SringBoot拦截器和aop自定义过滤实现

一、SringBoot拦截器定义和springmve类似

配置拦截器也很简单，Spring 为什么提供了基础类WebMvcConfigurerAdapter ，我们只需要重写 addInterceptors 方法添加注册拦截器。

实现自定义拦截器只需要3步：
1、创建我们自己的拦截器类并实现 HandlerInterceptor 接口。
2、创建一个Java类继承WebMvcConfigurerAdapter，并重写 addInterceptors 方法。
2、实例化我们自定义的拦截器，然后将对像手动添加到拦截器链中（在addInterceptors方法中添加）。

1.首先定义拦截器

[java]@Component("myInterceptor1")
public class MyInterceptor1 implements HandlerInterceptor {

@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
System.out.println(">>>MyInterceptor1>>>>>>>在请求处理之前进行调用（Controller方法调用之前）");

return true;// 只有返回true才会继续向下执行，返回false取消当前请求
}

@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
ModelAndView modelAndView) throws Exception {
System.out.println(">>>MyInterceptor1>>>>>>>请求处理之后进行调用，但是在视图被渲染之前（Controller方法调用之后）");
}

@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
throws Exception {
System.out.println(">>>MyInterceptor1>>>>>>>在整个请求结束之后被调用，也就是在DispatcherServlet 渲染了对应的视图之后执行（主要是用于进行资源清理工作）");
}

}[/java]

2.定义类继承WebMvcConfigurerAdapter,添加拦截器

[java]@Configuration
public class MyWebAppConfigurer extends WebMvcConfigurerAdapter {
@Autowired
private MyInterceptor1 myInterceptor1;
@Override
public void addInterceptors(InterceptorRegistry registry) {
// 多个拦截器组成一个拦截器链
// addPathPatterns 用于添加拦截规则
// excludePathPatterns 用户排除拦截
registry.addInterceptor(myInterceptor1).addPathPatterns("/**");
//registry.addInterceptor(new MyInterceptor2()).addPathPatterns("/**");
super.addInterceptors(registry);
}
}[/java]

二、Springboot中aop技术应用

[java]@Aspect
@Component
public class HttpAspect {

private final static Logger logger = LoggerFactory.getLogger(HttpAspect.class);

@Pointcut("execution(public * com.ittx.java1608.springbootdemo1.controller.*.*(..))")
public void log() {
}

@Before("log()")
public void doBefore(JoinPoint joinPoint) {
ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
HttpServletRequest request = attributes.getRequest();

//url
logger.info("url={}", request.getRequestURL());

//method
logger.info("method={}", request.getMethod());

//ip
logger.info("ip={}", request.getRemoteAddr());

//类方法
logger.info("class_method={}", joinPoint.getSignature().getDeclaringTypeName() + "." + joinPoint.getSignature().getName());

//参数
logger.info("args={}", joinPoint.getArgs());
}

@After("log()")
public void doAfter() {
logger.info("doAfter 222222222222");
}

@AfterReturning(returning = "object", pointcut = "log()")
public void doAfterReturning(Object object) {
logger.info("response={}", object.toString());
}

}[/java]

2.记得在pom.xml中引入aop依赖
[java]<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>[/java]

转载请注明来源：SringBoot拦截器和aop自定义过滤实现

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