springboot集成druid连接池（数据库密码加密）

1.springboot默认连接池

习惯使用springboot的小伙伴通过开始学习springboot链接数据库时，都会尝试着官方文档来学习，所以springboot默认支持的数据库连接池c3p0和 dhcp，大家应该都很熟悉了吧，只需要在.propeties文件中配置下数据库连接字符串即可，默认采用c3p0链接池进行连接数据库，但是今天我着重记录的并非官方默认支持的链接池，而是集成性能不错的阿里数据源druid。

2.阿里连接池druid介绍

Druid介绍

Druid是一个JDBC组件，druid 是阿里开源在 github 上面的数据库连接池,它包括三部分：
* DruidDriver 代理Driver，能够提供基于Filter－Chain模式的插件体系。
* DruidDataSource 高效可管理的数据库连接池。
* SQLParser 专门解析 sql 语句

Druid 有什么优点？
1. 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。
2. 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。
3. 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。DruidDruiver和DruidDataSource都支持PasswordCallback。
4. 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。
5. 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.druid加解密浅析

首先我们来看下 druid加密的过程

通过命令：

java -cp druid-1.0.16.jar com.alibaba.druid.filter.config.ConfigTools you_password

返回值如下：publickey代表公钥，privatekey是密码加密后的结果

privateKey:MIIBVgIBADANBgkqhkiG9w0BAQEFAASCAUAwggE8AgEAAkEA6+4avFnQKP+O7bu5YnxWoOZjv3no4aFV558HTPDoXs6EGD0HP7RzzhGPOKmpLQ1BbA5viSht+aDdaxXp6SvtMQIDAQABAkAeQt4fBo4SlCTrDUcMANLDtIlax/I87oqsONOg5M2JS0jNSbZuAXDv7/YEGEtMKuIESBZh7pvVG8FV531/fyOZAiEA+POkE+QwVbUfGyeugR6IGvnt4yeOwkC3bUoATScsN98CIQDynBXC8YngDNwZ62QPX+ONpqCel6g8NO9VKC+ETaS87wIhAKRouxZL38PqfqV/WlZ5ZGd0YS9gA360IK8zbOmHEkO/AiEAsES3iuvzQNYXFL3x9Tm2GzT1fkSx9wx+12BbJcVD7AECIQCD3Tv9S+AgRhQoNcuaSDNluVrL/B/wOmJRLqaOVJLQGg==  
publicKey:MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAOvuGrxZ0Cj/ju27uWJ8VqDmY7956OGhVeefB0zw6F7OhBg9Bz+0c84RjzipqS0NQWwOb4kobfmg3WsV6ekr7TECAwEAAQ==

通过加密时使用的命令我们不难看出druid对数据库密码加解密用的是configFilter这个类，所以在配置数据源链接时务必将该filter添加上，否则始终会抛出数据库连接异常，而druid是有重试机制的，默认重试30次，如果数据库做了限制频繁账号尝试连接的话，该账号有可能被锁定，导致线上数据库写入出现问题，所以缺了这样的配置实用加密连接还是蛮恐怖的，直接影响线上环境。

4.springboot使用druid（废话少说直接上代码）

首先加入依赖如下：针对该依赖配置信息（由于springboot未能全面支持druid 所以需要配置datasource)

<dependency>
     <groupId>com.alibaba</groupId>
     <artifactId>druid</artifactId>
      <version>1.0.20</version>
</dependency>

# 驱动配置信息
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.url = jdbc:mysql://127.0.0.1:3306/myspringboot
spring.datasource.username = your account
spring.datasource.password = your encryt password
spring.datasource.driverClassName = com.mysql.jdbc.Driver

# 连接池的配置信息
# 初始化大小，最小，最大
spring.datasource.initialSize=5
spring.datasource.minIdle=5
spring.datasource.maxActive=20
# 配置获取连接等待超时的时间
spring.datasource.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
spring.datasource.timeBetweenEvictionRunsMillis=60000
# 配置一个连接在池中最小生存的时间，单位是毫秒
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=SELECT 1 FROM DUAL
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
# 打开PSCache，并且指定每个连接上PSCache的大小
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=config,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;config.decrpt=true;config.decrypt.key=your public key

