Spring Boot-5整合Mybatis 使用数据源 c3p0 druid

Spring Boot整合Mybatis非常简单。只需两步：

引入必要依赖：

<dependency>
	<groupId>org.mybatis.spring.boot</groupId>
	<artifactId>mybatis-spring-boot-starter</artifactId>
	<version>1.3.1</version>
</dependency>
<dependency>
	<groupId>org.wisdom-framework</groupId>
	<artifactId>mysql-connector-java</artifactId>
	<version>5.1.34_1</version>
</dependency>

在application.properties文件中配置数据库信息

spring.datasource.url=jdbc:mysql://localhost:3306/ecfs
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

这样Spring Boot就整合了Mybatis。

如果想使用c3p0数据源，我们做以下配置：

引入c3p0依赖：

<dependency>
	<groupId>c3p0</groupId>
	<artifactId>c3p0</artifactId>
	<version>0.9.1.2</version>
</dependency>

配置数据源：

c3p0.jdbcUrl=jdbc:mysql://localhost:3306/ecfs?useUnicode=true&characterEncoding=utf8
c3p0.user=root
c3p0.password=root
c3p0.driverClass=com.mysql.jdbc.Driver
spring.datasource.type=com.mchange.v2.c3p0.ComboPooledDataSource

在配置类中进行配置：

@Configuration
public class DataSourceConfig {
	@Bean(name = "dataSource")
	@Primary
	@ConfigurationProperties(prefix = "c3p0")
	public DataSource dataSource() {
		return DataSourceBuilder.create().type(com.mchange.v2.c3p0.ComboPooledDataSource.class).build();
	}

	@Bean
	public SqlSessionFactoryBean sqlSessionFactory() {
		SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
		bean.setDataSource(dataSource());
		return bean;
	}
}

这样就完成了Spring Boot整合c3p0

使用druid数据源

druid简介：

可以监控数据库访问性能，Druid内置提供了一个功能强大的StatFilter插件，能够详细统计SQL的执行性能，这对于线上分析数据库访问性能有帮助。替换DBCP和C3P0。Druid提供了一个高效、功能强大、可扩展性好的数据库连接池。数据库密码加密。直接把数据库密码写在配置文件中，这是不好的行为，容易导致安全问题。DruidDruiver和DruidDataSource都支持PasswordCallback。 SQL执行日志，Druid提供了不同的LogFilter，能够支持Common-Logging、Log4j和JdkLog，你可以按需要选择相应的LogFilter，监控你应用的数据库访问情况。扩展JDBC，如果你要对JDBC层有编程的需求，可以通过Druid提供的Filter-Chain机制，很方便编写JDBC层的扩展插件。

引入依赖：

<dependency>
	<groupId>com.alibaba</groupId>
	<artifactId>druid</artifactId>
	<version>1.0.25</version>
</dependency>

application.properties配置数据源和连接池信息：

#驱动配置信息  
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource  
spring.datasource.url = jdbc:mysql://127.0.0.1:3306/mealsystem?useUnicode=true&characterEncoding=utf-8  
spring.datasource.username = root  
spring.datasource.password = 123456  
spring.datasource.driverClassName = com.mysql.jdbc.Driver  
   
#连接池的配置信息  
spring.datasource.initialSize=5  
spring.datasource.minIdle=5  
spring.datasource.maxActive=20  
spring.datasource.maxWait=60000  
spring.datasource.timeBetweenEvictionRunsMillis=60000  
spring.datasource.minEvictableIdleTimeMillis=300000  
spring.datasource.validationQuery=SELECT 1 FROM DUAL  
spring.datasource.testWhileIdle=true  
spring.datasource.testOnBorrow=false  
spring.datasource.testOnReturn=false  
spring.datasource.poolPreparedStatements=true  
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20  
spring.datasource.filters=stat,wall,log4j  
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000

druid定制信息的配置：

在Spring Boot1.5.2中驱动配置信息没有问题，但是连接池的配置信息不再支持这里的配置项，即无法通过配置项直接支持相应的连接池；这里列出的这些配置项可以通过定制化DataSource来实现。由于Druid暂时不在Spring Boo中的直接支持，故需要进行配置信息的定制： (1.5.9版本支持druid，不需要一下配置)

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.jdbc.DataSourceProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import com.alibaba.druid.pool.DruidDataSource;

/**
 *<p>Title: DruidDataSourceConfig.java</p>
 *<p>Description: 数据源属性配置</p>
 *<p>CreateDate: 2017年5月18日</p>
 *@author shen
 *@version v1.0
 */
@Configuration
@Primary //在同样的DataSource中，首先使用被标注的DataSource
public class DruidDataSourceConfig extends DataSourceProperties{

    private Logger logger = LoggerFactory.getLogger(DruidDataSourceConfig.class);

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    @Value("${spring.datasource.maxPoolPreparedStatementPerConnectionSize}")  
    private int maxPoolPreparedStatementPerConnectionSize;  

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

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

    @Bean     //声明其为Bean实例  
    public DataSource dataSource(){  
        DruidDataSource datasource = new DruidDataSource();  

        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;  
    }
}

配置监控统计功能：

import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;

/**
 *<p>Title: DruidConfiguration.java</p>
 *<p>Description: Druid监控配置</p>
 *<p>CreateDate: 2017年5月3日</p>
 *@author shen
 *@version v1.0
 */

@Configuration
public class DruidMonitorConfig {

    /**
     * 注册ServletRegistrationBean
     * @return
     */
    @Bean
    public ServletRegistrationBean registrationBean() {
        ServletRegistrationBean bean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
        /** 初始化参数配置，initParams**/
        //白名单
        bean.addInitParameter("allow", "127.0.0.1");//多个ip逗号隔开,允许配置的主机访问
        //IP黑名单 (存在共同时，deny优先于allow) : 如果满足deny的话提示:Sorry, you are not permitted to view this page.
        //bean.addInitParameter("deny", "192.168.1.73");
        //登录查看信息的账号密码.
        bean.addInitParameter("loginUsername", "admin");
        bean.addInitParameter("loginPassword", "123456");
        //是否能够重置数据.
        bean.addInitParameter("resetEnable", "false");
        return bean;
    }

    /**
     * 注册FilterRegistrationBean
     * @return
     */
    @Bean
    public FilterRegistrationBean druidStatFilter() {
        FilterRegistrationBean bean = new FilterRegistrationBean(new WebStatFilter());
        //添加过滤规则.
        bean.addUrlPatterns("/*");
        //添加不需要忽略的格式信息.
        bean.addInitParameter("exclusions","*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
        return bean;
    }

}

启动项目后访问 ip:端口/druid 输入配置类设置的账号密码进入监控后台

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