SpringBoot 拦截器

最新推荐文章于 2023-07-01 17:30:56 发布

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本文详细介绍如何在SpringBoot中自定义Filter，包括实现Filter接口、配置Filter注册Bean及设置过滤路径、初始化参数和优先级。通过实战示例，展示自定义Filter在请求处理过程中的作用。

1. 自定义Filter

pring Boot自动添加了OrderedCharacterEncodingFilter和HiddenHttpMethodFilter，并且我们可以自定义Filter。

从输出日志可以看到默认添加的Filter

两个步骤：

实现Filter接口，实现Filter方法
添加@Configuration 注解，将自定义Filter加入过滤链

代码 :

@Configuration
public class WebConfiguration {
    @Bean
    public RemoteIpFilter remoteIpFilter() {
        return new RemoteIpFilter();
    }
    
    @Bean
    public FilterRegistrationBean testFilterRegistration() {

        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setFilter(new MyFilter());//添加过滤器
        registration.addUrlPatterns("/*");//设置过滤路径，/*所有路径
        registration.addInitParameter("name", "wcb");registration.setinitParameter("age",26);//添加默认参数
       registration.setOrder(1);//设置优先级
        return registration;
    }
    
    public class MyFilter implements Filter {
		@Override
		public void destroy() {
			// TODO Auto-generated method stub
		}

		@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 init(FilterConfig arg0) throws ServletException {
			// TODO Auto-generated method stub
		}
    }
}//添加过滤器
        registration.addUrlPatterns("/*");//设置过滤路径，/*所有路径
        registration.addInitParameter("name", "wcb");registration.setinitParameter("age",26);//添加默认参数
       registration.setOrder(1);//设置优先级
        return registration;
    }
    
    public class MyFilter implements Filter {
		@Override
		public void destroy() {
			// TODO Auto-generated method stub
		}

		@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 init(FilterConfig arg0) throws ServletException {
			// TODO Auto-generated method stub
		}
    }
}

@RestController
public class TestController {
	@Autowired
	private FilterRegistrationBean filterRegistrationBean;
	@RequestMapping("/test")
	public Map<String, String> test() {
		return filterRegistrationBean.getInitParameters();
	}
}

访问http://localhost:8080/test 可以看到,页面结果如下