Spring整合其他技术

文章目录

Spring整合mybatis
- 思路分析
- - Mybatis程序核心对象分析
  - 整合Mybatis
- 代码实现
Spring整合Junit
修改成警告

Spring整合mybatis

思路分析

Mybatis程序核心对象分析

上面图片是mybatis的代码，上述有三个对象，分别是sqlSessionFactory，sqlSession，accountDao这三个对象，那么哪个是核心对象，哪些类适合交给Spring来管理，因为spring默认是单例的，所有他管理的核心对象最好是无状态的，单例的，对于sqlSessionFactory来说它只创建一次，而sqlSession每次用的时候都要获取，用完还要关闭，而accountDao更不用说了，它本来就是由sqlSession创建的。(就像是在没学框架之前写那个mybatis工具类时只需在工具类中创建一次sqlSessionFactory对象，之后都是由工具类创建sqlSession对象)所以核心对象就是sqlSessionFactory对象

整合Mybatis

使用SqlSessionFactoryBean封装SqlSessionFactory需要的环境信息

使用MapperScannerConfigurer加载Dao接口，创建代理对象保存到IOC容器中

代码实现

前置工作
创建与数据库表对应的实体类，还有dao接口并写对应的方法以及对应的sql语句

public class Student {

    private Integer id;

    private String name;

    public Student() {
    }

    public Student(Integer id, String name) {
        this.id = id;
        this.name = name;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Override
    public String toString() {
        return "Student{" +
                "id=" + id +
                ", name='" + name + '\'' +
                '}';
    }
}

public interface StudentDao {

    @Select("select * from student where id = #{id}")
    Student findById(Integer id);
}

导入依赖

 <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.2.10.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.2.10.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.5.11</version>
    </dependency>

    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.3.0</version>
    </dependency>

    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.1.16</version>
    </dependency>

    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.46</version>
    </dependency>
  </dependencies>

创建JdbcConfig配置DataSource数据源

jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/spring_db?useSSL=false
jdbc.username=root
jdbc.password=root

JdbcConfig

public class JdbcConfig {
    @Value("${jdbc.driver}")
    private String driver;
    @Value("${jdbc.url}")
    private String url;
    @Value("${jdbc.username}")
    private String userName;
    @Value("${jdbc.password}")
    private String password;

    @Bean
    public DataSource dataSource(){
        DruidDataSource ds = new DruidDataSource();
        ds.setDriverClassName(driver);
        ds.setUrl(url);
        ds.setUsername(userName);
        ds.setPassword(password);
        return ds;
    }
}

创建MybatisConfig整合Mybatis

public class MybatisConfig {
    //定义bean，SqlSessionFactoryBean，用于产生SqlSessionFactory对象
    @Bean
    public SqlSessionFactoryBean sqlSessionFactory(DataSource dataSource){
        SqlSessionFactoryBean ssfb = new SqlSessionFactoryBean();
        ssfb.setTypeAliasesPackage("com.itheima.domain");
        ssfb.setDataSource(dataSource);
        return ssfb;
    }
    //定义bean，返回MapperScannerConfigurer对象
    @Bean
    public MapperScannerConfigurer mapperScannerConfigurer(){
        MapperScannerConfigurer msc = new MapperScannerConfigurer();
        msc.setBasePackage("com.itheima.dao");
        return msc;
    }
}

创建SpringConfig主配置类进行包扫描和加载其他配置类

@Configuration
@ComponentScan("com.itheima")
//@PropertySource：加载类路径jdbc.properties文件
@PropertySource("classpath:jdbc.properties")
@Import({JdbcConfig.class,MybatisConfig.class})
public class SpringConfig {
}

定义测试类进行测试

public class App {
    public static void main( String[] args ) {
        AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(SpringConfig.class);
        StudentDao studentDao = ctx.getBean(StudentDao.class);
        Student student = studentDao.findById(3);
        System.out.println(student);
    }
}

Spring整合Junit

导入依赖坐标

   <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>5.2.10.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.13</version>
    </dependency>

测试哪个类在test包下创建相同包的类(规范)

使用Spring整合junit专用的类加载器和加载配置类

//【第二步】使用Spring整合Junit专用的类加载器
@RunWith(SpringJUnit4ClassRunner.class)
//【第三步】加载配置文件或者配置类	
@ContextConfiguration(classes = {SpringConfiguration.class}) //加载配置类
//@ContextConfiguration(locations={"classpath:applicationContext.xml"})//加载配置文件
public class AccountServiceTest {
    //支持自动装配注入bean
    @Autowired
    private StudentDao studentDao;

    @Test
    public void testFindById(){
        Student student = studentDao.findById(1);
        System.out.println(student);
    }
}