DruidDBConfiguration.java

package com.viontech.configuration;

import java.sql.SQLException;

import javax.sql.DataSource;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.condition.ConditionalOnExpression;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;

import com.alibaba.druid.pool.DruidDataSource;

@Configuration
public class DruidDBConfiguration {
    private Logger logger = LoggerFactory.getLogger(DruidDBConfiguration.class);

    @Value("${spring.datasource.url:127.0.0.1}")
    private String dbUrl;

    @Value("${spring.datasource.username:postgresql}")
    private String username;

    @Value("${spring.datasource.password:password}")
    private String password;

    @Value("${spring.datasource.driverClassName:driverClassName}")
    private String driverClassName;

    @Value("${spring.datasource.initialSize:0}")
    private int initialSize;

    @Value("${spring.datasource.minIdle:0}")
    private int minIdle;

    @Value("${spring.datasource.maxActive:1}")
    private int maxActive;

    @Value("${spring.datasource.maxWait:0}")
    private int maxWait;

    @Value("${spring.datasource.timeBetweenEvictionRunsMillis:0}")
    private int timeBetweenEvictionRunsMillis;

    @Value("${spring.datasource.minEvictableIdleTimeMillis:0}")
    private int minEvictableIdleTimeMillis;

    @Value("${spring.datasource.validationQuery:0}")
    private String validationQuery;

    @Value("${spring.datasource.testWhileIdle:false}")
    private boolean testWhileIdle;

    @Value("${spring.datasource.testOnBorrow:false}")
    private boolean testOnBorrow;

    @Value("${spring.datasource.testOnReturn:false}")
    private boolean testOnReturn;

    @Value("${spring.datasource.poolPreparedStatements:false}")
    private boolean poolPreparedStatements;

    @Value("${spring.datasource.maxPoolPreparedStatementPerConnectionSize:0}")
    private int maxPoolPreparedStatementPerConnectionSize;
    private String filters;

    @Value("${spring.datasource.connectionProperties:connectionProperties}")
    private String connectionProperties;

    @Bean     //声明其为Bean实例  
    @Primary  //在同样的DataSource中，首先使用被标注的DataSource
    @ConditionalOnExpression("#{'${spring.datasource.driverClassName:false}'!='false'}")
    public DataSource dataSource() {
        DruidDataSource datasource = new DruidDataSource();
        if ("driverClassName".equals(driverClassName)) {
            return null;
        }

        datasource.setUrl(this.dbUrl);
        datasource.setUsername(username);
        datasource.setPassword(password);
        datasource.setDriverClassName(driverClassName);

        //configuration  
        datasource.setInitialSize(initialSize);
        datasource.setMinIdle(minIdle);
        datasource.setMaxActive(maxActive);
        datasource.setMaxWait(maxWait);
        datasource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);
        datasource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);
        datasource.setValidationQuery(validationQuery);
        datasource.setTestWhileIdle(testWhileIdle);
        datasource.setTestOnBorrow(testOnBorrow);
        datasource.setTestOnReturn(testOnReturn);
        datasource.setPoolPreparedStatements(poolPreparedStatements);
        datasource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize);
        try {
            datasource.setFilters(filters);
        } catch (SQLException e) {
            logger.error("druid configuration initialization filter", e);
        }
        datasource.setConnectionProperties(connectionProperties);

        return datasource;
    }
}