springBoot(八)整合之整合阿里druid数据库连接池

         当时是基于C3P0处理数据库，然后偶发性出现连接超时，然后加上需要查看连接次数以及访问次数，我就想到采用druid数据库连接池，话不多说，先上代码

借鉴：http://blog.csdn.net/liuchuanhong1/article/details/55050131

1、pom.xml

		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
		</dependency>
		<!-- druid数据库 -->
		<!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
		<dependency>
		    <groupId>com.alibaba</groupId>
		    <artifactId>druid</artifactId>
		    <version>1.1.5</version>
		</dependency>

2、application.properties

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.url=jdbc:mysql://*********************?allowMultiQueries=true&autoReconnect=true 
spring.datasource.username=admin
spring.datasource.password=admin
spring.datasource.driverClassName=com.mysql.jdbc.Driver
#dataSource Pool configuration
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.exceptionSorter=true
spring.datasource.testOnReturn=false
spring.datasource.poolPreparedStatements=true
spring.datasource.filters=stat,wall,log4j
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
spring.datasource.useGlobalDataSourceStat=true

3、配置监控器

3.1、过滤不需要监控的后缀

/**  
 * 配置监控拦截器
 * druid监控拦截器  
 * @ClassName: DruidStatFilter   
 * @author linge  
 * @date 2017年7月24日 上午10:53:40  
 */  
@WebFilter(filterName="druidWebStatFilter",  
urlPatterns="/*",  
initParams={  
    @WebInitParam(name="exclusions",value="*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*"),// 忽略资源  
}) 
public class DruidStatFilter extends WebStatFilter {

}

3.2、监控视图配置

/**  
 * druid监控视图配置  
 * @ClassName: DruidStatViewServlet   
 * @author linge  
 * @date 2017年7月24日 上午10:54:27  
 */  
@WebServlet(urlPatterns = "/druid/*", initParams={  
    @WebInitParam(name="allow",value=""),// IP白名单 (没有配置或者为空，则允许所有访问)  
    @WebInitParam(name="deny",value="192.168.16.111"),// IP黑名单 (存在共同时，deny优先于allow)  
    @WebInitParam(name="loginUsername",value="admin"),// 用户名  
    @WebInitParam(name="loginPassword",value="admin"),// 密码  
    @WebInitParam(name="resetEnable",value="true")// 禁用HTML页面上的“Reset All”功能  
}) 
public class DruidStatViewServlet extends StatViewServlet {
	private static final long serialVersionUID = 2359758657306626394L;

}

如果仅仅这样配置，我这边不知道为什么和网上的不一样，我这边是用MyBatis来做数据处理的，这边就sql监控和sql防火墙监控都没有用，当前使用的spring boot版本为1.4.x版本

然后搜索了一番，数据源决定自己处理

@Configuration  
public class DruidConfiguration {  
    @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;  
    @Value("${spring.datasource.useGlobalDataSourceStat}")  
    private boolean useGlobalDataSourceStat;  
  
    @Bean     //声明其为Bean实例  
    @Primary  //在同样的DataSource中，首先使用被标注的DataSource  
    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);  
        datasource.setUseGlobalDataSourceStat(useGlobalDataSourceStat);  
        try {  
            datasource.setFilters(filters);  
        } catch (SQLException e) {  
            System.err.println("druid configuration initialization filter: "+ e);  
        }  
        datasource.setConnectionProperties(connectionProperties);  
        return datasource;  
    }  
}  

网站连入 ：http://localhost:8088/druid/login.html   

输入（ 3.2、监控视图配置）设置的密码，终于看到梦寐以求的数据，这个问题可能是只有这个版本才有或者有其他处理方法

注意：上面的这个类需要放到和application同级的目录下，这样才能在程序启动的时候初始化DataSource

如果测试中有其他问题或者解决方案，麻烦告知一下，共同进步，谢谢