spring boot 配置druid数据源

druid目前是国内最好的数据源了吧，下面利用druid来demo演示下spring boot如何配置jdbc数据源

1.在pom.xml中引入相关依赖

<dependency>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-starter-data-jpa</artifactId></dependency><dependency><groupId>com.alibaba</groupId>    <artifactId>druid</artifactId>    <version>1.0.15</version></dependency><dependency>    <groupId>mysql</groupId>    <artifactId>mysql-connector-java</artifactId>    <version>5.1.23</version></dependency>

上面引入spring-boot-starter-data-jpa，将引入spring-data-jpa和hibernate，hibernate是jpa的实现者，而spring data jpa在hibernate的基础上，再封装已层，数据访问更加方便和快速

2.在配置文件中，引入数据源配置参数

# 数据源基础配置spring.datasource.type=com.alibaba.druid.pool.DruidDataSourcespring.datasource.driver-class-name=com.mysql.jdbc.Driverspring.datasource.url=jdbc:mysql://localhost:3306/testspring.datasource.username=rootspring.datasource.password=root# 连接池配置# 初始化大小，最小，最大spring.datasource.initialSize=1spring.datasource.minIdle=1spring.datasource.maxActive=20# 配置获取连接等待超时的时间spring.datasource.maxWait=60000# 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 spring.datasource.timeBetweenEvictionRunsMillis=60000# 配置一个连接在池中最小生存的时间，单位是毫秒 spring.datasource.minEvictableIdleTimeMillis=300000spring.datasource.validationQuery=SELECT 1 FROM DUALspring.datasource.testWhileIdle=truespring.datasource.testOnBorrow=falsespring.datasource.testOnReturn=false# 打开PSCache，并且指定每个连接上PSCache的大小 spring.datasource.poolPreparedStatements=falsespring.datasource.maxPoolPreparedStatementPerConnectionSize=20# 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙 spring.datasource.filters=stat,wall# 通过connectProperties属性来打开mergeSql功能；慢SQL记录spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000# 是否在控制台显示sql语句spring.jpa.show-sql=true

如果想要在java代码读取这些配置，可以配置个实体类

@Component@ConfigurationProperties(prefix="spring.datasource")public class DatasourceSettings {    private String type ;    private String driver ;    private String url ;    private String username ;    private String password ;    private int initialSize ;    private int minIdle ;    private int maxActive ;    private int maxWait ;    private int timeBetweenEvictionRunsMillis ;    private int minEvictableIdleTimeMillis ;    private String validationQuery ;    private boolean testWhileIdle ;    private boolean testOnBorrow ;    private boolean testOnReturn ;    private boolean poolPreparedStatements ;    private int maxPoolPreparedStatementPerConnectionSize;    private String filters ;    private String connectionProperties ;    //sets and gets ..}

使用的时候，直接注入即可

@Autowired DatasourceSettings ds ;

3.配置/druid的数据监控页面路径还有拦截路径

@Beanpublic ServletRegistrationBean druidServlet() {    return new ServletRegistrationBean(new StatViewServlet(), "/druid/*");}@Beanpublic FilterRegistrationBean filterRegistrationBean() {    FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();    filterRegistrationBean.setFilter(new WebStatFilter());    filterRegistrationBean.addUrlPatterns("/*");    filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");    return filterRegistrationBean;}

这时可以在地址栏输入http://localhost:8080/demo/druid/来看看监控页面数据

到这里就已经把druid配置成功了，spring jpa data 也可以正常使用了