1. 自定義Filter

pring Boot自動添加了OrderedCharacterEncodingFilter和HiddenHttpMethodFilter，並且我們可以自定義Filter。

從輸出日誌可以看到預設新增的Filter

兩個步驟：

1. 實現Filter介面，實現Filter方法
2. 新增@Configuration 註解，將自定義Filter加入過濾鏈

程式碼 :

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

        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setFilter(new MyFilter());//新增過濾器
 

        registration.addUrlPatterns("/*");//設定過濾路徑，/*所有路徑
        registration.addInitParameter("name", "wcb");registration.setinitParameter("age",26);//新增預設引數
       registration.setOrder(1);//設定優先順序
        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
		}
    }
}
 
//新增過濾器
        registration.addUrlPatterns("/*");//設定過濾路徑，/*所有路徑
        registration.addInitParameter("name", "wcb");registration.setinitParameter("age",26);//新增預設引數
       registration.setOrder(1);//設定優先順序
        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();
	}
}

訪問http://localhost:8080/test 可以看到,頁面結果如下

再看控制檯輸出日誌,可見自定義的攔截器也有攔截並輸出內容