Spring新注解

@Configuration

指定当前类是一个配置类
@ComponentScan

用于通过注解指定Spring创建容器时需要扫描的包
@Bean

将当前方法的返回值作为bean对象存入IoC容器中

如下类，可代替xml配置文件

package com.oylong.config;


import com.mchange.v2.c3p0.ComboPooledDataSource;
import org.apache.commons.dbutils.QueryRunner;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Scope;

import javax.sql.DataSource;
import java.beans.PropertyVetoException;

@Configuration
@ComponentScan("com.oylong")
public class SpringConfig {
    @Bean("queryRunner")
    @Scope("prototype")
    public QueryRunner creatQueryRunner(DataSource dataSource){
        return new QueryRunner(dataSource);
    }


    @Bean("dataSource")
    public DataSource creatDateSource() {
            ComboPooledDataSource ds = new ComboPooledDataSource();
        try {
            ds.setDriverClass("com.mysql.cj.jdbc.Driver");
        } catch (PropertyVetoException e) {
            e.printStackTrace();
        }
        ds.setJdbcUrl("jdbc:mysql://192.168.3.66:3306/test");
            ds.setUser("root");
            ds.setPassword("123123");
            return ds;
    }
}

在获取容器时，使用如下方法：

ApplicationContext applicationContext = new AnnotationConfigApplicationContext(SpringConfig.class);
AccountService accountService = applicationContext.getBean("accountService", AccountService.class);