springboot + druid的两种配置方式

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最近在做自己的创业项目的网站，打算使用前后端分离的方式去做，前端使用vue，后端使用springboot，数据库连接池使用druid

第一次使用Java做web项目，梳理一下，做个记录。

1. druid简介：

Druid是阿里巴巴开源的数据库连接池，号称是Java语言中最好的数据库连接池，能够提供强大的监控和扩展功能

2. druid优点：

可以监控数据库访问性能，Druid内置提供了一个功能强大的StatFilter插件，能够详细统计SQL的执行性能，这对于线上分析数据库访问性能有帮助。
替换DBCP和C3P0，Druid提供了一个高效、功能强大、可扩展性好的数据库连接池。
数据库密码加密。直接把数据库密码写在配置文件中，这是不好的行为，容易导致安全问题。DruidDriver和DruidDataSource都支持PasswordCallback。
SQL执行日志，Druid提供了不同的LogFilter，能够支持Common-Logging、Log4j和JdkLog，你可以按需要选择相应的LogFilter，监控你应用的数据库访问情况。
扩展JDBC，如果你要对JDBC层有编程的需求，可以通过Druid提供的Filter-Chain机制，很方便编写JDBC层的扩展插件。

3. 第一种配置方式（application.properties）

pox.xml配置如下：

<?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>2.0.4.RELEASE</version>-->
        <version>2.2.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.tilyp</groupId>
    <artifactId>cxcy</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>cxcy</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-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </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>

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.datatype</groupId>
            <artifactId>jackson-datatype-joda</artifactId>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.module</groupId>
            <artifactId>jackson-module-parameter-names</artifactId>
        </dependency>

        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.2.5</version>
        </dependency>
        
        # mysql
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        
        # druid
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>
        <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.properties配置

server.port=8000

spring.jpa.show-sql = true
logging.level.org.springframework.data=DEBUG
spring.jpa.hibernate.ddl-auto=
spring.application.name=cxcy

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/cxcy?serverTimezone=UTC&characterEncoding=utf8&useUnicode=true&useSSL=false&characterEncoding=utf8
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.druid.initial-size=5
spring.datasource.druid.min-idle=5
spring.datasource.druid.maxActive=20
spring.datasource.druid.maxWait=60000
spring.datasource.druid.timeBetweenEvictionRunsMillis=60000
spring.datasource.druid.minEvictableIdleTimeMillis=300000
spring.datasource.druid.validationQuery=SELECT 1 FROM DUAL
spring.datasource.druid.testWhileIdle=true
spring.datasource.druid.testOnBorrow=false
spring.datasource.druid.testOnReturn=false
spring.datasource.druid.poolPreparedStatements=true
spring.datasource.druid.maxPoolPreparedStatementPerConnectionSize=20
spring.datasource.druid.filters=stat,wall,slf4j
spring.datasource.druid.connectionProperties=druid.stat.mergeSql\=true;druid.stat.slowSqlMillis\=5000
spring.datasource.druid.web-stat-filter.enabled=true
spring.datasource.druid.web-stat-filter.url-pattern=/*
spring.datasource.druid.web-stat-filter.exclusions=*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*
spring.datasource.druid.stat-view-servlet.url-pattern=/druid/*
spring.datasource.druid.stat-view-servlet.allow=127.0.0.1
spring.datasource.druid.stat-view-servlet.deny=
spring.datasource.druid.stat-view-servlet.reset-enable=false
spring.datasource.druid.stat-view-servlet.login-username=admin
spring.datasource.druid.stat-view-servlet.login-password=123456


logging.level.root = INFO
logging.level.org.hibernate = INFO
logging.level.org.hibernate.type.descriptor.sql.BasicBinder = TRACE
logging.level.org.hibernate.type.descriptor.sql.BasicExtractor = TRACE
logging.level.org.springframework.web.servlet.DispatcherServlet = DEBUG

运行服务后访问http://127.0.0.1:8000/druid/login.html

输入配置中配置的用户名（admin）和密码（123456）后

4. 第二种配置方式（注解）

pom.xml配置同上，但是要修改springboot版本号，否则启动会报错如下错误

2019-12-19 11:04:00.732 ERROR 1480 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

***************************
APPLICATION FAILED TO START
***************************

Description:

The bean 'dataSource', defined in class path resource [com/alibaba/druid/spring/boot/autoconfigure/DruidDataSourceAutoConfigure.class], could not be registered. A bean with that name has already been defined in class path resource [com/tilyp/cxcy/webservice/config/DruidDBConfig.class] and overriding is disabled.

