面试—机试：用SSM写出简单登录注册+增删改查（jsp,controller层，service层，dao层，配置，依赖）

其他 2020-10-18 16:28:31 阅读次数: 0

框架：Spring+SpringMVC+Mybatis
数据源：druid
数据库：mysql

用SSM写出简单登录注册+增删改查（jsp,controller层，service层，dao层，配置，依赖）

实体类

public class User {
    
    
    private Integer id;
    private String name;
    private String password;

    public User() {
    
    
    }

    public User(Integer id, String name, String password) {
    
    
        this.id = id;
        this.name = name;
        this.password = password;
    }

    public Integer getId() {
    
    
        return id;
    }

    public void setId(Integer id) {
    
    
        this.id = id;
    }

    public String getName() {
    
    
        return name;
    }

    public void setName(String name) {
    
    
        this.name = name;
    }

    public String getPassword() {
    
    
        return password;
    }

    public void setPassword(String password) {
    
    
        this.password = password;
    }

    @Override
    public String toString() {
    
    
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

dao层

接口

public interface UserDao {
    
    
    //增
    void insertUser(User user);
    //删
    void deleteUser(int id);
    //改
    void updateUser(User user);
    //查
    List<User> selectUser();
    //根据用户名和密码查询
    User selectUserByNameAndPassword(User user);
}

UserMapper.xml

<?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="com.yn.dao.UserDao">  <!--要实现dao接口的全限定名-->

    <!--增-->               <!--keyProperty是Java对象的属性名,useGeneratedKeys="true":设置是否使用JDBC的getGenereatedKeys方法获取主键并赋值到keyProperty-->
    <insert id="insertUser" keyProperty="id" useGeneratedKeys="true">    <!--向表中插入自增ID-->
        INSERT INTO USER (NAME,PASSWORD) VALUES (#{
    
    name},#{
    
    password})
    </insert>

    <!--删-->
    <delete id="deleteUser">
        DELETE FROM USER WHERE id=#{
    
    id}
    </delete>

    <!--改-->
    <update id="updateUser">
        update USER
        <set>
            <if test="name != null and name != ''">
                NAME = #{
    
    name},
            </if>
            <if test="password != null and password != ''">
                PASSWORD = #{
    
    password},
            </if>
        </set>
        WHERE id = #{
    
    id}
    </update>

    <!--查-->
    <select id="selectUser" resultType="User">
        SELECT NAME,PASSWORD FROM USER LIMIT 0, 1000
    </select>

    <!--根据用户名和密码查询-->
    <select id="selectUserByNameAndPassword" resultType="User">
        SELECT NAME,PASSWORD FROM USER WHERE NAME = #{
    
    name} AND PASSWORD = #{
    
    password}
    </select>

</mapper>

service层

接口

public interface UserService {
    
    
    //增
    void insertUser(User user);
    //删
    void deleteUser(int id);
    //改
    void updateUser(User user);
    //查
    List<User> selectUser();
    //根据用户名和密码查询
    User selectUserByNameAndPassword(User user);
}

UserServiceImpl

@Service
public class UserServiceImpl implements UserService {
    
    
    @Autowired
    private UserDao userDao;

    @Override
    public void insertUser(User user) {
    
    
        userDao.insertUser(user);
    }

    @Override
    public void deleteUser(int id) {
    
    
        userDao.deleteUser(id);
    }

    @Override
    public void updateUser(User user) {
    
    
        userDao.updateUser(user);
    }

    @Override
    public List<User> selectUser() {
    
    
        List<User> users = userDao.selectUser();
        return users;
    }

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

controller层

@Controller
@RequestMapping("/user")
public class UserController {
    
    
    @Autowired
    private UserService userService;

    //登录
    @RequestMapping("/login")
    public String login(User user) {
    
    
        //逻辑判断   非空，非法字符，长度，重名等...
        User user1 = userService.selectUserByNameAndPassword(user);
        return "首页";
    }

    //注册
    @RequestMapping("/register")
    public String register(User user) {
    
    
        //逻辑判断   注册规则，非空，非法字符，长度，重名等...
        System.out.println("注册");
        userService.insertUser(user);
        return "注册成功页面";
    }

    //增
    @RequestMapping("/insertUser")
    public void insertUser(User user) {
    
    
        userService.insertUser(user);
    }

    //删
    @RequestMapping("/deleteUser")
    public void deleteUser(int id) {
    
    
        userService.deleteUser(id);
    }

    @RequestMapping("/updateUser")
    public void updateUser(User user) {
    
    
        userService.updateUser(user);
    }

    //查
    @RequestMapping("/selectUser")
    @ResponseBody
    public List<User> selectUser() {
    
    
        List<User> users = userService.selectUser();
        return users;
    }
}

配置

spring.xml

<?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:cotext="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
       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 http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
    <!--组件扫描-->
    <cotext:component-scan base-package="com.yn">
        <!-- 排除Controller注解 避免父子容器污染-->
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </cotext:component-scan>

