项目搭建：spring，springmvc，mybatis，maven

为了提供更具体的代码示例，我将为你概述一个基本的Spring + Spring MVC + MyBatis + Maven项目结构，并给出每个部分的一些关键配置和代码片段。请注意，以下例子是简化版，用于展示如何集成这些技术。

### 1. Maven `pom.xml` 文件

```xml
<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>springmvc-mybatis-maven</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>

<dependencies>

<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring.version}</version>
</dependency>

<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>${mybatis.version}</version>
</dependency>
<dependency>
<groupId>org.mybatis.spring</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.6</version>
</dependency>

<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.connector.version}</version>
</dependency>

<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
<scope>provided</scope>
</dependency>
</dependencies>

<build>
<finalName>springmvc-mybatis-maven</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
```

### 2. Spring配置文件 `applicationContext.xml`

```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:tx="http://www.springframework.org/schema/tx"
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/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">

<context:annotation-config/>
<context:component-scan base-package="com.example"/>

<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/mydb"/>
<property name="username" value="root"/>
<property name="password" value="password"/>
</bean>

<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<tx:annotation-driven transaction-manager="transactionManager"/>

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="mapperLocations" value="classpath:mapper/*.xml"/>
</bean>

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

</beans>
```

### 3. Spring MVC配置文件 `spring-mvc-config.xml`

```xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc"
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.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">

<mvc:annotation-driven/>

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

<mvc:resources mapping="/resources/**" location="/resources/"/>

<context:component-scan base-package="com.example.controller"/>
</beans>
```

### 4. Web应用配置 `web.xml`

```xml
<?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_3_1.xsd"
version="3.1">

<display-name>SpringMVC MyBatis Maven Example</display-name>

<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>

<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring-mvc-config.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
```

### 5. 创建一个简单的实体类 `User.java`

```java
package com.example.model;

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

// Getters and Setters
}
```

### 6. 创建Mapper接口 `UserMapper.java`

```java
package com.example.mapper;

import com.example.model.User;
import org.apache.ibatis.annotations.*;

import java.util.List;

@Mapper
public interface UserMapper {
@Select("SELECT * FROM users WHERE id = #{id}")
User findById(@Param("id") Integer id);

@Insert("INSERT INTO users(username, password) VALUES(#{username}, #{password})")
@Options(useGeneratedKeys = true, keyProperty = "id")
void insert(User user);

@Update("UPDATE users SET username=#{username}, password=#{password} WHERE id=#{id}")
void update(User user);

@Delete("DELETE FROM users WHERE id=#{id}")
void deleteById(@Param("id") Integer id);

@Select("SELECT * FROM users")
List<User> findAll();
}
```

### 7. 创建服务层 `UserService.java`

```java
package com.example.service;

import com.example.mapper.UserMapper;
import com.example.model.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
public class UserService {

@Autowired
private UserMapper userMapper;

@Transactional
public void saveOrUpdate(User user) {
if (user.getId() == null) {
userMapper.insert(user);
} else {
userMapper.update(user);
}
}

public void delete(Integer id) {
userMapper.deleteById(id);
}

public User findById(Integer id) {
return userMapper.findById(id);
}

public List<User> findAll() {
return userMapper.findAll();
}
}
```

### 8. 创建控制器 `UserController.java`

```java
package com.example.controller;

import com.example.model.User;
import com.example.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;

import java.util.List;

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

@Autowired
private UserService userService;

@GetMapping
public String listUsers(Model model) {
List<User> users = userService.findAll();
model.addAttribute("users", users);
return "userList"; // JSP page in /WEB-INF/views/userList.jsp
}

@GetMapping("/{id}")
public String viewUser(@PathVariable("id") Integer id, Model model) {
User user = userService.findById(id);
model.addAttribute("user", user);
return "userView"; // JSP page in /WEB-INF/views/userView.jsp
}

// Other CRUD actions...
}
```

### 9. 创建视图（JSP页面）

在`src/main/webapp/WEB-INF/views/`目录下创建相应的JSP页面来显示用户列表或单个用户详情等。

### 注意事项
- 上述代码示例中使用了`@Mapper`注解来标注MyBatis的Mapper接口，这需要确保你的`MapperScannerConfigurer`能够扫描到这个注解。
- 确保数据库表结构与映射一致，并且数据库连接信息正确无误。
- 根据实际情况调整包名、路径和其他细节。

这个例子是一个非常基础的搭建，实际项目可能会更复杂，包括更多的配置项、安全措施、日志记录、异常处理等内容。希望这个例子能帮助你开始构建自己的应用程序。

项目搭建：spring，springmvc，mybatis，maven

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