spring-boot + mybatis 搭建

Posted 2021-01-30 youer66

 

spring boot + mybatis 环境搭建

• maven 项目的jar包引入

  <dependencies>
  
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
       <version>4.11</version>
       <scope>test</scope>
     </dependency>
  
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
  
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>
  
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-jdbc</artifactId>
    </dependency>
  
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>
  
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.2.2</version>
    </dependency>
  
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.2.8</version>
    </dependency>
  
    <dependency>
      <groupId>org.apache.tomcat</groupId>
      <artifactId>tomcat-jdbc</artifactId>
    </dependency>
  
    <dependency>
      <groupId>com.oracle</groupId>
      <artifactId>ojdbc6</artifactId>
      <version>11.2.0.1.0</version>
    </dependency>
  
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>1.1.43</version>
    </dependency>                                                                    
  </dependencies>

• 构造maven项目结构

• 

•   Java
        |_contrille 控制层
        |_mapper 存放DAO 运用的是mybatis所以存放的都是接口
        |_model 实体类
        |_services 业务层
        |_Application.java  是 springBoot 启动入口
    resources
        |_mybatis 存放mapper.xml 配置文件 ,主要的是读取这个文件过后创  建DAO的实现类
        |_templates 存放页面
        |_Application.properties 配置文件 数据库连接参数

• Application.java 入口类

    @EnableAutoConfiguration
  
    /*读取配置文件的路劲,在启动的时候自动加载该路径下的类到Spring容器中*/
    @SpringBootApplication
  
    @ComponentScan
    /*扫描 具有 Controller,services,repository注解的类到容器中*/
  
    @MapperScan("com.youer.shop.inventory.mapper")
    /*直接指定要扫描的mapper,这样在mapper接口上就不用一个个加@Mapper*/
  
    public class Application {
        @Bean
        @ConfigurationProperties(prefix="spring.datasource")
        /*加载配置信息,Application.porperties*/
        public DataSource dataSource() {
            return new org.apache.tomcat.jdbc.pool.DataSource();
        }
  
        @Bean
        /*数据连接*/
        public SqlSessionFactory sqlSessionFactoryBean() throws Exception {
            SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
            sqlSessionFactoryBean.setDataSource(dataSource());
            PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
     sqlSessionFactoryBean.setMapperLocations(resolver.getResources("classpath:/mybatis/*.xml"));
            return sqlSessionFactoryBean.getObject();
        }
  
        @Bean
        /*事务*/
        public PlatformTransactionManager transactionManager() {
            return new DataSourceTransactionManager(dataSource());
        }
  
        public static void main(String[] args) {
            SpringApplication.run(Application.class, args);
        }
    }    

• mapper.xml 的格式

      <?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.youer.shop.inventory.mapper.UserMapper">
  
        </mapper>

• 后续奖和redis整合 搭建一个分布式换成架构

    redis依赖
    <dependency>
         <groupId>redis.clients</groupId>
         <artifactId>jedis</artifactId>
    </dependency>