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

1.  
   <dependency>
2.  
   <groupId>org.springframework.boot</groupId>
3.  
   <artifactId>spring-boot-starter-jdbc</artifactId>
4.  
   </dependency>
5.  
   <dependency>
6.  
   <groupId>mysql</groupId>
7.  
   <artifactId>mysql-connector-java</artifactId>
8.  
   <scope>runtime</scope>
9.  
   </dependency>

2. 配置数据源

1.  
   server:
2.  
   port: 8085
3.  
   spring:
4.  
   application:
5.  
   name: user-service
6.  
   datasource:
7.  
   driver-class-name: com.mysql.jdbc.Driver
8.  
   url: jdbc:mysql://localhost:3306/hm49?serverTimezone=UTC&useUnicode=true@characterEncoding=utf-8
9.  
   username: root
10.  
    password: root

3. 测试连接

1.  
    
2.  
   import org.junit.jupiter.api.Test;
3.  
   import org.springframework.beans.factory.annotation.Autowired;
4.  
   import org.springframework.boot.test.context.SpringBootTest;
5.  
    
6.  
   import javax.sql.DataSource;
7.  
   import java.sql.Connection;
8.  
   import java.sql.SQLException;
9.  
    
10.  
    @SpringBootTest
11.  
    class DataApplicationTests {
12.  
     
13.  
    @Autowired
14.  
    DataSource dataSource;
15.  
     
16.  
    /**
17.  
    * 验证数据库连接
18.  
    * @throws Exception
19.  
    */
20.  
    @Test
21.  
    void testConnection() throws Exception {
22.  
    System.out.println(dataSource.getClass());
23.  
    Connection connection = dataSource.getConnection();
24.  
    System.out.println(connection);
25.  
    connection.close();
26.  
    }
27.  
     
28.  
    /**
29.  
    * 验证连接池的配置信息，是否生效
30.  
    * @throws Exception
31.  
    */
32.  
    /*@Test
33.  
    void contextLoads() throws Exception {
34.  
    System.out.println(dataSource.getClass());
35.  
    DruidDataSource druidDataSource = (DruidDataSource) dataSource;
36.  
    System.out.println("initSize:" druidDataSource.getInitialSize());
37.  
    System.out.println("maxSize:" druidDataSource.getMaxActive());
38.  
    Connection connection = dataSource.getConnection();
39.  
    System.out.println(connection);
40.  
    connection.close();
41.  
    }*/
42.  
     
43.  
    }

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

1.  
    
2.  
   <dependency>
3.  
   <groupId>com.alibaba</groupId>
4.  
   <artifactId>druid</artifactId>
5.  
   <version>1.1.12</version>
6.  
   </dependency>

2. 添加数据源的配置

1.  
   server:
2.  
   port: 8085
3.  
   spring:
4.  
   application:
5.  
   name: user-service
6.  
   datasource:
7.  
   driver-class-name: com.mysql.jdbc.Driver
8.  
   url: jdbc:mysql://localhost:3306/hm49?serverTimezone=UTC&useUnicode=true@characterEncoding=utf-8
9.  
   username: root
10.  
    password: root
11.  
    type: com.alibaba.druid.pool.DruidDataSource

3. 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

1.  
   server:
2.  
   port: 8085
3.  
   spring:
4.  
   application:
5.  
   name: user-service
6.  
   datasource:
7.  
   driver-class-name: com.mysql.jdbc.Driver
8.  
   url: jdbc:mysql://localhost:3306/hm49?serverTimezone=UTC&useUnicode=true@characterEncoding=utf-8
9.  
   username: root
10.  
    password: root
11.  
    type: com.alibaba.druid.pool.DruidDataSource
12.  
    #Spring Boot 默认是不注入这些属性值的，需要自己绑定
13.  
    #druid 数据源专有配置
14.  
    initialSize: 5
15.  
    minIdle: 5
16.  
    maxActive: 20
17.  
    maxWait: 60000
18.  
    timeBetweenEvictionRunsMillis: 60000
19.  
    minEvictableIdleTimeMillis: 300000
20.  
    validationQuery: SELECT 1 FROM DUAL
21.  
    testWhileIdle: true
22.  
    testOnBorrow: false
23.  
    testOnReturn: false
24.  
    poolPreparedStatements: true
25.  
     
26.  
    #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
27.  
    #如果允许时报错 java.lang.ClassNotFoundException: org.apache.log4j.Priority
28.  
    #则导入 log4j 依赖即可，Maven 地址： https://mvnrepository.com/artifact/log4j/log4j
29.  
    filters: stat,wall,log4j
30.  
    maxPoolPreparedStatementPerConnectionSize: 20
31.  
    useGlobalDataSourceStat: true
32.  
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
33.  
     
