spring boot过滤器FilterRegistrationBean实现方式

Z时代
2024-01-10
分类：综合

有2种方式可以实现过滤器

1：通过FilterRegistrationBean实例注册

2：通过@WebFilter注解生效

这里选择第一种，因为第二种不能设置过滤器之间的优先级

为了演示优先级，这里创建2个测试过滤器类：Test1Filter、Test2Filter

通过实现javax.servlet.Filter接口，覆盖其doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)方法，决定拦截或放行


public class Test1Filter implements Filter {
  @Override
  public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
      throws IOException, ServletException {
    // TODO Auto-generated method stub
    HttpServletRequest request=(HttpServletRequest)arg0;
    System.out.println("自定义过滤器filter1触发,拦截url:"+request.getRequestURI());
    arg2.doFilter(arg0,arg1);
  }
}


public class Test2Filter implements Filter {
  @Override
  public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
      throws IOException, ServletException {
    // TODO Auto-generated method stub
    HttpServletRequest request=(HttpServletRequest)arg0;
    System.out.println("自定义过滤器filter2触发,拦截url:"+request.getRequestURI());
    arg2.doFilter(arg0,arg1);
  }
}

通过在springboot的configuration中配置不同的FilterRegistrationBean实例，来注册自定义过滤器

这里创建一个configuration类


import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.example.demo.filter.Test1Filter;
import com.example.demo.filter.Test2Filter;
@Configuration
public class DemoConfiguration {
  @Bean
  public FilterRegistrationBean<Test1Filter> RegistTest1(){
    //通过FilterRegistrationBean实例设置优先级可以生效
    //通过@WebFilter无效
    FilterRegistrationBean<Test1Filter> bean = new FilterRegistrationBean<Test1Filter>();
    bean.setFilter(new Test1Filter());//注册自定义过滤器
    bean.setName("flilter1");//过滤器名称
    bean.addUrlPatterns("/*");//过滤所有路径
    bean.setOrder(1);//优先级，最顶级
    return bean;
  }
  @Bean
  public FilterRegistrationBean<Test2Filter> RegistTest2(){
    //通过FilterRegistrationBean实例设置优先级可以生效
    //通过@WebFilter无效
    FilterRegistrationBean<Test2Filter> bean = new FilterRegistrationBean<Test2Filter>();
    bean.setFilter(new Test2Filter());//注册自定义过滤器
    bean.setName("flilter2");//过滤器名称
    bean.addUrlPatterns("/test/*");//过滤所有路径
    bean.setOrder(6);//优先级，越低越优先
    return bean;
  }
}