Netty-Rest搭建笔记

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!");               // Ignored

2.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
    @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;
    }
}