（转）Spring Boot —— 自定义Filter

我们常常在项目中会使用filters用于录调用日志、排除有XSS威胁的字符、执行权限验证等等。Spring Boot自动添加了OrderedCharacterEncodingFilter和HiddenHttpMethodFilter，并且我们可以自定义Filter。

两个步骤：

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

好吧，直接上代码

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

        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setFilter(new MyFilter());
        registration.addUrlPatterns("/*");
        registration.addInitParameter("paramName", "paramValue");
        registration.setName("MyFilter");
        registration.setOrder(1);
        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 {
			// TODO Auto-generated method stub
			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
		}
    }
}

作者：纯洁的微笑
出处：www.ityouknow.com 
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