34.  
    #第一步连接数据库
35.  
    #第二步配置连接池 type
36.  
    #第三部测试查询jdbcTemplate.queryForList(sql);
37.  
    #第四部添加连接池配置

5. 写配置类加载Druid的配置

1.  
    
2.  
   import com.alibaba.druid.pool.DruidDataSource;
3.  
   import com.alibaba.druid.support.http.StatViewServlet;
4.  
   import com.alibaba.druid.support.http.WebStatFilter;
5.  
   import org.springframework.boot.context.properties.ConfigurationProperties;
6.  
   import org.springframework.boot.web.servlet.FilterRegistrationBean;
7.  
   import org.springframework.boot.web.servlet.ServletRegistrationBean;
8.  
   import org.springframework.context.annotation.Bean;
9.  
   import org.springframework.context.annotation.Configuration;
10.  
     
11.  
    import javax.servlet.Servlet;
12.  
    import javax.sql.DataSource;
13.  
    import java.util.Arrays;
14.  
    import java.util.HashMap;
15.  
    import java.util.Map;
16.  
     
17.  
    import com.alibaba.druid.pool.DruidDataSource;
18.  
    import org.springframework.boot.context.properties.ConfigurationProperties;
19.  
    import org.springframework.context.annotation.Bean;
20.  
    import org.springframework.context.annotation.Configuration;
21.  
     
22.  
    @Configuration
23.  
    public class DruidConfig {
24.  
    @ConfigurationProperties(prefix = "spring.datasource")
25.  
    @Bean
26.  
    public DataSource druidDataSource(){
27.  
    return new DruidDataSource();
28.  
    }
29.  
     
30.  
    @Bean
31.  
    public ServletRegistrationBean druidServletRegistrationBean(){
32.  
    ServletRegistrationBean<Servlet> servletRegistrationBean = new ServletRegistrationBean<>(new StatViewServlet(),"/druid/*");
33.  
    Map<String,String> initParams = new HashMap<>();
34.  
    initParams.put("loginUsername","admin");
35.  
    initParams.put("loginPassword","123456");
36.  
    //后台允许谁可以访问
37.  
    //initParams.put("allow", "localhost")：表示只有本机可以访问
38.  
    //initParams.put("allow", "")：为空或者为null时，表示允许所有访问
39.  
    initParams.put("allow","");
40.  
    //deny：Druid 后台拒绝谁访问
41.  
    // initParams.put("msb", "192.168.1.20");//表示禁止此ip访问
42.  
     
43.  
    servletRegistrationBean.setInitParameters(initParams);
44.  
    return servletRegistrationBean;
45.  
    }
46.  
     
47.  
    //配置 Druid 监控 之 web 监控的 filter
48.  
    //WebStatFilter：用于配置Web和Druid数据源之间的管理关联监控统计
49.  
    @Bean
50.  
    public FilterRegistrationBean webStatFilter() {
51.  
    FilterRegistrationBean bean = new FilterRegistrationBean();
52.  
    bean.setFilter(new WebStatFilter());
53.  
     
54.  
    //exclusions：设置哪些请求进行过滤排除掉，从而不进行统计
55.  
    Map<String, String> initParams = new HashMap<>();
56.  
    initParams.put("exclusions", "*.js,*.css,/druid/*");
57.  
    bean.setInitParameters(initParams);
58.  
     
59.  
    //"/*" 表示过滤所有请求
60.  
    bean.setUrlPatterns(Arrays.asList("/*"));
61.  
    return bean;
62.  
    }
63.  
    }

6. 引入log4j的依赖

1.  
   <!-- https://mvnrepository.com/artifact/log4j/log4j -->
2.  
   <dependency>
3.  
   <groupId>log4j</groupId>
4.  
   <artifactId>log4j</artifactId>
5.  
   <version>1.2.17</version>
6.  
   </dependency>

7. 测试一下数据库连接

1.  
   import org.springframework.beans.factory.annotation.Autowired;
2.  
   import org.springframework.jdbc.core.JdbcTemplate;
3.  
   import org.springframework.stereotype.Controller;
4.  
    
5.  
   import org.springframework.web.bind.annotation.RequestMapping;
6.  
   import org.springframework.web.bind.annotation.RestController;
7.  
    
8.  
   import java.util.List;
9.  
    
10.  
     
11.  
    @RestController
12.  
    public class JDBCController {
13.  
     
14.  
    @Autowired
15.  
    JdbcTemplate jdbcTemplate;
16.  
     
17.  
    @RequestMapping("selectAll")
18.  
    public List<Map<String,Object>> selectAll(){
19.  
    String sql = "select * from tb_user";
20.  
    List<Map<String, Object>> maps = jdbcTemplate.queryForList(sql);
21.  
    return maps;
22.  
    }
23.  
     
24.  
     
25.  
    }

8. 查看控制台的监控信息

http://localhost:8085/druid/login.html

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