spring mvc配置拦截器Interceptor和Filter

缺乏、安全感 2021-11-11 12:08 270阅读 0赞

### spring mvc配置拦截器 ###

*  编写拦截器
 *  配置使拦截器生效
 *  配置Filter
 *   *  方法一：@WebFilter
     *  方法二：FilterRegistrationBean

# 编写拦截器 #

public class DemoInterceptor extends HandlerInterceptorAdapter { 
    	@Override
    	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
    			throws Exception { 
    		System.err.println("拦截前 do something !");
    		return true;
    	}
    	@Override
    	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
    			ModelAndView modelAndView) throws Exception { 
    		System.err.println("----------拦截后 do something !");
    	}
    }

# 配置使拦截器生效 #

@Configuration
    @EnableWebMvc
    @ComponentScan({ "com.sky.springmvctest"})
    public class SpringMvcConfig extends WebMvcConfigurerAdapter { 
    	@Bean
    	public DemoInterceptor demoInterceptor() { 
    		return new DemoInterceptor();
    	}
    	@Override
    	public void addInterceptors(InterceptorRegistry registry) { 
    		registry.addInterceptor(demoInterceptor());
    	}
    }

注意：访问静态资源不拦截

拦截前 do something !
    index
    ----------拦截后 do something !

# 配置Filter #

spring mvc配合Filter使用有两种方式

## 方法一：@WebFilter ##

缺点：不能指定Filter的执行顺序

import javax.servlet.*;
    import javax.servlet.annotation.*;
    import javax.servlet.http.*;
    @WebFilter(filterName = "myFilter", urlPatterns = "/*")
    public class MyFilter implements Filter { 
        public void doFilter(ServletRequest req, ServletResponse response, FilterChain chain) throws IOException, ServletException { 
            HttpServletRequest request = (HttpServletRequest) req;
    		String requestURI = request.getRequestURI();
    		System.err.println("myFilter_uri:" + requestURI);
    		chain.doFilter(request, response);
        }
    }

## 方法二：FilterRegistrationBean ##

import javax.servlet.*;
    import javax.servlet.annotation.*;
    import javax.servlet.http.*;
    public class MyFilter2 implements Filter { 
        public void doFilter(ServletRequest req, ServletResponse response, FilterChain chain) throws IOException, ServletException { 
            HttpServletRequest request = (HttpServletRequest) req;
    		String requestURI = request.getRequestURI();
    		System.err.println("myFilter2_uri:" + requestURI);
    		chain.doFilter(request, response);
        }
    }

@Configuration
    public class MyWebConfig implements WebMvcConfigurer { 
        @Bean
        public FilterRegistrationBean<MyFilter2 > filterRegistration() { 
        	FilterRegistrationBean<MyFilter2 > registration = new FilterRegistrationBean<>();
        	registration.setFilter(new MyFilter2 ());
        	registration.addUrlPatterns("/*");
        	registration.setName("myFilter2");
        	registration.setOrder(1);
        	return registration;
        }
    }