springboot学习笔记

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

将springboot项目打包后,在打包的文件夹下启动如下命令

 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

 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/> <!-- lookup parent from repository -->
	</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);
    }

}