SSM17：注解开发管理第三方bean

 目录

建立空项目 

建立一个模块：maven项目

建立数据层dao和业务层service的接口和实现类文件

BookDao.class

BookDaoimpl.class

BookService.class

BookServiceimpl.class

建立测试类app.class

在pom.xml导入spring的两个坐标

SpringConfig.class

测试结果

 小结

---

建立空项目 

建立一个模块：maven项目

建立数据层dao和业务层service的接口和实现类文件

目录如下：

BookDao.class

package com.itheima.dao;
 
public interface BookDao {
    public void save();
 
}

BookDaoimpl.class

package com.itheima.dao.impl;
 
import com.itheima.dao.BookDao;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Repository;
 
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
 
//@Component
@Repository("b1")
@Scope
public class BookDaoimpl implements BookDao {
    @Value("${name}")
    private String name;
    public void save() {
        System.out.println("BookDao运行了"+name);
    }
    @PostConstruct
    public void init() {
        System.out.println("初始化成功");
    }
    @PreDestroy
    public void destroy() {
        System.out.println("销毁成功");
    }
}

BookService.class

package com.itheima.service;
 
public interface BookService {
    public void save();
}

BookServiceimpl.class

package com.itheima.service.impl;
 
import com.itheima.dao.BookDao;
import com.itheima.dao.impl.BookDaoimpl;
import com.itheima.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;
 
@Service
public class BookServiceimpl implements BookService {
    @Autowired//有了自动装配就不用写set方法了
    @Qualifier("b1")//多个相同类型的bean用@Qualifier("b2")区分
    private BookDao bookDao;
 
 
 
    public void save() {
        System.out.println("BookService运行了");
        bookDao.save();
    }
}

建立测试类app.class

package com.itheima;
 
import com.itheima.Config.SpringConfig;
import com.itheima.dao.BookDao;
import com.itheima.service.BookService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 
import javax.sql.DataSource;
 
public class APPText {
    public static void main(String[] args) {
        //新的加载配置类的方式
        AnnotationConfigApplicationContext ctx=new AnnotationConfigApplicationContext(SpringConfig.class);
        DataSource source = ctx.getBean(DataSource.class);
        System.out.println(source);
 
 
    }
}

在pom.xml导入spring的两个坐标

"1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0modelVersion>
 
    <groupId>org.examplegroupId>
    <artifactId>springzj06artifactId>
    <version>1.0-SNAPSHOTversion>
    <dependencies>
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-contextartifactId>
            <version>5.2.10.RELEASEversion>
        dependency>
        <dependency>
            <groupId>junitgroupId>
            <artifactId>junitartifactId>
            <version>4.12version>
            <scope>testscope>
        dependency>
        <dependency>
            <groupId>com.alibabagroupId>
            <artifactId>druidartifactId>
            <version>1.1.10version>
        dependency>
    dependencies>
 
    <properties>
        <maven.compiler.source>8maven.compiler.source>
        <maven.compiler.target>8maven.compiler.target>
    properties>
 
project>

SpringConfig.class

package com.itheima.Config;
 
import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.context.annotation.*;
 
import javax.sql.DataSource;
 
@Configuration
//@ComponentScan("com.itheima")
//@PropertySource({"jdbc.properties"})
@Import(jdbcConfig.class)
 
public class SpringConfig {
 
 
 
 
}

jdbcConfig.class

package com.itheima.Config;
 
import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.context.annotation.Bean;
 
import javax.sql.DataSource;
 
public class jdbcConfig {
    //将方法的返回值定义为一个bean
    @Bean
    public DataSource dataSource(){
        DruidDataSource ds=new DruidDataSource();
        ds.setDriverClassName("com.mysql.jdbc.Driver");
        ds.setUrl("jdbc:mysql://localhost:3306/db_librarysys");
        ds.setPassword("root");
        ds.setUsername("root");
        return ds;
    }
}

测试结果

 

 小结