|
filter |
interceptor |
aspect |
| 入参 |
ServletRequest, ServletResponse |
HttpServletRequest , HttpServletResponse , Object handler |
ProceedingJoinPoint |
| 原理 |
依赖于servlet容器，与框架无关 |
Spring框架拦截器，基于Java反射机制 |
动态代理（jdk动态代理/cglib） |
| 范围 |
RESTful api |
RESTful api |
Spring Bean |
- 顺序：Filter -> Interceptor -> ControllerAdvie -> Aspect -> Controller -> Aspect -> ControllerAdvie -> Interceptor -> Filter
*ps: ControllerAdvie 是controller的增强，和ExceptionHandler一起用来做全局异常。
Interceptor
- 继承HandlerInterceptorAdapter（是HandlerInterceptor接口的实现类，有默认的空实现，可以自由选择自己需要的method去实现）
public class MyInterceptor extends HandlerInterceptorAdapter{
@Override
//如果preHandle返回false，这个url请求的controller方法不会进去（被拦截）
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
return false;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
}
- SpringBoot 项目:
继承WebMvcConfigurerAdapter（是WebMvcConfigurer接口的实现类），加@Configuration注解，引入写好的Interceptor，调用addInterceptors方法。
@Configuration
public class WebConfigurer extends WebMvcConfigurerAdapter {
@Autowired
private MyInterceptor myInterceptor;
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(myInterceptor)
.addPathPatterns("/url1/**", "/url2/**")
.excludePathPatterns("/url1/exclude");
}
super.addInterceptors(registry);
}
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/url/**" />
<bean class="path.MyInterceptor" />
</mvc:interceptor>
</mvc:interceptors>
AOP
- 用法
@Aspect @Component @Pointcut @Around @Before...
@Component
@Aspect
public class MyAspect {
@Pointcut("execution(public * com.citi..controller..*Controller.*(..) ) && @annotation(org.springframework.web.bind.annotation.RequestMapping)")
public void pointcut() {
}
@Around("pointcut()")
public Object function(ProceedingJoinPoint joinPoint) throws Throwable {
// do something
// 获取增强的类
// 获取增强的方法名
// 获取增强方法的参数
return joinPoint.proceed(); //继续执行被拦截方法
}
}
Filter
- 用法
实现Filter接口，或继承其实现类
(eg: GenericFilterBean -> OncePerRequestFilter -> AbstractRequestLoggingFilter)
@Component
public class MyFilter implements Filter {
private Logger logger = LoggerFactory.getLogger(getClass());
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
// do something
chain.doFilter(request, response); //继续执行
}
@Override
public void destroy() {
}
