基于 Spring Boot 的 SSM 环境整合七：配置 druid

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    上一篇中已通过 druid 连接池使用 sqlite 数据库，我使用 druid 连接池更多的是想使用强大的监控功能，但在配置时遇到了很多问题（因 SQLITE），暂时还没有解决 。故我将数据库由 sqlite 变更为 mysql，建表语句和数据参考上一篇。

1、修改 pom.xml

首先是删除原 druid  和 sqlite 资源，并增加新的 druid 和 mysql 资源。即删除如下资源：

    <dependency>
		<groupId>com.alibaba</groupId>
		<artifactId>druid</artifactId>
		<version>1.0.31</version>
	</dependency>
<dependency>
	    <groupId>org.xerial</groupId>
	    <artifactId>sqlite-jdbc</artifactId>
	    <version>3.7.2</version>
	</dependency>

然后引入如下资源：

    <!-- 连接池 -->
	<dependency>
		<groupId>com.alibaba</groupId>
		<artifactId>druid-spring-boot-starter</artifactId>
		<version>1.1.10</version>
	</dependency>
	
	<!-- mysql -->
	<dependency>
		<groupId>mysql</groupId>
		<artifactId>mysql-connector-java</artifactId>
		<scope>runtime</scope>
	</dependency>

保存后即得执行 Maven install。完成后的 pom.xml 如下：

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.whowii</groupId>
  <artifactId>website_java4</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  
  <!-- 引入spring-boot-start-parent 以提供dependency management，也就是依赖管理，引入以后在声明其它dependency的时候就不需要version了 -->
  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.3.RELEASE</version>
  </parent>
  
  <dependencies>
  	<!-- 引入spring-boot-starter-web 以包含spring webmvc和tomcat等web开发的特性 -->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
      <exclusions>
        <exclusion>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-logging</artifactId>
        </exclusion>
      </exclusions>
    </dependency>
    
    <!-- 连接池 -->
	<dependency>
		<groupId>com.alibaba</groupId>
		<artifactId>druid-spring-boot-starter</artifactId>
		<version>1.1.10</version>
	</dependency>
	
	<!-- mysql -->
	<dependency>
		<groupId>mysql</groupId>
		<artifactId>mysql-connector-java</artifactId>
		<scope>runtime</scope>
	</dependency>

    <!-- mybatis -->
	<dependency>
	  <groupId>org.mybatis</groupId>
	  <artifactId>mybatis</artifactId>
	  <version>3.4.4</version>
	</dependency>
	<dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>1.3.1</version>
    </dependency>
    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>1.1.1</version>
    </dependency>
    
    <!-- thymeleaf 模板 -->
    <dependency>
      <groupId>org.springframework.boot </groupId>
      <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>
    
    <!-- log4j2 -->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-log4j2</artifactId>
    </dependency>
    
    <!-- 日志工具
    <dependency>
        <groupId>org.apache.tomcat.embed</groupId>
        <artifactId>tomcat-embed-logging-juli</artifactId>
        <version>8.0.23</version>
    </dependency> -->
    
    <!-- spring mvc -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>${spring.version}</version>
    </dependency>
	<dependency>
	    <groupId>org.springframework</groupId>
	    <artifactId>spring-beans</artifactId>
        <version>${spring.version}</version>
	    <type>jar</type>
	</dependency>
	<dependency>
	    <groupId>org.springframework</groupId>
	    <artifactId>spring-orm</artifactId>
        <version>${spring.version}</version>
	    <type>jar</type>
	</dependency>
    
    <!-- aop 依赖 -->
    <dependency>  
        <groupId>org.aspectj</groupId>  
        <artifactId>aspectjrt</artifactId>  
        <version>1.6.11</version>  
    </dependency>  
    <dependency>  
        <groupId>org.aspectj</groupId>  
        <artifactId>aspectjweaver</artifactId>  
        <version>1.6.11</version>  
    </dependency>
  </dependencies>

  <build>
    <finalName>website_java4</finalName>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
      <!-- 增加main方式启动的配置，若使用maven的spring-boot:run方式启动则不需要此配置 -->
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
        <configuration>
        	<!-- 设置主类入口 -->
        	<mainClass>com.whowii.website4.AppBoot</mainClass>
        	<!-- 设置classpath -->
        	<addClasspath>true</addClasspath>
            <classpathPrefix>lib/</classpathPrefix>
        </configuration>
      </plugin>
    </plugins>
  </build>
  
  <properties>
  	<!-- spring 版本 -->
    <spring.version>4.3.8.RELEASE</spring.version>
    <!-- java 版本 -->
    <java.version>1.8</java.version>
  	<!-- 设置编码 -->
  	<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>
</project>

