springboot整合druid

pom檔案

<?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>2.3.5.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>
  <groupId>com.dtg</groupId>
  <artifactId>springdruid</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>springdruid</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-data-jpa</artifactId>
    </dependency>
    <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>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
      <exclusions>
        <exclusion>
          <groupId>org.junit.vintage</groupId>
          <artifactId>junit-vintage-engine</artifactId>
        </exclusion>
      </exclusions>
    </dependency>
​
    <!-- druid 依賴-->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid-spring-boot-starter</artifactId>
      <version>1.1.21</version>
    </dependency>
​
    <!-- druid監控 依賴-->
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.17</version>
    </dependency>
​
  </dependencies>
​
  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
    </plugins>
  </build>
​
</project>
​
 

application.yml配置

spring:
 datasource:
  username: root
  password: root
  url: jdbc:mysql://localhost:3306/test?serverTimezone=UTC&useUnicode=true@characterEncoding=utf-8
  driver-class-name: com.mysql.cj.jdbc.Driver
  type: com.alibaba.druid.pool.DruidDataSource
 #Spring Boot 預設是不注入這些屬性值的，需要自己繫結
 #druid 資料來源專有配置
  initialSize: 5
  minIdle: 5
  maxActive: 20
  maxWait: 60000
  timeBetweenEvictionRunsMillis: 60000
  minEvictableIdleTimeMillis: 300000
  validationQuery: SELECT 1 FROM DUAL
  testWhileIdle: true
  testOnBorrow: false
  testOnReturn: false
 # 開啟PSCache
  poolPreparedStatements: true
 #配置監控統計攔截的filters，stat:監控統計、log4j：日誌記錄、wall：防禦sql注入
 #如果執行時報錯  java.lang.ClassNotFoundException: org.apache.log4j.Priority
 #則匯入 log4j 依賴即可，Maven 地址： https://mvnrepository.com/artifact/log4j/log4j
  filters: stat,wall,log4j,config
 #指定每個連線上PSCache的大小
  maxPoolPreparedStatementPerConnectionSize: 20
 #合併多個DruidDataSource的監控資料
  useGlobalDataSourceStat: true
 #通過connectProperties屬性來開啟mergeSql功能；慢SQL記錄
  connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
​
server:
 port: 8080
 

新增DruidConfig配置類

使druid 資料來源專有配置生效

package com.dtg.springdruid.config;
​
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.sql.DataSource;
import java.util.HashMap;
import java.util.Map;
​
@Configuration
public class DruidConfig {
​
  @ConfigurationProperties(prefix = "spring.datasource")
  @Bean
  public DataSource druidDataSource() {
    return new DruidDataSource();
   }
​
  //因為Springboot內建了servlet容器，所以沒有web.xml，替代方法就是將ServletRegistrationBean註冊進去
  //加入後臺監控
  @Bean //這裡其實就相當於servlet的web.xml
  public ServletRegistrationBean statViewServlet() {
    ServletRegistrationBean <StatViewServlet> bean =
        new ServletRegistrationBean <StatViewServlet>(new StatViewServlet(), "/druid/*");
​
    //後臺需要有人登入，進行配置
    //bean.addUrlMappings(); 這個可以新增對映，我們在構造裡已經寫了
    //設定一些初始化引數
    Map <String, String> initParas = new HashMap <String, String>();
    initParas.put("loginUsername", "admin");//它這個賬戶密碼是固定的
    initParas.put("loginPassword", "123456");
    //允許誰能防偽
    initParas.put("allow", "");//這個值為空或沒有就允許所有人訪問，ip白名單
    //initParas.put("allow","localhost");//只允許本機訪問，多個ip用逗號,隔開
    //initParas.put("deny","");//ip黑名單，拒絕誰訪問 deny和allow同時存在優先deny
    initParas.put("resetEnable", "false");//禁用HTML頁面的Reset按鈕
    bean.setInitParameters(initParas);
    return bean;
   }
​
  //再配置一個過濾器，Servlet按上面的方式註冊Filter也只能這樣
  @Bean
  public FilterRegistrationBean webStatFilter() {
    FilterRegistrationBean bean = new FilterRegistrationBean();
    //可以設定也可以獲取,設定一個阿里巴巴的過濾器
    bean.setFilter(new WebStatFilter());
    bean.addUrlPatterns("/*");
    //可以過濾和排除哪些東西
    Map <String, String> initParams = new HashMap <String, String>();
    //把不需要監控的過濾掉,這些不進行統計
    initParams.put("exclusions", "*.js,*.css,/druid/*");
    bean.setInitParameters(initParams);
    return bean;
   }
}
 

編寫測試類

package com.dtg.springdruid;
​
import com.alibaba.druid.pool.DruidDataSource;
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 SpringdruidApplicationTests {
​
  @Autowired
  DataSource dataSource;
​
​
  @Test
  void contextLoads() {
​
    System.out.println(dataSource.getClass());
    Connection connection = null;
    try {
      connection = dataSource.getConnection();
     } catch (SQLException e) {
      e.printStackTrace();
     }
    System.out.println(connection);
​
    DruidDataSource druidDataSource = (DruidDataSource)dataSource;
    System.out.println(druidDataSource.getMaxActive());
    System.out.println(druidDataSource.getInitialSize());
    try {
      connection.close();
     } catch (SQLException e) {
      e.printStackTrace();
     }
   }
​
}
​

測試結果

class com.alibaba.druid.pool.DruidDataSource com.alibaba.druid.proxy.jdbc.ConnectionProxyImpl@44faa4f2 20 5