springBoot添加自定义过滤器Filter

ゞ浴缸里的玫瑰 2022-03-08 10:14 368阅读 0赞

# 方式1 #

# 1.添加component注解 #

# 2.实现javax.servlet.Filter #

# 3.重写init，doFilter，destory方法 #

# 方式2 #

# 添加 #

# 1添加@webfilter注解、@Order(1)注解，可以设定过滤的路径 #

# @WebFilter(filterName = "\*\*",urlPatterns = \{"\*.html"\})   2.实现javax.servlet.Filter   3在启动类application上加注解@ServletComponentScan #

# @ServletComponentScan(basePackages = "com.zz.project") #

另外：如果我们的应用程序运行在一台负载均衡代理服务器后方，因此需要将代理服务器发来的请求包含的IP地址转换成真正的用户IP。Tomcat 8 提供了对应的过滤器：**RemoteIpFilter**。通过将RemoteFilter这个过滤器加入过滤器调用链即可使用它

@Configuration
    public class WebConfiguration {
    
        @Bean
        public RemoteIpFilter remoteIpFilter() {
            System.out.println("this is my RemoteIpFilter");
            return new RemoteIpFilter();
        }
    
        @Bean
        public FilterRegistrationBean filterRegistrationBean() {
            FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
            System.out.println("this is my FilterRegistrationBean");
            filterRegistrationBean.setFilter(new MyFilter());
            List<String> urlPatterns = new ArrayList<>();
            urlPatterns.add("/*");
            filterRegistrationBean.setUrlPatterns(urlPatterns);
            filterRegistrationBean.addInitParameter("paramName","paramValue");
            filterRegistrationBean.setName("MyFilter");
            filterRegistrationBean.setOrder(1);
            return filterRegistrationBean;
        }
    
        public class MyFilter implements Filter {
    
            @Override
            public void init(FilterConfig filterConfig) throws ServletException {
    
            }
    
            @Override
            public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
                HttpServletRequest httpServletRequest = (HttpServletRequest)servletRequest;
                System.out.println("this is MyFilter,url :" + httpServletRequest.getRequestURL());
                filterChain.doFilter(httpServletRequest,servletResponse);
            }
    
            @Override
            public void destroy() {
    
            }
        }
    }