8.spring_boot druid

八、spring_boot 整合 druid

1. 在pom.xml文件加入

   <!-- druid 连接池 -->
   <dependency>
   	<groupId>com.alibaba</groupId>
   	<artifactId>druid</artifactId>
   	<version>1.0.18</version>
   </dependency>	
   

2. 新增druid.properties配置文件

   spring.datasource.druid.initialSize=5
   spring.datasource.druid.minIdle=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 
   spring.datasource.druid.testWhileIdle=true
   spring.datasource.druid.testOnBorrow=false
   spring.datasource.druid.testOnReturn=false
   spring.datasource.druid.filters=stat,wall,log4j 
   spring.datasource.druid.logSlowSql=true
   

3. 添加druid配置类

   
   /**
    * 数据库连接池配置
    *
    * @author chair
    */
   @Configuration
   @MapperScan("com.jkoss.examination.*.mapper")
   public class MybatisConfig {
   
   	private Logger logger = LoggerFactory.getLogger(MybatisConfig.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.driver-class-name}")
   	private String driverClassName;
   
   	@Value("${spring.datasource.druid.initialSize}")
   	private int initialSize;
   
   	@Value("${spring.datasource.druid.minIdle}")
   	private int minIdle;
   
   	@Value("${spring.datasource.druid.maxActive}")
   	private int maxActive;
   
   	@Value("${spring.datasource.druid.maxWait}")
   	private int maxWait;
   
   	@Value("${spring.datasource.druid.timeBetweenEvictionRunsMillis}")
   	private int timeBetweenEvictionRunsMillis;
   
   	@Value("${spring.datasource.druid.minEvictableIdleTimeMillis}")
   	private int minEvictableIdleTimeMillis;
   
   	@Value("${spring.datasource.druid.validationQuery}")
   	private String validationQuery;
   
   	@Value("${spring.datasource.druid.testWhileIdle}")
   	private boolean testWhileIdle;
   
   	@Value("${spring.datasource.druid.testOnBorrow}")
   	private boolean testOnBorrow;
   
   	@Value("${spring.datasource.druid.testOnReturn}")
   	private boolean testOnReturn;
   
   	@Value("${spring.datasource.druid.filters}")
   	private String filters;
   
   	@Value("${spring.datasource.druid.logSlowSql}")
   	private String logSlowSql;
   
   	/**
   	 * 数据库连接池
   	 *
   	 * @return
   	 */
   	@Bean("druidDataSource")
   	public DataSource druidDataSource() {
   		DruidDataSource datasource = new DruidDataSource();
   		datasource.setUrl(dbUrl);
   		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);
   		try {
   			datasource.setFilters(filters);
   		} catch (SQLException e) {
   			logger.error("druid configuration initialization filter", e);
   		}
   		return datasource;
   	}
    
   }
   

4. 添加druid监控

   /**
    * 访问druid监控信息servlet
    * 
    * @return
    */
   @Bean
   public ServletRegistrationBean druidServletRegistration() {
   	ServletRegistrationBean registration = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
   	// 添加初始化参数：initParams
   
   	// 白名单：
   	registration.addInitParameter("allow", "127.0.0.1");
   	// IP黑名单 (存在共同时，deny优先于allow) : 如果满足deny的话提示:Sorry, you are not
   	// permitted to view this page.
   	registration.addInitParameter("deny", "");
   	// 登录查看信息的账号密码.
   	registration.addInitParameter("loginUsername", "admin");
   	registration.addInitParameter("loginPassword", "admin");
   	// 是否能够重置数据.
   	registration.addInitParameter("resetEnable", "false");
   	return registration;
   }
   
   /**
    * 过滤druid
    * 
    * @return
    */
   @Bean
   public FilterRegistrationBean druidStatFilter() {
   	FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());
   
   	// 添加过滤规则.
   	filterRegistrationBean.addUrlPatterns("/*");
   
   	// 添加不需要忽略的格式信息.
   	filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
   	return filterRegistrationBean;
   }
   

5. 如果需要添加事务新增事务配置文件

   /**
    * 事务拦截器
    *
    * @author chair
    */
   @Configuration
   public class TransactionAopConfig {
   
       /**
        * 事务拦截器
        */
       @Bean("txInterceptor")
       TransactionInterceptor getTransactionInterceptor(PlatformTransactionManager tx) {
           return new TransactionInterceptor(tx, transactionAttributeSource());
       }
   
       /**
        * 切面拦截规则 参数会自动从容器中注入
        */
       @Bean
       public AspectJExpressionPointcutAdvisor pointcutAdvisor(TransactionInterceptor txInterceptor) {
           AspectJExpressionPointcutAdvisor pointcutAdvisor = new AspectJExpressionPointcutAdvisor();
           pointcutAdvisor.setAdvice(txInterceptor);
           pointcutAdvisor.setExpression("execution (* com.jkoss.wine.*.service.*.*(..))");
           return pointcutAdvisor;
       }
   
       /**
        * 事务拦截类型
        */
       @Bean("txSource")
       public TransactionAttributeSource transactionAttributeSource() {
           NameMatchTransactionAttributeSource source = new NameMatchTransactionAttributeSource();
           /* 只读事务，不做更新操作 */
           RuleBasedTransactionAttribute readOnlyTx = new RuleBasedTransactionAttribute();
           readOnlyTx.setReadOnly(true);
           readOnlyTx.setPropagationBehavior(TransactionDefinition.PROPAGATION_NOT_SUPPORTED);
           /* 当前存在事务就使用当前事务，当前不存在事务就创建一个新的事务 */
           RuleBasedTransactionAttribute requiredTx = new RuleBasedTransactionAttribute();
           requiredTx.setRollbackRules(Collections.singletonList(new RollbackRuleAttribute(Exception.class)));
           requiredTx.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRED);
           // requiredTx.setTimeout(5);
           Map<String, TransactionAttribute> txMap = new HashMap<>();
           txMap.put("insert*", requiredTx);
           txMap.put("update*", requiredTx);
           txMap.put("delete*", requiredTx);
           txMap.put("batch*", requiredTx);
           txMap.put("select*", readOnlyTx);
           source.set	NameMap(txMap);
           return source;
       }
   
   }