springboot的拦截器和过滤器实现

• springboot拦截器

说明：和springmvc一样去实现HandlerInterceptor接口

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 〈一句话功能简述〉<br>
 * TODO(参数拦截器1)
 *
 * @author sunhan
 * @version 1.0.0
 * @since 2020/3/7 10:06 PM
 */
@Component
public class ParameterInterceptor1 implements HandlerInterceptor {


    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
                             Object handler) throws Exception {
        System.out.println("进入了拦截器-----11111");
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response,
                           Object handler, ModelAndView modelAndView) {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response,
                                Object handler, Exception ex) {

    }
}

把自定义拦截器注册到WebMvcConfigurer配置接口中：

重写addInterceptors方法，添加自定义拦截器的order，pathPatterns

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

/**
 * 〈一句话功能简述〉<br>
 * TODO()
 *
 * @author sunhan
 * @version 1.0.0
 * @since 2020/3/7 10:25 PM
 */
@Configuration
public class InterceptConfiguration implements WebMvcConfigurer {

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new ParameterInterceptor1()).addPathPatterns("/get*");
        registry.addInterceptor(new ParameterInterceptor2()).addPathPatterns("/save*");
    }
}

• springboot过滤器

说明：注解方式和注册方式

　　1、注解方式：

import org.springframework.core.annotation.Order;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;

/**
 * 〈一句话功能简述〉<br>
 * TODO()
 *
 * @author sunhan
 * @version 1.0.0
 * @since 2020/3/6 5:28 PM
 */
@WebFilter(filterName = "requestParamFilter",urlPatterns = "/*")
@Order(3)
public class RequestParamFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse,
                         FilterChain filterChain) throws IOException, ServletException {
        System.out.println("sunhan---请求参数过滤器！---test1");
        filterChain.doFilter(servletRequest,servletResponse);
    }

    @Override
    public void destroy() {

    }
}

　　注意：

　　1.1、注解方式需要@WebFilter和@Order放在Filter实现类上。

　　1.2、注解方式需要@ServletComponentScan放在SpringBootApplication启动类上

　　

　　2、注册方式：

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

public class MyFilter implements Filter {

    @Override
    public void init(FilterConfig arg0) throws ServletException {
    }

    @Override
    public void doFilter(ServletRequest srequest, ServletResponse sresponse, FilterChain filterChain)
            throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) srequest;
        System.out.println("this is MyFilter,url :"+request.getRequestURI());
        filterChain.doFilter(srequest, sresponse);
    }

    @Override
    public void destroy() {
    }

}

　　注意：@Bean放在一个方法中，然后通过springboot的FilterRegistrationBean注册到过滤链中

import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class WebConfiguration {

    @Bean
    public FilterRegistrationBean testFilterRegistration() {
        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setFilter(new MyFilter());
        registration.addUrlPatterns("/*");
        registration.setName("MyFilter");
        registration.setOrder(6);
        return registration;
    }

    @Bean
    public FilterRegistrationBean test2FilterRegistration() {
        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setFilter(new MyFilter2());
        registration.addUrlPatterns("/*");
        registration.setName("MyFilter2");
        registration.setOrder(1);
        return registration;
    }
}