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ApplicationContext ac = new AnnotationConfigApplicationContext(SpringConfiguration.class); SpringConfiguration配置類作為類

AnnotationConfigApplicationContext的參數(shù),那么SpringConfiguration就可以省略@Configuration. 如下

//@Configuration @ComponentScan(basePackages = {"com.atchina"}) public class SpringConfiguration {}

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在java中進(jìn)行顯式配置?

package soundsystem2;import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration;@Configuration public class CDPlayerConfig {// @Bean注解告訴spring這個(gè)方法將會(huì)返回一個(gè)對象，該對象// 要注冊為spring應(yīng)用上下文中的bean.@Beanpublic CompactDisc compactDisc(){return new SgtPeppers();}@Beanpublic CDPlayer cdPlayer(CompactDisc compactDisc){return new CDPlayer(compactDisc);} }

通過xml裝配bean

? ?spring剛剛出現(xiàn)時(shí),xml是描述配置的主要方式.但現(xiàn)在xml已經(jīng)不再是Spring的唯一可選方案。spring已經(jīng)有了強(qiáng)大的自動(dòng)化配置和基于java的配置，xml不再是第一選擇了。

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:c="http://www.springframework.org/schema/c"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"><!--配置bean --></beans>

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@Import注解

public class JdbcConfig {@Bean(name="runner")@Scope("prototype")public QueryRunner getRunner(DataSource dataSource){return new QueryRunner(dataSource);}@Bean("dataSource")public DataSource getDataSource(){ComboPooledDataSource dataSource = new ComboPooledDataSource();try {dataSource.setUser("root");dataSource.setPassword("1");dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/test");dataSource.setDriverClass("com.mysql.jdbc.Driver");}catch (Exception e){e.printStackTrace();}return dataSource;} }

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@PropertySource

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@ComponentScan(basePackages = {"com.atchina"}) @Import(JdbcConfig.class) @PropertySource("classpath:jdbcConfig.properties") public class SpringConfiguration {}public class JdbcConfig {@Value("${jdbc.username}")private String username;@Value("${jdbc.password}")private String password;@Value("${jdbc.url}")private String url;@Value("${jdbc.driver}")private String driver;@Bean(name="runner")@Scope("prototype")public QueryRunner getRunner(DataSource dataSource){return new QueryRunner(dataSource);}@Bean("dataSource")public DataSource getDataSource(){ComboPooledDataSource dataSource = new ComboPooledDataSource();try {dataSource.setUser(username);dataSource.setPassword(password);dataSource.setJdbcUrl(url);dataSource.setDriverClass(driver);}catch (Exception e){e.printStackTrace();}return dataSource;} }

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總結(jié)

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