【Spring】定义过滤器Filter和拦截器Interceptor

 # 定义过滤器

package com.holen.filter;import jakarta.servlet.Filter;
import jakarta.servlet.FilterChain;
import jakarta.servlet.ServletException;
import jakarta.servlet.ServletRequest;
import jakarta.servlet.ServletResponse;
import java.io.IOException;public class MyFilter implements Filter {@Overridepublic void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {System.out.println("目标方法执行前的逻辑");chain.doFilter(request, response);System.out.println("目标方法执行完成后的逻辑");}@Overridepublic void destroy() {System.out.println("销毁逻辑，可选");}
}

# 注册过滤器（servlet版本：jakarta.servlet-api:6.0.0） 

package com.holen.filter;import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;@Configuration
public class FilterConfig {@Beanpublic FilterRegistrationBean<MyFilter> customFilterRegistration() {FilterRegistrationBean<MyFilter> registration = new FilterRegistrationBean<>();registration.setFilter(new MyFilter());registration.addUrlPatterns("/*");registration.setName("MyFilter");registration.setOrder(1);return registration;}
}

# 定义拦截器

package com.holen.Interceptor;import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;public class MyInterceptor implements HandlerInterceptor {@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {// 在请求到达目标方法之前执行的逻辑System.out.println("Executing custom interceptor before request is processed.");return true; // 返回 true 表示继续执行后续的拦截器或目标方法，返回 false 表示终止执行}@Overridepublic void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {// 在请求被发送回客户端之前或在目标方法执行完成后执行的逻辑System.out.println("Executing custom interceptor after request is processed.");}@Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {// 请求完成后的清理逻辑}
}

# 注册拦截器

package com.holen.Interceptor;import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;@Configuration
public class WebMvcConfig implements WebMvcConfigurer {@Overridepublic void addInterceptors(InterceptorRegistry registry) {registry.addInterceptor(new MyInterceptor()).addPathPatterns("/**"); // 可以添加拦截的路径模式}
}