;  }  public String getAddress() {  return address;  }  public void setAddress(String address) {  this.address = address;  }  public int getPhone() {  return phone;  }  public void setPhone(int phone) {  this.phone = phone;  }}
注意：如果您想添加任何新的逻辑，您可以添加另一个称为服务的层并访问DAO层。
步骤6：创建DAO类
创建用于访问MySQL数据库的接口/类。
创建一个包： jbr.springmvc.dao  
UserDao.java
package jbr.springmvc.dao;import jbr.springmvc.model.Login;import jbr.springmvc.model.User;public interface UserDao {  void register(User user);  User validateUser(Login login);}
UserDaoImpl.java
package jbr.springmvc.dao;import java.sql.ResultSet;import java.sql.SQLException;import java.util.List;import javax.sql.DataSource;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.jdbc.core.JdbcTemplate;import org.springframework.jdbc.core.RowMapper;import jbr.springmvc.model.Login;import jbr.springmvc.model.User;public class UserDaoImpl implements UserDao {  @Autowired  DataSource datasource;  @Autowired  JdbcTemplate jdbcTemplate;  public void register(User user) {    String sql = "insert into users values(?,?,?,?,?,?,?)";    jdbcTemplate.update(sql, new Object[] { user.getUsername(), user.getPassword(), user.getFirstname(),    user.getLastname(), user.getEmail(), user.getAddress(), user.getPhone() });    }    public User validateUser(Login login) {    String sql = "select * from users where username='" + login.getUsername() + "' and password='" + login.getPassword()    + "'";    List<User> users = jdbcTemplate.query(sql, new UserMapper());    return users.size() > 0 ? users.get(0) : null;    }  }  class UserMapper implements RowMapper<User> {  public User mapRow(ResultSet rs, int arg1) throws SQLException {    User user = new User();    user.setUsername(rs.getString("username"));    user.setPassword(rs.getString("password"));    user.setFirstname(rs.getString("firstname"));    user.setLastname(rs.getString("lastname"));    user.setEmail(rs.getString("email"));    user.setAddress(rs.getString("address"));    user.setPhone(rs.getInt("phone"));    return user;  }}
步骤7：创建Spring Bean配置
在resources ，创建一个新的xml bean配置user-beans.xml 来定义我们创建的bean。
<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation=" http://www.springframework.org/schema/beans  http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context  http://www.springframework.org/schema/context/spring-context-3.0.xsd">    <context:component-scan base-package="jbr.springmvc" />    <context:annotation-config />    <bean id="userService" class="jbr.springmvc.service.UserServiceImpl" />    <bean id="userDao" class="jbr.springmvc.dao.UserDaoImpl" />    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">        <property name="dataSource" ref="datasource" />    </bean>    <bean id="datasource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">        <property name="driverClassName" value="com.mysql.jdbc.Driver" />        <property name="url" value="jdbc:mysql://localhost:3306/myusers" />        <property name="username" value="root" />        <property name="password" value="root" />    </bean></beans>
步骤8：在MySQL中创建表
CREATE DATABASE   IF NOT EXISTS myusers;USE     DROP TABLE     DROP TABLE IF EXISTS `myusers`.`users`;CREATE TABLE `myusers`.`users`                  (                               `username`  VARCHAR(45) NOT NULL,                               `password`  VARCHAR(45) NULL,                               `firstname` VARCHAR(45) NOT NULL,                               `lastname`  VARCHAR(45) NULL,                               `email`     VARCHAR(45) NULL,                               `address`   VARCHAR(45) NULL,                               `phone`     INT NULL,                               PRIMARY KEY (`username`)                  )
步骤9：创建视图
在/ src / main / webapp文件夹下，创建一个home.jsp，我们在web.xml中定义为“welcome-file”。
home.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1" %>    <!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=ISO-8859-1">        <title>Welcome</title>    </head>    <body>        <table align="center">            <tr>                <td><a href="login">Login</a>                </td>                <td><a href="register">Register</a>                </td>            </tr>        </table>    </body>    </html>
在/ src / main / webapp / jsp下创建：
register.jsp
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>    <%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1" %>        <html>        <head>            <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">            <title>Registration</title>        </head>        <body>            <form:form id="regForm" modelAttribute="user" action="registerProcess" method="post">                <table align="center">                    <tr>                        <td>                            <form:label path="username">Username</form:label>                        </td>                        <td>                            <form:input path="username" name="username" id="username" />                        </td>                    </tr>                    <tr>                        <td>                            <form:label path="password">Password</form:label>                        </td>                        <td>                            <form:password path="password" name="password" id="password" />                        </td>                    </tr>                    <tr>                        <td>                            <form:label path="firstname">FirstName</form:label>                        </td>                        <td>                            <form:input path="firstname" name="firstname" id="firstname" />                        </td>                    </tr>                    <tr>                        <td>                            <form:label path="lastname">LastName</form:label>                        </td>                        <td>                            <form:input path="lastname" name="lastname" id="lastname" />                        </td>                    </tr>                    <tr>                        <td>                            <form:label path="email">Email</form:label>                        </td>                        <td>                            <form:input path="email" name="email" id="email" />                        </td>                    </tr>                    <tr>                        <td>                            <form:label path="address">Address</form:label>                        </td>                        <td>                            <form:input path="address" name="address" id="address" />                        </td>                    </tr>                    <tr>                        <td>                            <form:label path="phone">Phone</form:label>                        </td>                        <td>                            <form:input path="phone" name="phone" id="phone" />                        </td>                    </tr>                    <tr>                        <td></td>                        <td>                            <form:button id="register" name="register">Register</form:button>                        </td>                    </tr>                    <tr></tr>                    <tr>                        <td></td>                        <td><a href="home.jsp">Home</a>                        </td>                    </tr>                </table>            </form:form>        </body>        </html>
login.jsp
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>    <%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1" %>        <!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=ISO-8859-1">            <title>Login</title>        </head>        <body>            <form:form id="loginForm" modelAttribute="login" action="loginProcess" method="post">                <table align="center">                    <tr>                        <td>                            <form:label path="username">Username: </form:label>                        </td>                        <td>                            <form:input path="username" name="username" id="username" />                        </td>                    </tr>                    <tr>                        <td>                            <form:label path="password">Password:</form:label>                        </td>                        <td>                            <form:password path="password" name="password" id="password" />                        </td>                    </tr>                    <tr>                        <td></td>                        <td align="left">                            <form:button id="login" name="login">Login</form:button>                        </td>                    </tr>                    <tr></tr>                    <tr>                        <td></td>                        <td><a href="home.jsp">Home</a>                        </td>                    </tr>                </table>            </form:form>            <table align="center">                <tr>                    <td style="font-style: italic; color: red;">${message}</td>                </tr>            </table>        </body>        </html>
welcome.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1" %>    <!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=ISO-8859-1">        <title>Welcome</title>    </head>    <body>        <table>            <tr>                <td>Welcome ${firstname}</td>            </tr>            <tr>            </tr>            <tr>            </tr>            <tr>                <td><a href="home.jsp">Home</a>                </td>            </tr>        </table>    </body>    </html>
步骤10：运行应用程序
右键单击应用程序，然后Maven-> clean。
右键单击应用程序，然后单击Maven-> install。
右键单击应用程序并运行As->在服务器上运行 - >使用Tomcat运行。
您将看到以下输出。
主页：
用户注册：
用户注册成功：
登录：
登录成功：
概要
本教程有助于为Spring MVC创建一个Maven项目，并为用户注册和登录开发一个小应用程序。