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Spring Boot概述（二）

Studying_swz 2023-05-25 16:00:02

简介Spring Boot概述（二）

1.SpringBoot整合Junit

1.搭建SpringBoot工程

2.引入starter-test起步依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <scope>test</scope>
</dependency>

3.编写测试类

@Service
public class UserService {
    public void add(){
        System.out.println("add...");
    }
}

1. 添加测试相关注解 @SpringBootTest

编写测试方法

@SpringBootTest(classes = SpringbootTestApplication.class)
//这里加不加classes取决于当前测试类包所在的位置
//在引导类所在包的子包或同级则不需要加(会自动找引导类)，否则要加
class SpringbootRedisApplicationTests {

    @Autowired
    UserService userService;
    @Test
    void contextLoads() {
        userService.add();
    }
}

2.SpringBoot整合Redis

1.搭建SpringBoot工程

2.引入redis起步依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

配置redis相关属性

spring:
  redis:
    host: 127.0.0.1 #redis的主机ip
    port: 6379

1. 注入RedisTemplate模板

编写测试方法，测试（记得打开本机的redis）

@SpringBootTest
class SpringbootRedisApplicationTests {

    @Autowired
    private RedisTemplate redisTemplate;

    @Test
    public void testSet(){
        //存数剧
        redisTemplate.boundValueOps("name").set("zhangsan");
    }
    @Test 
    void testGet(){
        //获取数据
        Object name = redisTemplate.boundValueOps("name").get();
        System.out.println(name);
    }
}

3.SpringBoot整洁MyBatis

1.搭建SpringBoot工程

2.引入mybatis起步依赖，添加mysql驱动

<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.2.0</version>
</dependency>

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <scope>runtime</scope>
</dependency>

编写DataSource和MyBatis相关配置

DataSource配置信息：

spring:
  datasource:
    url: jdbc:mysql:///mzz
    username: root
    password: root
    driver-class-name: com.mysql.jdbc.Driver

用注解开发可以不用写MyBatis的配置

xml开发MyBatis相关配置：

mybatis:
  mapper-locations: classpath:mapper/*Mapper.xml #mapper映射文件路径
  type-aliases-package: com.itheima.springbootmybatis.domain #配置别名
#config-location: 指定mybatis的核心配置文件

4.定义表和实体类

USE `mzz`;

DROP TABLE IF EXISTS `t_user`;

CREATE TABLE `t_user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(32) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  `password` varchar(32) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

insert  into `t_user`(`id`,`username`,`password`) values (1,'zhangsan','123'),(2,'lisi','234');

在这里插入图片描述

@Data
@ToString
@AllArgsConstructor
@NoArgsConstructor
public class User {
    private Integer id;
    private String username;
    private String password;
}

编写dao和mapper文件/纯注解开发、
xml开发：

@Mapper
@Repository
public interface UserXmlMapper {

    public List<User> findAll();
}

<?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.itheima.springbootmybatis.mapper.UserXmlMapper">
    <select id="findAll" resultType="user">
        select * from t_user
    </select>
</mapper>

纯注解开发：


@Mapper
@Repository//这里可加可不加，mybatis提供@Mapper可以代替
public interface UserMapper {
    @Select("select * from t_user")
    public List<User> findAll();
}

6.测试

@SpringBootTest
class SpringbootMybatisApplicationTests {

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private UserXmlMapper userXmlMapper;

    @Test
    void testFindAll() {
        List<User> res = userMapper.findAll();
        for (User user : res) {
            System.out.println(user);
        }
    }

    @Test
    void testFindAll1() {
        List<User> res = userXmlMapper.findAll();
        for (User user : res) {
            System.out.println(user);
        }
    }
}