AOP/Spring AOP/Filter/Interceptor

AOP

AOP, face-oriented programming, is a programming idea.

Common AOP technology in Java

There are two filters and a proxy mode (also called filters and interceptors), and Filter is based on a callback function.
 The proxy mode is based on Java reflection technology.
 The proxy mode is divided into static proxy and dynamic proxy. Dynamic proxy is a simple implementation of interceptor.

Spring AOP

Spring AOP, an implementation of AOP, uses a proxy mode.

Filter

Filter (filter) is the specification of J2EE, and Servlet 2.3 began to introduce/implement the responsibility chain mode. Filter can be used to set character sets, control permissions, control steering, and more. Filter is also an implementation of AOP.

Interceptor

Interceptor is the concept in Struct2. The same is an implementation of AOP.

Filter and Interceptor contact and difference

1. The interceptor is a java-based reflection mechanism that uses proxy mode, and the filter is based on function callbacks.
 2. The interceptor does not depend on the servlet container, which depends on the servlet container.
 3. Interceptors can only work on actions, and filters can work on almost all requests (you can protect resources).
 4. The interceptor can access the action context, the object inside the stack, and the filter is not.

 5. Execution order: before filtering - intercepting money - Action processing - after interception - after filtering.

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