Springboot中使用监听器

@Slf4j
public class MyListener implements ServletContextListener {
​
  @Override
  public void contextInitialized(ServletContextEvent sce) {
    log.info("web项目的启动{}   一开始就启动",sce.getServletContext());
    System.err.println("web项目的启动{}");
  }
​
  @Override
  public void contextDestroyed(ServletContextEvent sce) {
    log.info("web项目的关闭{}.........................");
    System.err.println("web项目的关闭{}............................");
  }
}
​
把监听器给springboot
@Configuration
public class ListenerConfig {
  @Bean
  public ServletListenerRegistrationBean myListener() {
    ServletListenerRegistrationBean<MyListener> registrationBean = new
      ServletListenerRegistrationBean<>(new MyListener());
    return registrationBean;
  }
}
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@WebListener
@Component
public class LoginListener implements ServletRequestListener {
​
    @Override
    public void requestInitialized(ServletRequestEvent servletRequestEvent) {
        System.out.println("---------------------------->请求创建");
    }
    @Override
    public void requestDestroyed(ServletRequestEvent servletRequestEvent) {
        System.out.println("---------------------------->请求销毁");
    }
}
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@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
public @interface OperationLog {
    String[] value();
}
​
//枚举类
public enum OperateType {
    OPERATE_TYPE_1(1, "添加"),
    OPERATE_TYPE_2(2, "修改"),
    OPERATE_TYPE_3(3, "删除"),
    OPERATE_TYPE_4(4, "查询"),
    OPERATE_TYPE_5(5, "停用/启用"),
    OPERATE_TYPE_6(6, "发布"),
    OPERATE_TYPE_7(7, "上传"),
    OPERATE_TYPE_8(8, "导入"),
    OPERATE_TYPE_9(9, "导出"),
    OPERATE_TYPE_10(10, "作废"),
    OPERATE_TYPE_11(11, "排序");
​
    private Integer no;
    private String name;
​
    OperateType(Integer no, String name) {
        this.no = no;
        this.name = name;
    }
​
​
    public static Integer getNo(String name) {
        for (OperateType o : OperateType.values()) {
            if (o.getName().equals(name)) {
                return o.getNo();
            }
        }
        return null;
    }
​
    public Integer getNo() {
        return no;
    }
​
    public void setNo(Integer no) {
        this.no = no;
    }
​
    public String getName() {
        return name;
    }
​
    public void setName(String name) {
        this.name = name;
    }
}
​
//切面类的方法
@Aspect
@Component
public class OperationLogAspect {
​
    @Autowired
    private JdOperateLogService logService;
​
    @Pointcut("@annotation(OperationLog)")
    public void dbPointCut() {
​
    }
​
    @Before("dbPointCut()")
    public void beforeSwitchDS(JoinPoint point){
        // 获得当前访问的class
        Class<?> className = point.getTarget().getClass();
        // 获得访问的方法名
        String methodName = point.getSignature().getName();
        // 得到方法的参数的类型
        Class[] argClass = ((MethodSignature)point.getSignature()).getParameterTypes();
        // 获取IP
        HttpServletRequest request = ( (ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getRequest();
        String ip = request.getRemoteHost();
        String[] operation;
        try {
            // 得到访问的方法对象
            Method method = className.getMethod(methodName, argClass);
            // 判断是否存在@OperationLog注解
            if (method.isAnnotationPresent(OperationLog.class)) {
                OperationLog annotation = method.getAnnotation(OperationLog.class);
                // 取出注解中的信息
                operation = annotation.value();
                if (operation.length != 3) {
                    return;
                } else {
                    logService.addOperateLog(ip, operation[0], Long.parseLong(OperateType.getNo(operation[1]).toString()),operation[2]);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    @After("dbPointCut()")
    public void afterSwitchDS(JoinPoint point){
        // 操作结束
    }
}
​
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<dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-cache</artifactId>
</dependency>
二、 @EnableCaching开启缓存//@MapperScan(basePackages = {"com.wang.cache.dao"})  
@SpringBootApplication
@EnableCaching  // 开启缓存注解
public class SpringbootCacheApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringbootCacheApplication.class, args);
    }
@Service
@Transactional(readOnly = true)
public class IndexService {
​
  @Autowired
  private IndexMapper indexMapper;
​
  /**
   * 将方法的运行结果进行缓存，以后要相同的数据就直接获取
   * CstcheManage 管理多个catche组件，每个缓存组件都有一个唯一的名字
   * <p>
   * 几个属性：
   * catcheManage/value:指定缓存组件的名字
   * key:缓存数据使用的key 默认是方法的参数的值   key id=1 ,value 方法的返回值
   * 也可以使用Espl表达式来使用
   * <p>
   * keyGenerator:key生成器，可以自己指定key的生成器的组件id   key/keyGenerator二者选一
   * <p>
   * catcheManage：指定缓存管理器，或者catchResolve指定获取解析器
   * condition：指定符合条件的情况下菜缓存  指定条件  "#id>1"
   * unless:否定缓存，当unless指定的条件为true 方法的返回值就不会被缓存；可以获取结果进行判断  unless="#result"==null
   * sync：是否使用异步模式
   *
   *
   * @return
   */
​
  @Cacheable(cacheNames = "indexMapper.getAll()",condition = "#")
  public List<Index> getAll() {
    return indexMapper.getAll();
  }
}
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