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SpringBoot注册Filter的方法有哪些


SpringBoot注册Filter的方法有哪些

发布时间:2020-08-10 11:14:25 来源:高防服务器网 阅读:160 作者:小新 栏目:开发技术

小编给大家分享一下SpringBoot注册Filter的方法有哪些,希望大家阅读完这篇文章后大所收获,下面让我们一起去探讨吧!

springboot版本:2.2.5

一、filter注册

springboot中添加filter有两种方式:

1、实现方法一

package com.example.demo.filter1;    import java.io.IOException;    import javax.servlet.Filter;  import javax.servlet.FilterChain;  import javax.servlet.FilterConfig;  import javax.servlet.ServletException;  import javax.servlet.ServletRequest;  import javax.servlet.ServletResponse;    import org.springframework.stereotype.Component;    /**   * Springboot实现filter的方式一:   * 实现Filter接口,并使用@Component注解   * 需要注意的是:这个方式注册的filter的执行顺序优先级较低   * @author Administrator   *   */  @Component  public class FilterSample1 implements Filter {      @Override    public void init(FilterConfig filterConfig) throws ServletException {      System.out.println("这里是"+this.getClass().getName()+"的init");          }      @Override    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)        throws IOException, ServletException {      System.out.println("这里是"+this.getClass().getName()+"的doFilter");      chain.doFilter(request,response);    }      @Override    public void destroy() {      System.out.println("这里是"+this.getClass().getName()+"的doFilter");          }  }

2、实现方法二

package com.example.demo.filter2;    import java.io.IOException;    import javax.servlet.Filter;  import javax.servlet.FilterChain;  import javax.servlet.ServletException;  import javax.servlet.ServletRequest;  import javax.servlet.ServletResponse;    public class FilterSample2 implements Filter{      @Override    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)        throws IOException, ServletException {      System.out.println("这里是"+this.getClass().getName()+"的doFilter");      chain.doFilter(request,response);          }  }
package com.example.demo.filter2;    import java.util.ArrayList;    import org.springframework.boot.web.servlet.FilterRegistrationBean;  import org.springframework.context.annotation.Bean;  import org.springframework.context.annotation.Configuration;    /**   * Springboot注册filter方法二:   * 同样要实现filter接口,但filter注册使用@Bean的方式进行注册,可以设置filter顺序   * @author Administrator   *   */  @Configuration  public class WebConfig {    @Bean    public FilterRegistrationBean<FilterSample2> filterSample2() {      FilterRegistrationBean<FilterSample2> registrationBean = new FilterRegistrationBean<FilterSample2>();      FilterSample2 myFilter = new FilterSample2();      registrationBean.setFilter(myFilter);      ArrayList<String> urls = new ArrayList<>();      urls.add("/*");//配置过滤规则      registrationBean.setUrlPatterns(urls);      registrationBean.setOrder(3);      return registrationBean;    }  }

二、Springboot自带filter

Springboot默认启用了三个filter,他们是requestContextFilter,characterEncodingFilter,formContentFilter,可以通过在application.yml中设置debug: true来验证如下:

2020-03-17 22:13:17.254 DEBUG 2700 — [           main] o.s.b.w.s.f.OrderedRequestContextFilter  : Filter 'requestContextFilter' configured for use
2020-03-17 22:13:17.255 DEBUG 2700 — [           main] s.b.w.s.f.OrderedCharacterEncodingFilter : Filter 'characterEncodingFilter' configured for use
2020-03-17 22:13:17.255 DEBUG 2700 — [           main] o.s.b.w.s.f.OrderedFormContentFilter     : Filter 'formContentFilter' configured for use

三、查看应用中注册了哪些filter

#application.yml  debug: true

如上图,启用debug模式,查看日志可得:

标蓝部分详细内容如下:

2020-03-17 22:13:17.244 DEBUG 2700 — [           main] o.s.b.w.s.ServletContextInitializerBeans :
Mapping filters:
filterRegistrationBean urls=[/*] order=3,
characterEncodingFilter urls=[/*] order=-2147483648,
formContentFilter urls=[/*] order=-9900,
requestContextFilter urls=[/*] order=-105,
filterSample1 urls=[/*] order=2147483647

可以看出,该应用注册了五个filter,执行顺序由order决定

看完了这篇文章,相信你对SpringBoot注册Filter的方法有哪些有了一定的了解,想了解更多相关知识,欢迎关注高防服务器网行业资讯频道,感谢各位的阅读!

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