学黑马创建javaweb的springboot项目

其他多余的文件删除

用“新建java类”新建包和类（pojo.User）

pom.xml存放各种依赖

 根据数据库表写User实体类私有变量，右键生成getter和setter方法，在变量后面新建含参和无参构造函数，在最后生成tostring方法（摁着ctrl鼠标多选）

默认生成的application.properties文件用来写连接数据库配置文件

 然后创建mapper目录和UserMapper接口，用来放sql语句

 然后去项目自带的测试类进行测试

 

数据池换成德鲁伊
<dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-3-starter</artifactId> <version>1.2.24</version> </dependency>

实体类不想写那么多setter之类的方法可以这样，不过给先搞个依赖

<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>${lombok.version}</version>
    <scope>provided</scope> <!-- 显式指定作用域  -->
    <optional>true</optional>
</dependency>

 

 给pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.4.5</version>
        <relativePath/> <!-- 继承 Spring Boot 的默认配置  -->
    </parent>

    <groupId>com.itheima</groupId>
    <artifactId>springboot-mybatis</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot-mybatis</name>
    <description>Spring Boot + MyBatis + Druid 集成示例</description>

    <properties>
        <java.version>17</java.version>
        <!-- 显式指定关键依赖版本 -->
        <mysql.connector.version>8.0.33</mysql.connector.version>
        <druid.version>1.2.24</druid.version>
        <jakarta.servlet.version>6.0.0</jakarta.servlet.version>
        <lombok.version>1.18.32</lombok.version> <!-- 添加 Lombok 版本控制  -->
    </properties>

    <dependencies>
        <!-- Spring Boot Web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- MyBatis 集成 -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>3.0.3</version>
        </dependency>

        <!-- Druid 数据源（Spring Boot 3.x 适配版） -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-3-starter</artifactId>
            <version>${druid.version}</version> <!-- 统一版本声明  -->
        </dependency>

        <!-- MySQL 驱动 -->
        <dependency>
            <groupId>com.mysql</groupId>
            <artifactId>mysql-connector-j</artifactId>
            <version>${mysql.connector.version}</version>
            <scope>runtime</scope>
        </dependency>

        <!-- Jakarta Servlet API（Spring Boot 3.x 强制要求） -->
        <dependency>
            <groupId>jakarta.servlet</groupId>
            <artifactId>jakarta.servlet-api</artifactId>
            <version>${jakarta.servlet.version}</version>
            <scope>provided</scope> <!-- Jakarta EE 9+ 规范  -->
        </dependency>

        <!-- Lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>${lombok.version}</version>
            <scope>provided</scope> <!-- 显式指定作用域  -->
            <optional>true</optional>
        </dependency>

        <!-- 内嵌 Tomcat（默认作用域，无需 provided） -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
        </dependency>

        <!-- 参数校验支持 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
        </dependency>

        <!-- 测试依赖 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter-test</artifactId>
            <version>3.0.3</version> <!-- 与主依赖版本对齐 -->
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <!-- 添加 Maven 编译插件配置（支持 Lombok） -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                    <annotationProcessorPaths>
                        <path>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                            <version>${lombok.version}</version>
                        </path>
                    </annotationProcessorPaths>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>