集成mybatis（六）

config类配置综合：

package com.ssm.chapter22.config;

import java.util.Properties;

import javax.sql.DataSource;

import org.apache.commons.dbcp.BasicDataSourceFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ComponentScan.Filter;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.stereotype.Repository;
import org.springframework.stereotype.Service;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.transaction.annotation.TransactionManagementConfigurer;

@Configuration
//定义spring扫描的包
@ComponentScan(value="com.*",includeFilters= {@Filter(type=FilterType.ANNOTATION,value= {Service.class})})
//使用事务驱动管理器
@EnableTransactionManagement 
//实现TransactionManagementConfigurer，这样可以配置注解驱动事务
public class RootConfig implements TransactionManagementConfigurer {
    private DataSource dataSource=null;
    
    /**
     * 配置数据库
     * @return 数据库连接池
     */
    @Bean(name="dataSource")
    public DataSource initDataSource() {
        if(dataSource!=null) {
            return dataSource;
        }
        Properties props=new Properties();
        props.setProperty("driverClassName", "com.mysql.cj.jdbc.Driver");
        props.setProperty("url","jdbc:mysql://localhost:3306/ssm?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8&useSSL=false&allowMultiQueries=true&allowPublicKeyRetrieval=true");
        props.setProperty("userName","root");
        props.setProperty("password","123456abc");
        props.setProperty("maxActive","20");
        props.setProperty("maxIdle","20");
        props.setProperty("maxWait","30000");
        try {
            dataSource=BasicDataSourceFactory.createDataSource(props);
        }catch(Exception e) {
            e.printStackTrace();
        }
        return dataSource;
    }
    /**
     * 配置SqlSessionFactoryBean
     * @return SqlSessionFactoryBean
     */
    @Bean(name="sqlSessionFactory")
    public SqlSessionFactoryBean initSqlSessionFactory() {
        SqlSessionFactoryBean sqlSessionFactory=new SqlSessionFactoryBean();
        sqlSessionFactory.setDataSource(initDataSource());
        //配置MyBatis文件
        Resource resource=new ClassPathResource("mybatis/mybatis-config.xml");
        sqlSessionFactory.setConfigLocation(resource);
        return sqlSessionFactory;
    }
    /**
     * 通过自动扫描，发现MyBatis mapper接口
     * @return Mapper扫描器
     */
    @Bean
    public MapperScannerConfigurer initMapperScannerConfigurer() {
        MapperScannerConfigurer msc=new MapperScannerConfigurer();
        msc.setBasePackage("com.*");
        msc.setSqlSessionFactoryBeanName("sqlSessionFactory");
        msc.setAnnotationClass(Repository.class);
        return msc;
    }
    
    /**
     * 实现接口方法，注册注解事务，当@Transactional使用的时候产生数据库事务
     */
    @Bean(name="annotationDrivenTransactionManager")
    public PlatformTransactionManager annotationDrivenTransactionManager() {
        // TODO Auto-generated method stub
        DataSourceTransactionManager transactionManager=new DataSourceTransactionManager();
        transactionManager.setDataSource(initDataSource());
        return transactionManager;
    }

}