/**
 * Created by wk on 2018/1/10.
 */
@Configuration
@ConfigurationProperties(prefix="spring.datasources")
public class DataSourceConfig {
    private Logger logger = LoggerFactory.getLogger(DataSourceConfig.class);
    private String type;
    private String url;
    private String driverClassName;
    private String username;
    private String password;
    private Integer initialSize;
    private Integer minIdle;
    private Integer maxActive;
    private Integer maxWait;
    private Integer timeBetweenEvictionRunsMillis;
    private Integer minEvictableIdleTimeMillis;
    private String validationQuery;
    private Boolean testWhileIdle;
    private Boolean testOnBorrow;
    private Boolean testOnReturn;
    private Boolean poolPreparedStatements;
    private Integer maxPoolPreparedStatementPerConnectionSize;
    private String filters;
    private String connectionProperties;

    public String getDriverClassName() {
        return driverClassName;
    }

    public void setDriverClassName(String driverClassName) {
        this.driverClassName = driverClassName;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public Integer getInitialSize() {
        return initialSize;
    }

    public void setInitialSize(Integer initialSize) {
        this.initialSize = initialSize;
    }

    public Integer getMinIdle() {
        return minIdle;
    }

    public void setMinIdle(Integer minIdle) {
        this.minIdle = minIdle;
    }

    public Integer getMaxActive() {
        return maxActive;
    }

    public void setMaxActive(Integer maxActive) {
        this.maxActive = maxActive;
    }

    public Integer getMaxWait() {
        return maxWait;
    }

    public void setMaxWait(Integer maxWait) {
        this.maxWait = maxWait;
    }

    public Integer getTimeBetweenEvictionRunsMillis() {
        return timeBetweenEvictionRunsMillis;
    }

    public void setTimeBetweenEvictionRunsMillis(Integer timeBetweenEvictionRunsMillis) {
        this.timeBetweenEvictionRunsMillis = timeBetweenEvictionRunsMillis;
    }

    public Integer getMinEvictableIdleTimeMillis() {
        return minEvictableIdleTimeMillis;
    }

    public void setMinEvictableIdleTimeMillis(Integer minEvictableIdleTimeMillis) {
        this.minEvictableIdleTimeMillis = minEvictableIdleTimeMillis;
    }

    public String getValidationQuery() {
        return validationQuery;
    }

    public void setValidationQuery(String validationQuery) {
        this.validationQuery = validationQuery;
    }

    public Boolean getTestWhileIdle() {
        return testWhileIdle;
    }

    public void setTestWhileIdle(Boolean testWhileIdle) {
        this.testWhileIdle = testWhileIdle;
    }

    public Boolean getTestOnBorrow() {
        return testOnBorrow;
    }

    public void setTestOnBorrow(Boolean testOnBorrow) {
        this.testOnBorrow = testOnBorrow;
    }

    public Boolean getTestOnReturn() {
        return testOnReturn;
    }

    public void setTestOnReturn(Boolean testOnReturn) {
        this.testOnReturn = testOnReturn;
    }

    public Boolean getPoolPreparedStatements() {
        return poolPreparedStatements;
    }

    public void setPoolPreparedStatements(Boolean poolPreparedStatements) {
        this.poolPreparedStatements = poolPreparedStatements;
    }

    public Integer getMaxPoolPreparedStatementPerConnectionSize() {
        return maxPoolPreparedStatementPerConnectionSize;
    }

    public void setMaxPoolPreparedStatementPerConnectionSize(Integer maxPoolPreparedStatementPerConnectionSize) {
        this.maxPoolPreparedStatementPerConnectionSize = maxPoolPreparedStatementPerConnectionSize;
    }

