SpringBoot自定義過濾器filter

主要有兩種方式：

一、第一種

步驟：（1）先建立自定義filter

  DefaultFilter 為本人建立的自定義過濾器。

public class DefaultFilter implements Filter{
	
	private Logger logger = LoggerFactory.getLogger(DefaultFilter.class);
	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {
		
		logger.info("Default filter!!!");
		chain.doFilter(request, response);
	}

	@Override
	public void destroy() {
		// TODO Auto-generated method stub
		
	}

}
           

（2)  将自定義過濾器添加到容器中

@Configuration
public class FilterConfig {

	/**
	 * 添加自定義 filter
	 * 
	 */
	@Bean
	public FilterRegistrationBean<Filter> defaultFilter(){
		FilterRegistrationBean<Filter> registerFilter = new FilterRegistrationBean<Filter>();
		registerFilter.setFilter(new DefaultFilter()); //添加自定義過濾器
		registerFilter.addUrlPatterns("/*"); //添加過濾規則
		registerFilter.setName("DefaultFilterOne");
		registerFilter.addInitParameter("key", "value");
		registerFilter.setOrder(1);
		
		return registerFilter;
	}
}
           

二、第二種

           步驟（1）：建立自定義過濾器，并在自定義過濾器添加 @WebFilter 注解，并且配置相關參數, @Order(1)表示執行順序，值越小，越先執行

/*
 * @Order(1)表示執行順序，值越小，越先執行
 * urlPatterns 為過濾規則
 * filterName 過濾器名稱
 * WebFilter 還有其他參數，可自行設定
 */
@Order(1)
@WebFilter(filterName="secondfilter",urlPatterns="/*")
public class SecondFilter implements Filter {

	private Logger logger = LoggerFactory.getLogger(SecondFilter.class);
	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
		// TODO Auto-generated method stub

	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {
		
		logger.info("SecondFilter!!!");
		chain.doFilter(request, response);

	}

	@Override
	public void destroy() {
		// TODO Auto-generated method stub

	}

}
           

（2）在啟動類添加注解 @ServletComponentScan

@SpringBootApplication(scanBasePackages="com.test")
@ServletComponentScan
public class MongoOperateApplication {

	public static void main(String[] args) {
		SpringApplication.run(MongoOperateApplication.class, args);
	}
	
}
           

完成，進行測試