创建springboot项目--超级详细

创建springboot项目超级详细

application.properties

#配置端口
server.port=8080

#配置连接数据库
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/mysqldb
spring.datasource.username=root
spring.datasource.password=root

#指定mapper文件的位置
mybatis.mapper-locations=classpath:mapper/*.xml

#mybatis日志实现
mybatis.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl

StudentController

@Controller
public class StudentController {
    
    
    @Resource
    private StudentService studentService;
    @RequestMapping("/student/query")
    @ResponseBody
    public String queryStudent(Integer id){
    
    
        Student student = studentService.queryStudent(id);
        return student.toString();

    }
}

service

public interface StudentService {
    
    
    Student queryStudent(Integer id);
}

@Service
public class StudentServiceImpl implements StudentService {
    
    
    @Resource
    StudentDao studentDao = null;
    @Override
    public Student queryStudent(Integer id) {
    
    
        Student student = studentDao.selectById(id);
        return student;
    }
}

student

public class Student {
    
    
    private Integer id;
    private String name;
    private Integer age;

    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 Integer getAge() {
    
    
        return age;
    }

    public void setAge(Integer age) {
    
    
        this.age = age;
    }

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

StudentDao

@Mapper
public interface StudentDao {
    
    
    Student selectById(@Param("stuId") Integer id);
}

StudentDao.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.bj.dao.StudentDao">
    <select id="selectById" resultType="com.bj.model.Student">
        select id,name,age from student where id = #{stuId}
    </select>
</mapper>

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>3.0.1</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>_018-springboot-exer</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <properties>
        <java.version>17</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>3.0.0</version>
        </dependency>

        <dependency>
            <groupId>com.mysql</groupId>
            <artifactId>mysql-connector-j</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>

        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
    </build>

</project>

数据库