spring 常用注解

AOP

@Aspect
@Component
public class LogAspect {

    @Pointcut("@annotation(com.sys.aop.point)") // point 自定义注解
    public void annotationPointCut(){};
    
    @After("annotationPointCut()")
    public void after(JoinPoint joinPoint) {
        MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature();
        Method method = methodSignature.getMethod();
        Point action = method.getAnnotation(Point.class);
        System.out.println(action.name());
    }
    
    //@Before("execution(*com.sys.aop.DemoService.*(..))")
}

aware

public class AwareService implements BeanNameAware, ResourceLoaderAware{

    private String beanName;
    private ResourceLoader loader;
    @Override
    public void setResourceLoader(ResourceLoader resourceLoader) {
        this.loader = resourceLoader;
    }

    @Override
    public void setBeanName(String name) {
        this.beanName = name;
    }
    
    public void outputResult() {
        System.out.println("Bean 的名称为:"+beanName);
        
        Resource resource = loader.getResource("classpath:com/sys/a.txt");
        try {
            System.out.println(IOUtils.toString(resource.getInputStream()));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

多线程

@Configuration
@EnableAsync
public class TaskExecutorConfig implements AsyncConfigurer{

    @Override
    public Executor getAsyncExecutor() {
        ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
        taskExecutor.setCorePoolSize(5);
        taskExecutor.setMaxPoolSize(10);
        taskExecutor.setQueueCapacity(25);
        taskExecutor.initialize();
        return taskExecutor;
    }

    @Override
    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
        return null;
    }

}

@Service
public class AsyncService {
    
    @Async
    public void executeAsync() {

    }
    
    
    @Async
    public void executeAsyncPlus() {
        
    }
}

计划任务

@Service
@EnableScheduling
public class ScheduleTaskService {

    private static final SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("HH:mm:ss");
    
    @Scheduled(fixedRate = 5000)
    public void reportCurrentTime() {
        System.out.println("每隔5秒执行一次");
    }
    
    //@Scheduled(cron = "0 28 11 ? * *") 每天11点28执行  
}


//再在配置类上加上 @EnbleScheduling

条件注解@Conditional

实现Condition接口，实现matches方法 返回boolean值

@Enable*注解的原理

@Target(value = {ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Import(value = {FirstFilterConfiguration.class})
public @interface EnableFirstFilter {

}

过滤器
public class FirstFilterConfiguration {

    public static final Integer ORDER = Integer.MIN_VALUE;    
    
    @Bean
    public FilterRegistrationBean firstFilter(){
        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setFilter(new FirstFilter());
        registration.addUrlPatterns("/*");
        registration.setName("firstFilter");
        registration.setOrder(ORDER);
        return registration;
    }
}

@Target(value = {ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Import(value = {TokenPropery.class, AuthenticationIgnoreProperty.class, ClientKeyPropery.class})
@EnableConfigurationProperties(value= {PagesAccessPropery.class})
public @interface EnableProperties {

}

@RequestingMapping(value={"/obj",  "/obj2"}, produces = "application/json;charset=UTF-8")

webMVC  及拦截器的配置

@Configuration
@EnableWebMvc
public class MyMvcConfig extends WebMvcConfigurerAdapter{
    
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/asserts/**").addResourceLocations("classpath:/asserts/");
    }
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new HandlerInterceptor() {
            
            @Override
            public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
                    throws Exception {
                // TODO Auto-generated method stub
                return false;
            }
            
            @Override
            public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
                    ModelAndView modelAndView) throws Exception {
                // TODO Auto-generated method stub
                
            }
            
            @Override
            public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
                    throws Exception {
                // TODO Auto-generated method stub
                
            }
        });
    }
}

@ControllerAdvice
public class ExceptionHandlerAdvice {
    
    @ExceptionHandler(value = Exception.class)
    public ModelAndView exception(Exception e) {
        ModelAndView modelAndView = new ModelAndView("error");
        modelAndView.addObject("error", e.getMessage());
        return modelAndView;
    }
    
    @ModelAttribute  将此信息放入全局
    public void addAttributes(Model model) {
        model.addAttribute("msg","ewaixinxi");
    }
    
    @InitBinder
    public void initBinder(WebDataBinder webDataBinder){
        webDataBinder.setDisallowedFields("id");
    }
}

spring boot

@SpringBootApplication   包含了

@EnableAutoConfiguration
@ComponentScan  注解

对于application.properties的属性注入

@ConfigurationProperties(prefix=“前缀”) 加载文件的位置 @value

spring.profiles.active=设定活动的properties

springboot 运行原理

java - jar **.jar --debug    或者application.properties debug=true

@SpringBootApplication的注解上@EnableAutoConfiguration 引入了EnableAutoConfigurationImportSelector.class

    protected List<String> getCandidateConfigurations(AnnotationMetadata metadata,
            AnnotationAttributes attributes) {
        List<String> configurations = SpringFactoriesLoader.loadFactoryNames(
                getSpringFactoriesLoaderFactoryClass(), getBeanClassLoader());  
        Assert.notEmpty(configurations,
                "No auto configuration classes found in META-INF/spring.factories. If you "
                        + "are using a custom packaging, make sure that file is correct.");
        return configurations;
    }

对META——INF/spring.factories下的文件扫描需要加载配置的类

@ConfigurationProperties(prefix="")

@EnableConfigurationProperties(配置类)   声明后，再通过@autowried注入
@ConditionalOnProperty(prefix="", value="enabled",matchMissing=true)

替换使用jetty

      <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-web</artifactId>
          <exclusions>
              <exclusion>
                  <groupId>org.springframework.boot</groupId>
                  <artifactId>spring-boot-starter-tomcat</artifactId>
              </exclusion>
          </exclusions>
      </dependency>
      <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-jetty</artifactId>
      </dependency>