SpringBoot配置Druid
目录
一、JDBC连接数据库
1. 创建项目，导入需要的依赖
2. 配置数据源
3. 测试连接
4. 项目启动成功，能够看出连接信息
二、配置数据库连接池Druid
1. 添加druid的maven配置
2. 添加数据源的配置
3. 重新执行测试代码，发现数据库连接池已经更改
4. 添加Druid其他增强的配置
5. 写配置类加载Druid的配置
6. 引入log4j的依赖
7. 测试一下数据库连接
8. 查看控制台的监控信息
Druid是Java语言中最好的数据库连接池。Druid能够提供强大的监控和扩展功能。
Druid 是一个 JDBC 组件库，包含数据库连接池、SQL Parser 等组件, 被大量业务和技术产品使用或集成，经历过最严苛线上业务场景考验，是你值得信赖的技术产品。
一、JDBC连接数据库
1. 创建项目，导入需要的依赖
org.springframework.boot
spring-boot-starter-jdbc
mysql
mysql-connector-java
runtime
2. 配置数据源
server:
port: 8085
spring:
application:
name: user-service
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/hm49?serverTimezone=UTC&useUnicode=true@characterEncoding=utf-8
username: root
password: root3. 测试连接
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.SQLException;
@SpringBootTest
class DataApplicationTests {
@Autowired
DataSource dataSource;
/**
* 验证数据库连接
* @throws Exception
*/
@Test
void testConnection() throws Exception {
System.out.println(dataSource.getClass());
Connection connection = dataSource.getConnection();
System.out.println(connection);
connection.close();
}
/**
* 验证连接池的配置信息，是否生效
* @throws Exception
*/
/*@Test
void contextLoads() throws Exception {
System.out.println(dataSource.getClass());
DruidDataSource druidDataSource = (DruidDataSource) dataSource;
System.out.println("initSize:" + druidDataSource.getInitialSize());
System.out.println("maxSize:" + druidDataSource.getMaxActive());
Connection connection = dataSource.getConnection();
System.out.println(connection);
connection.close();
}*/
}4. 项目启动成功，能够看出连接信息
默认配置的数据源为class com.zaxxer.hikari.HikariDataSource
二、配置数据库连接池Druid
1. 添加druid的maven配置
com.alibaba
druid
1.1.12
2. 添加数据源的配置
server:
port: 8085
spring:
application:
name: user-service
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/hm49?serverTimezone=UTC&useUnicode=true@characterEncoding=utf-8
username: root
password: root
type: com.alibaba.druid.pool.DruidDataSource3. 重新执行测试代码，发现数据库连接池已经更改
此时配置的数据源为com.alibaba.druid.pool.DruidDataSource
4. 添加Druid其他增强的配置
官网介绍如下：常见问题 · alibaba/druid Wiki · GitHub
server:
port: 8085
spring:
application:
name: user-service
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/hm49?serverTimezone=UTC&useUnicode=true@characterEncoding=utf-8
username: root
password: root
type: com.alibaba.druid.pool.DruidDataSource
#Spring Boot 默认是不注入这些属性值的，需要自己绑定
#druid 数据源专有配置
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，stat:监控统计、log4j：日志记录、wall：防御sql注入
#如果允许时报错 java.lang.ClassNotFoundException: org.apache.log4j.Priority
#则导入 log4j 依赖即可，Maven 地址： https://mvnrepository.com/artifact/log4j/log4j
filters: stat,wall,log4j
maxPoolPreparedStatementPerConnectionSize: 20
useGlobalDataSourceStat: true
connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
#第一步连接数据库
#第二步配置连接池+type
#第三部测试查询jdbcTemplate.queryForList(sql);
#第四部添加连接池配置5. 写配置类加载Druid的配置
import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.springframework.boot.context.properties.ConfigurationProperties;
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 javax.servlet.Servlet;
import javax.sql.DataSource;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class DruidConfig {
@ConfigurationProperties(prefix = "spring.datasource")
@Bean
public DataSource druidDataSource(){
return new DruidDataSource();
}
@Bean
public ServletRegistrationBean druidServletRegistrationBean(){
ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean<>(new StatViewServlet(),"/druid/*");
Map initParams = new HashMap<>();
initParams.put("loginUsername","admin");
initParams.put("loginPassword","123456");
//后台允许谁可以访问
//initParams.put("allow", "localhost")：表示只有本机可以访问
//initParams.put("allow", "")：为空或者为null时，表示允许所有访问
initParams.put("allow","");
//deny：Druid 后台拒绝谁访问
// initParams.put("msb", "192.168.1.20");//表示禁止此ip访问
servletRegistrationBean.setInitParameters(initParams);
return servletRegistrationBean;
}
//配置 Druid 监控 之 web 监控的 filter
//WebStatFilter：用于配置Web和Druid数据源之间的管理关联监控统计
@Bean
public FilterRegistrationBean webStatFilter() {
FilterRegistrationBean bean = new FilterRegistrationBean();
bean.setFilter(new WebStatFilter());
//exclusions：设置哪些请求进行过滤排除掉，从而不进行统计
Map initParams = new HashMap<>();
initParams.put("exclusions", "*.js,*.css,/druid/*");
bean.setInitParameters(initParams);
//"/*" 表示过滤所有请求
bean.setUrlPatterns(Arrays.asList("/*"));
return bean;
}
}
6. 引入log4j的依赖
log4j
log4j
1.2.17
7. 测试一下数据库连接
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
@RestController
public class JDBCController {
@Autowired
JdbcTemplate jdbcTemplate;
@RequestMapping("selectAll")
public List> selectAll(){
String sql = "select * from tb_user";
List> maps = jdbcTemplate.queryForList(sql);
return maps;
}
} 8. 查看控制台的监控信息
http://localhost:8085/druid/login.html
