springboot学习笔记

忘是亡心i 2024-04-06 13:14 62阅读 0赞

1.数组的创建要注意,在 - 后要有个空格

2.在yml文件的对象" : "后面要加上空格

3.取值方式

@Value("${name}")

@Value("${address[0]}")

4.值包括在''中则不转义字符,包裹在""中则转义字符

5.在pom.xml中添加如下依赖

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-configuration-processor</artifactId>
        <optional>true</optional>
    </dependency>

这样在书写application.yml的时候可以按照属性提示,比如person.address等等

6.springboot项目打包成jar包

![04f5d717ea65489cac8e57b0e1b1b613.png][]

![3fe3fb428bf44ece8fb92b87d06b1794.png][]

将springboot项目打包后,在打包的文件夹下启动如下命令

![2463bb82c54040169c2abec54d326143.png][]

如果要切换到测试环境则:即在上一句的后面添加spring.properties.active=prod,同时观察到图中端口号已经切换为8087

![965ebf5c08c044a19fd9e7b8e476c37c.png][]

7.整合junit

package com.example.junitstudy;
    
    import com.example.service.UserService;
    import org.junit.jupiter.api.Test;
    import org.junit.runner.RunWith;
    import org.springframework.boot.test.context.SpringBootTest;
    import org.springframework.test.context.junit4.SpringRunner;
    
    @RunWith(SpringRunner.class)//junit框架整合过来
    @SpringBootTest(classes = JunitStudyApplication.class)//将要测试的类导入
    class JunitStudyApplicationTests {
        UserService userService = new UserService();
        @Test
        void contextLoads() {
            userService.add();
        }
    }

8.springboot整合mybatis

在pom中添加如下依赖:

<?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>2.7.4</version>
    		<relativePath/> 
    	</parent>
    	<groupId>com.ydl</groupId>
    	<artifactId>springboot-mybatis</artifactId>
    	<version>0.0.1-SNAPSHOT</version>
    	<name>springboot-mybatis</name>
    	<description>springboot-mybatis</description>
    	<properties>
    		<java.version>17</java.version>
    	</properties>
    	<dependencies>
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-web</artifactId>
    		</dependency>
    
    		<dependency>
    			<groupId>org.projectlombok</groupId>
    			<artifactId>lombok</artifactId>
    			<optional>true</optional>
    		</dependency>
    		<dependency>
    			<groupId>org.mybatis.spring.boot</groupId>
    			<artifactId>mybatis-spring-boot-starter</artifactId>
    			<version>1.3.1</version>
    		</dependency>
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
            </dependency>
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-test</artifactId>
    			<scope>test</scope>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-test</artifactId>
    			<scope>test</scope>
    		</dependency>
    		<dependency>
    			<groupId>junit</groupId>
    			<artifactId>junit</artifactId>
    			<scope>test</scope>
    		</dependency>
    	</dependencies>
    
    	<build>
    		<plugins>
    			<plugin>
    				<groupId>org.springframework.boot</groupId>
    				<artifactId>spring-boot-maven-plugin</artifactId>
    				<configuration>
    					<excludes>
    						<exclude>
    							<groupId>org.projectlombok</groupId>
    							<artifactId>lombok</artifactId>
    						</exclude>
    					</excludes>
    				</configuration>
    			</plugin>
    		</plugins>
    	</build>
    
    </project>

然后建立实体类

@Data
    @AllArgsConstructor
    @NoArgsConstructor
    public class User {
        private int id;
        private String user_name;
        private String password;
    }

建立mapper类(查询语句)

@Mapper
    public interface UserMapper {
        @Select("select * from user")
        public List<User> findAll();
    }

在测试类里配置一下

package com.ydl.springbootmybatis;
    
    import com.ydl.springbootmybatis.mapper.UserMapper;
    import com.ydl.springbootmybatis.user.User;
    import org.junit.jupiter.api.Test;
    import org.junit.runner.RunWith;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.boot.test.context.SpringBootTest;
    import org.springframework.test.context.junit4.SpringRunner;
    
    import java.util.List;
    
    @SpringBootTest(classes = SpringbootMybatisApplication.class)
    @RunWith(SpringRunner.class)
    class SpringbootMybatisApplicationTests {
        @Autowired
        UserMapper userMapper;
    
        @Test
        void contextLoads() {
            List<User> all = userMapper.findAll();
            System.out.println(all);
        }
    
    }

[04f5d717ea65489cac8e57b0e1b1b613.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/06/b93e8439ca8243b981e13a1f5a5c37ad.png
[3fe3fb428bf44ece8fb92b87d06b1794.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/06/a10630cb17af4cf7b0851b07bcc5cf44.png
[2463bb82c54040169c2abec54d326143.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/06/d1db96c678524f98b318a9720020ae51.png
[965ebf5c08c044a19fd9e7b8e476c37c.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/06/f915d43c1c034df18a5cbf29a0ba02a2.png