springboot 增加过滤器方法

在访问服务器时，我们需要控制用户是否允许权限，这个时候可以使用过滤器。

在springboot 配置过滤器的方法如下：

编写过滤器代码：

package com.neo.filter;

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 javax.servlet.http.HttpServletRequest;
public class MyFilter implements Filter {

    @Override
    public void destroy() {
    }

    @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 {
    }

}

编写加载过滤器代码：

package com.neo.conf;

import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import com.neo.filter.MyFilter;
import com.neo.filter.MyFilter2;

@Configuration
public class WebConfiguration {
    
    @Bean
    public FilterRegistrationBean registerFilter() {

        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setFilter(new MyFilter());
        registration.addUrlPatterns("/*");
        registration.addInitParameter("paramName", "paramValue");
        registration.setName("MyFilter");
        registration.setOrder(1);
        return registration;
    }

    
    @Bean
    public FilterRegistrationBean registerFilter2() {

        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setFilter(new MyFilter2());
        registration.addUrlPatterns("/*");
        registration.addInitParameter("paramName", "paramValue");
        registration.setName("MyFilter2");
        registration.setOrder(2);
        return registration;
    }
}

这里我们看到我们注册了两个过滤器，过滤器的执行顺序通过setOrder确定。