基于SSM框架的简单登录注册

编程语言 2022-06-22 07:16:20 阅读次数: 0

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对于ssm框架，此处不再做多的说明，该项目运用了：IDEA+Maven+Mysql（8.0+）

因为我在写这个项目的时候，我做了多个不同的控制器获取前端页面返回数据的方式，所以这里说明一下，返回的方式：

1、直接把表单的参数写在Controller相应的方法的形参中（String UserName）；

2、通过HttpServletRequest接收，post方式和get方式都可以，

String username=request.getParameter(“username”)；

3、通过一个bean来接收,post方式和get方式都可以（User user）；

4、使用@ModelAttribute注解获取POST请求的FORM表单数据

（@ModelAttribute(“user”) User user）；

接下来进入项目：

一、项目结构

Controller层（控制器）、Dao（数据库访问层）、Pojo（User对象）、Service（业务层）

、resources （配置文件）

二、通过Maven仓库加载相关jar包

<dependencies>
        <!--Junit-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <!--数据库驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.27</version>
        </dependency>
        <!-- 数据库连接池 -->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>
        <!--Servlet - JSP -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <!--Mybatis-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.2</version>
        </dependency>
        <!--Spring-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <!--lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.20</version>
        </dependency>
    </dependencies>

三、编译实体类（Pojo）和数据库层（Dao）

在Pojo包中创建User类，注意，此处的setter和get，还有构造方法都通过jar包lombok里面的实现方法@Data、@AllArgsConstructor、@NoArgsConstructor省略了

package Pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {

    private int Id;
    private String UserName;
    private String PassWord;
}

在Dao包中创建UserDao接口和UserDao.xml配置文件，在UserDao.xml完成对数据库的操作

package Dao;

import Pojo.User;
import org.apache.ibatis.annotations.Param;

public interface UserDao {

    //登录
    User Login(@Param("UserName") String UserName,@Param("PassWord") String PassWord);

    //注册
    int Register(User user);
}
    

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="Dao.UserDao">

    <select id="Login" parameterType="String" resultType="User">
        select *
        from user.admin
        where UserName = #{UserName}
          and PassWord = #{PassWord}
    </select>

    <insert id="Register" parameterType="User">
        insert into user.admin(UserName, PassWord) value (#{UserName},#{PassWord})
    </insert>
</mapper>

配置Mybatis相关配置文件和Dao层

创建database.properties，配置相关的连接数据库内容

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/user?useSSL=true&useUnicode=true&characterEncoding=utf8&serverTimezone=UTC
jdbc.username=root
jdbc.password=011124

创建spring-dao.xml，连接数据库

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       https://www.springframework.org/schema/context/spring-context.xsd">

    <context:property-placeholder location="classpath:database.properties"/>

    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">

        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>

        <property name="maxPoolSize" value="30"/>
        <property name="minPoolSize" value="10"/>

        <property name="autoCommitOnClose" value="false"/>

        <property name="checkoutTimeout" value="10000"/>

        <property name="acquireRetryAttempts" value="2"/>

    </bean>

    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>

    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <property name="basePackage" value="Dao"/>
    </bean>
</beans>

创建mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

    <typeAliases>
        <package name="Pojo"/>
    </typeAliases>

    <mappers>
        <mapper class="Dao.UserDao"/>
    </mappers>
</configuration>

四、编译Service（业务层）

在Service包下，创建UserService接口，和UserServiceImpl实现类

package Service;

import Pojo.User;

public interface UserService {

    //登录
    User Login(String UserName,String PassWord);
    //注册
    int Register(User user);
}


package Service;

import Dao.UserDao;
import Pojo.User;

public class UserServiceImpl implements UserService {

    private UserDao userDao;

    public void setUserDao(UserDao userDao) {
        this.userDao = userDao;
    }


    @Override
    public User Login(String UserName, String PassWord) {
        User user = userDao.Login(UserName, PassWord);
        if (user != null && user.getUserName().equals(UserName) && user.getPassWord().equals(PassWord)) {
            return user;
        }
        return null;
    }

