druid配置与使用

    # 数据源其他配置
    # 下面为连接池的补充设置，应用到上面所有数据源中
    # 初始化大小，最小，最大
    initialSize: 5
    minIdle: 5
    maxActive: 20
    # 配置获取连接等待超时的时间
    maxWait: 60000
    # 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
    timeBetweenEvictionRunsMillis: 60000
    # 配置一个连接在池中最小生存的时间，单位是毫秒
    minEvictableIdleTimeMillis: 300000
    validationQuery: SELECT 1 FROM DUAL
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
    # 打开PSCache，并且指定每个连接上PSCache的大小
    poolPreparedStatements: true
    #   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
    filters: stat,wall,log4j2 # log4j2
    web-stat-filter:
      exclusions: "*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*"
      enabled: true
      url-pattern: "/*"
    maxPoolPreparedStatementPerConnectionSize: 20
    # 合并多个DruidDataSource的监控数据
    useGlobalDataSourceStat: true
    # 通过connectProperties属性来打开mergeSql功能；慢SQL记录
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500

    @ConfigurationProperties(prefix = "spring.datasource")
    @Bean
    public DataSource druidDataSource(){
        return new DruidDataSource();
    }

    //后台监控
    @Bean
    public ServletRegistrationBean statViewServlet(){
        ServletRegistrationBean<StatViewServlet> bean = new ServletRegistrationBean<>(new StatViewServlet(), "/druid/*");

        //配置账号密码
        Map<String, String> InitParameters = new HashMap<>();
        InitParameters.put("loginUsername","admin");
        InitParameters.put("loginPassword","123456");

        //允许谁可以访问
        InitParameters.put("allow","");

        bean.setInitParameters(InitParameters);
        return bean;
    }

    //filter
    public FilterRegistrationBean webStatFilter(){
        FilterRegistrationBean<Filter> bean = new FilterRegistrationBean<>();

        bean.setFilter(new WebStatFilter());

        //可以过滤哪些请求
        Map<String, String> initParameters = new HashMap<>();
        initParameters.put("exclusions","*.css,*.js,/druid/*,/test*");

        return bean;
    }