用ssm设计一个网上商城

好的，下面我将为你介绍如何使用SSM框架来设计一个网上商城。

1. 环境准备

首先需要准备好相应环境：

- JDK 1.8+
- Maven 3.0+
- MySQL 5.6+
- Tomcat 8.0+

2. 创建Maven项目

使用Maven创建一个基于SSM框架的Java Web项目。在pom.xml文件中添加相关依赖：

<!-- Spring -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>5.1.9.RELEASE</version>
</dependency>

<!-- SpringMVC -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>5.1.9.RELEASE</version>
</dependency>

<!-- MyBatis -->
<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis</artifactId>
    <version>3.5.6</version>
</dependency>

<!-- MySQL 连接驱动 -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.47</version>
</dependency>

<!-- JSTL -->
<dependency>
    <groupId>jstl</groupId>
    <artifactId>jstl</artifactId>
    <version>1.2</version>
</dependency>

<!-- Servlet API -->
<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>servlet-api</artifactId>
    <version>2.5</version>
    <scope>provided</scope>
</dependency>

<!-- Junit -->
<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.12</version>
    <scope>test</scope>
</dependency>

3. 配置Spring

在src/main/resources下创建spring-config.xml文件，并添加Spring的配置信息：

<!-- 数据库配置 -->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
      init-method="init" destroy-method="close">
    <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
    <property name="url" value="jdbc:mysql://localhost:3306/mall?useUnicode=true&amp;characterEncoding=utf-8"/>
    <property name="username" value="root"/>
    <property name="password" value="root"/>
    <property name="initialSize" value="5"/>
    <property name="maxActive" value="20"/>
    <property name="minIdle" value="1"/>
    <property name="maxWait" value="60000"/>
    <property name="timeBetweenEvictionRunsMillis" value="60000"/>
    <property name="minEvictableIdleTimeMillis" value="300000"/>
    <property name="validationQuery" value="SELECT 'x'"/>
    <property name="testWhileIdle" value="true"/>
    <property name="testOnBorrow" value="false"/>
    <property name="testOnReturn" value="false"/>
    <property name="poolPreparedStatements" value="true"/>
    <property name="maxPoolPreparedStatementPerConnectionSize" value="20"/>
    <property name="filters" value="stat"/>
</bean>

<!-- MyBatis配置 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <property name="typeAliasesPackage" value="com.example.mall.pojo"/>
</bean>

<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <property name="basePackage" value="com.example.mall.dao"/>
</bean>

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

<!-- 开启Spring注解 -->
<context:annotation-config/>

<!-- Spring扫描注解 -->
<context:component-scan base-package="com.example.mall"/>

4. 配置SpringMVC

在src/main/resources下创建spring-mvc.xml文件，并添加SpringMVC的配置信息：

<!-- 静态资源映射 -->
<mvc:resources mapping="/css/**" location="/WEB-INF/static/css/"/>
<mvc:resources mapping="/js/**" location="/WEB-INF/static/js/"/>
<mvc:resources mapping="/images/**" location="/WEB-INF/static/images/"/>

<!-- 视图解析器 -->
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
    <property name="prefix" value="/WEB-INF/views/"/>
    <property name="suffix" value=".jsp"/>
</bean>

<!-- 开启SpringMVC注解 -->
<mvc:annotation-driven/>

<!-- SpringMVC扫描注解 -->
<context:component-scan base-package="com.example.mall.controller"/>

5. 配置Web.xml

在Web.xml中添加DispatcherServlet的配置信息：

<!-- 配置DispatcherServlet -->
<servlet>
    <servlet-name>mall</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring-mvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>mall</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

<!-- 配置字符编码过滤器 -->
<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>

6. 编写Controller

在com.example.mall.controller包下创建UserController.java文件，并添加用户相关的Controller代码：

@Controller
@RequestMapping("/user")
public class UserController {
    
    @Autowired
    private UserService userService;
    
    @RequestMapping("/list")
    public String list(Model model) {
        List<User> userList = userService.getUserList();
        model.addAttribute("userList", userList);
        return "user/list";
    }
    
    @RequestMapping("/add")
    public String add(User user) {
        userService.addUser(user);
        return "redirect:/user/list";
    }
    
    @RequestMapping("/delete")
    public String delete(Integer id) {
        userService.deleteUser(id);
        return "redirect:/user/list";
    }
    
    @RequestMapping("/update")
    public String update(User user) {
        userService.updateUser(user);
        return "redirect:/user/list";
    }
    
    @RequestMapping("/get")
    public String get(Integer id, Model model) {
        User user = userService.getUserById(id);
        model.addAttribute("user", user);
        return "user/edit";
    }
}

7. 编写Service

在com.example.mall.service包下创建UserService.java文件，并添加用户相关的Service代码：

@Service
public class UserService {
    
    @Autowired
    private UserDao userDao;
    
    public List<User> getUserList() {
        return userDao.getUserList();
    }
    
    public void addUser(User user) {
        userDao.addUser(user);
    }
    
    public void deleteUser(Integer id) {
        userDao.deleteUser(id);
    }
    
    public void updateUser(User user) {
        userDao.updateUser(user);
    }
    
    public User getUserById(Integer id) {
        return userDao.getUserById(id);
    }
}

8. 编写Dao

在com.example.mall.dao包下创建UserDao.java文件，并添加用户相关的Dao代码：

@Repository
public interface UserDao {

    List<User> getUserList();
    
    void addUser(User user);
    
    void deleteUser(Integer id);
    
    void updateUser(User user);
    
    User getUserById(Integer id);
}

9. 编写JSP

在WEB-INF/views/user下创建list.jsp、add.jsp和edit.jsp文件，分别用于显示用户列表、添加用户和修改用户信息。

10. 运行项目

在Tomcat中部署项目并启动Tomcat服务器，在浏览器中访问http://localhost:8080/user/list即可查看用户列表。