    @Override
    public int Register(User user) {
        return userDao.Register(user);
    }
}

创建spring-service.xml配置Service

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans.xsd
   http://www.springframework.org/schema/context
   http://www.springframework.org/schema/context/spring-context.xsd">

    <context:component-scan base-package="Service"/>

    <bean id="UserServiceImpl" class="Service.UserServiceImpl">
        <property name="userDao" ref="userDao"/>
    </bean>

    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>
</beans>

五、配置web.xml和SpringMVC

web.xml文件配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">

    <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:applicationContext.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <filter>
        <filter-name>encodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>utf-8</param-value>
        </init-param>
    </filter>

    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>
</web-app>

创建spring-mvc.xml配置SpringMVC，记得在WEB-INF下创建jsp文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans.xsd
   http://www.springframework.org/schema/context
   http://www.springframework.org/schema/context/spring-context.xsd
   http://www.springframework.org/schema/mvc
   https://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <mvc:annotation-driven/>
    <mvc:default-servlet-handler/>
    <context:component-scan base-package="Controller"/>

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

六、Controller（控制层）

package Controller;

import Pojo.User;
import Service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpServletRequest;

@Controller
@RequestMapping("/User")
public class UserController {

    @Autowired
    @Qualifier("UserServiceImpl")
    private UserService userService;

    @RequestMapping("/toLogin")
    public String toLogin() {
        return "Login";
    }

    @RequestMapping("/Login")
    public String Login(User user) {
        user = userService.Login(user.getUserName(), user.getPassWord());
        if (user != null) {
            return "success";
        }
        return "redirect:/User/toLogin";
    }

    @RequestMapping("/Login1")
    public String Login(String UserName, String PassWord) {
        User user = userService.Login(UserName, PassWord);
        if (user != null) {
            return "success";
        }
        return "redirect:/User/toLogin";
    }

    @RequestMapping("/Login2")
    public String Login(HttpServletRequest request) {
        String UserName = request.getParameter("UserName");
        String PassWord = request.getParameter("PassWord");
        User user = userService.Login(UserName, PassWord);
        if (user != null) {
            return "success";
        }
        return "redirect:/User/toLogin";
    }

    @RequestMapping("/toRegister")
    public String toRegister(User user){
        return "register";
    }

    @RequestMapping("/Register")
    public String Register(User user){
        System.out.println("用户名"+user.getUserName()+"密码"+user.getPassWord());
        userService.Register(user);
        return "redirect:/User/toLogin";
    }
}

七、前端页面

index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>$Title$</title>
</head>
<body>
<a href="${pageContext.request.contextPath}/User/toLogin">请先登录</a>
<a href="${pageContext.request.contextPath}/User/toRegister">注册</a>
</body>
</html>

Login.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/User/Login2">
    <table>
        <tr>
            <td>用户名</td>
            <td><input type="text" name="UserName"></td>
        </tr>
        <tr>
            <td>密码</td>
            <td><input type="text" name="PassWord"></td>
        </tr>
        <tr>
            <td colspan="2" align="center">
                <input type="submit" value="登录">
            </td>
        </tr>
    </table>
</form>
</body>
</html>

register.jsp

<%@ 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">
    <title>用户注册</title>
</head>
<body>
<form action="${pageContext.request.contextPath }/User/Register">
    <table>
        <tr>
            <td>用户名</td>
            <td><input type="text" name="UserName"></td>
        </tr>
        <tr>
            <td>密码</td>
            <td><input type="text" name="PassWord"></td>
        </tr>
        <tr>
            <td colspan="2" align="center">
                <input type="submit" value="注册">
            </td>
        </tr>
    </table>
</form>
</body>
</html>

success.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
登录成功！
</body>
</html>

运行截图

注意每个跳转的路径！！！！！！！！！！！！！！！！

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