SpringBoot引入druid连接池，并且开启数据监控

引入druid连接池

1.引入druid的相关依赖，并且引入log4j日志处理

<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.10</version>
</dependency>

<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>

2.在yml中配置连接池

datasource:
username: xxx
password: xxx
url: jdbc:mysql://localhost:3306/springboot?useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8
driver-class-name: com.mysql.cj.jdbc.Driver
type: com.alibaba.druid.pool.DruidDataSource
initialSize: 5
minIdle: 5
maxActive: 20
maxWait: 60000
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: SELECT 1 FROM DUAL
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
poolPreparedStatements: true
# 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
filters: stat,wall,log4j
maxPoolPreparedStatementPerConnectionSize: 20
useGlobalDataSourceStat: true
connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500

具体参数如下

3.配置log4j日志信息处理，注意，这里log4j放在resources文件夹下，文件名为log4j.properties

log4j.rootLogger=DEBUG, stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

4.创建dataSourceConfig类作连接池的配置类，注意点：这里必须使用前缀形式，这样属性会自动注入

@Configuration
public class DruidConfig {

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

5.配置数据监控

//1.配置servlet
@Bean
public ServletRegistrationBean statViewServlet(){
ServletRegistrationBean bean =
new ServletRegistrationBean(new StatViewServlet(), "/druid/*");//这里是访问druid的地址
HashMap<Object, Object> hashMap = new HashMap<>();
//druid数据监控的用户和密码
hashMap.put("loginUsername","admin");
hashMap.put("loginPassword","123456");
hashMap.put("allow","");//允许所有
bean.setInitParameters(hashMap);
return bean;
}
//配置过滤器，配置到达需要监控哪些，不需要监控哪些
@Bean
public FilterRegistrationBean webStatFilter(){
FilterRegistrationBean bean = new FilterRegistrationBean(new WebStatFilter());
HashMap<Object, Object> hashMap = new HashMap<>();
//这里排除一些不需要监控的资源
hashMap.put("exclusions","*.js,*.css,/druid/*");
bean.setInitParameters(hashMap);
bean.setUrlPatterns(Arrays.asList("/*"));
return bean;
}

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