druid以及监控台使用及配置

一、druid

1.添加依赖

引入依赖

<dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.2.8</version></dependency><!-- jdbc --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-jdbc</artifactId></dependency><!-- mybatis --><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>1.3.1</version></dependency><!-- mysql驱动 --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency>

2.配置

配置yml文件

spring:datasource:username: rootpassword: rooturl: jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf8&useSSL=false&serverTimezone=UTC&driver-class-name: com.mysql.cj.jdbc.Drivertype: com.alibaba.druid.pool.DruidDataSource

配置数据源的三种方式
1.在配置类中创建一个数据源

@Value("spring.datasource.url")private String url;@Value("spring.datasource.username")private String userName;@Value("spring.datasource.password")private String password;@Value("spring.datasource.driver-class-name")private String driverClassName;@Value("spring.datasource.type")private String type;@Beanpublic DataSource dataSource(){DruidDataSource dataSource = new DruidDataSource();dataSource.setUrl(url);dataSource.setUsername(userName);dataSource.setPassword(password);dataSource.setDriverClassName(driverClassName);dataSource.setDbType(type);return dataSource;}

2.使用注解ConfigurationProperties

@Bean@ConfigurationProperties(prefix = "spring.datasource")public DataSource dataSource(){return new DruidDataSource();}

3.使用DataSourceProperties构造者设计模式

 @Beanpublic DataSource dataSource(DataSourceProperties properties){return properties.initializeDataSourceBuilder().build();}

二、监控台配置

1.创建配置类

/*** 监控台的servlet*/@Beanpublic ServletRegistrationBean statViewServlet() {ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean();servletRegistrationBean.setServlet(new StatViewServlet());servletRegistrationBean.addUrlMappings("/druid/*")// 添加IP白名单servletRegistrationBean.addInitParameter("allow", "127.0.0.1");// 添加IP黑名单，当白名单和黑名单重复时，黑名单优先级更高// servletRegistrationBean.addInitParameter("deny", "127.0.0.1");// 添加控制台管理用户servletRegistrationBean.addInitParameter("loginUsername", "admin");servletRegistrationBean.addInitParameter("loginPassword", "123456");// 是否能够重置数据servletRegistrationBean.addInitParameter("resetEnable", "false");return servletRegistrationBean;}/*** 配置服务过滤器 :监控哪些访问* @return 返回过滤器配置对象*/@Beanpublic FilterRegistrationBean statFilter() {FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();filterRegistrationBean.setFilter(new WebStatFilter());// 添加过滤规则filterRegistrationBean.addUrlPatterns("/*");// 忽略过滤格式filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*,");return filterRegistrationBean;}

本地访问http://localhost:8080/druid

三、Druid常用启动器

1.添加依赖

添加常用启动器依赖

<dependency><groupId>com.alibaba</groupId><artifactId>druid-spring-boot-starter</artifactId><version>1.2.8</version></dependency>

2.配置

依赖添加完成后，不需要创建数据源，可直接使用，但是访问Druid的控制台，却无法访问。
大致查看源码：

//创建一个DruidDataSourceWrapper数据源
@ConditionalOnMissingBeanpublic DataSource dataSource() {LOGGER.info("Init DruidDataSource");return new DruidDataSourceWrapper();}

@ConfigurationProperties("spring.datasource.druid")
public class DruidDataSourceWrapper extends DruidDataSource implements InitializingBean {@Autowiredprivate DataSourceProperties basicProperties;public DruidDataSourceWrapper() {}//重写InitializingBean方法，springboot启动时，会自动加载 public void afterPropertiesSet() throws Exception {if(super.getUsername() == null) {//从对象basicProperties中拿设置的用户名super.setUsername(this.basicProperties.determineUsername());}if(super.getPassword() == null) {//从对象basicProperties中拿设置的用户名super.setPassword(this.basicProperties.determinePassword());}if(super.getUrl() == null) {super.setUrl(this.basicProperties.determineUrl());}if(super.getDriverClassName() == null) {super.setDriverClassName(this.basicProperties.getDriverClassName());}}
}
//查看basicProperties
@ConfigurationProperties(prefix = "spring.datasource")
public class DataSourceProperties implements BeanClassLoaderAware, InitializingBean {private ClassLoader classLoader;private String name;private boolean generateUniqueName;private Class<? extends DataSource> type;private String driverClassName;....
}

由此看出，在yml文件数据源的配置：spring.datasource.url等等
我们在回头看上面的截图中：DruidDataSourceAutoConfigure类上@Import注解中引入DruidStatViewServletConfiguration.class，我们可以点开看看：

@ConditionalOnWebApplication
@ConditionalOnProperty(name = {"spring.datasource.druid.stat-view-servlet.enabled"},havingValue = "true"
)
public class DruidStatViewServletConfiguration {private static final String DEFAULT_ALLOW_IP = "127.0.0.1";public DruidStatViewServletConfiguration() {}@Beanpublic ServletRegistrationBean statViewServletRegistrationBean(DruidStatProperties properties) {//获取Druid监控台配置信息StatViewServlet config = properties.getStatViewServlet();ServletRegistrationBean registrationBean = new ServletRegistrationBean();registrationBean.setServlet(new com.alibaba.druid.support.http.StatViewServlet());registrationBean.addUrlMappings(new String[]{config.getUrlPattern() != null?config.getUrlPattern():"/druid/*"});if(config.getAllow() != null) {registrationBean.addInitParameter("allow", config.getAllow());} else {registrationBean.addInitParameter("allow", "127.0.0.1");}if(config.getDeny() != null) {registrationBean.addInitParameter("deny", config.getDeny());}if(config.getLoginUsername() != null) {registrationBean.addInitParameter("loginUsername", config.getLoginUsername());}if(config.getLoginPassword() != null) {registrationBean.addInitParameter("loginPassword", config.getLoginPassword());}if(config.getResetEnable() != null) {registrationBean.addInitParameter("resetEnable", config.getResetEnable());}return registrationBean;}
}

ConditionalOnProperty注解做了限制，由此可看出yml需要配置spring.datasource.druid.stat-view-servlet.enabled属性，且为true。其他的用户名、密码如何配置呢
配置信息都是从StatViewServlet类中获取，查看一下代码

@ConfigurationProperties("spring.datasource.druid")
public class DruidStatProperties {private String[] aopPatterns;private DruidStatProperties.StatViewServlet statViewServlet = new DruidStatProperties.StatViewServlet();public static class StatViewServlet {private boolean enabled;private String urlPattern;private String allow;private String deny;private String loginUsername;private String loginPassword;private String resetEnable;}}

由此看出：设置账号的spring.datasource.druid.StatViewServlet.loginUsername
yml的格式spring.datasource.druid.stat-view-servlet.login-username
其他配置同理