Springboot整合druid的具体过程

网上的教程要么不全，要么有点坑，所以成功了之后留作纪念，仅供自己参考，水平有限，不足之处多多包涵。
1.建立一个springboot项目的过程网上都有，自己配置好数据库连接什么的，就不多叙述了。
2.application.properties里面配置上相关参数：（为什么不用yml文件，yml里面有的属性设置不了，暂时不想深究）具体参数如下：参数的具体意思去看看druid的项目，注意添加druid的pom依赖。

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://192.168.1.143:3306/****?useSSL=false&useUnicode=true&characterEncoding=UTF-8
spring.datasource.username=****
spring.datasource.password=****

spring.datasource.initialSize=5
spring.datasource.minIdle=5
spring.datasource.maxActive=20
spring.datasource.maxWait=60000
spring.datasource.timeBetweenEvictionRunsMillis=60000
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=SELECT 1 FROM DUAL
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
spring.datasource.poolPreparedStatements=true
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
spring.datasource.filters=stat,wall,log4j
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
#spring.datasource.useGlobalDataSourceStat=true

3.重点来了：网上有的教程这一步是没有的，因为springboot并不支持druid，所以要用@config去配置信息，并用@primary去用生成的druidDataSource去替换原有的datasource，保证以我们想要配置的druid数据源去运行；具体代码如下

@Configuration
public class DruidDBConfig {
    private Logger logger = LoggerFactory.getLogger(DruidDBConfig.class);

    @Value("${spring.datasource.url}")
    private String dbUrl;

    @Value("${spring.datasource.username}")
    private String username;

    @Value("${spring.datasource.password}")
    private String password;

    @Value("${spring.datasource.driverClassName}")
    private String driverClassName;

    @Value("${spring.datasource.initialSize}")
    private int initialSize;

    @Value("${spring.datasource.minIdle}")
    private int minIdle;

    @Value("${spring.datasource.maxActive}")
    private int maxActive;

    @Value("${spring.datasource.maxWait}")
    private int maxWait;

    @Value("${spring.datasource.timeBetweenEvictionRunsMillis}")
    private int timeBetweenEvictionRunsMillis;

    @Value("${spring.datasource.minEvictableIdleTimeMillis}")
    private int minEvictableIdleTimeMillis;

    @Value("${spring.datasource.validationQuery}")
    private String validationQuery;

    @Value("${spring.datasource.testWhileIdle}")
    private boolean testWhileIdle;

    @Value("${spring.datasource.testOnBorrow}")
    private boolean testOnBorrow;

    @Value("${spring.datasource.testOnReturn}")
    private boolean testOnReturn;

    @Value("${spring.datasource.poolPreparedStatements}")
    private boolean poolPreparedStatements;

    @Value("${spring.datasource.maxPoolPreparedStatementPerConnectionSize}")
    private int maxPoolPreparedStatementPerConnectionSize;

    @Value("${spring.datasource.filters}")
    private String filters;

    @Value("${spring.datasource.connectionProperties}")
    private String connectionProperties;

    @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(this.dbUrl);
        datasource.setUsername(username);
        datasource.setPassword(password);
        datasource.setDriverClassName(driverClassName);

        //configuration
        datasource.setInitialSize(initialSize);
        datasource.setMinIdle(minIdle);
        datasource.setMaxActive(maxActive);
        datasource.setMaxWait(maxWait);
        datasource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);
        datasource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);
        datasource.setValidationQuery(validationQuery);
        datasource.setTestWhileIdle(testWhileIdle);
        datasource.setTestOnBorrow(testOnBorrow);
        datasource.setTestOnReturn(testOnReturn);
        datasource.setPoolPreparedStatements(poolPreparedStatements);
        datasource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize);
        try {
            datasource.setFilters(filters);
        } catch (SQLException e) {
            logger.error("druid configuration initialization filter", e);
        }
        datasource.setConnectionProperties(connectionProperties);

        return datasource;
    }
}

其实换用下面的配置配置datasource也可以：

@Configuration
public class DruidDBConfig {
    private Logger logger = LoggerFactory.getLogger(DruidDBConfig.class);

    @Bean
    @Primary
    @ConfigurationProperties(prefix = "spring.datasource")
    public DataSource druidDataSource() {
        try {
            return new DruidDataSource();
        } catch (Exception e) {
            logger.error("设置数据源为druid时出错：" + e.getMessage());
            return null;
        }
    }
}

然后就是配置Druid的statView的2个servlet（第一个是配置过滤器的，第一个是配置访问路径账号密码等一些设置）：

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

需要注意@WebServle注解需要在比较高版本的servlet中使用（ ServletRegistrationBean 和FilterRegistrationBean也是可以的），作用就是之前用druid配置的xml文件里面一样的作用。这里贴一下自己的servlet版本，不要用springboot自带的

    <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.0-b07</version>
            <scope>provided</scope>
        </dependency>

下面主要是配置druid的一些基本信息，比如账号密码，白名单之类的，自己去查参数配置好了

@WebServlet(urlPatterns = "/druid/*", 
    initParams={
//            @WebInitParam(name="allow",value="192.168.16.110,127.0.0.1"),// IP白名单 (没有配置或者为空，则允许所有访问)
//            @WebInitParam(name="deny",value="192.168.16.111"),// IP黑名单 (存在共同时，deny优先于allow)
            @WebInitParam(name="loginUsername",value="root"),// 用户名
            @WebInitParam(name="loginPassword",value="123456"),// 密码
            @WebInitParam(name="resetEnable",value="false")// 禁用HTML页面上的“Reset All”功能
    })
public class DruidStatViewServlet extends StatViewServlet {



}

最后在springboot的启动函数上加上扫描配置
@MapperScan(basePackages = { “com.**.mapper” })
@ServletComponentScan

Springboot整合druid的具体过程

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