2、修改 spring boot 配置

修改配置文件“application.properties”，删除 sqlite 配置，并增加 druid 和 mysql 相关配置，完成后的代码如下：

# tomcat 端口
server.port=8080

# spring mvc 配置（视图解析器）
spring.mvc.view.prefix=/WEB-INF/view/
spring.mvc.view.suffix=.jsp

# log4j2 配置
logging.config=classpath\:log4j2.xml

# 关闭thymeleaf缓存，仅在开发时使用
spring.thymeleaf.cache=false
# 检查模板是否存在，然后再呈现
spring.thymeleaf.check-template-location=true
# Content-Type值
spring.thymeleaf.content-type=text/html
# 在构建URL时预先查看名称的前缀
spring.thymeleaf.prefix=classpath:/templates/
# 构建URL时附加查看名称的后缀.
spring.thymeleaf.suffix=.html

# JDBC 配置
spring.datasource.druid.url=jdbc:mysql://localhost:3306/website_java4?useUnicode=true&characterEncoding=UTF-8
spring.datasource.druid.username=root
spring.datasource.druid.password=root
# 打开PSCache，并且指定每个连接上PSCache的大小（防火墙这一块一定不能开，sqlite不支持，会导致奇怪的异常）
spring.datasource.poolPreparedStatements=true
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
# 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
spring.datasource.filters=stat,wall,log4j
# 通过connectProperties属性来打开mergeSql功能；慢SQL记录
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
# 合并多个DruidDataSource的监控数据
spring.datasource.useGlobalDataSourceStat=true

# 连接池配置
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.druid.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.druid.initial-size=5
spring.datasource.druid.max-active=100
spring.datasource.druid.min-idle=5
## 配置获取连接等待超时的时间
spring.datasource.druid.max-wait=60000
## 打开PSCache，并且指定每个连接上PSCache的大小
spring.datasource.druid.pool-prepared-statements=true
spring.datasource.druid.max-pool-prepared-statement-per-connection-size=20
spring.datasource.druid.validation-query=SELECT 1 FROM DUAL
spring.datasource.druid.validation-query-timeout=60000
spring.datasource.druid.test-on-borrow=false
spring.datasource.druid.test-on-return=false
spring.datasource.druid.test-while-idle=true
## 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
spring.datasource.druid.time-between-eviction-runs-millis=60000
## 配置一个连接在池中最小生存的时间，单位是毫秒
spring.datasource.druid.min-evictable-idle-time-millis=100000

# 监控配置
# WebStatFilter配置，说明请参考Druid Wiki，配置_配置WebStatFilter
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,*.png,*.css,*.ico,/druid/*
# StatViewServlet配置，说明请参考Druid Wiki，配置_StatViewServlet配置
spring.datasource.druid.stat-view-servlet.enabled=true
spring.datasource.druid.stat-view-servlet.url-pattern=/druid/*
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=admin
spring.datasource.druid.stat-view-servlet.allow=127.0.0.1
 #访问黑名单
spring.datasource.druid.stat-view-servlet.deny=192.168.32.139

# Filter 配置
# 配置StatFilter
spring.datasource.druid.filter.stat.db-type=mysql
spring.datasource.druid.filter.stat.log-slow-sql=true
spring.datasource.druid.filter.stat.slow-sql-millis=5000
# 配置WallFilter
spring.datasource.druid.filter.wall.enabled=true
spring.datasource.druid.filter.wall.db-type=mysql
spring.datasource.druid.filter.wall.config.delete-allow=false
spring.datasource.druid.filter.wall.config.drop-table-allow=false


# mybatis 配置
mybatis.mapper-locations=classpath:mapper/sysuser-mapper.xml
mybatis.typeAliasesPackage=com.whowii.website4.admin.model

3、增加 druid 配置类

在包“com.whowii.website4”下新增java类“DruidDataSource”，代码如下:

package com.whowii.website4;

import javax.sql.DataSource;

import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder;

@Configuration
@ConditionalOnClass(com.alibaba.druid.pool.DruidDataSource.class)
@ConditionalOnProperty(name = "spring.datasource.type", havingValue = "com.alibaba.druid.pool.DruidDataSource", matchIfMissing = true)
public class DruidDataSource {

	@Bean
	@ConfigurationProperties("spring.datasource.druid")
	public DataSource dataSourceOne() {
		return DruidDataSourceBuilder.create().build();
	}

}

4、测试结果

启动项目后首先访问“http://127.0.0.1:8080/demo/index”，可以看到页面能正常访问。

然后访问“http://127.0.0.1:8080/druid/”：

用户S名和密码都是上面配置的（均是admin），登录后如下：

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点击“SQL监控”可以看到页面执行的SQL语句：

截止到目前的项目代码：https://download.csdn.net/download/xz2001/10776223