    <!--创建数据源-->
    <cotext:property-placeholder location="classpath:mysql.properties"></cotext:property-placeholder>
    <bean class="com.alibaba.druid.pool.DruidDataSource" id="dataSource">
        <property name="driverClassName" value="${driver}"></property>
        <property name="url" value="${url}"></property>
        <property name="username" value="${name}"></property>
        <property name="password" value="${password}"></property>
    </bean>

    <!--管理sqlsessionfactory-->
    <bean class="org.mybatis.spring.SqlSessionFactoryBean" id="sqlSessionFactory">
        <!--数据源-->
        <property name="dataSource" ref="dataSource"></property>
        <!--mapper-->
        <property name="mapperLocations" value="classpath:com/yn/mapper/*Mapper.xml"></property>
        <!--实体列别名-->
        <property name="typeAliasesPackage" value="com.yn.entity"></property>
    </bean>

    <!--dao扫描-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
        <property name="basePackage" value="com.yn.dao"></property>
    </bean>

    <!--事务管理-->
    <bean class="org.springframework.jdbc.datasource.DataSourceTransactionManager" id="transactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!--事务注解驱动-->
    <tx:annotation-driven transaction-manager="transactionManager"></tx:annotation-driven>

</beans>

mysql.properties（mysql配置文件）

driver=com.mysql.cj.jdbc.Driver
url=jdbc:mysql://localhost:3306/test
name=root
password=root

springmvc.xml

<?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 https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <!-- 扫描controller (关闭默认的规则)-->
    <context:component-scan base-package="com.yn" use-default-filters="false">
        <!-- 只扫描Conreoller 避免父子容器污染-->
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

    <!--处理器映射器、处理器适配器-->
    <mvc:annotation-driven></mvc:annotation-driven>
    <!--视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>

    <mvc:default-servlet-handler/>

</beans>

web.xml

<!-- 指定spring配置文件的路径 -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:spring.xml</param-value>
  </context-param>

  <!-- 设置编码格式 -->
  <filter>
    <filter-name>character</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>
    <init-param>
      <param-name>foreEncoding</param-name>
      <param-value>true</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>character</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <!--项目启动监听器-->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

  <servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <!-- 指定springmvc配置文件的路径 -->
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc.xml</param-value>
    </init-param>
  </servlet>
  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

依赖

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>

    <!-- spring相关(context aspects jdbc tx webmvc test  servlet-api jstl)  -->
    <!-- spring   context aspects jdbc tx test webmvc -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>4.3.26.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aspects</artifactId>
      <version>4.3.26.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>4.3.26.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>4.3.26.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>4.3.26.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>4.3.26.RELEASE</version>
    </dependency>
    <!-- servlet-api  jstl -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>servlet-api</artifactId>
      <version>2.5</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>


    <!-- mybatis mybatis-spring mysql  -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.3.2</version>
    </dependency>
    <!-- mybatis -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.4.6</version>
    </dependency>
    <!-- mysql -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.18</version>
    </dependency>
    <!-- 阿里连接池 -->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.1.10</version>
    </dependency>

jsp页面

login.jsp

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@page contentType="text/html; utf-8" isELIgnored="false" pageEncoding="utf-8" %>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<c:set var="path" value="${pageContext.request.contextPath}"/>
<html>
    <head>
        <title>login</title>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <!-- jquery.js -->
        <script src="jquery.min.js"></script>
    </head>

    <body>
        <div id="content">
            <form action="${path}/user/login" method="post">
                <table>
                    <tr>
                        <td valign="middle" align="right">
                            用户名:
                        </td>
                        <td valign="middle" align="left">
                            <input type="text" class="inputgri" name="name" />
                        </td>
                    </tr>
                    <tr>
                        <td valign="middle" align="right">
                            密码:
                        </td>
                        <td valign="middle" align="left">
                            <input type="password" class="inputgri" name="password" />
                        </td>
                    </tr>
                </table>
                <p>
                    <input type="submit" class="button" value="登录" />
                    <input type="button" class="button" value="注册" />
                </p>
            </form>
        </div>
    </body>
</html>

register.jsp

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@page contentType="text/html; utf-8" isELIgnored="false" pageEncoding="utf-8" %>
<html>
	<head>
		<title>regist</title>
		<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
		<!-- jquery.js -->
		<script src="jquery.min.js"></script>
	</head>

	<body>
	<div id="content">
		<form action="${pageContext.request.contextPath}/user/register" method="post">
			<table>
				<tr>
					<td valign="middle" align="right">
						用户名:
					</td>
					<td valign="middle" align="left">
						<input type="text" class="inputgri" name="name" />
					</td>
				</tr>
				<tr>
					<td valign="middle" align="right">
						密码:
					</td>
					<td valign="middle" align="left">
						<input type="password" class="inputgri" name="password" />
					</td>
				</tr>
			</table>
			<p>
				<input type="submit"  value="注册" />
			</p>
		</form>
	</div>
	</body>
</html>

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