spring注解开发快速入门

1.编写配置类

//SpringConifg
@Configuration    //表名配置类，在容器创建时加载
@ComponentScan("com")    //扫描com包下所有组件
@Import(DataSourceConfig.class)   //导入其他配置类
public class SpringConfig {
}
//DataSourceConfig.class
@Configuration
@PropertySource("classpath:jdbc.properties")  //引入外部文件
public class DataSourceConfig {
    @Value("${jdbc.driver}")
    private String driver;
    @Value("${jdbc.url}")
    private String jdbcurl;
    @Value("${jdbc.user}")
    private String user;
    @Value("${jdbc.password}")
    private String password;
    @Bean("ComboPooled")   //表名将该方法的返回值储存到Spring容器中,标识为ComboPooled
    public ComboPooledDataSource get() throws PropertyVetoException {
        ComboPooledDataSource dataSource=new ComboPooledDataSource();
        dataSource.setDriverClass(driver);
        dataSource.setJdbcUrl(jdbcurl);
        dataSource.setUser(user);
        dataSource.setPassword(password);
        return dataSource;
    }
    @Bean("Druid")
    public DataSource getDurid() throws PropertyVetoException {
        DruidDataSource druidDataSource=new DruidDataSource();
        druidDataSource.setDriverClassName(driver);
        druidDataSource.setUrl(jdbcurl);
        druidDataSource.setUsername(user);
        druidDataSource.setPassword(password);
        return druidDataSource;
    }
}

2.外部配置文件

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/test-spring?useUnicode=true&characterEncoding=utf8
jdbc.user=root
jdbc.password=

3.组件

@Component
public class BookConfig {
    @Bean("Book1")
    public Book getbook(){
        Book book=new Book("三国演义",25);
        return book;
    }
}

4.编写spring集合Junit的测试

@RunWith(SpringJUnit4ClassRunner.class)
//@ContextConfiguration(value=Application.xml)  //配置文件
@ContextConfiguration(classes = {SpringConfig.class})   //配置类
public class TestSpring {
    @Autowired
    private Book book;
    @Autowired
    @Qualifier("ComboPooled")
    private DataSource dataSource;
    /*@Autowired
    @Qualifier("Druid")*/
    @Resource(name="Druid")
    private DataSource source;
    @Test
    public void test1(){
        System.out.println(book.toString());
    }
    @Test
    public  void test2() throws SQLException {
       Connection connection= dataSource.getConnection();
        System.out.println("ComboPooled:"+connection);
        connection.close();
        connection=source.getConnection();
        System.out.println("Druid:"+connection);
        connection.close();
    }
}