T系列项目讲解笔记1：后端依赖分析和pom.xml文件解析

├── src
│   ├── main
│   │   ├── java/cn/zwz/demo
│   │   │   ├── ZwzApplication.java
│   │   │   └── ...
│   │   └── resources
│   │       ├── application.yml
│   │       └── ...
│   └── test
│       ├── java/cn/zwz/demo
│       │   └── ...
│       └── resources
└── pom.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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
 
    <groupId>com.example</groupId>
    <artifactId>my-project</artifactId>
    <version>1.0-SNAPSHOT</version>
 
    <properties>
        <!-- 定义项目属性 -->
    </properties>
 
    <dependencies>
        <!-- 项目依赖 -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
 
    <build>
        <!-- 构建配置 -->
    </build>
 
    <repositories>
        <!-- 仓库配置 -->
    </repositories>
 
    <pluginRepositories>
        <!-- 插件仓库配置 -->
    </pluginRepositories>
 
    <distributionManagement>
        <!-- 部署配置 -->
    </distributionManagement>
 
    <reporting>
        <!-- 报告配置 -->
    </reporting>
 
</project>

@SpringBootApplication
@MapperScan(basePackages = {"com.dao"})
public class SpringbootSchemaApplication extends SpringBootServletInitializer{

	public static void main(String[] args) {
		SpringApplication.run(SpringbootSchemaApplication.class, args);
	}
}

<mapper namespace="com.example.mapper.UserMapper">
  <!-- 查询用户 -->
  <select id="selectUser" parameterType="int" resultType="com.example.entity.User">
    SELECT id, username, email
    FROM users
    WHERE id = #{id}
  </select>
</mapper>

public class demo1 {
    /*
      1. 导入mysql驱动包
      2. 注册驱动
      3. 建立与mysql的连接驱动
      4. 向mysql发送sql语句
      5. 接收返回效果
      6. 关闭连接通道
     */
    public static void main(String[] args) {
        try {
            // 初始化驱动程序，这样就可以打开与数据库的通信信道
            Class.forName("com.mysql.cj.jdbc.Driver"); //以java反射机制来创建此类对象
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        //characterEncoding=utf8编码设置，连接mysql8 必须设置时区Timezone=Asia/Shanghai
        String url = "jdbc:mysql://127.0.0.1:3306/t001?characterEncoding=utf8&useSSL=false&serverTimezone=Asia/Shanghai";
        try {
            //Connection接口  实际返回的mysql的实现类对象
            Connection connection =  DriverManager.getConnection(url,"root","123456");
            //Statement 对象 发送sql
            Statement statement = connection.createStatement();
            //statement.executeUpdate(); statement.executeQuery();
            statement.executeUpdate("insert into major(mname)values('网络')");
            //statement.executeQuery();
            statement.close();
            connection.close();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
    }

spring:
    datasource:
        driverClassName: com.mysql.cj.jdbc.Driver
        url: jdbc:mysql://127.0.0.1:3306/t101?useUnicode=true&characterEncoding=utf-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=GMT%2B8
        username: root
        password: 123456

@Override
public PageUtils queryPage(Map<String, Object> params, Wrapper<XueshengEntity> wrapper) {
	  Page<XueshengView> page =new Query<XueshengView>(params).getPage();
		page.setRecords(baseMapper.selectListView(page,wrapper));
		PageUtils pageUtil = new PageUtils(page);
		return pageUtil;
}

@Override
public List<XueshengVO> selectListVO(Wrapper<XueshengEntity> wrapper) {
	return baseMapper.selectListVO(wrapper);
}

@Override
public XueshengVO selectVO(Wrapper<XueshengEntity> wrapper) {
	return baseMapper.selectVO(wrapper);
}

@Override
public List<XueshengView> selectListView(Wrapper<XueshengEntity> wrapper) {
	return baseMapper.selectListView(wrapper);
}

@Override
public XueshengView selectView(Wrapper<XueshengEntity> wrapper) {
	return baseMapper.selectView(wrapper);
}

import java.text.SimpleDateFormat;
import java.util.Date;
 
public class SimpleDateFormatExample {
    public static void main(String[] args) {
        // 创建一个SimpleDateFormat对象，定义格式
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm");
        
        // 获取当前日期时间
        Date now = new Date();
        
        // 使用format方法格式化日期时间
        String formattedDate = sdf.format(now);
        
        // 打印格式化后的日期时间
        System.out.println(formattedDate);
    }
}

String str = DateUtils.now();

{
  "name": "John Doe",
  "age": 30,
  "isEmployed": true,
  "address": {
    "street": "123 Main St",
    "city": "Anytown",
    "zipCode": "12345"
  },
  "phoneNumbers": ["123-456-7890", "987-654-3210"]
}

{
  "database": {
    "host": "localhost",
    "port": 3306,
    "username": "user",
    "password": "password"
  },
  "server": {
    "port": 8080,
    "logLevel": "debug"
  }
}