【README】

本文記錄了 springboot配置 druid數據源的步驟；

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【1】新建springboot項目并配置druid

步驟1，新建springbt項目

?步驟2，選擇spring web，jdbc，mysql驅動依賴；

步驟3，添加 druid數據源依賴， 生成的pom.xml 如下：

<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.5.5</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.cmc</groupId><artifactId>springbt-06-data-jdbc2</artifactId><version>0.0.1-SNAPSHOT</version><name>springbt-06-data-jdbc2</name><description>Demo project for Spring Boot</description><properties><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-jdbc</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><scope>runtime</scope></dependency><!-- 引入druid數據源 --><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.2.8</version></dependency><!-- https://mvnrepository.com/artifact/log4j/log4j --><dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>1.2.17</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

注意，必須添加 log4j 依賴，因為 druid用到了它，不然會報

Failed to bind properties under 'spring.datasource' to javax.sql.DataSource

步驟4，添加druid數據源配置， 啟用 druid數據源

application.yml

# 配置springboot數據源 spring:datasource:username: rootpassword: rooturl: jdbc:mysql://192.168.163.204:3306/jdbc01driver-class-name: com.mysql.cj.jdbc.Drivertype: com.alibaba.druid.pool.DruidDataSource # 啟用druid數據源# 數據源其他配置initialSize: 6minIdle: 6maxActive: 26maxWait: 60000timeBetweenEvictionRunsMillis: 60000minEvictableIdleTimeMillis: 300000testWhileIdle: truetestOnBorrow: falsetestOnReturn: falsepoolPreparedStatements: true# 配置監控統計攔截的filters，去掉后監控界面sql無法統計，'wall'用于防火墻filters: stat,wall,log4jmaxPoolPreparedStatementPerConnectionSize: 20useGlobalDataSourceStat: trueconnectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500

步驟5，添加測試用例

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 Springbt06DataJdbc2ApplicationTests {@AutowiredDataSource dataSource;@Testvoid contextLoads() throws SQLException {System.out.println("數據源=" + dataSource.getClass());Connection conn = dataSource.getConnection();System.out.println("我的測試連接=" + conn);conn.close();} }

打印結果：

數據源=class com.alibaba.druid.pool.DruidDataSource
2021-10-17 08:18:50.867? INFO 7488 --- [?????????? main] com.alibaba.druid.pool.DruidDataSource?? : {dataSource-1} inited
我的測試連接=com.mysql.cj.jdbc.ConnectionImpl@54e02f6a

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?【2】使用druid并配置druid監控頁面

步驟1，添加web訪問配置

application.properties

# 服務器配置 server.port=8082 server.servlet.context-path=/springbt-data2

步驟2，添加controller訪問路徑，查詢數據庫表

@Controller public class HelloController {@AutowiredJdbcTemplate jdbcTemplate;@ResponseBody@GetMapping("/query")public Map<String, Object> map() {List<Map<String, Object>> list = jdbcTemplate.queryForList("select * from department");return list.get(0);} }

步驟3，添加druid數據源

// 導入druid數據源 @Configuration public class DruidConfig {@ConfigurationProperties(prefix = "spring.datasource")@Beanpublic DataSource druid() {return new DruidDataSource();}// 配置druid監控// 1 配置一個管理后臺的servlet@Beanpublic ServletRegistrationBean statViewServlet() {ServletRegistrationBean bean = new ServletRegistrationBean<>(new StatViewServlet(), "/druid/*");// 配置相關參數Map<String, String> params = new HashMap<>();params.put("loginUsername", "admin");params.put("loginPassword", "admin");params.put("allow", "localhost"); // 默認允許所有訪問params.put("deny", "192.168.163.204"); // 默認允許所有訪問bean.setInitParameters(params);return bean;}// 2 配置一個監控的filter@Beanpublic FilterRegistrationBean webStatFilter() {FilterRegistrationBean bean = new FilterRegistrationBean<>();bean.setFilter(new WebStatFilter());// 配置相關參數Map<String, String> params = new HashMap<>();params.put("exclusions", "*.js,*.css,/druid/*");bean.setInitParameters(params);bean.setUrlPatterns(Arrays.asList("/*"));return bean;} }

步驟4，先執行query 請求；

http://localhost:8082/springbt-data2/query

步驟5，查看druid sql監控頁面

http://localhost:8082/springbt-data2/druid/login.html

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步驟6，查看sql監控；?

補充： springboot配置druid及測試案例的目錄結構?

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