Action:

Consider renaming one of the beans or enabling overriding by setting spring.main.allow-bean-definition-overriding=true

springboot的版本配置如下：

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
        <!--<version>2.2.1.RELEASE</version>-->
        <relativePath/> <!-- lookup parent from repository -->
</parent>

创建一个配置类

@Configuration
@EnableAutoConfiguration(exclude = {
        org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration.class
})
public class DruidDBConfig {
    private Logger logger = LoggerFactory.getLogger(DruidDBConfig.class);

    @Bean     //声明其为Bean实例
    @Primary  //在同样的DataSource中，首先使用被标注的DataSource
    public DataSource dataSource(){
        DruidDataSource datasource = new DruidDataSource();

        datasource.setUrl("jdbc:mysql://localhost:3306/cxcy?serverTimezone=UTC&characterEncoding=utf8&useUnicode=true&useSSL=false&characterEncoding=utf8");
        datasource.setUsername("root");
        datasource.setPassword("123456");
        datasource.setDriverClassName("com.mysql.jdbc.Driver");

        //configuration
        datasource.setInitialSize(5);
        datasource.setMinIdle(5);
        datasource.setMaxActive(20);
        datasource.setMaxWait(60000);
        datasource.setTimeBetweenEvictionRunsMillis(60000);
        datasource.setMinEvictableIdleTimeMillis(300000);
        datasource.setValidationQuery("SELECT 1 FROM DUAL");
        datasource.setTestWhileIdle(true);
        datasource.setTestOnBorrow(false);
        datasource.setTestOnReturn(false);
        datasource.setPoolPreparedStatements(true);
        datasource.setMaxPoolPreparedStatementPerConnectionSize(20);
        try {
            datasource.setFilters("stat,wall,slf4j");
        } catch (SQLException e) {
            logger.error("druid configuration initialization filter", e);
        }
        datasource.setConnectionProperties("druid.stat.mergeSql\\=true;druid.stat.slowSqlMillis\\=5000");

        return (DataSource) datasource;
    }
}

配置监控拦截器

@WebFilter(filterName = "druidWebStatFilter",urlPatterns = "/*",initParams = {
        // 忽略资源
        @WebInitParam(name = "exclusions", value = "*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*")
})
public class DruidStatFilter extends WebStatFilter {
}

配置监控视图

@WebServlet(urlPatterns = "/druid/*",initParams = {
        //IP白名单 没有配置或者为空则允许所有访问
        @WebInitParam(name="allow",value = "127.0.0.1"),
        // IP黑名单 存在共同时，deny优先于allow
        @WebInitParam(name = "deny", value = "192.168.1.10"),
        // 用户名
        @WebInitParam(name = "loginUsername", value = "admin"),
        // 密码
        @WebInitParam(name = "loginPassword", value = "123456"),
        // 禁用HTML页面上的“Reset All”功能
        @WebInitParam(name = "resetEnable", value = "false")
})
public class DruidStatViewServlet extends StatViewServlet {
}

在启动类添加注解 @ServletComponentScan

@SpringBootApplication
//配置druid必须加的注解，如果不加，访问页面打不开，filter和servlet、listener之类的需要单独进行注册才能使用，spring boot里面提供了该注解起到注册作用
@ServletComponentScan  
public class CxcyApplication extends SpringBootServletInitializer {

    public static void main(String[] args) {
        SpringApplication.run(CxcyApplication.class, args);
    }
}

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