    public String getFilters() {
        return filters;
    }

    public void setFilters(String filters) {
        this.filters = filters;
    }

    public String getConnectionProperties() {
        return connectionProperties;
    }
    public void setConnectionProperties(String connectionProperties) {
        this.connectionProperties = connectionProperties;
    }
    @Bean
    public ServletRegistrationBean druidServlet() {
        ServletRegistrationBean reg = new ServletRegistrationBean();
        reg.setServlet(new StatViewServlet());
        reg.addUrlMappings("/druid/*");
        reg.addInitParameter("loginUsername", username);
        reg.addInitParameter("loginPassword", password);
        return reg;
    }
    @Bean
    public FilterRegistrationBean filterRegistrationBean() {
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
        filterRegistrationBean.setFilter(new WebStatFilter());
        filterRegistrationBean.addUrlPatterns("/*");
        filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
        filterRegistrationBean.addInitParameter("profileEnable", "true");
        return filterRegistrationBean;
    }
    @Bean
    @Primary
    public DataSource druidDataSource() {
        DruidDataSource datasource = new DruidDataSource();
        datasource.setUrl(url);
        datasource.setUsername(username);
        datasource.setPassword(password);
        datasource.setDriverClassName(driverClassName);
        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);
        String paramArray[] = connectionProperties.split(";");
        datasource.setConnectionProperties(connectionProperties);
        try {
            datasource.setFilters(filters);
        } catch (SQLException e) {
            logger.error("druid configuration initialization filter", e);
        }
        return datasource;
    }
}

2.或者直接用druid-spring-boot-starter druid-spring-boot-starter项目

<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.0</version>
</dependency>

######Druid数据源配置######
	# JDBC配置
	spring.datasource.druid.url= # 或spring.datasource.url=
	spring.datasource.druid.username= # 或spring.datasource.username=
	spring.datasource.druid.password= # 或spring.datasource.password=
	spring.datasource.druid.driver-class-name= #或 spring.datasource.driver-class-name=

	# 连接池配置,下面配置说明请参考Druid Github Wiki，配置_DruidDataSource参考配置
	spring.datasource.druid.initial-size=
	spring.datasource.druid.max-active=
	spring.datasource.druid.min-idle=
	spring.datasource.druid.max-wait=
	spring.datasource.druid.pool-prepared-statements=
	spring.datasource.druid.max-pool-prepared-statement-per-connection-size=
	spring.datasource.druid.max-open-prepared-statements= #等价于上面的max-pool-prepared-statement-per-connection-size
	spring.datasource.druid.validation-query=
	spring.datasource.druid.validation-query-timeout=
	spring.datasource.druid.test-on-borrow=
	spring.datasource.druid.test-on-return=
	spring.datasource.druid.test-while-idle=
	spring.datasource.druid.time-between-eviction-runs-millis=
	spring.datasource.druid.min-evictable-idle-time-millis=
	spring.datasource.druid.max-evictable-idle-time-millis=
	spring.datasource.druid.filters= #默认值stat，配置多个英文逗号分隔
	...
	# 更多配置属性见 DruidDataSource 内成员变量（只要有set方法便支持），或者根据IDE提示，或者查看官方文档

	######Druid监控配置######
	#下面配置说明请参考Druid Github Wiki，配置_配置WebStatFilter
	spring.datasource.druid.web-stat-filter.enabled= #是否启用StatFilter默认值true
	spring.datasource.druid.web-stat-filter.url-pattern=
	spring.datasource.druid.web-stat-filter.exclusions=
	spring.datasource.druid.web-stat-filter.session-stat-enable=
	spring.datasource.druid.web-stat-filter.session-stat-max-count=
	spring.datasource.druid.web-stat-filter.principal-session-name=
	spring.datasource.druid.web-stat-filter.principal-cookie-name=
	spring.datasource.druid.web-stat-filter.profile-enable=
	#下面配置说明请参考Druid Github Wiki，配置_StatViewServlet配置
	spring.datasource.druid.stat-view-servlet.enabled= #是否启用StatViewServlet默认值true
	spring.datasource.druid.stat-view-servlet.url-pattern=
	spring.datasource.druid.stat-view-servlet.reset-enable=
	spring.datasource.druid.stat-view-servlet.login-username=
	spring.datasource.druid.stat-view-servlet.login-password=
	spring.datasource.druid.stat-view-servlet.allow=
	spring.datasource.druid.stat-view-servlet.deny=
	#下面配置说明请参考Druid Github Wiki，配置_Druid和Spring关联监控配置
	spring.datasource.druid.aop-patterns= #Spring监控AOP切入点，如x.y.z.service.*,配置多个英文逗号分隔
	#如果spring.datasource.druid.aop-patterns要代理的类没有定义interface请设置spring.aop.proxy-target-class=true