0.相关知识
@Component、@Repository、@Service
@Repository
//@Scope设置bean的作用范围
@Scope("singleton")//单例 prototype每次创建都会给一个新实例。
public class BookDaoImpl implements BookDao {
//生命周期public void save() {System.out.println("book dao save ...");}//@PostConstruct设置bean的初始化方法@PostConstruct//在构造方法之前public void init() {System.out.println("init ...");}//@PreDestroy设置bean的销毁方法@PreDestroy//销毁之前public void destroy() {System.out.println("destroy ...");}}Autowired使用暴力反射，无需Setter方法了。
Config类
@Configuration//一般只写一个 ，其他的用Import
@ComponentScan("com.itheima")
//@Import:导入其他config类的配置信息
@Import({JdbcConfig.class})
//@PropertySource加载properties配置文件
@PropertySource({"jdbc.properties"})
public class SpringConfig {
}
@Service
public class BookServiceImpl implements BookService {//@Autowired：注入引用类型，自动装配模式，默认按类型装配@Autowired//@Qualifier：自动装配bean时按bean名称装配@Qualifier("bookDao")private BookDao bookDao;public void save() {System.out.println("book service save ...");bookDao.save();}
}
1.整合tinylog
1.新建tinylog.properties
writer = console
writer.file = log.txt
writer.level = info
2.使用
Logger.tag("SYSTEM").info("Hello World!"); // Output
Logger.info("Hello World!"); // Ignored2.整合Mybatis、druid、Spring框架
<dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.6</version></dependency><!-- 数据库驱动(以MySQL为例) --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.25</version></dependency><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>1.3.0</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>5.2.10.RELEASE</version></dependency>1.新建jdbc.properties文件，配置mysql连接配置（需要使用@PropertySource扫描）
2.新建配置类SpringConfig、JdbcConfig、MybatisConfig
package org.leo.web.config;import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.context.annotation.PropertySource;@Configuration
@ComponentScan("org.leo.web")
//@PropertySource：加载类路径jdbc.properties文件
@PropertySource("classpath:jdbc.properties")
@Import({JdbcConfig.class,MybatisConfig.class})
public class SpringConfig {
}
package org.leo.web.config;import com.alibaba.druid.pool.DruidDataSource;import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;import javax.sql.DataSource;public class JdbcConfig {@Value("${jdbc.driver}")//使用@Value注入private String driver;@Value("${jdbc.url}")private String url;@Value("${jdbc.username}")private String userName;@Value("${jdbc.password}")private String password;@Bean//告诉Spring容器，管理这个对象public DataSource dataSource(){DruidDataSource ds = new DruidDataSource();ds.setDriverClassName(driver);ds.setUrl(url);ds.setUsername(userName);ds.setPassword(password);return ds;}
}
package org.leo.web.config;import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.context.annotation.Bean;import javax.sql.DataSource;public class MybatisConfig {//定义bean，SqlSessionFactoryBean，用于产生SqlSessionFactory对象@Beanpublic 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@Beanpublic MapperScannerConfigurer mapperScannerConfigurer(){MapperScannerConfigurer msc = new MapperScannerConfigurer();msc.setBasePackage("com.itheima.dao");return msc;}
}
